COR question

[Jim AB3CV]

I've recently been upgrading my station with the KPA500 and a new 80m
vertical. Up to now my 80m antenna has been in the same location and 60ft
from my K9AY but only running 100watts.

Now that the KPA500 has been added and the vertical improved a bit I've
been hearing some clicking of relays when transmitting. I finally
realized that they are probably the Carrier Operated Relays on the RX ANT
input.

It doesn't always happen but it never happened before with the same antenna
locations and only 100w. I'm a bit uncomfortable operating like this and
wondering what to do about it. I assume that ignoring it isn't a great idea.

One option is to provide more separation of the antennas. Another is to add
some relays to switch out the RX ANT on KEY DOWN but that would kill QSK
and I'd rather not do that. A third way would be to add some PIN diode
attenuation on KEY DOWN; I'd need some examples of implementation.

Any others?

What do others do in this situation?

Thanks

Jim ab3cv
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[Dick Dievendorff]

How about a KD9SV Front End Saver? I'm considering one for my station.

http://www.radio-ware.com/

http://www.k0to.us/HAM/Articles/KD9SV%20Front%20End%20Saver%20Feb%2097%2073m
ag.pdf

CQ magazine, Feb 1997.

73 de Dick, K6KR


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Jim Miller
Sent: Friday, November 23, 2012 4:58 AM
To: Elecraft Reflector
Subject: [Elecraft] COR question

I've recently been upgrading my station with the KPA500 and a new 80m
vertical. Up to now my 80m antenna has been in the same location and 60ft
from my K9AY but only running 100watts.

Now that the KPA500 has been added and the vertical improved a bit I've been
hearing some clicking of relays when transmitting. I finally realized that
they are probably the Carrier Operated Relays on the RX ANT input.

It doesn't always happen but it never happened before with the same antenna
locations and only 100w. I'm a bit uncomfortable operating like this and
wondering what to do about it. I assume that ignoring it isn't a great idea.

One option is to provide more separation of the antennas. Another is to add
some relays to switch out the RX ANT on KEY DOWN but that would kill QSK and
I'd rather not do that. A third way would be to add some PIN diode
attenuation on KEY DOWN; I'd need some examples of implementation.

Any others?

What do others do in this situation?

Thanks

Jim ab3cv
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html