At 7/5/2005 09:51 PM, you wrote:
>Just the transmitter, I took the amp offline for the test. So with just
>five watts I seen the spurs on the SA.
>
>Mathew
So the spur(s) are coming from the exciter. How far down are they from the
carrier (dBc)? Is there one also near 157.87 MHz? & finally can you post
a picture of the S.A. display?
My guess at this point is that the exciter's interstage filtering isn't
adequate. A simple pass cavity between the exciter & P.A. should clean it
up, as the rejection of a typical 1/4 wave coaxial pass cavity 8.5% away
from resonance is pretty high.
Too bad this didn't come up before Dayton - could have packed a can in the
trunk too.
Bob NO6B
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