I probably will turn it up more to see what happens. When I had it at
5 watts out we had no problems at all.
Over the 10 watts is when the noise was really bad. Now at 55 it works
and then it doesn't and then it works again.
So, yes I still have something wrong and maybe one of these days I
will get another grant and convince the club to buy another GE Mastr
II and and a new antenna and coax. Maybe that will fix it.
People we got radio from are not answering.
John
--- In Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>, "Chuck Kelsey"
<wb2...@...> wrote:
>
> I'd suggest turning the power up more. You have it set at about 50%
and the
> transmitter may be intermittently spurious at that level.
>
> Watch the wattmeter when things act up and see if anything changes
when you
> notice the desense happening. You can also pull the TX ICOM when the
problem
> is happening and see if the receive clears up on the local speaker.
>
> There are so many things that could be at fault - loose connector, bad
> antenna, problem with transmitter, problem with receiver, intermod
issue,
> etc.
>
> Ask the people you got the radio from if they had the same problem
with it.
>
> Chuck
> WB2EDV
>
>
>
> ----- Original Message -----
> From: "W3ML" <w...@...>
> To: <Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>>
> Sent: Monday, October 05, 2009 8:33 PM
> Subject: [Repeater-Builder] Re: Radio for repeater use Response to
Tom's
> comments
>
>
> > Hi Tom,
> >
> >
> >
> > I did crank up the power to 55 watts out of radio and that gives
me 45 out
> > of the duplexer. Decided on this wattage until I can figure the
problem
> > better. It is working better than before, but still having trouble.
> >
> > So from what you said about power coming out duplexer, the
duplexer must
> > still be okay.
> >
> > However, during the day today there were 3 hams talking and they said
> > (later) that all of them were loud and clear. But, when I got home
and
> > tried to call one of them, he was covered in noise.
> >
> > Later one of the others called in and he would be clear, then the
repeater
> > would cut out and his signal would be gone, then it would come
back with
> > noise on his signal and then clear again.
> >
> > Then the other one came in with a lot of noise, then he would come
in with
> > a little noise and then no noise at all and then back again
through this
> > cycle.
> >
> > This cycle of noise and then no noise is driving me crazy.
> >
> > The set up is this:
> >
> > GE Mastr II VHF mobile running into a 6 cavity duplexer set to our
freqs
> > with a service monitor prior to bringing it here.
> >
> > There is a bandpass filter on the receive side after the duplexer and
> > before the radio.
> >
> > We have used 1/2 inch hardline going up to the used G7-144.
> >
> > Then only thing I can think of is the radio is bad, the antenna is
no good
> > and the coax is shot.
> >
> > Now, the radio was given to us by a group that had used it, but
decided to
> > replace it with a Kenwood.
> >
> > I am thinking that they had the same problem and that is why they
gave it
> > away.
> >
> > Any advice would be greatly appreciated.
> >
> > 73
> > John, W3ML
> >
> >
> > - In Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>, W9SRV <tgundo2003@> wrote:
> >>
> >> Ok-
> >>
> >> 1. Where are you checking the swr at in the chain? Make sure you
bypass
> >> the duplexers to check the antenna, the cans can throw off the
reading on
> >> some meters like you describe using. If you are less than 1.5:1 I
would
> >> not worry too much more about it, any reflected power will get
eaten up
> >> back in the cans. If you are really concerned about protecting
the TX put
> >> a circulator in-line with it.
> >>
> >> 2. Make sure all the interconnecting cables are good shielded and
not
> >> foil/ braid type. RG-213 and RG-400 are good choices, though
there are a
> >> few more.
> >>
> >> 3. Terminate into a good dummy load. Set you output power to
80-90W. Then
> >> run thru the duplexer and check the power coming out of the cans.
You
> >> should see something like 60-70w, depending on the spec of the
duplexer.
> >> If your seeing much less than you may have a duplexer tuning issue.
> >>
> >> Figure out the real problem, let the radio run at a real spec power
> >> output, than absorb the title of "far lord" as every one thanks
you for
> >> giving the repeater twice as many s-units. (then be prepared for
the next
> >> round of complaints that become your problem)
> >>
> >> Tom
> >> W9SRV
> >>
> >> Sent from my iPhone
> >>
> >> On Oct 4, 2009, at 5:46 PM, "W3ML" <w3ml@> wrote:
> >>
> >> No, except when it was at the 2o watts the swr was almost 1 and
someone
> >> said that was the problem causing the de-sense. So we were afraid
to run
> >> it higher.
> >>
> >> Like you said guess it was only a problem from running too little of
> >> power.
> >>
> >>
> >> Thanks and 73
> >> John
> >>
> >>
> >> --- In Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com>, W9SRV <tgundo2003@> wrote:
> >>
> >> You answered your own question :
> >>
> >> "So it appears that this radio, which is a GE Mastr II mobile,
doesn't
> >> like to run at the lower wattage of 10 to 20 watts out."
> >>
> >> 110w radio will not be stable at 10-20w. If you look at your
output on a
> >> spectrum you probably have spurs all over the place. Any reason you
> >> cannot run it at least 1/2-2/3 power?
> >>
> >> Tom
> >> W9SRV
> >>
> >> Sent from my iPhone
> >>
> >> On Oct 4, 2009, at 4:46 PM, "W3ML" <w3ml@> wrote:
> >>
> >> So it appears that this radio, which is a GE Mastr II mobile,
doesn't
> >> like to run at the lower wattage of 10 to 20 watts out.
> >>
> >>
> >>
> >>
> >>
> >> ------------------------------------
> >>
> >>
> >>
> >> Yahoo! Groups Links
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
