Hello all
I have the Service Manual and have it printed out.
To confirm the symptoms, on 21 and 28MHz the counter settles around
33.030MHz and 17.206MHz on all other bands. Connecting an antenna I can
hear my signal generator on thes frequencies (sweeping the generator
through the 33 and 17MHz
Adrian,
Be aware of what is mentioned before by Garey - K4OAH. When changing the pots,
the 10V-DC will not be the same voltage as before. Changing that voltage
requires a full alignment of the TR7. So, before you start removings the pots,
warm up the TR7 for a minute or 10. Than measure
Also make sure the Fixed buttons on the front of the radio are not
depressed, and check that the PTO is indeed putting out a signal as
the synthesizer won't lock without PTO input.
73
Joe KC9LAD
At 10:06 AM 12/18/2009, you wrote:
Adrian -
Changing the pots to multiturn will have NO effect
Joe -
VERY good point!! I sometimes don't go far enough 'back'! :-)
ALL buttons on the front panel should be OUT to start!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
www.k4oah.com
Joe Pyles wrote:
Also make sure the Fixed buttons on the front
On Fri, 18 Dec 2009 10:06:44 -0500, Garey Barrell wrote:
Jim's suggestion to check the 24 VDC supply is a good one. A common
cause of failure is the top half of the DC-DC converter transformer
core falls off, or just becomes separated enough to cause the voltage to
drop. Looking at the top
Drake T-4X, T-4, bound copy= $7.50
plus shipping.
If you are interested, please e-mail me direct
TNXDoug W7LNB
dd...@centurytel.net
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