The event was held on June 1st and finished on June 2nd. At the time of posting this there were 106 Museum Ships (including memorials) on the list. For more info on the event check out: https://www.nj2bb.org/museum/ .
In Kingston we were fortunate enough to have the SS Keewatin berthed at the Great Lakes Museumand so for this event it was a 45 min bus ride with all the radio gear I needed to participate.
Here is a couple of pics I took while at the museum.
The gear I used for operating from alongside the Keewatin was my POTA Station that consisted of my Yaesu FT891, Eco-Worthy 20ah LIPO 4 battery and a MFJ 33 foot telescopic mast to support the home brewed 63 Foot End Fed Half Wave (10m to 40m) antenna.
It looks rather small compared to the size of the Keewatin… Thanks to the Taxi Driver who moved into the pic so I could show the size of the ship easier. No I did not use the taxi… Kingston Transit bus #3 stops right at the front door of the Museum.
All my gear fit in my wife’s laundry cart… She may never get it back now…
I used some bungy cords to secure the mast (right of the pic) to a fence behind the tree cover. It suspended the EFHW in a “inverted Vee” configuration and worked well for me with no tuner needed.
I was able to operate for about 3 hours (or less) each day. The gear worked without a hitch but not so much the operator.
As the radio room in the Keewatin has not been updated yet, I was forced to operate from alongside (the above pic) so I was unable to leave the gear to use the facilities and so once nature called… it was time to pack up.
At the end of the event according to my logs I actually was contacted by 100 stations that were “Welcomed on Board the Keewatin”… of those 100 contacts 12 of them were other Museum Ship and their details follow.
(Pictures above the name of the ship)
Col James M Schoonmaker
USS Lafferty
USS Thresher Memorial
USS Massachusetts
Tall Ship Elissa
USS Nautilus
Claud W Somers
USS North Carolina
Watson Naval Museum
USS Salem
USS Cobia
This was a “spur of the moment” style of activation. I was going past the ship a week before and then found out the Museum Ships event was the next weekend. Although the Keewatin does have a valid Callsign without the radio room ship shape they were not in a position to activate.
I asked if I could do it and was given the green light to operate (using my own personal callsign) from where I did. (alongside but outside the fence)
As the Drydock is part of the Great Lakes Waterfront Trail (POTA CA-6003) some amateurs also got a new park in their logs.
Long story short… The activation was a success…. At least 100 amateurs now know of our ship and the Museum Ship community welcomed the Keewatin and its my hope that next year the ship itself will the on the air.
If we made the contact, thanks again. My logs for the two day event have been uploaded to EQSL, QRZ.com, the Museum Ships Group and will be uploaded to LoTW when they have fixed the security issue. I will also offer a copy of my logs to the Keewatin Radio Operators (see above link) for their records.
The lastest (and largest) addition to the Great Lakes Museum collection in Kingston Ontario is the SS Keewatin.
I took this pic Saturday May 25 just before the Museum opened the exhibit.
Its new home is in the Kingston Drydock which is on the shore of Lake Ontario and its history goes back before Canada’s Confederation.
The above shows the Keewatin in the Drydock over the winter. Thanks to Google Maps and Doug Knutson for the Graphics.
Now on the the Radio Part of this….
This coming weekend is the Museum Ships Weekend event (June 1st and 2nd) and the Keewatin will be on the air for this event and we are in really good company.
SHIPS PARTICIPATING FOR 2024 – 101 Ships
updated 26 May 2024 NAME TYPE OF SHIP LOCATION CALLSIGN
K1USN Watson Museum Braintree, MA K1USN USS Hornet Aircraft Carrier Alameda Point, CA NB6GC USS Midway Aircraft Carrier San Diego, CA NI6IW USS Lexington Aircraft Carrier Corpus Christi, TX W5LEX USS Yorktown Aircraft Carrier Charleston, SC WA4USN ST-695 Angels Gate Army Tugboat San Pedro, CA K6AA USS Montrose Memorial Attack Transport(Haskell Class) Montrose, CO N0P USS Alabama Battleship Mobile, AL KQ4RXA USS Massachusetts Battleship Fall River, MA NE1PL USS New Jersey 8am to 6pm from drydock Battleship, New Jersey NJ2BB USS Missouri Battleship Pearl Harbor, HI KH6BB USS Wisconsin Battleship Norfolk, Virginia N4WIS USS Iowa Battleship San Pedro, CA NI6BB USS North Carolina Battleship Wilmington, NC NI4BK USS Oklahoma Mast Memorial Battleship Mast Memorial, OK WW2OK **HS Georgios Averof Battleship Paleo Faliro, Greece SZ1AB USS Tennessee Museum Battleship Museum Oneida, TN W4BSF SS Col. James M