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

[Nick England]

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


On Fri, Aug 28, 2020 at 10:05 AM Ray Fantini <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 <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>; 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 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
>
>
>
> 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
>
>
>
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