The repeater housing (just the GR300 repeater) is bolted to a metal
shelf, which inturn is bolted to the repeater cabinet (the entire
repeater, duplexer, Bp filter, Bp cavity, etc.
I have two ferrite snap-together beads (very loose on the wires to
the fan. Meaning 1/2" hole and the two wires for the fan going thru
only once, not wrapped around several times. I do have a mic
plugged into the Tx radio all the time. The fan came with the
repeater (installed) when I bought it used. I am using only "double
sheilded" coax inside the repeater cabinet.
Rod
Most common and forgotten is the noise is most often caused
by the fan shaking something that is loose.
A loose connector, a loose connection, a pressure fit
connection, a bad metal to metal contact on a cover, case,
or cabinet, and so on. The fan could also be shaking an
inductor and phase modulating the rig.
It very rarely is an actual RF noise generated by the fan.
ESPECIALLY in a repeater.
The repeater, if constructed properly, should be VERY immune
to RF sources from around the equipment. The RF input system
in particular has to be very well shielded.
Although possible, it is actually unlikely to actually be RF
radiation from the fan.
73 Tom
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