Transmitter Spur

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arlojanis
Posts: 1055
Joined: Mon Jan 28, 2002 4:00 pm

Transmitter Spur

Post by arlojanis »

I have a VHF repeater that seems to be working normally. However, there is an intermittant spur 7 mhz above the repeater frequency. When the spur occurs, it is there continuously, but it slowly drifts several hundred kilohertz. The modulation on the spur is very excessive. Only the repeater audio is heard on the spur. The spur can be heard for 20 miles or more. Why would the modulation increase on the spur?
"The world runs on radio."
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Will
Posts: 6823
Joined: Tue Sep 04, 2001 4:00 pm

Re: Transmitter Spur

Post by Will »

Are you trying to run the repeater transmitter at reduced power? Most RF amplifiers are Class C stages and go spurious when run out of the curve.
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arlojanis
Posts: 1055
Joined: Mon Jan 28, 2002 4:00 pm

Re: Transmitter Spur

Post by arlojanis »

It is running full power.
"The world runs on radio."
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Jim202
Posts: 3610
Joined: Sun Sep 09, 2001 4:00 pm

Re: Transmitter Spur

Post by Jim202 »

How about a hint on make and model number. Some one on here might just have some feedback for you.

Jim
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