[GreenKeys] PLL TUs

[Lester Veenstra M0YCM]

Of course, this is exactly what the software (soundcard input) modems do on
a PC platform.

Full Name:      Lester B Veenstra 
Job Title:      Communication Sys Des Engr Sr Stf 
Department:     6L01 Site Operations Collaboration  and Reach-Back (SOCAR) 
Company:        Integrated Systems & Solutions 
Business Address:       Lockheed Martin IS&S 
PSC 45 Box 781
APO AE 09468 


Dawn Cottage
Norwood
Harrogate HG3 1SD  UK 
 
Telephones:  
 
Office             940-6456
Office             +44-(0)1423-846-385
Home:           +44-(0)1943-880-963              
UK Cell          +44-(0)7716-298-224 
US Cell          +1-240-425-7335
Jamaica        +1-876-352-7504
 
-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of telegrapher at att.net
Sent: Thursday, December 14, 2006 8:33 PM
To: WB6BLV
Cc: GreenKeys at mailman.qth.net
Subject: Re: [GreenKeys] PLL TUs

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
> _______________________________________________
> GreenKeys mailing list
> GreenKeys at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/greenkeys
> 
_______________________________________________
GreenKeys mailing list
GreenKeys at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/greenkeys