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Author Topic: Shrimpers 6925 USB 0048 UTC 23 Oct 2013  (Read 3450 times)

Offline ChrisSmolinski

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Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« on: October 23, 2013, 1151 UTC »
Mr Shrimper talking to Mrs Shrimper, asking if she got the email he sent. She could not hear him, so he said he would try the other channel.
Chris Smolinski
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Offline jFarley

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #1 on: October 23, 2013, 2024 UTC »
Also heard here with good signals, and I was quite surprised to hear an EE Shrimper Gal; first time here.
Joe Farley, Near Chicago
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Offline jFarley

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #2 on: October 25, 2013, 2057 UTC »
Mr and the Mrs heard again last night around 0146z.  I got the impression that the Mrs was on dry land with truck problems.  Also ment they were moving to the alt freq of 8825.
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Offline Sealord

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #3 on: October 25, 2013, 2102 UTC »
Also heard this as well - I know where that repair shop is they were talking about taking the truck to, lol.
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Offline jFarley

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #4 on: October 25, 2013, 2105 UTC »
Also heard this as well - I know where that repair shop is they were talking about taking the truck to, lol.

So, you going for QSL #1?
Joe Farley, Near Chicago
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Offline Sealord

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #5 on: October 25, 2013, 2113 UTC »
Shrimpers Swag Special: Bocephus, Budweiser & Beech-Nut :)
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Offline ChrisSmolinski

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #6 on: October 25, 2013, 2249 UTC »
Mr and the Mrs heard again last night around 0146z.  I got the impression that the Mrs was on dry land with truck problems.  Also ment they were moving to the alt freq of 8825.

Nice, now we know the alternate frequency - I never heard them say what it was.  Isn't 8825 in the aviation band?
Chris Smolinski
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Offline ChrisSmolinski

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #7 on: October 25, 2013, 2252 UTC »
I've figured out the selective calling system (the burst at the start of a QSO) they use, by the way. How much interest would there be in a decoder for it?   Or, for those amongst you with a transmitter... an encoder?  ;D
Chris Smolinski
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Offline CaptnKliegle

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #8 on: October 26, 2013, 0056 UTC »
Yes, 8825 is used by Gander and Santa Maria for the NAT's (North Atlantic Tracks).

Every aircraft has a decoder that's programed to a specific 4 letter 'tones' called SELCAL (Selective Calling)
The first two and the last two of the four tones are mixed (sent at same time like DTMF tones are made of two sets of tones) i.e. AD-HJ  

Upon initial HF radio check in with Oceanic Control, we ask for a SELCAL check to make sure the decoder works and if there's propagation. After the controller sends the tones, we get chimes and lights, alerting us that ATC want's to speak with us. After check in, we turn the volume completely down so we don't have to listen to all the chatter and/or static for hours as we cross the Atlantic.

At the 30 degree longitude, we repeat the above for we are entering a different controlled airspace. i.e. Gander, Shanwick, NY, Santa Maria, etc...

The FEDs would love to know who they are, or where they are... QRMing aviation frequencies is not taken lightheartedly! Just look at all the fines the FCC dishes out to those to QRM aviation freqs.

From    http://www.selcalweb.co.uk/faq.html#3

How do selcals work?

Each letter of the selcal code corresponds to a frequency in the audio range.

Alpha - 312.6 Hz
Bravo - 346.7 Hz
Charlie - 384.6 Hz
Delta - 426.6 Hz
Echo - 473.2 Hz
Foxtrot - 524.8 Hz
Golf - 582.1 Hz
Hotel - 645.7 Hz
India - not used
Juliet - 716.1 Hz
Kilo - 794.3 Hz
Lima - 881.0 Hz
Mike - 977.2 Hz
November - not used
Oscar - not used
Papa - 1083.9 Hz
Quebec - 1202.3 Hz
Romeo - 1333.5 Hz
Sierra - 1479.1 Hz

The frequencies are not harmonics, thereby reducing interference.  The selcal is transmitted using Single Side Band, full carrier AM using an encoder such as the one shown below.  Every aircraft HF radio contains a USB transmitter as well as an AM receiver in the same unit.  The audio signal from the AM detector is connected to a decoding network that uses PLL (Phase Locked Loops) to identify the incoming signals (although many modern aircraft now have selcal decoders that use DSP circuits to decode the codes without the need for PLL).  If the tones match what the aircraft is programmed for then a chime or gong will sound in the cockpit and a light will illuminate on the radio panel to signify which radio (HF1, HF2 etc) received the selcal tone.  If the tones do not match then they are ignored and nothing happens


And No, I'm not a boat captain, just an aircraft captain!  ;D
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Offline Echo_One

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #9 on: October 26, 2013, 0101 UTC »
Thanks, Captain...

Who do you fly for?
Echo One - Bringing An English Eccentricity To The Air Waves

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Offline CaptnKliegle

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #10 on: October 26, 2013, 2329 UTC »
One of those bankrupt ones!  :-[

Well that narrows it down a bit eh?  ;D
 
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Offline ChrisSmolinski

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #11 on: October 27, 2013, 1501 UTC »
I've been working on my NECODE decoder. The shrimper transmission at 0146z on 25 Oct 2013 starting with this selcall: 3508 20
3508 20 was also noted at 0147z on 17 Oct 2013
3508 80 a little later at 0159z on 17 Oct 2013 and again at 0246z

I went back to some other recordings I had made, and found these:
3310 11
3511 10
3518 11

The 4 digit number is the station being called. The 2 digit number is the ID of the calling station: http://www.necode.com/322ARX_Manual.pdf

I'm going to try to document the selcalls they use, hopefully there aren't too many.
« Last Edit: October 27, 2013, 1619 UTC by ChrisSmolinski »
Chris Smolinski
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Offline ChrisSmolinski

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #12 on: October 29, 2013, 1629 UTC »
I'll release a beta of MultiMode OSX with the NECODE decoder shortly. I'm working on adding a CODAN decoder to it as well.

In the mean time, I updated the SelCall desktop app (Windows and Mac) to properly send a NECODE call (previously I didn't have a field for the sender's 2 digit ID): http://www.blackcatsystems.com/software/selcall.html

It would be completely inappropriate to use this on 6925 with the Shrimper's call address. Especially when they're likely to be sleeping.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 58 ft T2FD / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop

Offline refmo

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Re: Shrimpers 6925 USB 0048 UTC 23 Oct 2013
« Reply #13 on: October 30, 2013, 0113 UTC »


It would be completely inappropriate to use this on 6925 with the Shrimper's call address. Especially when they're likely to be sleeping.

Yes, that would be inappropriate.  The Shrimpers might have to vacate that frequency if someone were to abuse that feature.....
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