John,
I am using the 6 position antenna relay design that appeared in QST a
couple years back by Bill Smith (call?). FAR Circuits has a board and
the 12 volt relays are American Zettler, Inc. AZ755-1C-12DE.
You may want to search for the original article, it had ARRL test data
on the SWR and loss and there was some information about where you could
obtain the relays without encountering a high minimum order. I did
order 24 of them for my purposes, and used the 24 volt relays, but your
situation would likely use the 12 volt version.
73,
Don W3FPR
John [K7SVV] wrote:
Don,
I am going to be installing a simpler antenna switching system
here. Mine will be keyed off of the 12v power supply. When it is turned
off, the antennas on my two operating positions will be switched from
rigs to ground. The relays will be located outside in a weather proof
box attached to 8' ground rods. My only problem is choosing the spdt
relays. May I ask what type and brand of relays are you using?
John [K7SVV]
----- Original Message ----- From: "Don Wilhelm" <[EMAIL PROTECTED]>
To: "eKotz" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>; <elecraft@mailman.qth.net>
Sent: Monday, June 18, 2007 8:43 PM
Subject: Re: [Elecraft] KPA100 Power Malfunction
Ed,
For the future, consider your antenna situation carefully. When the
station is not operational, all my antennas are grounded (via relays)
and the K2 is connected to a dummy load. I do have an extensive
antenna switching system here (not yet complete, but almost there)
which relies on the Elecraft KRC2 along with remote relays to select
the antenna to be used for each band - yours may be less complex, but
consider a switching system to ground the antennas not in use and
connect the K2 to a ground (or better a dummy load) when the K2 is not
powered on.
73,
Don W3FPR
eKotz wrote:
Don,
You were spot on. The SWR Bridge diodes D16 and D17 had failed.
The diodes arrived today in the mail, I replaced them and my K2 is
up. Thank you very much for your help.
73,
Ed - AD7GR
K2 #6050
Don Wilhelm wrote:
Lack of power control with the KPA100 installed normally points to a
failure of the KPA100 wattmeter circuit.
Start with replacing the 1N5711 diodes D16 and D17...
If your KPA100 was working at one time and there is *any*
possibility that you encountered a lightning surge, then D16 and D17
are the most likely suspects.
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft Help:
http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
--
No virus found in this incoming message.
Checked by AVG Free Edition. Version: 7.5.472 / Virus Database:
269.9.0/852 - Release Date: 6/17/2007 8:23 AM
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
