People who know me have heard me say that after all these years there are 3 radios I have sold that I actually regret selling. Well now there are only 2 radios that I regret sellingβ¦
.
Welcome the Xiegu X5105 back into my portable shackβ¦
.
Between my FT991a and my FT891 there was a bit of a gap. The Yeasu FT891 Portable Station was a bit too heavy for my old bones. I needed something in a lighter backpack to make it easier to carry if I was to choose to activate one of the local POTA Parks here in Kingston.
The above pic shows my old X5105 with the Bandspringer attached
The Xiegu X5105 fills that gap. With the built in battery pack, the built in automatic antenna tuner along with the contest keyer and the built in CW Decoder it makes it a dream portable station.
My antennas are a 40m EFHW made with 28ga wire and a QRP AMAZON 49:1 unun. I also can use a 29foot end fed random wire using a QRP EARCHI 9:1 unun.
I also have the SOTABeams Bandspringer antenna that plugs right into the antenna input and uses the built in tuner to operate between 10m and 60m.
So whatβs the other two radios you might ask?
Above is my first QRP setup. FT817, LDG QRP Autotuner.
If I could work a deal for a Yaesu FT817 and a Flex 1500 it would complete the list. However used rigs are pricy and it seems most hams think that radios seem to appreciate with age so like I mentioned above it has to be a good deal for both the seller and myself.
People who know me have heard me say that after all these years there are 3 radios I have sold that I actually regret selling. Well now there are only 2 radios that I regret sellingβ¦
.
Welcome the Xiegu X5105 back into my portable shackβ¦
.
Between my FT991a and my FT891 there was a bit of a gap. The Yeasu FT891 Portable Station was a bit too heavy for my old bones. I needed something in a lighter backpack to make it easier to carry if I was to choose to activate one of the local POTA Parks here in Kingston.
The above pic shows my old X5105 with the Bandspringer attached
The Xiegu X5105 fills that gap. With the built in battery pack, the built in automatic antenna tuner along with the contest keyer and the built in CW Decoder it makes it a dream portable station.
My antennas are a 40m EFHW made with 28ga wire and a QRP AMAZON 49:1 unun. I also can use a 29foot end fed random wire using a QRP EARCHI 9:1 unun.
I also have the SOTABeams Bandspringer antenna that plugs right into the antenna input and uses the built in tuner to operate between 10m and 60m.
So whatβs the other two radios you might ask?
Above is my first QRP setup. FT817, LDG QRP Autotuner.
If I could work a deal for a Yaesu FT817 and a Flex 1500 it would complete the list. However used rigs are pricy and it seems most hams think that radios seem to appreciate with age so like I mentioned above it has to be a good deal for both the seller and myself.
Well its not as bad as indicated from my last postβ¦
But its still got a way to goβ¦
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 hereβs 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 βtolerableβ 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 βhome or awayβ
So hereβs the planβ¦
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 canβt 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 Iβm going to be yet butβ¦. I know Iβll be participating from somewhere near Kingston.
Well its not as bad as indicated from my last postβ¦
But its still got a way to goβ¦
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 hereβs 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 βtolerableβ 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 βhome or awayβ
So hereβs the planβ¦
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 canβt 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 Iβm going to be yet butβ¦. I know Iβll be participating from somewhere near Kingston.
If you were checking the Trans Provincial Net Website you might of noticed a small blurb mentioning I will be taking the summer off.
βBob VA3QV will be away starting 18th May tillΒ September 2024.β
I currently cover the 11am (EST) hour 5 days a week and I do enjoy being a NCSβ¦. Butβ¦ Now that the nicer weather is finally looking like it might arriveβ¦ 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 wonβt 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.
This antenna modelling session came about after a conversation with Michael, DK1MI on the Matrix. I believe the antenna design was originally done by Artur, M0PLK with reviews being on EHAM.
The antenna takes the form of a simple inverted triangular loop with a 5.8m flat top and two diagonals each 5.6m long coming down to a point. The antenna is fed in the centre of the flat top with 450 Ohm open ladder line and a 4:1 Balun. This antenna will require an ATU on all bands as the modelling shows a very wide range of impedances at the feed point.
Multi-Band Delta Loop Antenna View
The design seems to suggest using two fixed aluminium tubes with the wire fed up through them for the two diagonal elements of the antenna however, it would probably be easier to use a pair of collapsable fibre glass poles (Not Carbon fibre) with the wire attached via some clips or tape.
I decided to model the antenna with the top horizontal wire 10m above ground putting the point of the triangle 5.2m above ground. I felt this was an achievable height for most HAMs. Lowering the antenna will raise the resultant angle of maximum radiation on all bands.
Looking at the 2D Far Field Plots (2DFFP) the antenna radiates through the loop as expected with a higher radiation angle on the lowest band and the lowest radiation angle on the highest band. The antenna is of course bi-directional and so could be rotated just 180 degrees to obtain global coverage.
