[GreenKeys] Optimistic but clueless seller

[Alf Fisher]

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 
> <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 
> <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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