Schoonmaker Bulk Carrier Toledo, OH K8E **SS William A Irvin Bulk Ore Carrier Duluth, MN W0GKP Claud W Somers Chesapeake Bay Skipjack Reedville, VA W4NNK CSS Neuse (Jun 1 only) Civil War – Ironclad Gunboat Kinston, NC KN4RAM MV Iris-Joerg Cargo Ship Wischhafen,Germany DL0MFM MV Cap San Diego Cargo Ship Hamburg,Germany DL0MFH USCG Ingham CG Cutter Key West, FL NR4DL USS Potomac CG Cutter/Pres. Yacht Oakland, CA. NE6JP USS Indianapolis CA-35 Memorial Cruiser Indianapolis, IN WW2IND USS Littlerock Cruiser Buffalo, NY W2PE USS Olympia Cruiser Philadelphia, PA WA3BAT USS Salem Cruiser Quincy, MA N1SLM HMAS Vampire Destroyer Sydney, Australia VK2VMP USS Turner Joy Destroyer Bremerton, WA NS7DD USS Cassin Young Sat only 9am-3pm EST Destroyer Boston, MA WW2DD USS The Sullivans Destroyer Buffalo, NY K2EAG USS Orleck Destroyer Jacksonville, FL K4D USS Laffey Destroyer Charleston, SC NT4HI USS Slater Destroyer Escort Albany, NY WW2DEM USS Stewart Destroyer Escort Galveston, TX N5FKP Evelina M Goulart Fishing Schooner Essex, MA W1E **HMCS Sackville Flower Class Corvette Halifax, Nova Scotia VE0CNM SS Grandcamp Memorial French Liberty Ship Texas City, TX K5BS HDMS Peder Skram Frigate Copenhagen, Denmark OZ1RDN SS Hope Memorial Station Hospital Ship Memorial Chatham, MA W1HNJ Krasin Icebreaker St. Petersburg, Russia R1LK SS Sankt Erik Icebreaker Stockholm, Sweden 8SØHRA **Ernest Lapointe Icebreaker L’islet, Qc, Canada VB2MMQC USCGC Mackinaw WAGB-83(Maritime Museum) Icebreaker, MI W8AGB SS Jeremiah O’Brien Liberty Ship San Francisco, CA K6JOB SS John W Brown Liberty Ship Baltimore, MD K8JWB Amrumbank /Deutsche Bucht Lightship Emden, Germany DF0MF LS Ambrose Lightship East River, NY City, NY W2AQ LS Westhinder III Lightship Antwerp, Belgium ON9BD Borkumriff Lightship Island Borkum, Germany DL0BRF USS LST-325 LST Evansville, IN WW2LST LST-393 LST Muskegon, MI N8LST Chatham Radio/WCC Station Maritime Radio Station Chatham, MA W1WCC SS Selma Merchant ship WWI(Concrete Hull) Galveston, TX W5MSQ **Edwin Fox Museum Merchant Ship Picton, New Zealand ZL2KS USS Lucid Minesweeper Stockton, CA N6MSO HNLMS Abraham Crijnssen Minesweeper Den Helder, NL PA38AC HNMS Mercuur Minesweeper Port of Vlissingen, NL PA6PARE KRS 575 “Hans Beimler” Missile Corvette Peenemuende, Germany DL0MFN Farragut Nav Training Sta.Brig Naval Training Station Athol, ID N7F NS Savannah Nuclear Merchant Vessel Baltimore, MD K3SAV SS Hohentwiel Paddle Steamer Bodensee, Austria OE6XMF/9 RMS Queen Mary Passenger Ship Long Beach, CA W6RO SS Rotterdam Passenger Ship Port of Rotterdam PI4HAL
SS Keewatin Passenger Steamship Kingston, ON VA3QV
HMAS Gladstone Patrol Boat(Fremantle Class) Gladstone QLD, VK4GLA **USS Pueblo Memorial Research Ship Pueblo, CO N0K MK1 PBR #105 River Patrol Boat Charleston, SC WD4PBR PB Niederoesterreich (Jun 2 only) River Patrol Boat Danube/Vienna, OE3XNO Tall Ship Elissa Sailing Barque Galveston Island, TX N5E MS Seefalke Salvage Tug Bremerhaven,Germany DK100DDSR USS Ticonderoga (1814) Schooner Whitehall, NY W2C USS Cod Submarine Cleveland, OH W8COD USS Cobia Submarine Manitowoc, Wisconsin NB9QV USS Blueback Submarine Portland, OR W7SUB USS Drum Submarine Mobile, Alabama K4DSR USS Razorback Submarine N.Little Rock AR N5R USS Nautilus Submarine Groton, CT N1S U-995 Submarine Laboe Germany DL0DMB USS Croaker Submarine Buffalo, NY N3ARB USS Albacore Submarine Portsmouth, NH NM1JY Flore Submarine Lorient, France TM2FLO HMCS Onondaga Submarine Pointe-au-Père, Quebec VA2GNQ Nazario Sauro Submarine Genoa, Italy II1NS S-61 Delfin Submarine Torrevieja Spain EH5DLF USS Batfish Submarine Muskogee, OK WW2SUB USS Pampanito Submarine San Francisco, CA NJ6VT USS Cavalla Submarine Galveston, TX N5FKP USS Silversides Submarine Muskegon, MI N8SUB H. L. Hunley Submarine – Civil War Charleston, SC N4HLH Novosibirskij Komsomolec (B-396) Submarine 641-B Moscow, Russia RU3AWK USS Thresher Memorial Submarine Memorial Kittery, ME W1WQM USS Parche Memorial Submarine Memorial Bremerton, WA N7P **”The Fin Project” Submarine Fin Memorial Seattle, WA NR7WL **CSS Acadia Survey Vessel Halifax Nova Scotia VE0MMA USS Hoga YT-146 Tugboat N. Little Rock, AR N5H USAT LT-5 Tugboat/Cargo Transport Oswego, NY W2LGA SS American Victory Victory Ship Tampa, FL W4AVM Red Oak Victory Victory Ship Richmond, CA K6YVM
And as you can see we will be in pretty impressive company…
Now the only issue with this (the first) activation of the new museum ship is that the passenger areas of the ship are open to the public but the Radio Operators Room is still waiting for some period equipment to be set up as a display. So until that is done we can’t install as we don’t know how much room there will be for the “modern” equipment.
