Since the ARRL has the new "F" class (operating from an EOC) we have been
operating from our EOC where the antennas for the 2 rigs we use are within
about 40ft, and at the same height. Testing shows that around 3 watts is
seen on the wattmeter, using one antenna hooked to a dummy load and watt
meter. We use coaxial stubs and now you can see a very very small movement
on the watt meter. So, we use the stubs every year, although the bandpass
filter I'm sure would be better, more elegant way to approach the problem.
Ice and Dunestar make these and Dunestar has an "all band" box, but I'm
thinking it is around $600. We're just using 100 watts. I have not purchased
it, but George of Inrad has written a book on how to tackle the problem of
interstation interference. That is one of many things on my wish list.
73, Mike K9MI
---- Original Message -----
From: "dsthill" <dsthill@cbcbarbados.bb>
To: <yaesu-bounces@contesting.com>; <yaesu@contesting.com>
Sent: Monday, December 11, 2006 15 28
Subject: Re: [Yaesu] Ft1kMP loss of receive gain
> Hi Chris
>
> As someone who zapped an FT1kmpMK5 about a year ago, I think it's easier
> than you think. I hope you were using bandpass filters on this rig. It's a
> common mistake I think to not use them in some situations. I think though
> in
> a multi-transmitter setup, it's very important that each rig has necessary
> filters.
>
> I've actually measured 1 to 5 watts at the end of some of my coax cables
> when transmitting on another antenna.
>
> When I did my repair, it was just a single diode or a pair that were bad,
> but it was the labour that was "expensive" - $200+ for labout against $5
> for
> parts!!!!
>
> Hope it's not that bad!!!
>
>
> Dean - 8P6SH
>
>
>
> -----Original Message-----
> From: yaesu-bounces@contesting.com [mailto:yaesu-bounces@contesting.com]
> On
> Behalf Of G3SJJ
> Sent: December 11, 2006 5:48 AM
> To: yaesu@contesting.com
> Subject: [Yaesu] Ft1kMP loss of receive gain
>
> I am noticing a receive loss of around 10-12 dB. I have checked Antenna
> B and receive antenna inputs. They are the same.
>
> What I do notice is around 2-4 s units difference in indicated signal
> strength between main and sub Rx, which would indicate the problem is
> after the 1st mixer.
>
> We recently used the radio as a spotter in CQWW CW at G5W . Whilst it is
> unlikely, we could have zapped the front end somewhere.
>
> Anyone got any thoughts?
>
> Chris G3SJJ
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