[MRCA] [Milsurplus] 40m RATT test Saturday 1330Z - 850 shift

Fri Aug 28 11:47:19 EDT 2020

Lot of this sprang forth with the idea of a GRC-106 RAT net, surprised that no one has come along telling us “you cant do this, wrong side band and way to wide shift” but I like the idea of a 106 net. May have to get another MD-522 and mechanical teleprinter and try running mobile from the mutt. Kind of thinking of using the 106 in the mutt with a laptop. Had a UGC-74 but that just about broke me in using something that weighs a hundred pounds and types text that you can barely see.
Along those strange lines I have a project that’s coming along using a MX10159 tactical network terminal to integrate with a Dovetron modem using some hardware that I built up to translate the digital output from the modem to the ASCII input of the terminal and hope to have that all together soon so I can have a rack full of primitive 8080/TTL technology that weighs over a hundred pounds to take the place of a UGC-74, but at least the red plasma display of the terminal is easier to see then the dead ribbon printer of the 74.

Ray F/KA3EKH

From: Nick England <navy.radio at gmail.com>
Sent: Friday, August 28, 2020 11:11 AM
To: Ray Fantini <RAFANTINI at salisbury.edu>
Cc: B. Smith <smithab11 at comcast.net>; Military Radio Collectors Association <mrca at mailman.qth.net>
Subject: Re: [MRCA] [Milsurplus] 40m RATT test Saturday 1330Z - 850 shift

CAUTION: This email originated from outside of Salisbury University. Please exercise caution when clicking links or opening attachments from external sources.

I was running the Navy AN/FRT-70, synthesized TMC xmtr,
USB, AFSK 2kc center tone, +/-425 shift - standard HF setting  from a Navy CV-3510B/UG TU.
Mark RF freq low - opposite of ham LSMFT standard.

K3TZJ was running Army gear with MD-522 proving that Gray and Green equipment can indeed talk to each other :-)

For 8/29 we will try 7087 USB with 2kc tone - meaning that the RF freq is 7089 center with +/- 425 shift

Cheers,
Nick England K4NYW
www.navy-radio.com<http://www.navy-radio.com>

On Fri, Aug 28, 2020 at 10:05 AM Ray Fantini <RAFANTINI at salisbury.edu<mailto:RAFANTINI at salisbury.edu>> wrote:
I can run upper or lower side band, the RF-350 can do both but with radios like the GRC-106 its audio generated tones and USB only. I did see some other stuff a little off channel last week but did not have time to QSY over and am wondering if that was you?
Somehow cannot imagine that the GRC-19 and GRC-106 cannot net directly, systems like the GRC-19 or GRC-26 used DC keying to generate offset of the MO in those old radios but everything beyond that used ASFK, have to wonder what Navy East was using for net control?

Ray F/KA3EKH

From: mrca-bounces at mailman.qth.net<mailto:mrca-bounces at mailman.qth.net> <mrca-bounces at mailman.qth.net<mailto:mrca-bounces at mailman.qth.net>> On Behalf Of B. Smith
Sent: Thursday, August 27, 2020 6:58 PM
To: Nick England <navy.radio at gmail.com<mailto:navy.radio at gmail.com>>; Military Radio Collectors Association <mrca at mailman.qth.net<mailto:mrca at mailman.qth.net>>
Subject: Re: [MRCA] [Milsurplus] 40m RATT test Saturday 1330Z - 850 shift

CAUTION: This email originated from outside of Salisbury University. Please exercise caution when clicking links or opening attachments from external sources.

I realized during the RTTY session last  Saturday morning when running my GRC-19  that if the receiving station is on USB then my "FSK standard keying" of the carrier Mark low, Space high will be reversed.  You would l have to be on LSB for correct orientation of my signal which is actual FSKing  of the RF carrier or you could revert to copy Mark or Space copy only and its easier if  you are running one of the older TU's to just flip the "reverse switch"    To be clear I am not running "tones" I am actually shifting the frequency of the carrier.      So there is a FSK keying comparability problem with newer equipment  using audio generated FSK carrier and USB as the standard. And of course most of the newer military radios have USB only and I understand the choice of USB.
Using a actual older Terminal Unit and receiver  and actual carrier FSK you manually tune in Mark first, zero beat the transmitter on the mark and go from there.  Later if necessary  for different shifts you can "straddle" tune the signal.
I always liked actual FSK of the RF carrier  vs audio generated. You don't have to worry about audio distortion and can run higher power and usually you can run the FSK circuit off of the keying of local loop power supply.  But now it looks like I need to dig into the T-195 keyer and modify it to be comparable with the other signals.
It would help if stations could do some extra CR's and LF's to ensure those old machines keep up. It might be wise for stations to do  a couple of lines of RY's (SG's) initially for those  that have not been on RTTY before. If you don't mind let others know of my problem and for now  I will have to continue with the problem of being reversed on USB.  It would be interesting to see if I can FSK the GO-9 for a first.  Thanks to Nick for generating the interest interest. I look forward to actual Machine to Machine QSO's with the older TU's etc.
Z
[cid:image001.gif at 01D67D30.EFD90DD0]

On 8/26/2020 1:12 PM, Nick England wrote:
Give a listen - join in the fun. We are switching to the same freq as Clatternet West - 0930 EDT (1330Z) Saturday 8/29

7087 kc USB using a 2 kc +/-425 cps tone, so 7088.575 kc mark, 7089.425 kc space. 45.45 baud.

Ron K3TZJ is having some local noise issues so I'll be generating some RY and QBF messages - and hoping for a reply.

Cheers,
Nick England K4NYW
www.navy-radio.com<http://www.navy-radio.com>

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