At 07:47 PM 08/18/09, you wrote:
I have heard of repeater owners using pre-amps on the receive side
of the duplexer and adding 1 pass-reject cavity after the preamp and
placing a pre-amp on the pass reject cavity to enhance more receive.
Does this work or is it a myth?
Artie
k2aau
Depends on
Mike,
Pre-amps are fine if you need to reduce feedline and connector loss, for those
lucky few that have antennas way up on commercial towers and have significant
loss. Otherwise, nada. Signal to noise is not improved and can be effected
negatively. Pre-amps can also be easily overloaded by
GM Lee - Tks for input.
I don't have an analyzer here. Best I can do is an old military AN/PRM-10 GDO.
I think
(since I never venture up into that region) it goes up to a couple hundred mhz
so will
eventually try that. I'm primarily interested in moving all this estate stuff
out of my garage
at
This particular commentary seems somewhat inaccurate in saying signal
to noise cannot be improved...as even GE offered a factory preamp for
the Mastr II in VHF and UHF. The sensitivity spec improvedThey
DID NOT suggest using it in a station environment as THEIR preamp
overloads very easily
In my quest to get rid of desense with
the Quantar, someone mentioned that having
the 'wrong' antenna could make the desense
worse.
I've got a DB-224 - not the 'ham' version,
but the 150-160 MHz version, and there is
a bit of a mismatch.
Has anyone ever had any desense that they
could attribute
Most of the replies so far indicate a failure to read the original
post *SLOWLY*. TWO preamps, one after the duplexer and then another
one after a pass-reject cavity. This sounds wrong to me under
any circumstances. The pass-reject cavity should have at most 1 or
2 db of loss, adding yet another
k2aau wrote:
I have heard of repeater owners using pre-amps on the receive side of the
duplexer and adding 1 pass-reject cavity after the preamp and placing a
pre-amp on the pass reject cavity to enhance more receive.
Does this work or is it a myth?
It does work on UHF. I have no
What frequency pair in 2m do you have? Have you thought about putting ss bollts
through the bottoms and tops of the loops to bring the db-224a down in
frequency?
73 de N5NPO
Norm
- Original Message -
From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
To:
Hi Norm,
It's 147.10/70, so at least it's up high in the band.
I thought about adding some metal to the loops, but
figured I'd ask around here to see if it's been done
before.
Thanks,
Tim
--- In Repeater-Builder@yahoogroups.com, NORM KNAPP nkn...@... wrote:
What frequency pair in 2m do you
Hi all
i am looking a COR board that i could use between 2 walkie-talkie that would be
used here as a replacement for my regular repeater in case of accident.
i have seen this many years ago,an amateur built his own repeater with 2
talkie's,simple and efficient.
So maybe someone know where i
hi Gervais I have such a item .. its an alinco controller it was
ment to have 2 HTs on it .. or even one and then act as a 'parrot'
repeater
if you would like more info email me off list
On Wed, Aug 19, 2009 at 5:19 PM, gervaisve2...@hotmail.com wrote:
Hi all
i am looking a COR board that
Have you checked the repeater for desense without the antenna installed? As in
most commercial repeaters they are usually designed for larger spacing than 600
kHz. Check it without the antenna and all open ports terminated with a 50 ohm
termination. Then add the antenna and look at the
MFJ make one, check their catalog...
Depends on a few things... do you want the repeater
to key on received voice/speaker volume level detection
or from a logic level change like a carrier squelch or
CTCSS (PL) detection logic?
Voice audio detection can work OK if you consider the
key up delay in the repeat path, but using two
Our club's MSR-2000 repeater recently ate it's PA, a TLD-2601A.
Actually it went intermittent on us and several folks have gone over it
with the magnifying glass and reflowed most of the major solder joints
to no avail.
That's a low split, 100 watt, continuous duty PA. If anyone has one
Desolder the flat gold plated transistor leads.
Clean the black residue at the gold - tin interface.
Resolder the transistor leads after removing any gold left by tinning
the lead and removing the solder a few times.
Gold embrittlement is very common.
73
Glenn
WB4UIV
At 10:25 PM 8/19/2009, you
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