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Re: Converting TR502 tracking generator to TR503

 

If you can get someone that has a NanoVNA H4 with the DSlord?firmware in it to sweep the crystal you have you should have all of the information you need to change to the 55MHz crystal.

There are some programmable?oscillator IC's?(is it SI Time?)

Or just order the programmable rock kit from QRP Labs and run it through a low pass filter:



73,

Sam

Sam Reaves
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On Sun, Mar 3, 2024 at 6:51?PM George Livanes <gmt1@...> wrote:

Hi Bruce,
Yes I saw your message, on ko4bb Thanks
My 7603 scope is temporarily sick and waiting my attention so my 7L13 system is out of action
Not sure if I will bother with this system anymore as the 7L13 is just too basic a specy (especially since I don't have the associated Tek frequency counter)...and the 7603 takes up too much real estate on my bench ....
So I was hoping to be able to convert the B.P.Filter without using the 7L13 (using a suitable VNA) so I can use my 494 with the modified Tracking generator

The Xtal is a worry..I think I can get it made locally but I suspect they will need more information

than it is a series resonant (I think I read 10ppm stability somewhere on the forum)
George
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