If I remember right, Motorola's spec is 92 watts out of the amplifier should
yield 75 watts out the back of the station. That translates into 0.9 dB
loss through the antenna network (isolator, LPF, etc.). Sounds like your 1
dB is about right...it may be a tenth or two higher since it's being used
out-of-band a bit.
--- Jeff WN3A
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ralph S. Turk
> Sent: Thursday, January 29, 2009 11:36 AM
> To: Repeater-Builder
> Cc: David Turk
> Subject: [Repeater-Builder] Micor Repeater
>
> Hi All.
> I am working on several Micor repeaters for use in Montana linking
> back to Tucson via the inter-net.
>
> These are standard 75 watt complete Micor stations.
>
> My problem is with the built in circulator that is feed by the PA
> prior to the duplexer.
>
> I have tuned the circulator using both a signal generator and
> spectrum Analyzer and used the tracking generator method.
>
> I can not get the loss down below 1 db. Is this normal?
> Other single stage
> circulators I have used in the past have had less the 1/2 db loss.
>
> Any Ideas. I suspect the harmonic filter is the problem but have not
> tried to take on apart to see.
>
> Ralph, W7HSG
>
>
>
>
>
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>
>
