[GreenKeys] West Coast RATT/RTTY net

[Ralph Mowery]

If you are using a SSB  receiver I do not see why not.  Just any tones could be used as long as they are 850 Hz apart.  For transmitting the same.  However you want to use  tones above 1500 Hz so the SSB filter will help cut out the 2nd and above harmonics if any are present.

 

Ralph ku4pt

 

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Nick England
Sent: Saturday, October 15, 2022 2:33 PM
To: harold at w6iwi.org
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] West Coast RATT/RTTY net

 

If I am transmitting military RATT on 7087 (USB, 2 khz tone. 850 shift, mark low) that means mark is 7088.575 and space is 7089.425

Can't you just tune your ham transceiver so that you are receiving and transmitting on those frequencies?.

If you are running 2125M/2975S tones, tune your transceiver to 7091.55 LSB and reverse M-S. Or tune your transceiver to 7086.45 USB and you don't have to reverse M-S.

 

Having typed the above I am sure I have transposed or miscalculated something, or missed the obvious fatal flaw.....

 

Nick England K4NYW
www.navy-radio.com

 

 

On Sat, Oct 15, 2022 at 1:07 PM Harold Hallikainen via GreenKeys <greenkeys at mailman.qth.net> wrote:

I'll try to make the 170 Hz shift net next week. Are the 1575/2425 Hz
tones standard for 850 Hz shift? I used 2125/2975 50 years ago, but I was
directly shifting a Viking Ranger and receiving with a National NC-300.
2975 Hz will definitely not make it through my SSB transceiver. I imagine
my Flesher TU-170 could be tuned to 1575/2425, but it would be a pain to
tune it back and forth. It is easy to make my DSP TU
(https://w6iwi.org/rtty/DspTU/ ) to use whatever tones are needed, but it
is not quite ready for prime time yet.

See you next week on 170 Hz shift.

Harold

On Sat, October 15, 2022 9:33 am, Daniel Jones wrote:
> Only had 1 other on the MRCG Net today.  It seems that the military tones
> 1575/2425 are an issue for some out here.
>
> We will try again next week (OCT 22) on 170hz shift on (7086 LSB)  and
> 850hz military (7087 USB) on the following weekend (Oct 29)
>
> Daniel

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