Hi Possib. a high power C.B. operater.
- Original Message -
From: skipp025
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, February 26, 2009 9:51 AM
Subject: [Repeater-Builder] Re: Interference or Intermod ( ? ) Helphere
goes
I remember that Neutec Unit... saw it on Ebay.
Mike
Do you have any analog television stations on channel(s) 11
through 14 in the area still on the air?
If so, I might suspect an IF image might be possible. I had
the same type of problem here from channel 13 getting into a
number of Icom receivers.
I had to notch the image frequency of my IF to get rid of
it.
s.
> "Michael Ryan" wrote:
>
> My recent efforts at putting a 220 repeater on the air here in western
> Florida have been mildly succesful. I am using a Neutec designed
repeater.
> ( I know there are some uhf and vhf models around, this one is on 220, a
> RANGER brand ). The repeater is open access. And runs quiet all day or
> night, nothing cracking the squelch at all. But during times when
there is
> a conversation going on after a few minutes a rather nasty signal
captures
> the repeater sometimes in short bursts, sometimes much longer.
"Sounds like
> someone talking into a reverb chamber.." I had been using a Mirage
brick
> amp in the rack, but suspected that this amp might be the problem, some
> oscillation or internal mixing of some sort. This turned out not to
be the
> case, the amp though still in the circuit is OFF but we still get the
> garbage. When the amp would be ON, and I would sometimes hear this
stuff
> start, and I could turn OFF the amp an it would stop. But shortly later
> even with the amp OFF, it is back.very odd that it would appear to me.
>
> Now, all cables in the rack are RG-400. Every one in the rack. Half
inch
> hardline runs to the antenna, though there is a splice with a double
male N
> connector as I recall. The Neutec unit does about 25 watts output
but I have
> it cut back to about 10 watts thinking it will run cooler. Thus
with the
> small brick amp it was doing about 65 watts output to the Telewave 4
cavity
> duplexer.
>
> While at the site tonight, I could hear something getting into the
recvr.
> The repeater was UP, but no one talking at that moment. Again,
nothing on
> it's own ever appears to break the squelch. The noise was heard
through the
> repeater's on board speaker, meaning it was coming through the antenna /
> recvr and not something produced in the rack I would assume.
>
> There is a cel tower about 1,000ft away and another tower with ( who
knows )
> how many other users, another 500ft further away. Based on this
little bit
> of info what would the masses suggest in first FINDING the offending
source
> if is indeed intermod? Then, is there much than can be done short of
> moving my machine? Any ideas or suggestions?
>
> n Mike
>
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