[ARC5] T-11 Crystals

[Robert Eleazer]

David:  

 

Thanks for your advice, When I replaced the 2nd LO of a NC-155 with a crystal oscillator I thought about pulling an available crystal to the correct frequency.  Then Brian provided me with some info that showed such pulling would amount to nothing useful.  However, given that we are talking 12 or 18 times the crystal frequency it might be useful.

 

The closest crystal I have found, an HC-6/U set at 6.846875 MHZ, is only $5.00, and presumably would produce 123.24375 MHZ in the T-11.  So if I could pull the crystal fundamental frequency down by just a few KHZ that would work.  As I understand it, adding capacitance in parallel will only pull it down, so it has to be above the desired frequency.

 

As to why I am interesting in doing this, I have often thought it would be neat to have such a transmitter in my hangar, but my interest increased after an incident a few weeks ago.  I looked up to see a Cessna right over the runway numbers in a perfect landing attitude - and his gear was up.  I thought, "No, surely he's not."  In any case, there was no way I could get to the radio in the airplane fast enough to do any good.  The fire trucks showed up a few minutes later; he had landed gear up.

 

If I had a transmitter already turned on where I could just grab the mike and yell I might be able to prevent something like that.  I have a perfectly good Icom aircraft band handheld but I do not plan to leave it lying around the hangar.

 

Thanks!


Wayne