[Milsurplus] [MRCA] [MMRCG] Clatternet East? Military RTTY

Nick England navy.radio at gmail.com
Fri Apr 3 18:55:47 EDT 2020


Yes yes yes. What Tim says!

Clatternet standard is what Ray and I were running today and what we must
run with vintage military rigs.  Unlike ham gear, we can’t run on just any
old frequency.

A Navy HF TU (CV-2460 or CV-3510) has 2000 Hz tone with +/-425 shift. The
USB “carrier” can only be on 0.1 kHz steps because of the design. So the
center frequency (which is how military gear specifies RATT freq) can only
be on 0.1 kHz steps.

Sorry for hammering on this. It would be much simpler if we could sit down
with a couple of beers and draw diagrams on a napkin.

Basically, forget about ham RTTY - they have to adapt to us because we
cannot adapt to them.

Keep on clattering
Nick K4NYW

On Fri, Apr 3, 2020 at 6:06 PM Tim Sammons <timsamm at gmail.com> wrote:

> Hi Ray - that should work with these tones...Eg:  With the PRC-47 running
> AFSK, the Window Frequency is 7087 kc.  As a USB radio that is the
> suppressed carrier frequency.  The system generates fixed audio tones for
> mark = 1575 cps and space = 2425 cps in the audio filter passband.
>
> The RF freqs are as follows.  I think a pure FSK transmitter could be set
> up like this, I know it works with the T-195 and GRC-106 RATT systems, they
> have been on our nets:
> Nominal Channel Frequency 7087 kHz *as indicated on a USB AN/PRC-47*
> Mode RTTY, 850 Hz shift, MARK LOW, 5 bit, 45.45 baud
> Actual Mark Frequency 7088.575 kHz (channel + 1575 Hz)
> Actual Space Frequency
>
> 7089.425 kHz (channel + 2425 Hz
>
>
> On Fri, Apr 3, 2020 at 2:46 PM Ray Fantini <RAFANTINI at salisbury.edu>
> wrote:
>
>> I was doing 850 Hz shift today with Nick (K4NYW) and know he was using
>> old school 28 teleprinter and knowing him some Navy TU, I don’t have a
>> mechanical teleprinter now but will get one at some point but I was running
>> 850 Hz shift on 7.087 USB feeding the RF-350 ASFK via the patch port.
>>
>> Using MITTY you can use the AFC function and as long as the shift is
>> specified the AFC will modify the tones to what ever frequency you want,
>> not like the days of having to have fixed tones. So I am going to listen
>> for Net Control, set my Mark frequency to 2125, turn the AFC off and tune
>> my radio there. I would assume that will put me right for the other
>> stations on the net? If not 2125 Hz for Mark what then?
>>
>> Not trying to be difficult just curious.
>>
>>
>>
>> Ray F/KA3EKH
>>
>>
>>
>> ------------------------------
>> *From:* Ron Boltz <rl.boltz at mhsdesign.com>
>> *Sent:* Friday, April 3, 2020 5:32 PM
>> *To:* Ray Fantini <RAFANTINI at salisbury.edu>; mrca at mailman.qth.net <
>> mrca at mailman.qth.net>; MMRCG at groups.io <MMRCG at groups.io>;
>> milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
>> *Subject:* RE: [MRCA] [MMRCG] Clatternet East? Military RTTY
>>
>>
>> I’m ready but suggest we use 850 shift, mark low, military tones.  Those
>> of us with mil gear can operate this way.  I can do others but would need
>> to go with the RF-350K and even with mine which has the AFSK board is mil
>> spec shift and tones. Or I have the ST8000A which can do anything.
>>
>>
>>
>> Ron Boltz
>>
>>
>>
>> *From:* mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> *On
>> Behalf Of *Ray Fantini
>> *Sent:* Friday, April 3, 2020 4:01 PM
>> *To:* mrca at mailman.qth.net; MMRCG at groups.io; milsurplus at mailman.qth.net
>> *Subject:* Re: [MRCA] [MMRCG] Clatternet East? Military RTTY
>>
>>
>>
>> Have modern RAT Rig all ready to go using RF-350 K and PC that I put
>> together running XP and a sound Blaster card using MTTY software.
>>
>> Last year got feed up with UGC-74 and the 850/85 Hz only MD-522 and got
>> rid of them. Now I find myself jonesing for a mechanical teleprinter again.
>> Years ago I had a UGC-129 or maybe or maybe I can find one of the Mite
>> teleprinters? Hell of a time for all the Ham Fest to be canceled.
>>
>> Just don't have the floor space for something big and impressive like a
>> model 28
>>
>>
>>
>> Ray F/KA3EKH
>>
>>
>> ------------------------------
>>
>> *From:* MMRCG at groups.io <MMRCG at groups.io> on behalf of W2HX via groups.io
>> <w2hx=w2hx.com at groups.io>
>> *Sent:* Friday, April 3, 2020 2:04 PM
>> *To:* MMRCG at groups.io <MMRCG at groups.io>
>> *Subject:* Re: [MMRCG] Clatternet East? Military RTTY
>>
>>
>>
>> Wonderful!
>>
>>
>>
>> *From:* MMRCG at groups.io <MMRCG at groups.io> *On Behalf Of *Nick K4NYW
>> *Sent:* Friday, April 3, 2020 1:10 PM
>> *To:* MMRCG at groups.io
>> *Subject:* Re: [MMRCG] Clatternet East? Military RTTY
>>
>>
>>
>> Yay!
>>
>> Ground-breaking RATT QSO between Ray and me just now.
>>
>>
>>
>>
>>
>> On Fri, Apr 3, 2020 at 12:26 PM John W8SDA (ex WD8INC) <
>> jcaldwell at rbcos.com> wrote:
>>
>> Nick,
>> On Saturdays, we usually start early around 9:30 so as to hold the
>> frequency for the 10AM net so that may not be the place to test RTTY at
>> that time.  Since Ray appears to be your clatternet partner in crime, how
>> about you guys work to what suits your schedules to prove this out.  From
>> there you guys can name a time and frequency and post it to the group.  We
>> can also put it on the groups homepage and the website.  This is the
>> motivation I need to dust off some of the RTTY gear that keeps following me
>> home.
>>
>> John W8SDA
>>
>> --
>>
>> Nick England K4NYW
>> www.navy-radio.com
>>
>> _._,_._,_
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> --
Nick England K4NYW
www.navy-radio.com
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