So for this event I will be operating from “alongside” the ship (see below pic)
The Radio I use for this event will be my POTA Station gear which is a Yaesu FT891 along with a 40m (64:1 unun) EFHW supported by a 33 foot MFJ Telescopic mast. Backup antenna will be a 17.5 foot vertical (using same mast) fed by a 9:1 unun with a single raised counterpoise.
The operating plan is to be operating from the “American General” parts of the different bands. Hoping that 20m and 40m will be good for us but we have the equipment to operate from 6m to 40m
I hope to start operating at 1300 (UTC) and run till the 20ah battery dies out ( or darkness arrives) on both days.
Will be operating as VA3QV and will uploading logs to LoTW, EQSL and QRZ.com.
The lastest (and largest) addition to the Great Lakes Museum collection in Kingston Ontario is the SS Keewatin.
I took this pic Saturday May 25 just before the Museum opened the exhibit.
Its new home is in the Kingston Drydock which is on the shore of Lake Ontario and its history goes back before Canada’s Confederation.
The above shows the Keewatin in the Drydock over the winter. Thanks to Google Maps and Doug Knutson for the Graphics.
Now on the the Radio Part of this….
This coming weekend is the Museum Ships Weekend event (June 1st and 2nd) and the Keewatin will be on the air for this event and we are in really good company.
SHIPS PARTICIPATING FOR 2024 – 101 Ships
updated 26 May 2024 NAME TYPE OF SHIP LOCATION CALLSIGN
K1USN Watson Museum Braintree, MA K1USN USS Hornet Aircraft Carrier Alameda Point, CA NB6GC USS Midway Aircraft Carrier San Diego, CA NI6IW USS Lexington Aircraft Carrier Corpus Christi, TX W5LEX USS Yorktown Aircraft Carrier Charleston, SC WA4USN ST-695 Angels Gate Army Tugboat San Pedro, CA K6AA USS Montrose Memorial Attack Transport(Haskell Class) Montrose, CO N0P USS Alabama Battleship Mobile, AL KQ4RXA USS Massachusetts Battleship Fall River, MA NE1PL USS New Jersey 8am to 6pm from drydock Battleship, New Jersey NJ2BB USS Missouri Battleship Pearl Harbor, HI KH6BB USS Wisconsin Battleship Norfolk, Virginia N4WIS USS Iowa Battleship San Pedro, CA NI6BB USS North Carolina Battleship Wilmington, NC NI4BK USS Oklahoma Mast Memorial Battleship Mast Memorial, OK WW2OK **HS Georgios Averof Battleship Paleo Faliro, Greece SZ1AB USS Tennessee Museum Battleship Museum Oneida, TN W4BSF SS Col. James M Schoonmaker Bulk Carrier Toledo, OH K8E **SS William A Irvin Bulk Ore Carrier Duluth, MN W0GKP Claud W Somers Chesapeake Bay Skipjack Reedville, VA W4NNK CSS Neuse (Jun 1 only) Civil War – Ironclad Gunboat Kinston, NC KN4RAM MV Iris-Joerg Cargo Ship Wischhafen,Germany DL0MFM MV Cap San Diego Cargo Ship Hamburg,Germany DL0MFH USCG Ingham CG Cutter Key West, FL NR4DL USS Potomac CG Cutter/Pres. Yacht Oakland, CA. NE6JP USS Indianapolis CA-35 Memorial Cruiser Indianapolis, IN WW2IND USS Littlerock Cruiser Buffalo, NY W2PE USS Olympia Cruiser Philadelphia, PA WA3BAT USS Salem Cruiser Quincy, MA N1SLM HMAS Vampire Destroyer Sydney, Australia VK2VMP USS Turner Joy Destroyer Bremerton, WA NS7DD USS Cassin Young Sat only 9am-3pm EST Destroyer Boston, MA WW2DD USS The Sullivans Destroyer Buffalo, NY K2EAG USS Orleck Destroyer Jacksonville, FL K4D USS Laffey Destroyer Charleston, SC NT4HI USS Slater Destroyer Escort Albany, NY WW2DEM USS Stewart Destroyer Escort Galveston, TX N5FKP Evelina M Goulart Fishing Schooner Essex, MA W1E **HMCS Sackville Flower Class Corvette Halifax, Nova Scotia VE0CNM SS Grandcamp Memorial French Liberty Ship Texas City, TX K5BS HDMS Peder Skram Frigate Copenhagen, Denmark OZ1RDN SS Hope Memorial Station Hospital Ship Memorial Chatham, MA W1HNJ Krasin Icebreaker St. Petersburg, Russia R1LK SS Sankt Erik Icebreaker Stockholm, Sweden 8SØHRA **Ernest Lapointe Icebreaker L’islet, Qc, Canada VB2MMQC USCGC Mackinaw WAGB-83(Maritime Museum) Icebreaker, MI W8AGB SS Jeremiah O’Brien Liberty Ship San Francisco, CA K6JOB SS John W Brown Liberty Ship Baltimore, MD K8JWB Amrumbank /Deutsche Bucht Lightship Emden, Germany DF0MF LS Ambrose Lightship East River, NY City, NY W2AQ LS Westhinder III Lightship Antwerp, Belgium ON9BD Borkumriff Lightship Island Borkum, Germany DL0BRF USS LST-325 LST Evansville, IN WW2LST LST-393 LST Muskegon, MI N8LST Chatham Radio/WCC Station Maritime Radio Station Chatham, MA W1WCC SS Selma Merchant ship WWI(Concrete Hull) Galveston, TX W5MSQ **Edwin Fox Museum Merchant Ship Picton, New Zealand ZL2KS USS Lucid Minesweeper Stockton, CA N6MSO HNLMS Abraham Crijnssen Minesweeper Den Helder, NL PA38AC HNMS Mercuur Minesweeper Port of Vlissingen, NL PA6PARE KRS 575 “Hans Beimler” Missile Corvette Peenemuende, Germany DL0MFN Farragut Nav Training Sta.Brig Naval Training Station Athol, ID N7F NS Savannah Nuclear Merchant Vessel Baltimore, MD K3SAV SS Hohentwiel Paddle Steamer Bodensee, Austria OE6XMF/9 RMS Queen Mary Passenger Ship Long Beach, CA W6RO SS Rotterdam Passenger Ship Port of Rotterdam PI4HAL
