Dan -
Your symptom is due to the phase-locked loops failing to lock.
First step is to at least unplug and re-plug each card and connector, preferably applying liquid
DeoxIT to all contacts as you go.
If this does NOT clear up all your problems, check the DC voltages, especially the -24 VDC, and
report back!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
dpetersen tds.net wrote:
Hello Group:
I am the recent recipient of a Drake TR7 with the PS7 power supply. It has evidently been in its
original carton since 1987 and is in pristine condition. I fired it up to check it out and all
seems well except on 20 and 10 meters. When switched to those bands the frequency (for 20 meters)
goes to around 11.5 MHz and starts tuning upwards rapidly, finally slowing to a stop after about a
minute. 10 meters starts at about 26 MHz and scrolls the same way. I can hear signals go by as it
scrolls. All other bands seem OK.
Any ideas from the think tank?
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