[GreenKeys] Vintage RTTY operating question

[Ralph Mowery]

I use LSB  ( assuming tones of 2125 mark and 170 hz shift) with  the filter set for around 500 hz.   Set the AGC to fast if it is selectable . Normal or on if not .  I use a ST-6 so it normally keeps the machine in the ‘quiet’ mode unless receiving a valid rtty signal.  

 

What are you using as a receiver and  demodulator ?

 

De ku4pt

 

 

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Nick England
Sent: Saturday, December 29, 2018 3:45 PM
To: Greenkeys
Subject: [GreenKeys] Vintage RTTY operating question

 

Please forgive the newbie ignorance.....

What is the best way to listen for RTTY in a high noise environment?

I can receive in LSB mode with 3.2kHz nominal bandwidth

- the downside is wider bandwidth means lower s/n.

- the upside is that the no-signal noise is broadband so the AGC keeps the M/S noise low and the TTY doesn't chatter.

OR

I can receive in CW mode with 300 Hz nominal bandwidth and BFO set to 2100Hz

- the downside is that the no-signal noise is all concentrated near the M/S frequencies so I get TTY chatter.

- The upside is presumably better s/n when a signal is present

 

Is the "solution" to use narrow-band CW mode with AGC disabled and use the manual RF gain to keep chatter noise low?

 

Thanks in advance & Happy New Year

Nick England K4NYW
www.navy-radio.com

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