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#11
September 16th 05, 04:55 PM
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On Fri, 16 Sep 2005 08:22:53 -0400, "TaxSrv" wrote
in :: "Larry Dighera" wrote: I don't think the transponders actually check for warmth. A transponder contains what is termed a Crystal Oven. This is a small chamber in which there is a heating element and a quartz crystal used to determine the transponder's transmission frequency. Which brands/models have that feature?? The frequency accuracy required by the TSO can be and is achieved without a crystal oven. The built-in turn-on delay is merely to allow the high-voltage supply to come up to full volts, and the cavity tube filament to heat up. Fred F. It was a long time ago that I was having difficulty with ATC receiving the Mode-C of our King KT-78a. Now that you mention it, it was the Mode-C blind encoder that had the heater in it, not the transponder. 
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