SS Keewatin Passenger Steamship Kingston, ON VA3QV
HMAS Gladstone Patrol Boat(Fremantle Class) Gladstone QLD, VK4GLA **USS Pueblo Memorial Research Ship Pueblo, CO N0K MK1 PBR #105 River Patrol Boat Charleston, SC WD4PBR PB Niederoesterreich (Jun 2 only) River Patrol Boat Danube/Vienna, OE3XNO Tall Ship Elissa Sailing Barque Galveston Island, TX N5E MS Seefalke Salvage Tug Bremerhaven,Germany DK100DDSR USS Ticonderoga (1814) Schooner Whitehall, NY W2C USS Cod Submarine Cleveland, OH W8COD USS Cobia Submarine Manitowoc, Wisconsin NB9QV USS Blueback Submarine Portland, OR W7SUB USS Drum Submarine Mobile, Alabama K4DSR USS Razorback Submarine N.Little Rock AR N5R USS Nautilus Submarine Groton, CT N1S U-995 Submarine Laboe Germany DL0DMB USS Croaker Submarine Buffalo, NY N3ARB USS Albacore Submarine Portsmouth, NH NM1JY Flore Submarine Lorient, France TM2FLO HMCS Onondaga Submarine Pointe-au-Père, Quebec VA2GNQ Nazario Sauro Submarine Genoa, Italy II1NS S-61 Delfin Submarine Torrevieja Spain EH5DLF USS Batfish Submarine Muskogee, OK WW2SUB USS Pampanito Submarine San Francisco, CA NJ6VT USS Cavalla Submarine Galveston, TX N5FKP USS Silversides Submarine Muskegon, MI N8SUB H. L. Hunley Submarine – Civil War Charleston, SC N4HLH Novosibirskij Komsomolec (B-396) Submarine 641-B Moscow, Russia RU3AWK USS Thresher Memorial Submarine Memorial Kittery, ME W1WQM USS Parche Memorial Submarine Memorial Bremerton, WA N7P **”The Fin Project” Submarine Fin Memorial Seattle, WA NR7WL **CSS Acadia Survey Vessel Halifax Nova Scotia VE0MMA USS Hoga YT-146 Tugboat N. Little Rock, AR N5H USAT LT-5 Tugboat/Cargo Transport Oswego, NY W2LGA SS American Victory Victory Ship Tampa, FL W4AVM Red Oak Victory Victory Ship Richmond, CA K6YVM
And as you can see we will be in pretty impressive company…
Now the only issue with this (the first) activation of the new museum ship is that the passenger areas of the ship are open to the public but the Radio Operators Room is still waiting for some period equipment to be set up as a display. So until that is done we can’t install as we don’t know how much room there will be for the “modern” equipment.
So for this event I will be operating from “alongside” the ship (see below pic)
The Radio I use for this event will be my POTA Station gear which is a Yaesu FT891 along with a 40m (64:1 unun) EFHW supported by a 33 foot MFJ Telescopic mast. Backup antenna will be a 17.5 foot vertical (using same mast) fed by a 9:1 unun with a single raised counterpoise.
The operating plan is to be operating from the “American General” parts of the different bands. Hoping that 20m and 40m will be good for us but we have the equipment to operate from 6m to 40m
I hope to start operating at 1300 (UTC) and run till the 20ah battery dies out ( or darkness arrives) on both days.
Will be operating as VA3QV and will uploading logs to LoTW, EQSL and QRZ.com.
Anyone who has been with me for awhile knows that every now and again “Murphy” of Murphy’s Law fame comes for a visit.
Things here have been going fairly well (Ham Radio wise) recently. I have been able to some contacts (mostly 20m SSB) during the daytime and also in the evenings (mostly 40m SSB) and considering the band conditions I think that’s pretty good.
But (and you know there had to be a “but”!
After making some evening 40m ssb contacts last night I shut off the power supply and left the shack. I came back to the shack and turned on the power supply and the radio would not turn on.
I did a quick check and the power supply now had an output of 4v dc. Not what I was expecting as before I shut it down it was steady at 13.5v dc which is normal for this unit.
I then took the cover off and could not smell the “magic smoke” and there was no visible issues on the board itself. No burn marks on the board, everything attached and no signs of any thing out of the ordinary.
I did have a backup PS so I’m still on the air with a 25 amp unit rather than the 30 amp unit that now is a paperweight.
The replacement from “The Toronto Toystore” will set me back around $220.00 after shipping/taxes, so it won’t break the bank and they have one in stock so “fingers crossed”.
So, this morning I look out into my backyard and notice the counterweight attached to the end of my “Stealthy Inverted L” is laying on the ground. A quick check found that the wire itself was intact but…. (yup but again) the wire had slipped off on of the branches that support the horizontal section of the wire. This does happen every now and again so…. 30 minutes later I’m back on the air.
