[GreenKeys] 170 shift to 850 shift converter??

[Harold Hallikainen]

Wow! Complicated device! On the transmit side, it looks like they use
crystal controlled mark and space oscillators, then frequency divide them,
then heterodyne them to the output frequency. On the receive side, they
use a temperature controlled UJT oscillator to heterodyne the received
audio to a frequency appropriate for the discriminator. It also does
diversity transmission and reception with a wide shift and narrow shift
signal sent simultaneously and received simultaneously. It would be
interesting to know if this does any better than using an XR2206 to
generate the FSK and XR2211 to demodulate it (and it even supplies mark
hold with no additional parts!).

Harold


> Manual here.  Filters appear to be sealed cans.
> http://radionerds.com/images/8/86/TM_11-5805-387-34-2.pdf
>
> John, W9DDD
>
>
>> On Mar 14, 2019, at 4:32 PM, JC White <jcw1231 at pacbell.net> wrote:
>>
>> Sorry, I was going wide to narrow, not narrow to wide... me bad!
>>
>> John
>> WB6BLV
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