[ICOM] Receive level dropping-rig or antenna system issues?

[John G.]

No amplifier, but thanks for the suggestion.

73 John AF5CC

----- Original Message ----- 
From: "Joe K I 5 F J" <jen1joeo at yahoo.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Sunday, March 24, 2013 9:09 PM
Subject: Re: [ICOM] Receive level dropping-rig or antenna system issues?


John,
If you have an amplifier in line, the issue could be
a poor T/R relay contact. Often the spring becomes
weak resulting in a intermittent high resistance
during receive.
My 22 year old SB-1000 amplifier now has a double
spring on the T/R relay.

73
Joe O, K I 5 F J
NNNN




________________________________
 From: John G. <af5cc at fidmail.com>
To: ICOM Reflector <icom at mailman.qth.net>
Sent: Sunday, March 24, 2013 1:03 PM
Subject: [ICOM] Receive level dropping-rig or antenna system issues?

Here is a message I posted a few months ago about the receive level dropping 
off at times in my Icom 706 original:

"I have noticed for the past few months that the receive seems to drop
at times on certain bands-it started on 12m and now occurs on 15m as well. 
If you click the key or mic to quickly put it into transmit the receive 
comes back. To me this sounds like a dirty relay or one that is going bad"

Now here are some additional details, it seems to be occurring on other 
bands as well. 17m at times, and was doing it on 30m last night. Someone 
suggested to me that it could be a problem in the antenna system as well. I 
did some checking this morning, and have determined that it isn't in the low 
pass filter, the MFJ tuner, or any jumper coaxes in the shack. It would have 
to be in the feedline going to the G5RV, or the balun there. I haven't had 
time to change out the coax run yet.

I have also noticed that on 12m and 15m the receive will come back up by 
itself at times. Sometimes it is a quick drop down and come back several 
times in succession. Would a relay problem do this?

So, with this latest information, what is the better guess as to the 
problem-in the rig or the antenna system?

73 John AF5CC

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----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html