The plan now is to see if the band comes to life (the numbers are looking good) and I can get (more than) a few contacts in the log.
.
Ending on a positive note I was able to contact VE3FI Bill as he activated POTA CA-2376 as part of his cross Canada tour. I guess the antenna is working after all that.
Anyone who has been with me for awhile knows that every now and again “Murphy” of Murphy’s Law fame comes for a visit.
Things here have been going fairly well (Ham Radio wise) recently. I have been able to some contacts (mostly 20m SSB) during the daytime and also in the evenings (mostly 40m SSB) and considering the band conditions I think that’s pretty good.
But (and you know there had to be a “but”!
After making some evening 40m ssb contacts last night I shut off the power supply and left the shack. I came back to the shack and turned on the power supply and the radio would not turn on.
I did a quick check and the power supply now had an output of 4v dc. Not what I was expecting as before I shut it down it was steady at 13.5v dc which is normal for this unit.
I then took the cover off and could not smell the “magic smoke” and there was no visible issues on the board itself. No burn marks on the board, everything attached and no signs of any thing out of the ordinary.
I did have a backup PS so I’m still on the air with a 25 amp unit rather than the 30 amp unit that now is a paperweight.
The replacement from “The Toronto Toystore” will set me back around $220.00 after shipping/taxes, so it won’t break the bank and they have one in stock so “fingers crossed”.
So, this morning I look out into my backyard and notice the counterweight attached to the end of my “Stealthy Inverted L” is laying on the ground. A quick check found that the wire itself was intact but…. (yup but again) the wire had slipped off on of the branches that support the horizontal section of the wire. This does happen every now and again so…. 30 minutes later I’m back on the air.
The plan now is to see if the band comes to life (the numbers are looking good) and I can get (more than) a few contacts in the log.
.
Ending on a positive note I was able to contact VE3FI Bill as he activated POTA CA-2376 as part of his cross Canada tour. I guess the antenna is working after all that.
Well its not as bad as indicated from my last post…
But its still got a way to go…
This morning on my 11 am (Eastern) hour on the TPN I managed to get 7 stations in my log which is the best its been in a while. After the net ended I had some household chores to do before I could get to the next part of this post.
Today I wanted to take my Yaesu FT891 rig along with my two antennas out into my backyard and make sure everything is still working as well as I remember. Next week my shifts on the TPN will be ending for a while as I am taking the summer off in an attempt to concentrate on my POTA part of the hobby.
So here’s the setup
Rig: Yaesu FT891 powered by my ECO-Worthy 20ah LI-PO4 battery
Antenna 1: 40m EFHW which is 63 feet long and fed by a 64:1 unun. This antenna usually is used in a sloper or inverted Vee configuration. Its very nice on 10-40m and I have 2 small counterpoises which I clip on as needed. I feed the unun from a 25 foot run of RG58 with a RF choke at one end.
Antenna 2: 17.5 foot long end fed fed by a 9:1 unun. I normally would use this in a vertical or sloper configuration. Its excellent on 10m to 20m but will also work on 40m without the need of a tuner. Depending on the situation I have a couple of small counterpoises I can clip onto the unn if needed. I feed the unun from a 25 foot run of RG58 with a RF choke at one end. The advantage to this antenna is that if I use it as a vertical there is next to no footprint which could make a couple of the parks in the downtown area much easier to activate.
If the trees do not cooperate I also carry a MFJ 33 foot telescopic masting which will support the wire if needed.
How did I do today?
Operating from my deck I strung out the 63 foot EFHW kind of as an inverted xyz configuration. Hanging 63 feet of wire anywhere I could hand it without anyone seeing it or running into it. Despite the setup Contacts were made on 40m and 20m despite the band conditions. with a reasonable SWR (no tuner in line) where I normally use it
Next I used the 17.5 with the 9:1 unun as a low sloper and made 1 contact on 20. The SWR was “tolerable” on 40m but on 10m to 20m it was under 2:1 which is great for a Portable setup. Nothing to complain about on my part.
I also use this style of antenna at home in a vertical configuration and it works great for my need either “home or away”
So here’s the plan…
If you notice the above map there are 10 POTA sites (yellow dots) that I can easily access from my home in Kingston. All of them easily reachable via public transit or a bit of a walk. The one on the bottom right (the island) is not reachable via foot. There is a dock but I can’t find out if Kingston has a Water Taxi so if I can activate 10 out of 11 I will be pleased.
I guess I could also say that this would be a test of the station I will be using for Field Day this year. Not sure where I’m going to be yet but…. I know I’ll be participating from somewhere near Kingston.
Well its not as bad as indicated from my last post…
But its still got a way to go…
This morning on my 11 am (Eastern) hour on the TPN I managed to get 7 stations in my log which is the best its been in a while. After the net ended I had some household chores to do before I could get to the next part of this post.
Today I wanted to take my Yaesu FT891 rig along with my two antennas out into my backyard and make sure everything is still working as well as I remember. Next week my shifts on the TPN will be ending for a while as I am taking the summer off in an attempt to concentrate on my POTA part of the hobby.
So here’s the setup
Rig: Yaesu FT891 powered by my ECO-Worthy 20ah LI-PO4 battery
Antenna 1: 40m EFHW which is 63 feet long and fed by a 64:1 unun. This antenna usually is used in a sloper or inverted Vee configuration. Its very nice on 10-40m and I have 2 small counterpoises which I clip on as needed. I feed the unun from a 25 foot run of RG58 with a RF choke at one end.
