Re: [Elecraft] two transceivers and one antenna
I've used an MFJ-1702C for a number of years and haven't fried anything yet. One of the Alpha-Delta SPDT switches is somewhat pricer but a higher quality switch. Doug W6JD -- Original message -- From: "Scott McDowell" <[EMAIL PROTECTED]> > Hi > I need some ones opinion on something I am thinking about doing. > I sure hate to have to say, I wish I hadn't done that! > I have two transceivers and one multi-band yagis antenna. > Switching the coax from one rig to the other gets to be a hassle. > I've been thinking about getting a coaxial switch with > two outputs and one input. Then connecting one transceiver > to one output and the other transceiver to the other output. > Then connect the input to the beam. Is there going to be > enough seperation in the switch to keep from damaging > the transceiver that is turned off and switched out of > the circuit? Has anyone done this? > Any information appreciated. > 73 > Scott > N5SM > ___ > 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
RE: [Elecraft] two transceivers and one antenna
Although it's a bit on the wimpy side, MFJ makes an "RF Safety Switch" that does just this. See: <http://www.mfjenterprises.com/Product.php?productid=MFJ-1703> It is also possible to build your own - of much higher quality - by using a pair of Top Ten Devices A/BSS relays and some T connectors. 73, ... Joe, W4TV > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Robert > Tellefsen > Sent: Saturday, April 19, 2008 12:31 PM > To: Scott McDowell; elecraft@mailman.qth.net > Subject: Re: [Elecraft] two transceivers and one antenna > > > Hi Scott > Haven't done it myself, but I've read descriptions > where others have done it with relays. One radio > would be connected to the feedline, and the other radio > would be connected to a dummy load. At the throw > of a switch, their connections would be reversed. > That should provide all the protection you would need, > plus be more convenient just having a switch at the > operating position, instead of a manual coax switch > with three coax runs to it. > > Good luck and 73 > Bob N6WG > > - Original Message - > From: "Scott McDowell" <[EMAIL PROTECTED]> > To: > Sent: Friday, April 18, 2008 7:55 PM > Subject: [Elecraft] two transceivers and one antenna > > > > Hi > > I need some ones opinion on something I am thinking about doing. > > I sure hate to have to say, I wish I hadn't done that! > > I have two transceivers and one multi-band yagis antenna. > > Switching the coax from one rig to the other gets to be a hassle. > > I've been thinking about getting a coaxial switch with > > two outputs and one input. Then connecting one transceiver > > to one output and the other transceiver to the other output. > > Then connect the input to the beam. Is there going to be > > enough seperation in the switch to keep from damaging > > the transceiver that is turned off and switched out of > > the circuit? Has anyone done this? > > Any information appreciated. > > 73 > > Scott > > N5SM > > ___ > > 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 ___ 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
Re: [Elecraft] two transceivers and one antenna
Hi Scott Haven't done it myself, but I've read descriptions where others have done it with relays. One radio would be connected to the feedline, and the other radio would be connected to a dummy load. At the throw of a switch, their connections would be reversed. That should provide all the protection you would need, plus be more convenient just having a switch at the operating position, instead of a manual coax switch with three coax runs to it. Good luck and 73 Bob N6WG - Original Message - From: "Scott McDowell" <[EMAIL PROTECTED]> To: Sent: Friday, April 18, 2008 7:55 PM Subject: [Elecraft] two transceivers and one antenna > Hi > I need some ones opinion on something I am thinking about doing. > I sure hate to have to say, I wish I hadn't done that! > I have two transceivers and one multi-band yagis antenna. > Switching the coax from one rig to the other gets to be a hassle. > I've been thinking about getting a coaxial switch with > two outputs and one input. Then connecting one transceiver > to one output and the other transceiver to the other output. > Then connect the input to the beam. Is there going to be > enough seperation in the switch to keep from damaging > the transceiver that is turned off and switched out of > the circuit? Has anyone done this? > Any information appreciated. > 73 > Scott > N5SM > ___ > 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
Re: [Elecraft] two transceivers and one antenna
Scott, The real answer is "it all depends" - it depends on the isolation provided by your particular relay. Since you did not specify the relay that you are considering, I cannot look up the characteristics, but you are looking for an isolation of 60 dB or greater if you are considering 100 watts of power - if you are also considering an amplifier to the legal limit, look for something that will provide 80 dB of isolation. You will also have to consider how to mute the transceiver that is not being selected unless you can arrange for some other method of protecting your ears. 73, Don W3FPR Scott McDowell wrote: Hi I need some ones opinion on something I am thinking about doing. I sure hate to have to say, I wish I hadn't done that! I have two transceivers and one multi-band yagis antenna. Switching the coax from one rig to the other gets to be a hassle. I've been thinking about getting a coaxial switch with two outputs and one input. Then connecting one transceiver to one output and the other transceiver to the other output. Then connect the input to the beam. Is there going to be enough seperation in the switch to keep from damaging the transceiver that is turned off and switched out of the circuit? Has anyone done this? Any information appreciated. 73 Scott N5SM ___ 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
