--- In [email protected], "Scott Zimmerman"
<[EMAIL PROTECTED]> wrote:
>
> Guys,
>
> I think you're missing one detail here. 146.73 minus 146.85 is
1200 KHz.
> Twice the
> typical 2 meter split of 600Khz.
>
> I'm not sure EXACTLY why it's happening, but the math here has BAD
written all over it. Anytime you deal with multiples of your input
to output frequency separation, it's not a good thing.
Yet another reason I'd like to weigh anchor and find a new site.
The only sort-of offer we had was a naked water tower out in the
country a bit, at $2000/month. Other than that last bit, it sounded
like a deal.
> I wonder if the two repeaters are using the same PL tone? If so,
does one, or both encode that tone as well?
Yes and yes, but this was not always the case.
In the old days, the 85 ran no PL at all. The 73 still encodes, but
does not require. At this point, the 85 encodes, and optionally
can require.
In the old days, the 85 was deaf as a post, with bad antenna, bad
feedline, maggiore TX/RX, mistuned, astron power supply, no backup,
and a "Daiwa" mobile amplifier (with the FM/SSB switch).
The 73 in those days was a TKR-720 with ARR preamp, sinclair "brick
wall" VHF bandpass filter, wacom cans, and a good 4 bay dipole.
At that point, the 85 never had the problem, but 73 would
intermittently. Folks were blaming the 85 for the problem, claiming
that they could key up the 85 and the problem would start up on the
73.
Lots of experimenting was done on the 73, but at this time the 85
was a "flying dutchman" and nothing could be done with it.
In more recent times, the 85 has been totally rebuilt. The only
remaining components are the wacom cans, and the cabinet. It's all
daniels gear, which is exceptionally clean on transmit. Current
configuration is a no-name dual-band vertical, MFJ band splitter
(the comet one burned up), Sinclair "brick wall" filter, wacom cans,
Daniels VT-30 tx amp, and VT-2/VR-2 radios.
The 73 has not heard the noise since going to the kendecom radios,
but it didn't hear it very often in the first place, and typically
only during rainy weather. I wouldn't say that it's definitely not
hearing the noise at this point. Recent adjustments by a different
tech committee have also left it rather deaf.
> I think Ken is on the right track with an audio delay causing a
howl.
It's not a howl, very hard to describe without you hearing it.
>It's not a necessity however because of the RF delay in the
possible feedback path. Realize that even at the speed of light (in
free space) RF transmission and reception are not instantaneous.
At about 1000' that delay won't be doing anything in the audio
domain.
> I think your best bet is to find a different frequency or location
for one of the repeaters if possible.
Would love to.
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