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Around 1 August (about two weeks ago) as a thunderstorm
passed over Rolla, many of us noticed that the 147.210 MHz
repeater no longer performed normally. Subsequent to that,
we removed and tested the preamp in the repeater cabinet
and testing by Peter (WB9KHR) showed that the preamp was
damaged. However, even with the preamp removed, some
users noticed repeater did not seem to transmit as strong a
signal as before.
.
Jeff (KD0JLM) who works at the PCRMC/Medical Office Bldg.
was able to inspect the antenna and he saw that it was
physically damaged. So, we arranged to replace it this
morning, and these pictures show what we found.
.
Thanks to Peter (WB9KHR) for "loaning" us his two-element
vertical, yielding 6dB gain (as opposed to the damaged
GP9N which offered 8.5 dB gain). After replacement, we
found that the resonator cans were grossly out of tune, so
did a quick tune to return the repeater to near-normal
operation.
.
We yet need to replace the preamp, do a full and proper
tune on the resonator cans, and observe how well the
repeater operates with the replacement antenna. Depending
on the results, we may either keep the replacement in service
or replace it with a new antenna.
.
Some work also needs to be done on the remote-base link
to 146.790 MHz to improve the received signal at the MOB
location.
.
Photos & report by Joe, K0OG, except the three photos by
Steve, N6RHQ, as noted.
.
Thanks to Jeff (KD0JLM), Steve (N6RHQ), and of course
Peter (WB9KHR) for their help today.
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