That's a hard question to answer. Some preselectors are based upon the
physical package used for mobile duplexers, and may work just fine- but
they are not flexible. I prefer to use an 8 inch bandpass cavity that I
can tune for almost any selectivity and insertion loss that I want. If
You let the bp/br duplexer take care of the in band problems and then use a
band pass cavity that does not have to have very much loss to take care of
the out of band problems if needed.
de KU4PT
Or even better, run split antennas with a Tower Top Amp if you are on a 300
ft or better tower.
Before you fix a receive problem be sure there is a problem. I have used
ARR GasFet preamps for some time with excellent results. Be sure you have
a filter or cavity ahead of the preamp, and that you do not have so much
out of band energy getting to the preamp that it goes into overload and
Will it be better to use a bandpass can or an actual preselector? I'm trying to get the NF when the line was swept so I can give it to you to see if I do need a preamp. As far as I can remember it was pretty good I just wanted to improve on it. Thanks.Eric Lemmon [EMAIL PROTECTED] wrote:
Adding
Howdy Dino regarding the preamp and
filter.
First thing that sticks out is sweeping
the line. This is a good figure of merit for an antenna system and
cable. The process involves running a sweep across the band and a
graphical representation of VSWR across the band. The unit of
I'm thinking about putting a receiver preamp in our system. Any words
of advice from anyone would be greatly appreciated. Brand, model, etc.
If you ahve one for sale let me know too. Thanks.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
At 04:01 AM 12/5/03 +, you wrote:
I'm thinking about putting a receiver preamp in our system. Any words
of advice from anyone would be greatly appreciated. Brand, model, etc.
If you ahve one for sale let me know too. Thanks.
Look at http://www.repeater-builder.com/rbtip/supplyindex.html and
I have had great results with http://www.advancedreceiver.com/index1.html
on My 444.750 Repeater had a nearby Lighting strike damage it not the
receiver , Sent
it in and they repaired it for about $ 15.00 and sent it back right away.
73 De Don KA9QJG
Your use of Yahoo! Groups is subject
Adding a preamp to some repeater systems does not always make it hear
better; sometimes the receiver becomes more sensitive to overload,
intermod, desense, and has a higher noise level. You can mitigate some
of these problems by placing a bandpass cavity immediately in front of
the preamp.
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