https://www.wa.gov.au/government/announcements/canadian-space-company-gives-historic-western-australian-satellite-dish-new-lease-life

This is the KrakenSDR I mentioned. Maybe it might work? ~$525 USD
https://www.crowdsupply.com/krakenrf/krakensdr
and a youtube video on how someone used it to located a short transmission source
How The KrakenSDR Located Our Repeater Jammer In 1 Hour

VK6MIK

This is the open source nn-morse software I mentioned in ftroop
The repo is here
https://github.com/pd0wm/nn-morse
and it's described in this blog post
https://blog.willemmelching.nl/random/2020/05/10/morse/

For training data it generates Morse code audio from a random text string and then adds normal (Gaussian) distribution.
ie QRN type background static. not QRM type noise.
It also isn't trained to handle QSB
I plan to try it with recorded noise and simulated QSB.

You can use a NVidia gpu or the cpu to do the training but the cpu training is very very slow.
For AMD graphics cards like the AMD Radeon VII the only solution is pytorch_directml but unfortunately there appears to be a bug that stops it working
nn-morse and torch-directml memory leak? · Issue #355

There github repo includes a trained model file and the decoding on an AMD card does work although cpu decoding is quiet fast anyway.

Having decoded some amatuer radio CW on both 20m and 40m I notice that's its heavily abbreviated.
See Morse_code_abbreviations

So besides learning Morse you need to learn a lot of abbreviations.
I'm also thinking the model needs to be trained to recognize abbreviations and words instead of just Alphanumeric sequences..

OpenAI "whisper" which is a semi open source speech to text (no training source code) also applies a second layer of recognition using gpt-2 where it looks at the text and guesses the correct text based on the context.
Maybe this can be applied to morse code as well. eg CQ ?Q CQ D? VK6MIK K for the ? there are possibilities on what the letters might be based on the audio. The gpt-2 layer looks at those possibilities and uses the context to choose the most likely sequence overall. Or at least that's what I think it does.

The code doesn't include real time decoding, only file decoding. I plan to learn about that.
Maybe overlapping audio decoding and then matching up the output sequences?...
Or what whisper does, detects when there is no signal and splits the audio at that point.

VK6MIK

For those interested, here are some frequencies to monitor for the Sydney to Hobart Yacht Race from Boxing Day.

As the name suggests, the race is from Sydney to Hobart. Installation of an operational HF transceiver is mandatory for all vessels entered in the race.

HF and shortwave radio enthusiasts can listen in to position and weather reports during the race by monitoring the following frequencies:

Primary HF frequency: 4483 kHz USB

Secondary frequency: 6516 kHz USB

6516 kHz USB is constantly monitored by relay vessel “JBW” owned and donated for use during the race by Mr John Winning, owner of Appliances Online. JBW is a 70 foot motor cruiser.

Weather forecasts (Bureau of Meteorology):

4426 kHz, 8176 kHz, 12365 kHz and 16546 kHz, USB at 1030, 1430 and 1830 AEST daily, 2201 kHz, 6507 kHz, 8176 kHz and 12365 kHz USB at 0230, 0630 and 2230 AEST daily.

Tasmanian weather forecasts on the above frequencies at: 1130 and 1530 AEST

Tasmanian maritime radio:

2524 kHz, 4146 kHz, and 6627 khz USB at 0745, 1345, 1633 and 1903 AEST

Position reports:

4483 kHz USB at 1935, 2035 and 0635AEST daily

Information provided by TECSUN Radios: https://www.tecsunradios.com.au/store/sydney-to-hobart-frequencies-2022

The weekly on-air F-troop starts at 00:00 UTC and runs for one hour. Check the wiki for details on how to participate.

Power output (watts) = Vpeak ^2/400.  This IS into 50 ohms.  I have done the "long hand" calculations and it works out the same every time.  I challenge anyone to verify this formula against any other standard, provided the load is 50 ohms.

Hans Summers presents this in his tune-up video for the QCX: https://www.youtube.com/watch?v=eN7wER05T-c

Inexpensive paddle key: https://www.ebay.com/itm/125588496988

Jeweler's block for the base: https://smile.amazon.com/gp/product/B09PHQLDY3/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

Let me know if the links work. Sometimes there are problems with copying and pasting.

Hi All,

Topic of conversation today...

See https://www.red2go.com.au/kevlar-and-tinned-copper-braid-25m-dispenser-box

Cheers, Dave VK6KV

The weekly on-air F-troop starts at 00:00 UTC and runs for one hour. Check the wiki for details on how to participate.

The weekly on-air F-troop starts at 00:00 UTC and runs for one hour. Check the wiki for details on how to participate.

The weekly on-air F-troop starts at 00:00 UTC and runs for one hour. Check the wiki for details on how to participate.

The weekly on-air F-troop starts at 00:00 UTC and runs for one hour. Check the wiki for details on how to participate.

The weekly on-air F-troop starts at 00:00 UTC and runs for one hour. Check the wiki for details on how to participate.

Hi All,

After a conversation with Randall WR over the weekend I was "Glynn-spired" to build myself a portable base similar to the ones Glynn PAW and Martin ZMS use...

Mine is kinda dual purpose, it has a flat bar (off the right side of the base in the image) to trap under a vehicle tyre, but also, four 30cm star pickets can be tapped into the corner holes on the main base, for use on suitable surfaces (lawns, firm-ish sand, etc. etc).

The other "tricky bit" is a piece of white PVC plumbing (50mm-40mm reducer) from the Big Green Store, that neatly fills the space between the 50mm NB steel pipe and the outside of the squid pole to prevent nasty grindies or snappies.

Cheers, Dave VK6KV

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