[R-390] xtal wave spikes

[Dan Merz]

Hi,  in looking at the output from the front end high freq. oscillator
(40 to 60 Mhz xtals) on the Mackay 3010,  I noted double peaks on some
of the waveforms,  though the nominal frequency was ok.  My first
reaction was that this could be symptomatic of a failing crystal though
the output works ok and the right signals are received in the radio on
the band in use.   The spike occurs on the downside of the wave,  kind
of a minor glitch as the wave is decreasing.  Does anyone know what this
means or what is causing it?  Most of the xtals don't exhibit this
characteristic, but a couple are dead.  I'm going to replace the dead
ones - MH Electronics says they will provide replacements for $15 ea if
I'll send them a good crystal as example of spec's.  Is this a
reasonable price compared to other possible providers?  thanks,  Dan.