On the 30m band the antenna has a very high angle of maximum radiation making it ideal for short distances. There is a little gain to be had at 25 degrees however, this is nowhere near the maximum but, will possibly aid working longer distances. A maximum gain of 5.31dBi is obtained at 72 Degrees on the 30m band.
Multi-Band Delta Loop Antenna 30m 2D Far Field Plot
On the 20m band the 2DFFP is fairly similar to that of the 30m band but, with 5.57dBi gain at a lower angle of 34 Degrees. This will provide excellent results on medium distance contacts and reasonable results on the long haul.
Multi-Band Delta Loop Antenna 20m 2D Far Field Plot
Once above 14Mhz things start to get more interesting. From the 17m band upwards the radiation pattern changes quite drastically and starts to provide some excellent gain at relatively low angles. This will improve the antennaβs DX performance considerably on the higher bands.
Looking at the 17m band the angle of maximum radiation is now down to 26 degrees with a gain of 7.64dBi. At 12 degrees there is a gain of 4.59dBi. This radiation pattern will make this antenna ideal for the medium to long haul contact with very little interference from NVIS signals.
Multi-Band Delta Loop Antenna 17m 2D Far Field Plot
The 15m band follows the trend with the angle of max radiation now down to 22 degrees with a max gain of 8.54dBi. Even at 10 degrees there is a gain of 5.34dBi which will be very welcome for DXing. There is slightly more near vertical incident skywave (NVIS) radiation on the 15m band and so the antenna should provide short, medium and long haul contacts with the latter being favoured.
Multi-Band Delta Loop Antenna 15m 2D Far Field Plot
Moving up to the 12m band the angle of maximum radiation now comes down to 18 degrees with a gain of 8.61dBi. There is also 5dBi of gain to be had at 8 degrees which is ideal for DXing. Unfortunately there is slightly more NVIS radiation on the 12m band than there is on the 15m band. Iβm sure with a little change in height this could be reduced such that the antenna provides only low angle radiation.
Multi-Band Delta Loop Antenna 12m 2D Far Field Plot
Finally we reach the 10m band, this is where the antenna has the lowest angle of maximum radiation. With 8.56dBi gain at 16 Degrees, 5.59dBi at 8 degrees and a much reduced NVIS radiation. This antenna should be excellent for the long haul on 28-29Mhz. (It would also make an excellent 11m/CB antenna).
Multi-Band Delta Loop Antenna 10m 2D Far Field Plot
Itβs interesting to note the similarities between this multi-band delta loop design and my Bi-Directional Slot Fed Antenna design. They both exhibit very similar radiation patterns and gain figures with the Slot Fed Antenna providing slightly more gain and an even lower angle of maximum radiation on the supported bands.
Overall this easy to construct multi-band delta loop antenna would be ideal for the HAM that just wants a single antenna for 30m and upwards or is looking to go portable. The only disadvantage is that a good Remote Auto ATU is required to provide matching of the antenna to the 50 ohm coax at the feed point. Something like the LDG RT100 would be an ideal ATU choice for this application and would remove the losses caused by having a high SWR on the coax feed to the antenna.
Using an ATU in the radio in the shack isnβt going to provide the same results as the coax cable from the antenna to the shack will become part of the antenna and will be detrimental to the antenna performance. It will also create high losses on the coax feed to the antenna due to high SWR being present over the length of the coaxial feed.
Iβve had this antenna model for ages now but, never got round to putting it onto the website until Alex, GM5ALX was talking about making one the other day whilst chatting on the QO-100 satellite.
The 20m band delta loop follows exactly the same design principles as all the other delta loop designs Iβve already put on the website. They are designed such that they present a 50 ohm impedance at the feed point and thus have no requirement for complex impedance matching circuits/transformers.
M0AWS 20m Band Delta Loop Antenna β Antenna View
The dimensions for the antenna are as follows:
Wire 1 β Horizontal exactly 1m above the ground for its entire 10.2m length. Wires 2 & 3 are exactly 6.18m long each with the top being 4.5m above the ground.
M0AWS 20m Band Delta Loop Antenna β 3D Far Field Plot
The 3D far field plot shows a typical delta loop radiation pattern with the maximum radiation through the loop and a deep null in the centre.
M0AWS 20m Band Delta Loop Antenna β 2D Far Field Plot
The 2D elevation plot shows that the antenna will give a maximum gain of -0.79dBi at 30 degrees when used over average/poor soil types. If like me you use your Delta Loop antennas on the beach then the antenna will present considerably more gain as it will benefit from the salt water reflection.
If you want to lower the angle of maximum radiation and increase the gain over average ground just raise the antenna up so that the top is around 7m above ground. This will give a much lower angle of radiation and improve the gain figure by 2-3dBi. Donβt forget that if you raise the antenna the point of resonance will also rise in frequency and so you may need to shorten the wires a little to get the point of resonance back to where you want it.
The SWR plot shows that the antenna will have a fairly wide bandwidth and match to 50 ohm coax extremely well. The antenna is designed to be fed in one of the lower corners via a 1:1 balun for best results.