Antenna 2: 17.5 foot long end fed fed by a 9:1 unun. I normally would use this in a vertical or sloper configuration. Its excellent on 10m to 20m but will also work on 40m without the need of a tuner. Depending on the situation I have a couple of small counterpoises I can clip onto the unn if needed. I feed the unun from a 25 foot run of RG58 with a RF choke at one end. The advantage to this antenna is that if I use it as a vertical there is next to no footprint which could make a couple of the parks in the downtown area much easier to activate.
If the trees do not cooperate I also carry a MFJ 33 foot telescopic masting which will support the wire if needed.
How did I do today?
Operating from my deck I strung out the 63 foot EFHW kind of as an inverted xyz configuration. Hanging 63 feet of wire anywhere I could hand it without anyone seeing it or running into it. Despite the setup Contacts were made on 40m and 20m despite the band conditions. with a reasonable SWR (no tuner in line) where I normally use it
Next I used the 17.5 with the 9:1 unun as a low sloper and made 1 contact on 20. The SWR was “tolerable” on 40m but on 10m to 20m it was under 2:1 which is great for a Portable setup. Nothing to complain about on my part.
I also use this style of antenna at home in a vertical configuration and it works great for my need either “home or away”
So here’s the plan…
If you notice the above map there are 10 POTA sites (yellow dots) that I can easily access from my home in Kingston. All of them easily reachable via public transit or a bit of a walk. The one on the bottom right (the island) is not reachable via foot. There is a dock but I can’t find out if Kingston has a Water Taxi so if I can activate 10 out of 11 I will be pleased.
I guess I could also say that this would be a test of the station I will be using for Field Day this year. Not sure where I’m going to be yet but…. I know I’ll be participating from somewhere near Kingston.
It’s a POTA road trip! I head out to activate three new to me parks while using a different antenna at each one. Ride along with me for an epic Parks on the Air activation as we find out which one will be the best
As a bonus, patrons can view the full, unedited phone contacts for this Parks on the Air activation. Visit my page on Patreon for details: https://www.patreon.com/kb9vbrantennas
I do return QSL, if you made a contact with me and would like a QSL, please send me one. Return postage not necessary, but always appreciated. As they say, KB9VBR is ‘good in the book.
If you were checking the Trans Provincial Net Website you might of noticed a small blurb mentioning I will be taking the summer off.
“Bob VA3QV will be away starting 18th May till September 2024.”
I currently cover the 11am (EST) hour 5 days a week and I do enjoy being a NCS…. But… Now that the nicer weather is finally looking like it might arrive… I decided I would prefer to spend it doing other stuff compared to sitting in the shack for a while.
No doubt that radio will be a big part of my summer but it won’t be from the shack unless its raining.
As always if I am doing (or have done) anything interesting in radio you will be able to read about it right here.
Those of you who’ve been following my field reports for a few years might have noticed something different: I haven’t been activating some of my favorite POTA sites as often. Here’s the reason why, and how I’m working to get back on the air at these special locations: Most notably: Lake James SP (US-2739), South … Continue reading Caregiving and QSOs: Returning to a Favorite POTA Site→
In this article, unless stated otherwise, reference to |s11| and ReturnLoss are to those quantities expressed in dB. Note that |s11|=-40dB is less than |s11|=-20dB. ReturnLoss and |s11| are related, ReturnLoss=‑|s11|.
Measurement 1
As a basis for discussion, let me offer an example measurement.
Above is a scan of a certain DUT after SOLT calibration of the NanoVNA.
Note:
the extremely low value of |s11|, quite jittery but averaging around -85dB;
reported impedance is very very close to 50+j0Ω; and
the reported |s11| and Z at the marker reconcile (making allowance for rounding errors) when Zref is taken as 50+j0Ω.
Experienced practitioners will recognise that the most likely way to measure extremely low |s11| like this is that the DUT is the calibration LOAD component, or one that is of same value within a tolerance of 1 part in 10,000 or 0.01%. In fact, the DUT is the LOAD, let’s call it LOAD1 for reference.
But… there is a serious problem.
Measurement 2
Let’s calibrate again using another LOAD, call it LOAD2 for reference.
Above, a new measurement of the same DUT being LOAD1.
Note:
the low value of |s11|, averaging around -29dB;
reported impedance is very very close to 47+j1.6Ω; and
the reported |s11| and Z at the marker reconcile (making allowance for rounding errors) when Zref is taken as 50+j0Ω.
Analysis of the problem
Stand alone, both displays look consistent, there is not an obvious problem. The reason I could say there was a problem is information that has not yet been presented.
DC resistance of the loads (measured using an instrument with uncertainty of 25mΩ):
LOAD1=47.05; and
LOAD2=49.81.
For most good loads, the DC resistance is a very good indicator of VSWR at low frequencies (the exception is loads with a DC block).
The implied value of VSWR wrt Zref=50+j0Ω is:
LOAD1: VSWR=1.07 (ReturnLoss=29.24dB); and
LOAD2: VSWR=1.004 (ReturnLoss=54.41dB).
So, LOAD1 is a bit shabby, whereas LOAD2 looks quite good.
The insidious thing is that for measurement of many DUT, it might not be apparent that calibration based on LOAD1 is poor. Of course for DUT with high ReturnLoss50, the error will be relatively small and will probably not matter, but for lower ReturnLoss50, the error may be significant.
The next part will offer a practical method of approximately quantifying the uncertainty in ReturnLoss.
Conclusions
Without knowledge of the characteristics of the LOAD used for calibration, the measurements of themselves are of little value.
