Have you guys tried the Simrex (formerly GLB) helical resonator pre-amp? It's great for repeater applications. Very selective and moderate gain. If you're using Bp-Br type cans you don't need any further filtering. http://www.simrex.com/site/products/preselector/Preselector1.pdf
Hi Dan,
I have used several of them in the past. While they provide lots of
preselection, they aren't great where NF is concerned. I believe a
simple 2 section BP Cavity and GaAs device to follow would easily beat
the GLB in performance; both in preselection and NF.
Kevin
Dan Hancock
At 12/17/2005 10:15, you wrote:
I've got the same setup. I also have a 4-section
Celwave bandpass filter between the duplexer and
preamp. I found that the 17dB gain was way too much
for the receiver, and the noise level increased
dramatically, to the point that I had to tighten the
squelch
At 12/17/2005 11:07, you wrote:
Bob M. wrote:
I found that the 17dB gain was way too much for the receiver, and the
noise level increased dramatically, to the point that I had to tighten
the squelch settings.
Think about this for a minute, if the noise level increased, the squelch
circuit
At 12/17/2005 10:21, you wrote:
At 10:15 AM 12/17/2005 -0800, you wrote:
I found that the 17dB gain was way too much for the receiver
---That's one reason I swear by Chip's stuff for over 15 year.
He places stability and noise figure over gain. The result are preamps with
extremely low
PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Sunday, December 18, 2005 8:36 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] UHF Preamplifier
At 12/17/2005 10:21, you wrote:
At 10:15 AM 12/17/2005 -0800, you wrote:
I found that the 17dB gain was way too much
Think about this for a minute, if the noise level increased, the squelch
circuit would have seen MORE noise and rammed the squelch closed.
What actually happened is, adding a better device in front of the
receiver lowered the receivers total noise figure, decreasing the noise
in the
I am currently running a AR2 preamp on my MSF5000 repeator with a
cellwave 526 duplexor. I was thinking if uogrsding to Lunar preamp,
but can find no reference to them on the internet. If anyone has any
contact information it would be appreciated.
Thanks
Mark
KB1IOZ
Yahoo! Groups
mdnosliw wrote:
I am currently running a AR2 preamp on my MSF5000 repeator with a
cellwave 526 duplexor. I was thinking if uogrsding to Lunar preamp,
but can find no reference to them on the internet. If anyone has any
contact information it would be appreciated.
I haven't heard anything
I've got the same setup. I also have a 4-section
Celwave bandpass filter between the duplexer and
preamp. I found that the 17dB gain was way too much
for the receiver, and the noise level increased
dramatically, to the point that I had to tighten the
squelch settings. The sig strength metering
At 10:15 AM 12/17/2005 -0800, you wrote:
I found that the 17dB gain was way too much for the receiver
---That's one reason I swear by Chip's stuff for over 15 year.
He places stability and noise figure over gain. The result are preamps with
extremely low noise figure, unconditional
Bob M. wrote:
I found that the 17dB gain was way too much for the receiver, and the noise
level increased dramatically, to the point that I had to tighten the squelch
settings.
Think about this for a minute, if the noise level increased, the squelch
circuit would have seen MORE noise and
Subject: [Repeater-Builder] UHF Preamplifier
I am currently running a AR2 preamp on my MSF5000 repeator with a
cellwave 526 duplexor. I was thinking if uogrsding to Lunar preamp,
but can find no reference to them on the internet. If anyone has any
contact information it would be appreciated
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