M0AWS 20m Band Delta Loop Antenna β SWR Curve
Summary:
Total Wire Length: 16.38m Horizontal Wire Length: 10.2m @ 1m above ground Diagonal Wire Lengths: 6.18m Wire Dia: 2.5mm Height at Centre: 4.5m Feed Type: 1:1 Balun in bottom corner (Can use coax if necessary) Impedance: 50 Ohm SWR: <1.5:1 at resonance
Since setting up the new HAM station here in the UK the one band Iβve not yet got back onto is 160m, one of my most favourite bands in the HF spectrum and one that I was addicted to when I live in France (F5VKM).
Having such a small garden here in the UK there is no way I can get any type of guyed vertical for 160m erected and so I needed to come up with some sort of compromise antenna for the band.
Only being interested in the FT4/8 and CW sections of the 160m band I calculated that I could get an inverted-L antenna up that would be reasonably close to resonant. It would require some additional inductance to get the electrical length required and some impedance matching to provide a 50 Ohm impedance to the transceiver.
Measuring the garden I found I could get a 28m horizontal section in place and a 10m vertical section using one of my 10m spiderpoles. This would give me a total of 38m of wire that would get me fairly close to the quarter wave length.
For impedance matching I decided to make a Pi-Network ATU. Iβve made these in the past and found them to be excellent at matching a very wide range of impedances to 50 Ohm.
M0AWS Homebrew Pi-Network ATU
Since I still had the components of the Pi-Network ATU that I built when I lived in France I decided to reuse them as it saved a lot of work. The inductor was made from some copper tubing I had left over after doing all the plumbing in the house in France and so it got repurposed and formed into a very large inductor. The 2 x capacitors I also built many years ago and fortunately Iβd kept locked away as they are very expensive to purchase today and a lot of work to make.
Getting the Inverted-L antenna up was easy enough and I soon had it connected to the Pi-Network ATU. I ran a few radials out around the garden to give it something to tune against and wound a 1:1 choke balun at the end of the coax run to stop any common mode currents that may have appeared on the coax braid.
Connecting my JNCRadio VNA I found that the Inverted-L was naturally resonant at 2.53Mhz, not too far off the 1.84Mhz that I needed. Adding a little extra inductance and capacitance via the ATU I soon had the antenna resonant where I wanted it at the bottom of the 160m band.
M0AWS 160m Inverted L Antenna SWR Curve
With the SWR being <1.5:1 across the CW and FT8 section of the band I was ready to get on 160m for the first time in a long.
Since itβs still summer in the UK I wasnβt expecting to find the band in very good shape but, was pleasantly surprised. Switching the radio on before full sunset I was hearing stations all around Europe with ease. In no time at all I was working stations and getting good reports using just 22w of FT8. FT8 is such a good mode for testing new antennas.
As the sky got darker the distance achieved got greater and over time I was able to work into Russia with the longest distance recorded being 2445 Miles, R9LE in Tyumen Asiatic Russia.
In no time at all Iβd worked 32 stations taking my total 160m QSOs from 16 to 48. I canβt wait for the long, dark winter nights to see how well this antenna really performs.
M0AWS Map showing stations worked on 160m using Inverted L Antenna
The map above shows the locations of the stations worked on the first evening using the 160m Inverted-L antenna. As the year moves on and we slowly progress into winter it will be fun to start chasing the DX again on the 160m band..
UPDATE 6th October 2023. Been using the antenna for some time now with over 100 contacts on 160m. Best 160m DX so far is RV0AR in Sosnovoborsk Asiatic Russia, 3453 Miles using just 22w. Pretty impressive for such a low antenna on Top Band.
This is a 15m band delta loop design that Iβve put together as requested by Wim, PE1PME.
The 15m band delta loop follows exactly the same design principles as all the other delta loop designs Iβve already put on the website. They are designed such that they present a 50 ohm impedance at the feed point and thus have no requirement for complex impedance matching circuits/transformers.
15m Band Delta Loop Antenna View
The dimensions for the antenna are as follows:
Wire 1 β Horizontal exactly 1m above the ground for its entire 7m length. Wires 2 & 3 are exactly 4.12m long each with the top being 3.18m above the ground.
15m Band Delta Loop Antenna 3D Far Field Plot
The 3D far field plot shows a typical delta loop radiation pattern with the maximum radiation through the loop and a deep null in the centre.
15m Band Delta Loop Antenna 2D Far Field Plot
The 2D elevation plot shows that the antenna will give a maximum gain of 1.5dBi at 26 degrees with useful gain at lower angles.
The SWR plot shows that the antenna will have a fairly wide bandwidth and match to 50 ohm coax extremely well. The antenna is designed to be fed in one of the lower corners via a 1:1 balun for best results.
15m Band Delta Loop Antenna SWR Curve
Summary:
Total Wire Length: 15.24m Horizontal Wire Length: 7m @ 1m above ground Diagonal Wire Lengths: 4.12m Wire Dia: 2.5mm Height at Centre: 3.18m Feed Type: 1:1 Balun in bottom corner (Can use coax if necessary) Impedance: 50 Ohm SWR: <1.5:1 at resonance