Howard -
Yes, that is for Fixed Frequency (FF) operation. The XTAL switch has to
be in the FF position. The small hole to the left of the socket is to
adjust the trimmer cap and pull the crystal exactly on frequency. The
crystal must be 5.645 MHz ABOVE the desired transmitter frequency, and
if the crystal is above 15 MHz, the crystal should be for 1/2 the
calculated frequency as the second harmonic will be used.
The T-4X and T-4XB had holes on the right side for crystal socket, but
it was only installed in the T-4 (no PTO) transmitters.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Howard Traxler wrote:
Hi folks,
Just noticed: on the front of my t-4XC, way at the bottom and next to
the crystal switch, appears to be a crystal socket. Is that what it
is and when would
one make use of an external crystal--on the front panel? I don't
think it was on my T-4X. Maybe it's a mod?
Thanks and 73.
DE
Howard, WA9RYF
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