[TMC] [GreenKeys] Optimistic but clueless seller

[Nick England]

A similar Northern Radio FSK unit with similar BS about converting to a
preamplifier was bid up to $600 or so.
We are not the only crazy people out there.

———

Multi-channel TTY over HF was a common thing back in the day. The Navy’s
AN/UCC-1 provided 16 TTY signals in an SSB voice channel. That’s 32 using a
TMC ISB transmitter.

The TTY channels were usually “twinned” as diversity pairs. Or you could
use four channels for quadruple diversity.

http://www.navy-radio.com/rtty-mux-ucc1.htm

Nick

On Fri, Apr 23, 2021 at 11:41 AM Robert Nickels <ranickels at gmail.com> wrote:

> has listed a Northern 153 dual frequency shift keyer with some
> entertaining comments:
>
> https://www.ebay.com/itm/265133627883
>
> The manual can be found on the TMC History site;  custom plug-ins
> determine the tone frequency and the module that can be read is for
> 2167.5 Mark and 2082.5 Space, i.e. 85 kHz spacing.   The front panel tag
> shows another pair to be 2337 and 2252 Hz, also 85 Hz spacing.   So that
> would translate to 153Z12 and 153Z13 modules in this unit.
>
> Frequency-determining modules were sold by center frequency which is
> shifted +/- 42.5 Hz  and recommended 170 Hz channel spacing at 100 wpm,
> and the output of up to 18 channels can be combined. Eighteen keyers
> would fill one rack, then of course you'd need a couple of racks full of
> demodulators on the other end, which is why Northern came out with the
> transistorized version that put all 18 tone keyers and converters in
> less than 16" of rack space:
>
> http://tmchistory.org/NorthernRadio/Manuals/northern_230_235_tm.pdf
>
> It would be interesting to hear what 18 FSK tones would sound like over
> HF but according to the manual, these 18-channel systems were intended
> for use on microwave or wireline circuits.
>
> 73, Bob W9RAN
>
>
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-- 
Nick England K4NYW
www.navy-radio.com