[GreenKeys] Optimistic but clueless seller

[eric]

On 2021-04-23 12:45, Nick England wrote:

> I think I found the source of the Northern Radio madness -
> https://www.ebay.com/itm/233858858364
> this Tone Keyer SOLD in January for $1651.00
> 
> Holy Smokes....

It's hilarious to me that they're actually *advertising* it as a "tube 
amplifier preamp."

> 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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