[1000mp] Malfunction of 1000MP Mk V antennatuner

[Hans Remeeus]

Two weeks ago I had a malfunction of the Mark V antennatuner. While tuning
with low power of 25 Watts the tuner made a curious noise and it went to
smell (stink). After that I could not tune properly, even not a dummyload.
The curious noise kept on.

The failure was a coil in the antennatuner of the Mark V, which was built to
close to the PCB.

During tuning there happened to be a flash-over (a short circuit between the
coil and the PCB) which apparently caused the smell and the malfunction. On
the upper side of the antennatuner we could not see anything which could
have been the reason. However on the underside of the antennatuner we could
see a kind of short circuit (a black spot) of the PCB.

We mounted the coil more upwards from the PCB. In this way there is no short
circuit possible between the coil and the PCB. We cleaned the PCB and
checked the other coils.

The antennatuner is working again!

Perhaps this information is of your interest.


73, Hans Remeeus.
Ham Radio: PA1HR
www.remeeus.nl

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