[ETS/PARC List] ETSNJ Motorola Repeater is better than ever!

[w2wiq1 at juno.com]

HI LEN & RICH:

TNX FOR TAKEING ALL THAT TIME AND EFFORT TO RESOLVE THE DESENSE PROBLEM.

WE HAVE HAD OUR PROBLEMS WITH CABLES IN THE PAST.
SOME TIMES YOU DO NOT REALIZE HOW CRITICAL THEY ARE IN A REPEATER SYSTEM.ALSO IF YOU HAVE GOOD PROPERLY MADE CABLES THEIR LOCATION IN RESPECT TO OTHERS SHOULD NOT MAKE A DIFFERECE.IF IT DOES YOU MUST SUSPECT THERE IS A PROBLEM WITH ONE OR MORE.

TNX AGAIN FOR ALL YOUR EFFORTS.

BEST 73 

WALTER-W2WIQ


---------- Original Message ----------
From: "lengriff at optimum.net" <lengriff at optimum.net>
To: <etslist at mailman.qth.net>
Cc: k2vhw at verizon.net
Subject: [ETS/PARC List] ETSNJ Motorola Repeater is better than ever!
Date: Tue, 11 Jul 2017 16:12:46 -0400 (Eastern Daylight Time)

    We ( Len, WB2HKK, and Rich, KB2LLM ) went to the site today to
investigate the receive problem.



There will be a detailed presentation at the next meeting.



There were 4 separate areas that became the solution:



1] The receive preamp added TOO much receive gain! I had tuned the Maxtrac
for about 1.5uV sensitivity itself.

    The preamp resulted in about .08uV sensitivity. This just caused
excessive de-sense from the transmitter.



2] The BNC cable I had used for the receiver to duplexer connection was a
piece of CR*P!

    I had fabricated a BNC to N cable from RG1428 Teflon cable to replace it
 and it was perfect!



3] The duplexer connections to the transmitter were re-routed to move them
away from any receive cables.



4] I touched up the duplexer for better transmit reject on the receive side.



When done, we could turn the transmitter on / off with NO change in receive
signal.



The result is we have HANDHELD coverage almost everywhere!



ENJOY!

Len

WB2HKK
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