Even if the SHORT, OPEN, LOAD calibration parts are known in theory, poor application (eg dirty connectors, connectors not adequately tightened, unusual temperature of equipment, aging, damage) can result in degraded uncertainty.
Several articles on this site use the following technique for measurement of transformer performance, and the question arises, how accurate does the load need to be?
Let’s set some limits on the range of ReturnLoss of interest. Measured ReturnLoss is limited by the instrument, and in the case of a VNA, its noise floor and the accuracy of the calibration parts used are the most common practical limits. That said, in practical DUT like an EFHW transformer, would would typically be interested in measuring ReturnLoss between say 10 and 32dB (equivalent to VSWR=1.05) with error less than say 3dB.
There are many contributions to error, and one of the largest is often the choice of transformer load resistor. This article explores that contribution alone.
2% load error
Let’s say the load resistor used is 2% high, 2450+2%=2499Ω. To measure ReturnLoss with such a resistor is to imply that the transformer is nominally \(\frac{Z_{pri}}{Z_{sec}}=\frac{51}{2499}\) and ReturnLoss should be measured wrt reference impedance 51Ω.
To measure ReturnLoss wrt 50Ω gives rise to error.
Above is a chart of calculated ReturnLoss wrt Zref=51 (the actual ReturnLoss) and Zref=50 (the indicated ReturnLoss) for a range of load resistances, and the error in assuming RL50 when RL51 is the relevant measure.
For example, if Rload=48.5Ω, RL51=32.00dB whereas RL50 (which would be indicated on a VNA calibrated for Zref=50) is 36.35dB, and error of +4.35dB which falls outside our 3dB limit stated earlier… so this load resistance is incompatible with the stated measurement criteria.
1% load error
Let’s say the load resistor used is 1% high, 2450+1%=2475Ω. To measure ReturnLoss with such a resistor is to imply that the transformer is nominally \(\frac{Z_{pri}}{Z_{sec}}=\frac{50.5}{2475}\) and ReturnLoss should be measured wrt reference impedance 50.5Ω.
To measure ReturnLoss wrt 50Ω gives rise to error.
Above is a chart of calculated ReturnLoss wrt Zref=50.5 (the actual ReturnLoss) and Zref=50 (the indicated ReturnLoss) for a range of load resistances, and the error in assuming RL50 when RL50.5 is the relevant measure.
To take the same example, if Rload=48.5Ω, RL50.5=33.89dB whereas RL50 (which would be indicated on a VNA calibrated for Zref=50) is 36.35dB, and error of +2.45dB which falls within our 3dB limit stated earlier… so this load resistance is compatible with the stated measurement criteria.
Is there a simpler way?
Let’s review the meaning of directional coupler Directivity.
Above is a diagram from Mini-circuits.
An important property of a directional coupler is its Directivity, \(Directivity=10 \log \frac{P3}{P4}\).
If we take a directional coupler that is perfectly calibrated for Zref=50+j0Ω and use it to measure a perfect load of \(\frac{2450+0.1\%}{49}=50.05 \text{ Ω}\) we will measure ReturnLoss that equates to the Directivity of that coupler.
Above is a calculation of the ReturnLoss wrt 50+j0Ω of a load of 50.05+j0Ω. ReturnLoss is 66.03dB, so Directivity of the coupler used in this way is 66.03dB.
Above is a calculation of the uncertainty and confidence limits of a measurement of ReturnLoss indicating 55dB using this directional coupler with Zref=50+j0Ω when the measurement context is actually Zref=50.05+j00Ω. When the indicated ReturnLoss is 55dB, the actual ReturnLoss wrt Zref=50.05+j0 is between 52.8 and 57.9dB, of 55 +2.86/-2.15.
So, a more accurate load resistor allows measurement to greater ReturnLoss within the discussed confidence limits.
Conclusions
The accuracy of the secondary side load when measuring ReturnLoss (and related parameters like InsertionVSWR) is important.
The transformer should usually be loaded with a resistance of turns^2 * 50Ω.
A resistance accuracy of 1% in that resistance is sufficient to sustain most bench measurements of a practical EFHW transformer and field measurement with an antenna attached.
If you look back to my previous post in which I had covered my successful POTA activation of CA5143 I mentioned that I had used my 40m EFHW antenna to make the 23 contacts made.
Well one thing I neglected to mention was the difficulty I had getting 62 feet (or so) wire stretched out in the rather dense brush just off the trail. In the past I had mentioned about getting a 2nd antenna in the kit for when the EFHW was just not able to be deployed easily.
I had tried a BuddiPole but it did not (could not) do exactly what I wanted…. Using some parts from the BuddiPole and then adding a “Imitation” Shock Corded 9 foot whip (In my opinion…FWIW the Amazoon 9.5 ft shock cord whip is a real POS)was not doing it for me either. I tried following the instructions and when those did not work I tried (to no avail) to use what I tried in the past with other portable antennas but just no joy…
Fast forward to yesterday. The LDG 9:1 UNUN that I ordered on the Monday had arrived and so I decided to duplicate the “Coastal-20” antenna that I use at home for 10-12-15-17 & 20m. If you “Google Coastal-20 you should see the basic plans. Its a 9:1 UNUN along with a 17.5 foot vertical with a short counterpoise.
Now on my first build I found the short counterpoise version did not perform exactly as I had hoped so I decided to go with 3 elevated counterpoises. I cut 1 for 10-15 &20m and it worked quite well for me on 10 to 20m. By well I mean that I was making contacts and the SWR on all the needed bands was low or low enough that the internal tuner in my Yaesu FT991a was handling it.
