Dave,
You have done all of the right things, except you did not mention how much
deviation your IDer is causing, or how pure its signal is.
Many IDers deviate much more than is necessary. My personal preference is
something around 1 kHz, and no more than 2 kHz deviation. When I set up an
IDer,
I first set the code speed as slow as it will go, like one word per minute, so
that a Morse dash lasts for several seconds and makes it easy to set the
deviation.
If the IDer output tone is distorted, the apparent deviation is much greater and
may indeed cause the sidebands to extend into an adjacent channel. You can
check
the purity of the tone with an extremely low speed setting, as noted above.
Another thing to look at, if you tweaked the PA, is to make certain that your PA
is not generating any spurious signals. Since you did adjust the duplexer
tuning,
the load impedance seen by the PA may have changed enough to cause PA
instability.
Finally, is it certain that your repeater and the complainers' radios are
exactly
on frequency? Even if your repeater output is right on frequency, one or more
of
the complainers might have a radio that is off far enough that it picks up a
fringe of your channel.
73, Eric Lemmon WB6FLY
Dave VanHorn wrote:
> I've just had a couple of complaints of splatter on a repeater that I now own.
>
> We overhauled it, retuning the cans, and setting the TX and RX back
> on frequency, replacing some cables that were dubious, but nothing
> really major found. The cans weren't far off, but I got another 6dB
> rejection out of them, and about 1dB on pass.
>
> The complaints are that they can hear the repeater ID (which is
> distinctive) when tuned to the output of another repeater, 30kHz away.
> The other repeater is about 17 miles straight line, outputting 50W
> into a 6dB antenna at about 200' agl.
> In one case, our repeater is more or less in line with the path to
> the other one, in the other case it's about 1mi north, more or less
> 90 degrees off the path.
>
> The receivers are Kenwood TM-V7As, both of the guys live very close
> to the repeater, <1 mile.
> I don't know the antennas in both cases, one is a 1/4 wave gp at
> about 20' agl. Both are omni antennas AFAIK.
>
> Our system is 15W into a 6dBi antenna, at about 80'.
>
> I can't hear anything at my QTH, which is about 2 miles, even with
> the squelch open.
>
> Is this likely a case of "newly active repeater" getting into not so
> tight receivers more than it used to, simply because it's now active?
>
> I've listened to it about 1/8 mile away, with my TM-V7a in the car,
> and heard nothing.
>
> I can pull the system down and put it on the SA, but I'm not
> convinced this is "real".
>
> Any suggestions?
>
>
> Yahoo! Groups Links
>
>
>
>
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