[TMC] Optimistic but clueless seller

[Larry]

Makes you wonder if they are a kind of knic-knack store that got this at 
an estate sale or was given it and truly don't have a clue as to what 
it's worth.  Run into this a lot while browsing around junk stores of 
this nature. Owners typically won't budge on price cause they know what 
it's worth. yep.

I had one of these that was like new condition, no freq determining 
modules.  Sure would have liked to had it working but other than 
plugging it into a wall outlet to see if the tubes etc lit up, did 
nothing with it.  Don't remember who i sold it to or what i got for it 
but it wasn't much i can tell you that.

Larry W0OGH


On 4/23/2021 8:39 AM, Robert Nickels 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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