Aarggh! I've pulled out most of my hair on this one! To revisit something I asked about several months ago... I'm still having a problem with my UHF Micor mobile converted to repeater.
It is a T34RTA3000AA with power set at 20 watts. It is on 444.000 (T), 449.000 (R) and is producing a spur at 444.910. The spur is "clean", stable, and has good modulation, sounds identical to the main carrier. I have retuned the exciter filter per the book several times. No change. I swapped the KXN1024A channel element for one on a different frequency (443.750T/448.750R) and still had a spur 910 kHz above my carrier freq. Finally I tested both channel elements in a stock (unmodified) Micor and STILL have a spur 910 kHz above the carrier frequency! I lack equipment to accurately measure the spur power level, but this spur is some 80 or so dB below the carrier level, perhaps a bit more. The manual specifies spurious and harmonics below 85 dB so this MAY be within spec. but why would it always spur 910 kHz above carrier freq.????? This is an unacceptable level as it can be heard up to 5 miles from the repeater on line of sight paths (and this is causing a problem for some people). What am I missing? Is this normal behavior for a UHF Micor? I have juggled some numbers around and can't see why this would always be 910 kHz above the carrier freq. Thought I had a bad Micor until I found identical results in the second one... Any ideas? Should I forget about asking why and just throw cavities on the thing until I knock the spur down enough? Paul N1BUG Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/