Normal view
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The SWLing Post
- Radio Waves: Switzerland to End Analog Radio, AM For Every Vehicle Act, AM v Safety, and Electromechanical Radio Transmitters
Video: New DRM Module covers 150 kHz to 108 MHz
From the Fediverse: Ham gallery, M17 mailing list, 44-ft. doublet
I’ve quit Twitter/X, and am now part of the Fediverse. There are quite a few radio amateurs in the Fediverse, and if you’d like to follow me there, you can follow @kb6nu@mastodon.radio. Mastodon.radio is a space for radio amateurs and SWLs, but it’s not the only radio-focused Fediverse server. It connects with the servers listed on fediverse.radio, including mastodon.hams.social, a server here in the U.S.
Mastodon seems to have a much higher signal-to-noise ratio than Twitter. Here’s a few links I found and things I learned on Mastodon last night:
K8CX Ham Gallery. K8CX has an interesting collection of photos from Dayton, DX sound clips, and a QSL card museum. I’ve submitted a couple photos of me and the ICQ Podcast crew at Dayton 2024.
M17 Users mailing list. The home page for this mailing list says, “The primary assumption of this mailing list is that M17 is (in June, 2024) in usable (enough) form for actual deployment and use in amateur radio.” They believe that all the pieces are there now. Typically, to use M17, you’ll have to be “somewhat of an experimenter” to work around the inevitable glitches in using M17, but in the opinion of this list founder, “all the pieces are there now”.
44-foot doublet. Last night, there was some discussion of portable antennas, mainly the 44-ft. doublet antenna. This is the antenna that L. B. Cebik describes on the web page, “1 Wire, 7 Bands, 2 Directions, or The 44′ Doublet as a 40-10 Meter Antenna.” There’s a similar antenna out there called the NorCal Doublet. The NorCal Doublet uses ribbon cable as the feedline to reduce weight. These two antennas look like they’d be worth experimenting with.
![Schematic diagram of an antenna.](../themes/icons/grey.gif)
See you in the Fediverse!
The gradual normalization of automated FT8
Xiegu X6200: Released for Preorder
KK4Z: Achieving Another Kilo Despite Solar Interference
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Getting Started with HF Digital Modes (Without Breaking the Bank)
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Ham Radio – Ham Events – Ham Reviews – Ham Links – Ham News
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- Unlocking Visibility: The New QRP Cluster for Radio Enthusiasts
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“Effective encryption” effectively debunked
Months of research prove the notion compressed data over ARQ modem techniques is anything, but effective encryption.
The post “Effective encryption” effectively debunked appeared first on Ham Radio . Magnum Experimentum.
Amateur Radio Digital Modes
So you are getting bored with CW, SSB and listening to people on the radio.
here is a Challenge: get into HF or UHF or VHF digital modes
PSK31, RTTY, JT65, FT8, FT4 and many more (these are the more popular ones.)
here is a list of digital modes and what each mode sounds like.
SOUND SAMPLES OF DIGITAL MODES
all digital modes use USB (uppersideband even 160,60,80,40,30)
FLDIGI supports CW, FELD HELL, PSK31, olivia, rtty, sstv and lots more
WSJTX supports JT65, JT9, WSPR, FT8, FT4 and others
Dimension4 or NetTime is what sync's your computer to everyone else on the frequency
***************************************************************
it is the easy thing you have done since you got your license
all you need is the following:
1. radio hf/uhf/vhf
2 computer if no soundcard then $3.00 usb thumbdrive soundcard works
3. antenna
4. FREE software: FLDIGI, WSJTX
5. FREE software: time sync, dimension4 or nettime
6. (sound card interface-TNC) this converts audio to digital and back digital to audio
soundcard interface/TNC = Rigblaster or Microham or Signalink or if already in newer SDR radios
***************************************************************
so download both pieces of software and check them out
and install them for your setup
even if you do not have all pieces stated above
just listen to 14.070 for PSK31 or 14.074 for FT8 and get a feel for what the software looks like
and what it is trying to do.
it just takes persistence!
make sure your ALC meter stays on 0 (if it is moving then there is something wrong!)
power out must be below 20 watts ( i use 5 watts most of the time)
a few handy websites:
http://hamspots.net/FT8/
http://hamspots.net/jt65/
www.pskreporter.info shows digimode automatic propagaton reporter
if you use Ham Radio deluxe or DxLab it works with those also.
you are more than welcome to peruse everything and comment about all or any of the items.
5/7/20 List of ham radio software FREE https://nl9222.home.xs4all.nl/digisoft.htm
**********************************************************************
so download both pieces of software and check them out
and install them for your setup YOU MUST KNOW YOUR COM PORTS
even if you do not have all pieces stated above.
just listen to 14.070 or 14.074 and get a feel for what the software looks like
and what it is trying to do.
FLDIGI AND FLRIG www.w1hkj.com
**********************************************************************
ka1uln@arrl.net
73
when running amateur radio digital modes all computers must be synced together
in order to have a qso. these are the 2 most popular apps to do the job.
http://dimension-4.en.softonic.com/ dimension 4
http://www.maniaradio.it/en/bkttimesync.html mania timesync
73 ka1uln
Want to learn Digital mode for Amateur Radio? FT8 or FT4
_________________________________________________________________________________
Want to to learn a Digital mode for AMATEUR RADIO? BPSK31
First of all what is PSK:
What is PSK?
– PSK is an acronym for Phase Shift Keying. Information is transmitted
through patterns of polarity-reversals (180 degree phase shifts), hence the
name.
