[MRCG] Clatternet Schedule for Sunday 8/3/2014 20:30 TONIGHT

[Thomas Murphy]

I heard you guys, very strong signals but I have no means to decode.


 
Tom, W6TOM

-----Original Message-----
From: MRCG [mailto:mrcg-bounces at mailman.qth.net] On Behalf Of Mark J. Blair
Sent: Sunday, August 03, 2014 7:27 PM
To: West Coast Military Radio Collectors Group
Cc: Jim Falls
Subject: Re: [MRCG] Clatternet Schedule for Sunday 8/3/2014 20:30 TONIGHT

UPDATE! It was pointed out to me that the frequency I picked is just over
the digital sub-band edge. So, we'll QSY 50 kHz lower this evening. We can
discuss a better frequency later if that's not an optimum one for any
reason.

Updated announcement:

Folks, Tim N6CC and I plan to try another Clatternet tonight at 8:30 PM.

This setup was chosen for best compatibility with the military gear likely
to be used on Clatternet.

Mode:
* RTTY, 5 bit Baudot code, 45.45 baud
* 850 Hz shift
* Mark low (this is opposite of normal ham band convention)

Actual transmitted frequencies:
* Mark  3551.575 kHz (+/- QRM in 1 kHz steps)
* Space 3552.425 kHz

Tune a PRC-47 or GRC-106 as follows:
* Indicated freq 3550 kHz. USB, of course.
* Mark tone  1575 Hz
* Space tone 2425 Hz
* Centered around 2000 Hz

For a modern SSB rig with a sound card modem, this setup might work better:
* Indicated freq 3550.5 kHz USB
* Mark tone  1075 Hz
* Space tone 1925 Hz
* Centered around 1500 Hz

A true FSK rig like a GRC-46, GRC-26, etc. would tune to 3551.575 kHz (LOL!
Just zero-beat one of the SSB-based rigs on the net!).

I'll be using a Yaesu FT-450D tonight, with a SigaLink USB interface and
running fldigi on my Mac. Getting my vintage RTTY gear running is on my long
list of to-dos!

-- 
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/

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