Noise Problem
On November 4th I ordered a Mod. 555 Scout Transceiver, a Mod 938
power supply (Ten-Tec no longer stocks the unit but they had a
few demo units available) and three band modules. All arrived in
good condition from the factory some days later.
I'm very pleased with the Scout except for a high noise level.
Broad band noise that sort-of moves around the band with a level
from S-5 to S-8 usually. Initially searched for a noise source
in the house but eventually I found the noise source is
the Mod 938 switch-mode power supply. When I powered the Scout
from a conventional 12 volt power supply I had NO noise. That
will solve the problem for use at home but I bought the mod. 938
supply because it's light and intended to use it when I take the
rig on trips
Has anyone else experienced a noise problem with the Mod. 938
supply? Has anyone come up with a correction? I tried the
following without seeing any improvement:
1. Wrapping the output leads around a ferrite core.
2. Wrapping the ac line around a ferrite core.
3. Bonding the power supply steel case to the transceiver
ground.
Andy Staiano, W1CR astaiano@midcoast.com
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