Either your wattmeter is lying, or you have one of two
worse problems..
1)
Check your TX with a spectrum analyzer. I'll bet that
your on-frequency power is down.
A wattmeter reads power on all frequencies - spurs or
on frequency.
I was bit by that oversight years ago.
A 6m 100w TX that used to be clean ended up as a comb
generator due to a leak in the roof creating corrosion in
the PA deck... The on-channel power was maybe 20w,
everything else was trash.
It was a miracle that we caught it before someone else
figured out where the grunge was coming from.
2)
Your diamond antenna may be hosed and giving you a
low ERP.
Mike WA6ILQ
At 03:28 PM 1/24/05, you wrote:
>Ok, I know this sounds silly, but my repeater is now hearing
>better than it transmits. Here's the setup, the the issue. I have
>a Maggorie (no comments) HiPro transmiitter running 2 watts into
>a Vocom Amp running 160 Watts into the duplexer, 130 out to the
>antenna, fed with 7/8" hardline into a Diamond Dual Band Antenna
>at 92'. VSWR is 1.1:1, with 130 watts forward and 1/10 watt reflected
>at an impedance of 52 ohms, (MJF 259).
>
>The receiver is a GE Mastr Pro ER-41 series receiver, tied to an ARR
>preamp at 24 db going through a two of the DB 4001-1 for filtering
>and finally into a set of TX-RX Duplexers, 3 cans pers side.
>
>I used to be able to hear the repeater nearly full scale for about
>40 miles with no problem. Recently at 20 miles away, it's barely at
>1/4 scale on my radio. This has been noticable with several users
>on the system, and my mobile just got a new antenna, all set and
>tested fine there, and other repeaters there is no problem. I can
>hear users nearly 60 miles from the repeater, but they can't hear
>the system.
>
>Is it possible something could be wrong on the duplexer end of it.
>I get no decense on the system, and receive audio is ok quality at
>60 miles, just less than full quieting.
>
>Any thoughts. Mybe just propagation.
>
>And the 160 watts from the Vocom amp was as low as I could go before
>I began to cause havick, so it does not like lower power.
>
>Mathew Thanks!
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