[GreenKeys] Optimistic but clueless seller

[steve bennett]

 Alf, I don't know everything but I did stay at a Holiday Inn Express last night.-Steve

    On Friday, April 23, 2021, 04:13:36 PM EDT, Alf Fisher <alffisher2 at gmail.com> wrote:  
 
  Absolutely right Steve.
 
 
 On 23/04/2021 21:07, steve bennett wrote:
  
 
 Alf, 
    Power chords are not major or minor. Just the root and the fifth 
  Rock on and be excellent to each other, -Steve. 
      On Friday, April 23, 2021, 02:07:27 PM EDT, Alf Fisher <alffisher2 at gmail.com> wrote:  
  
   He must be a musician - he said the power chord is severed.
 I wonder what chord that is - maybe a Bb major?
 
 
 On 23/04/2021 16:39, 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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