[TMC] VOX stability

[Sheldon Daitch]

Last paragraph, change AVC to AFC.

Sheldon

Sheldon Daitch wrote:
> Larry,
>
> Many of the high end diversity receiving systems had AFC circuits.
>
> Check out the CV-157 converter, for instance.
>
> Also, the RCA SSB-3 Receiver system had an AFC circuit, and
> I believe the Pioneer Diversity system also had an AFC circuit.
>
> The transmitters for SSB/ISB and RTTY many times would have
> a small amount of carrier (pilot carrier) injected into the transmitted 
> signal and
> the receivers had a sharp carrier filter and system designed specifically
> to track this pilot carrier and keep the end to end system on
> frequency. 
>
> For instance, check out the second page of the MMX-2 sales
> brouchure:
>
> http://jptronics.org/radios/TMC/bulletins/TX/tmc.ssb_204-4115.pdf
>
> Transmit characteristics, the level of carrier suppression is selectable,
> specifically for that purpose.
>
> These AVC circuits would keep the end-to-end frequency error under 1 Hz,
> if working right.  It didn't mean the system was on the absolute correct
> frequency, just the system was together.
>
>
>
> 73
> Sheldon
>
>
>
> TELEGRAPHER at att.net wrote:
>   
>> What would the requirements as far as stability of a transmitted signal have been back in the 60's?  Whether high seas, Navy, Attache, etc.  Now i am asking this concerning an AM signal.  This unit with drift of + or - 100 cycles could not have been useful in CW, SSB nor RTTy service.  Should an end user expect 20 cycle accuracy?
>>
>> larry
>> W0OGH
>>
>> l
>>   
>>     
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