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Re: Another interesting preamp story

Joe K0VTY wrote:

...Separate ground shielded coax for the DC to each unit...

Wayne W9AE replies:

Has anybody found that this is necessary for SSB Electronic preamps?  I 
power my 2m and 70cm SSB preamps with (unshielded) rotor cable 
conductors.  I never get desense on linear transponders, but sometimes I 
hear a burst of noise on the downlink when I transmit at high power in 
FM mode.  The problem goes away when I reduce the uplink power.  It only 
occurs when the antennas point in certain directions.

Wayne Estes W9AE
Oakland, Oregon, USA, CN83ik
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