[GreenKeys] PLL TUs

[telegrapher at att.net]

I have wondered over the years why someone didn't do incorporate a PLL 
in the tuning system of some of the TU's that would synch the receive'd 
incoming rtty tones with those of the transmitted and that would control 
the transmitted frequency.  Or something like that.  ANyway what it 
would have accomplished would be a nice reliable method of netting the 
receiver to transmitter and keeping them netted with respect to the RTTY 
tones both receive and transmit.  Course with todays "transceivers" it's 
not such a problem.

Way beyond my capabilities.

Larry
W0OGH

WB6BLV wrote:

> Hi Ralph,
> 
> I think you are talking about repeater control using the
> 567 tone decoder chip.  I am referring to the designs
> that use the 565 PLL to track FSK in the 2 - 3 KHz
> (or elsewhere as needed) range.  Most of the designs
> consist of a 565, followed by a comparator, and at times
> there is a 741 or similar band-pass filter ahead of the 565
> to eliminate out-of-band tones.
> 
> John
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