I have to agree with Hans . NP0 caps are fine in some
applications , but not all . I just changed a pair of them out in a filter and
replaced them with some high quality "glass" capacitors , which work much better
in this application.
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I am on the waiting list for a beacon , but while waiting
and having worked with QRSS60 for many years , know the crystal and oscillator
are the areas of real concern .
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I built my 10.140 MHz.?oscillator on a very small
board?separate from the transmitter . I soldered a thermistor to the
crystal to maintain a constant temperature . The entire board is then
encapsulated in a small container and filled with thermal conductive epoxy .Only
the leads for hookup to the transmitter come out of the package .
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I haven't yet had time to run many tests with it . I'll
post my results once I can run it for a few days under different temperature
conditions .
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Charlie , W5COV
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