Antenna switching
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I put up a vertical yesterday to begin playing with diversity mode.
When I installed the sub receiver I opted to connect the Aux RF BNC connector. Now I am not sure I made the right decision for me as I want to be able to easily switch transmit and receive antennas. Of course then my 20M dipole and my 6 M vertical would be just sitting there unconnected and to switch bands I have to plug new cables in. I have more antennas planned for the future and I may try some kind of low noise receive-only antenna. In the old days a simple antenna switch would be all I need but now I have multiple simultaneous antennas to switch and I need to make sure I don't transmit out of Antenna 1 into the Aux Rx port ;-) So now I am considering building some kind of well isolated Antenna switch matrix. I am interested in what others are doing. If I use relays, how does one build for good cross-talk isolation between antennas? Maybe all I need is two or three simple antenna switches. Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) K3-100 #508/ KX1 #1311 _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Mike, take a look at Array Solutions and see if they don't have an offering that either fits your needs or gives you some ideas to work with.
Willis 'Cookie' Cooke K5EWJ --- On Wed, 1/28/09, Mike Scott <[hidden email]> wrote: > From: Mike Scott <[hidden email]> > Subject: [Elecraft] Antenna switching [K3] > To: [hidden email] > Date: Wednesday, January 28, 2009, 12:30 PM > I put up a vertical yesterday to begin playing with > diversity mode. > > When I installed the sub receiver I opted to connect the > Aux RF BNC > connector. Now I am not sure I made the right decision for > me as I want to > be able to easily switch transmit and receive antennas. Of > course then my > 20M dipole and my 6 M vertical would be just sitting there > unconnected and > to switch bands I have to plug new cables in. I have more > antennas planned > for the future and I may try some kind of low noise > receive-only antenna. > > In the old days a simple antenna switch would be all I need > but now I have > multiple simultaneous antennas to switch and I need to make > sure I don't > transmit out of Antenna 1 into the Aux Rx port ;-) > > So now I am considering building some kind of well isolated > Antenna switch > matrix. I am interested in what others are doing. If I use > relays, how does > one build for good cross-talk isolation between antennas? > Maybe all I need > is two or three simple antenna switches. > > Mike Scott - AE6WA > Tarzana, CA (DM04 / near LA) > K3-100 #508/ KX1 #1311 > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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So is a KRC2 in order?
73 de M0XDF, K3 #174 -- Don‘t complain. Nobody will understand. Or care. And certainly don‘t try to fix the situation yourself. It‘s dangerous. Leave it to a highly untrained, unqualified, expendable professional. On 28 Jan 2009, at 22:14, WILLIS COOKE wrote: > Mike, take a look at Array Solutions and see if they don't have an > offering that either fits your needs or gives you some ideas to work > with. > > Willis 'Cookie' Cooke > K5EWJ > > > --- On Wed, 1/28/09, Mike Scott <[hidden email]> wrote: > >> From: Mike Scott <[hidden email]> >> Subject: [Elecraft] Antenna switching [K3] >> To: [hidden email] >> Date: Wednesday, January 28, 2009, 12:30 PM >> I put up a vertical yesterday to begin playing with >> diversity mode. >> >> When I installed the sub receiver I opted to connect the >> Aux RF BNC >> connector. Now I am not sure I made the right decision for >> me as I want to >> be able to easily switch transmit and receive antennas. Of >> course then my >> 20M dipole and my 6 M vertical would be just sitting there >> unconnected and >> to switch bands I have to plug new cables in. I have more >> antennas planned >> for the future and I may try some kind of low noise >> receive-only antenna. >> >> In the old days a simple antenna switch would be all I need >> but now I have >> multiple simultaneous antennas to switch and I need to make >> sure I don't >> transmit out of Antenna 1 into the Aux Rx port ;-) >> >> So now I am considering building some kind of well isolated >> Antenna switch >> matrix. I am interested in what others are doing. If I use >> relays, how does >> one build for good cross-talk isolation between antennas? >> Maybe all I need >> is two or three simple antenna switches. >> >> Mike Scott - AE6WA >> Tarzana, CA (DM04 / near LA) >> K3-100 #508/ KX1 #1311 >> Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Mike Scott-7
Mike,
Relays are the answer IMHO. Take a look at the "A Low-Cost Remote Antenna Switch" by Bill Smith KO4NR in QST April 2005. ARRL measured the isolation at >60 dB except for the two innermost ports which were 50 dB at 28 MHz. FAR circuits has boards for this project. I built 3 for switching my many HF antennas down to 3 runs of coax into the shack (not all the ports are used, I have only 12 HF antennas to switch. As for preventing transmit out of one K3 antenna port into your Aux Rx port, rotary control switches will likely help since a simple rotary switch will only activate one relay of any set. If you have more than one set of remote relays and you connect any one antenna to 2 or more of the remote switches, then you could transmit back into the receiver, so connect any one antenna to only one relay port and make all the other arrangements with switches to the relay coils. Yes, when I get around to completing the complete system, the KRC2 will control the selection from the K3 automatically - the ACC outputs select between 3 sets of antennas. 73, Don W3FPR Mike Scott wrote: > I put up a vertical yesterday to begin playing with diversity mode. > > When I installed the sub receiver I opted to connect the Aux RF BNC > connector. Now I am not sure I made the right decision for me as I want to > be able to easily switch transmit and receive antennas. Of course then my > 20M dipole and my 6 M vertical would be just sitting there unconnected and > to switch bands I have to plug new cables in. I have more antennas planned > for the future and I may try some kind of low noise receive-only antenna. > > In the old days a simple antenna switch would be all I need but now I have > multiple simultaneous antennas to switch and I need to make sure I don't > transmit out of Antenna 1 into the Aux Rx port ;-) > > So now I am considering building some kind of well isolated Antenna switch > matrix. I am interested in what others are doing. If I use relays, how does > one build for good cross-talk isolation between antennas? Maybe all I need > is two or three simple antenna switches. > > Mike Scott - AE6WA > Tarzana, CA (DM04 / near LA) > K3-100 #508/ KX1 #1311 > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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 - http://www.avg.com > Version: 8.0.176 / Virus Database: 270.10.15/1921 - Release Date: 1/28/2009 6:37 AM > > Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Mike Scott-7
Mike
A simple, inexpensive solution might be to use the MFJ-1703 RF safety switch. You can attach the TX and RCX to two ports and two antennas to the other two. Flipping the switch swaps antennas, but there is no position that connects TX to RCV. I use one to connect an antenna and a dummy load to my vintage Mosley CM-1 receiver and Heathkit DX-60 transmitter. Bob KD8CGH |
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In reply to this post by Mike Scott-7
Mike,
I think you should look into the kxv3, which I think may be able to setup things the way you want them. 73, Tom-N2YTF
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