– Narrow-band, low-power, soundcard-generated radioteletype mode for
keyboard chat.
– Three data rates, 31, 63 and 125 baud. Bandwidth increases with rate.
– PSK31 is the most commonly used, its data rate is close to the speed of the
average typist.
– PSK is resistant to interference but has no error control, so it's not suitable
for transfer of data files. © 2013 Eric Fowler / WV3E – All rights reserved.
HERE IS WHAT YOU NEED:
Fldigi is a computer program intended for Amateur Radio Digital Modes operation using a PC (Personal Computer). Fldigi operates (as does most similar software) in conjunction with a conventional HF SSB radio transceiver, and uses the PC sound card as the main means of input from the radio, and output to the radio. These are audio-frequency signals. The software also controls the radio by means of another connection, typically a serial port.
Fldigi is multi-mode, which means that it is able to operate many popular digital modes without switching programs, so you only have one program to learn. Fldigi includes all the popular modes, such as DominoEX, MFSK16, PSK31, and RTTY.
Unusually, Fldigi is available for multiple computer operating systems; FreeBSD™; Linux™, OS X™ and Windows™.
(taken from w1hjk.com)
how to recognize the bpsk31:
Recognising the different modes comes with experience. It is a matter of listening to the signal, and observing the appearance of the signal on the tuning display. You can also practise transmitting with the transceiver disconnected, listening to the sound of the signals coming from the computer. There is also (see later paragraph) an automatic tuning option which can recognise and tune in most modes for you.
The software provides a tuning display which shows the radio signals that are receivable within the transceiver passband. Using a point and click technique with the mouse, you can click on the centre of a signal to select it, and the software will tune it in for you. Some modes require more care than others, and of course you need to have the software set for the correct mode first — not always so easy!
The RSID (automatic mode detection and tuning) feature uses a special sequence of tones transmitted at the beginning of each transmission to identify and tune in the signals received. For this feature to work, not only do you need to enable the feature in the receiver, but in addition the stations you are wishing to tune in need to have this feature enabled on transmission. Other programs also offer this RSID feature as an option.
PSK31 Frequencies In MHz,
1.838
3.580
7.040 to 7.060 for region 1 and region 3, and 7.070 for region 2 *
10.140
14.070
18.100
21.080 (although most activity can be found 10 kHz lower)
24.920
28.120
psk link of all the psk frequencies >>psk frequencies
for more information on psk31 check
http://nharc.org/links/OperatingPSK.pdf
************************************************************************
Using the NO-84 (PSAT) PSK Transponder
Uplink is on the 10m PSK frequency of 28.120 USB and it downlinks on 435.350 FM (PSK31), the satellite builders recommend using up to 75w into an omnidirectional antenna on 10m.
Antennas
In my own experience of using NO-84, I was using a 10m dipole which worked reasonably well, but I found the best antenna for myself was a 10m GP this was easy to build with a small fibreglass fishing rod, wire and a dipole centre I made one for less than £10 (Bargain!)
I found with this setup I was able to activate the transponder with as little as 10w, however, of course, increasing the power made sure that NO-84 could hear my signal a lot more.
![Image of my 10m GP in the garden Image of my 10m GP in the garden](../themes/icons/grey.gif)
Software
Transmitting
Of course, with this satellite doppler is a consideration and although you can use a standard PSK31 application for transmitting and receive you’ll see your signal has the Doppler curve on it, however, K0SM has produced a simple application called DopplerPSK
Setting this up is simple, you download the application which is Java and launch it and then set some parameters. In Station -> Edit Station Information you specify your location like you would with any other tracking application. You then select the satellite you want to use by going to Satellite -> Choose Satellite and select NO-84.
It’s worth noting you’ll need to manually update the TLEs, these are stored in the /tle/ subdirectory. I’d recommend using the https://www.amsat.org/tle/current/nasabare.txt once you have updated the TLEs relaunch the application.
Select the output soundcard by clicking on Audio Device in the menu and selecting the correct one, remember this is the audio going to your radio.
On the main screen of DopplerPSK you’ll notice you have some tracking information and boxes update the MyCall with your own callsign and press update. Notice below that there are prepopulated text inputs and radio buttons to represent the one that has been selected for now use CQ.
Its generally recommended you transmit the whole time NO-84 is passing over. The other station will be on a different frequency to yourself, update their callsign in DXCall and the exchange and hit the Update button, again then select the message you want to send till the contacts complete. Then go back to CQ or reply to someone else if their calling CQ, this method seems to work well.
![DopperPSK - Set Location Dialog window DopperPSK - Set Location Dialog window](../themes/icons/grey.gif)
![DopperPSK Main Screen DopperPSK Main Screen](../themes/icons/grey.gif)
Receiving
To decode the signals, I personally recommend using a PSK application that supports multi decoding, for instance, FL-Digi, you can watch all the stations on the passband and your own and carry out your contact with ease.
Remember that if NO-84 doesn’t hear a PSK31 signal on 28.120 the transponder will not turn on unless it is sending its beacon signal.
Final Thoughts
Hopefully, this gives you some idea how to setup DopplerPSK to complete a NO-84 PSK QSO. It’s worth keeping in mind that activity can be low, so do not be scared to ask for prearranged contact.
Useful Links
- DopplerPSK – http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html
- 1/4 Wave Ground Plane Antenna Calculator – https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/
Downloads
The post Using the NO-84 (PSAT) PSK Transponder appeared first on 2M0SQL.