Bruce, and all 91 repeater users:
The W4DFU 146.91 repeater has had some trouble over the past several
months with a poor wiring connection from the 13VDC power supply to the
radio transmitter power amplifier. The connection is made using #12
automotive grade stranded copper wiring to the block connector on the GE
Master Executive radio. These connections are notorious for building up
corrosion and causing intermittent connections. Jiggling the wire to
restore power was no longer sufficient to fix the problem.
Last night, Todd Sherman and I spent about 3 hours cleaning and replacing
wiring. A new AC powerline cord is installed to power the repeater
cabinet and all the radio and electronic equipment inside. The old cord
had become cracked and crumbled due to age and required replacement.
To check the radio power cable, the repeater and Astron power supply was
turned off. The DC power cord was inspected and the problem was
determined to be with the ground (black) wire inside the block connector.
That wire was cut near the connector and desoldered from the connector.
The wire was stripped back and inspected and determined to be good. It was
soldered to the connector with fresh solder. Further inspection of the
bad connection showed that it apparently only made contact through solder
and it had obvious signs of excessive heat such as warped plastic.
Corrosion was evident on both the wire and connector pin.
After re-installing the connector block and turning the power back on, the
power draw on the power supply was noticed to have been reduced from 2
amps to 1 amp during repeater transmissions. This should help with some
of the overheating problems with the corrosion and corresponding increase
in resistance having been cleaned and soldered.
A check of the repeater last night seemed to indicate that all was working
well. It was also still working as of this morning.
If you have any further reports regarding repeater problems, please let me
know. The receiver is still experiencing some sensitivity problems, and
that may be a project for later. As for the repeater signal output,
listen and check your S-meter and see if the 91 is still as strong as you
remember its signal has been.
On Mon, 8 Sep 2003, Bruce H. McIntosh wrote:
> Seems that the 2m repeater has bowed out; I'm unable to key it up from
> two different radios.
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