I think the MD-522 will run 85 and 850 shift simultaneously. IIRC John K9WT and Ron K3TZJ have experimented with this. 

The standard Navy frequency division multiplexing system AN/UCC-1 runs with 2-way or 4-way diversity. 
https://www.navy-radio.com/rtty-mux-ucc1.htm


Nick England K4NYW
www.navy-radio.com


On Sun, Jan 12, 2025 at 5:22 PM W2HX <w2hx@w2hx.com> wrote:
Has anyone ever tried combining two different shift streams into one? In other words, four tones in one audio stream? Would it allow one stream to work for two different audiences (say 170 shift audience and 850 shift audience)?


73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos


-----Original Message-----
From: greenkeys-bounces@mailman.qth.net <greenkeys-bounces@mailman.qth.net> On Behalf Of Harold Hallikainen via GreenKeys
Sent: Saturday, January 11, 2025 10:14 PM
To: Green Keys <greenkeys@mailman.qth.net>
Subject: [GreenKeys] Selective Fading Experiment

I ran an experiment comparing signal levels and fading with 850 and 170 Hz shift by transmitting four frequencies at once and seeing if they all faded together. My notes are at https://w6iwi.org/rtty/SelectiveFading/ .

Harold
https://w6iwi.org




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