[GreenKeys] Optimistic but clueless seller

[John, W9DDD]

I was wondering what the scale was on the "UV" meters.  Was it 
milliwatts per square meter or lumens?

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 4/23/2021 1:05 PM, Alf Fisher 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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> 
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>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: 
>>>> https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: 
>>>> http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: 
>>>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
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>>>> http://comcents.com/tty/greenkeyssearch.html
> 
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