Jean-Francois, If you are switching the antenna from one transceiver to another by some manual method (relays or a switch), I should think that there should be adequate isolation if you were to switch in either a 50 ohm dummy load on the unused K2 or simply a short across the antenna terminals if there is no danger that transmit might be accidently activated on the unused K2.
Since it sounds like you just want to manually switch which K2 is active rather doing fast switching (like contest SO2R operation), and if so, you should be able to control the audio path with either a set of switch contacts directly or by using analog switches. Antenna side relays could be activated from additional contacts on the switch that changes the mic path. The computer peripheral switching boxes that are available at a low price can provide the enclosure and a suitable switch. Unless there is more to this than what you have said, I would recommend that the switching be kept as simple as possible - I hope I have provided some ideas. 73, Don W3FPR > -----Original Message----- > > I'm looking at a way to merge enterely two K2 to the same ressource: > ONE mic and ONE multi-band antenna. So the setup interface must be > able to switch mic between K2, and when one K2 transmit, the > receiving on the other K2 is muted.... and also making sure that the > RF is stopped and do not enter in the receiving K2.... One Antenna > for two K2.... when both K2 do not transmit, they can listen on > different or same band at the same time. > > Am I dreaming ? It must be possible to do this project ? ;-) > > 73 > > Le 05-09-18 à 20:08, Jack Brindle a écrit : > > > If you are really worried about it, Wayne came up with a > > modification to improve the K2's strong-signal handling > > characteristics. This was created specifically to protect the > > receiver in the presence of strong near-by signals. Usually these > > are only a problem when the transmitter and receiver are on the > > same band, or even on the same frequency. If you keep the radios on > > different bands, I doubt you will see much problem. > > > > I hope this helps, et bon chance! > > > > On Sep 18, 2005, at 4:14 PM, JEAN-FRANCOIS MENARD wrote: > > > > > >> Ok for the mic. My main concern is for the K2 that will be > >> receiving when the other transmit and vice-versa.... > >> > >> Le 05-09-18 à 18:50, Jack Brindle a écrit : > >> > >> > >> > >>> This is very close to contesting's SO2R (Single Op, two radios). > >>> The difference is that in SO2R both radios are always active. > >>> When one transmits, the other continues to receive. Bandpass > >>> filters are used to keep the transmit RF from adversely affecting > >>> the 2nd radio's receiver. If it did hurt it, then that radio > >>> would be rather useless when the first is transmitting, right? > >>> > >>> Switching the microphone between the two radios shouldn't be too > >>> difficult with a simple switch, and if you really want to get > >>> fancy, you too could become addicted to creating the ultimate > >>> SO2R box... ;-) > >>> > >>> A web lookup on SO2R should be quite revealing. After reading the > >>> articles, you might realize that it is not that difficult to use > >>> TWO K2s at the same time! > >>> > >>> On Sep 18, 2005, at 7:54 AM, JEAN-FRANCOIS MENARD wrote: > >>> > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.11.1/104 - Release Date: 9/16/2005 _______________________________________________ Elecraft mailing list Post to: [email protected] 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