Mostly copying my first version with the exception of swapping out 3 counterpoises for a single 11 foot counterpoise seemed to make no difference with the SWR and it was loading up just as well as the previous one did.
The next test for the new antenna will be when I get out into the Park (hopefully this weekend) if the forecasted rain ever stops. The plan is to have both antennas available for when I participate in the POTA Support your Parks event which happens April 20th and 21st and by strange luck is also the same weekend as the Ontario QSO Party, The Michigan QSO Party and the Quebec QSO Party so there should be no problems getting contacts to activate what ever park (parks) I head out to…
Sometimes, we do things for the pure nostalgia of it all! I mentioned in a previous post that I recently acquired a circa 1995 Index Labs QRP Plus transceiver. Being transparent here, this was an impulse purchase fueled by pure, unadulterated nostalgia. The QRP Plus was the first QRP transceiver that I’d ever laid my … Continue reading My first POTA Activation with the Index Labs QRP Plus Field Transceiver→
An online expert talking about compensation capacitors and EFHW ferrite cored transformers opined:
If the evaluation is done solely by the effect on measured SWR, whether it is measured with a standard reflectometer or a VNA, then it is just as likely the capacitor is changing the losses in the transformer rather than actually adjusting the match.
“Just as likely” + gobbledygook, is this just hand waving on social media?
Above is the SimNEC model as calibrated to bench measurement of a prototype transformer. The compensation capacitor Ccomp is specified as 100pF with Q=1000 (reasonable for a silver mica capacitor that is well suited to the application).
Above is a zoomed in view of the chart, the dashed magenta line is the power passing right to left before the compensation cap, and blue is the power passing right to left after the compensation cap. The blue dashed line is mostly under the magenta dashed line, ie there is negligible reduction in power caused by the compensation cap.
With a suitable capacitor, capacitor loss @ 25MHz (the design limit for the transformer) is 0.11W, much less than core loss which is 3.2W.
Let’s reduce the Q of Ccomp to 100 representative of a low grade ceramic cap.
Above is a zoomed in view of the chart, the dashed magenta line is the power passing right to left before the compensation cap, and dashed blue is the power passing right to left after the compensation cap.
Now we can see the dashed blue line separate above about 15MHz, though the difference in power is very small even to 25Hz (the design limit for the transformer) where for 100W from the transmitter, less than 1.1W is dissipated in Ccomp (though that probably exceeds its power handling capacity).
Whilst I do recommend a good capacitor such as silver mica be used for this application, I note lots of published pictures use ceramic capacitors and their Q may range widely. It is misguided to select a 6kV ceramic capacitor, the voltage withstand is not needed and they often have Q below 200.
To the opening quote and my question: “Just as likely”, is this just hand waving on social media? Sound design should prevent that occurring, this does look like social chat without evidence to support assertions.
An online expert discussing broadband RF transformers recently opined “… if you measure k, the correlation of k and performance is excellent” whatever “performance” means.
Presumably he means k as in the flux coupling coefficient of two flux coupled inductors, ie inductors with mutual inductance (meaning changing current in one inductor induces an EMF in the other inductor). k is the proportion of flux due to current in one inductor that cuts the turns of the other inductor, it is usually stated pu (per unit) but sometimes in % (per cent or per 100).
A common metric for the performance of a broadband transformer is its InsertionVSWR. Other factors might be considered, but InsertionVSWR is commonly most ranked. Note that to describe a transformer as 1:49 implicitly invokes InsertionVSWR as a measure of its performance.
One of the enemies of broadband performance is flux leakage, k less than unity. The equivalent leakage reactance is usually the main contirubutor to high frequency roll off (an increase in InsertionVSWR at high frequencies) in good designs.
This is a good 1:49 transformer (see the referenced article) with low InsertionVSWR (<1.5) from below 2MHz to 25MHz.
Study the k line, does it jump out as a performance indicator? Is there an apparent “correlation of k and performance?”
k needs to be very close to unity for a good broadband transformer. In fact, it is more revealing to examine the departure of k from unity, ie to plot 1-k (dashed magenta line).
Some things to note:
1-k is clearly frequency dependent in this model (and of course so is k, but less so);
whilst leakage reactance is the main contributor to high frequency roll off, and k is one of the influences on leakage reactance, the relationship is not a simple one trivial (ie there is no obvious correlation between the roll off of InsertionVSWR at high or low end of the chart above.
Conclusions
k is an important design parameter for broadband ferrite cored RF transformers, but there is not a simple and strong correlation between k and InsertionVSWR.
This was a special one for me. The last I tried to activate the Marshlands Conservation Area I had an equipment malfunction and as such it was a “Failed Activation”.
Today I headed out to get the one that got away.
I set up (red dot on the map) and operated with my FT891 set at 30w , 40m EFHF and proceeded to give out contacts….
In one hour I had managed to make 23 contacts in Ontario, and the Eastern Parts of the USA.
In the “learning part” of my activation I still have to find a way to carry more stuff and also make the kit lighter… It was a 4 km walk there and back (thats almost 2.5 miles to those of you south of the border) and to be honest I was really glad to get home and get my feet up.
I mentioned a few posts back about using some sort of trailer to carry the kit and today’s effort reinforces that thought….
Anyway I did have fun…. and if I worked you I hope you had fun as well….. If you don’t see our QSO today in your Hunters Log let me know and I’ll try to figure out why not…
Watch me, in real time, as I deploy an end fed half wave antenna, set up my station on a picnic table, and do a QRP (5 watt) POTA activation on the 15 meter band.
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