Two K2... One Mic... Zéro Problem ? :-)
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Two K2... One Mic... Zéro Problem ? :-)
 
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Hi to all,
I would like to build another K2 this automn, I can't stand in my shack without no kit to build. ;-) But I would like to know if it is possible (I think to an easely yes) to operate two K2, one at a time of course, but using the same microphone with an a/b switch like. And when one K2 is in TX the other is stop listenning, to prevent or to protect it, from busting his fontend. If someone already did this setup, it would be really appreciated to share this project with us. Or at least somebody have a good start for this ??? 73 ============================================= /¯\/¯\/¯\/¯\/¯\/¯\ JEAN-FRANCOIS MENARD V A 2 V Y Z \_/\_/\_/\_/\_/\_/ Elecraft K2 #4130 Elecraft KX1 #999 http://homepage.mac.com/jfmenard ============================================= _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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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: > Hi to all, > > I would like to build another K2 this automn, I can't stand in my > shack without no kit to build. ;-) > > But I would like to know if it is possible (I think to an easely > yes) to operate two K2, one at a time of course, but using the same > microphone with an a/b switch like. And when one K2 is in TX the > other is stop listenning, to prevent or to protect it, from busting > his fontend. > > If someone already did this setup, it would be really appreciated > to share this project with us. Or at least somebody have a good > start for this ??? -Jack Brindle, W6FB ======================================================================= _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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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: > > >> Hi to all, >> >> I would like to build another K2 this automn, I can't stand in my >> shack without no kit to build. ;-) >> >> But I would like to know if it is possible (I think to an easely >> yes) to operate two K2, one at a time of course, but using the >> same microphone with an a/b switch like. And when one K2 is in TX >> the other is stop listenning, to prevent or to protect it, from >> busting his fontend. >> >> If someone already did this setup, it would be really appreciated >> to share this project with us. Or at least somebody have a good >> start for this ??? >> > > > -Jack Brindle, W6FB > ====================================================================== > = > > > _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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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: >> >> >> >>> Hi to all, >>> >>> I would like to build another K2 this automn, I can't stand in my >>> shack without no kit to build. ;-) >>> >>> But I would like to know if it is possible (I think to an easely >>> yes) to operate two K2, one at a time of course, but using the >>> same microphone with an a/b switch like. And when one K2 is in TX >>> the other is stop listenning, to prevent or to protect it, from >>> busting his fontend. >>> >>> If someone already did this setup, it would be really appreciated >>> to share this project with us. Or at least somebody have a good >>> start for this ??? >>> >>> >> >> >> -Jack Brindle, W6FB >> ===================================================================== >> == >> >> >> >> > > - Jack Brindle, W6FB ------------------------------------------------------------------------ --------------------- _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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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: >>> >>> >>> >>> >>>> Hi to all, >>>> >>>> I would like to build another K2 this automn, I can't stand in >>>> my shack without no kit to build. ;-) >>>> >>>> But I would like to know if it is possible (I think to an easely >>>> yes) to operate two K2, one at a time of course, but using the >>>> same microphone with an a/b switch like. And when one K2 is in >>>> TX the other is stop listenning, to prevent or to protect it, >>>> from busting his fontend. >>>> >>>> If someone already did this setup, it would be really >>>> appreciated to share this project with us. Or at least somebody >>>> have a good start for this ??? >>>> >>>> >>>> >>> >>> >>> -Jack Brindle, W6FB >>> ==================================================================== >>> === >>> >>> >>> >>> >>> >> >> >> > > - Jack Brindle, W6FB > ---------------------------------------------------------------------- > ----------------------- > > > _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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JEAN-FRANCOIS MENARD wrote:
> 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 ? ;-) > Sure it is possible, but a bit complicated. You would need to have a PIN diode switch (or relay) to short out the input to the non-keyed K2, as well as a few switches or relays to select which K2 is transmit-enabled Mic, PTT and antenna. Some sequencing to make delay transmit until after the input is shorted would be desirable. 73 et bonne chance! Bob, N7XY _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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YOOOU! I was not dreaming... ;-) Now what's next ? Anyone have a
schematic or an existing project that look like this one and I could start from ? Le 05-09-18 à 21:28, Bob Nielsen a écrit : > JEAN-FRANCOIS MENARD wrote: > >> 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 ? ;-) >> > > Sure it is possible, but a bit complicated. You would need to have > a PIN diode switch (or relay) to short out the input to the non- > keyed K2, as well as a few switches or relays to select which K2 is > transmit-enabled Mic, PTT and antenna. Some sequencing to make > delay transmit until after the input is shorted would be desirable. > > 73 et bonne chance! > > Bob, N7XY > _______________________________________________ > 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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JEAN-FRANCOIS MENARD wrote: > YOOOU! I was not dreaming... ;-) Now what's next ? Anyone have a > schematic or an existing project that look like this one and I could > start from ? Take a look at http://www.kkn.net/~k5tr/trlog/switch.pdf This is a schematic that I have used to switch between two K2's. I do not operate that much SSB, so I did not include the relay to switch the microphone, but the logging programs that I use (CT, Logger32) switch the keying and amp T/R line using Pin 14 on the LPT port. You could also do it with a manual switch. 73 Hank K8DD _______________________________________________ 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 |
RE: Two K2... One Mic... Zéro Problem ? :-)
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In reply to this post by JEAN-FRANCOIS MENARD-3
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: [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 |
Re: RE: Two K2... One Mic... Zéro Problem ? :-)
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OK Don, thanks for ideas...
I'm looking the ability to receive from both K2 at the same time. But when one K2 is TX, the receiving K2 will be off automaticaly (antenna momentary disconnected). When TX finished, both should receive again. The only manual operation I see is when I want to choose from wich one I would like to TX with. The antenna switching technic, with relay I guess, must be automatic. This module could be like a RF "power sense" autoswitching device... And I think that a very short time delay (a few ms at least) must exist between TX and RX to make sure that the antenna on the RX K2 is really off. On Monday, September 19, 2005, at 07:21AM, W3FPR - Don Wilhelm <[hidden email]> wrote: >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. _______________________________________________ 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 |
Re: Two K2... One Mic... Zéro Problem ? :-)
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JEAN-FRANCOIS MENARD wrote:
> OK Don, thanks for ideas... > > I'm looking the ability to receive from both K2 at the same time. But > when one K2 is TX, the receiving K2 will be off automaticaly (antenna > momentary disconnected). When TX finished, both should receive again. > The only manual operation I see is when I want to choose from wich > one I would like to TX with. The antenna switching technic, with > relay I guess, must be automatic. I'd be tempted to do it in software on a PIC16F84 or similar. You could have 2 PTTs if you want, or one single PTT and a rig selector switch. In any case, you want 2 PTT inputs, 2 PTT outputs, 2 ANT relays, and then your code goes something like this: # setup 5 connect both ANTs # main "waiting to TX" loop 10 if PTT1 pressed then goto 100 20 wait a few ms 30 if PTT2 pressed then goto 200 40 wait a few ms 50 goto 10 # TX on RIG1: 100 disconnect ANT2 110 wait a few ms for relay to bounce 120 PTTOUT1 on 130 wait a few ms 140 if PTT1 still pressed then goto 130 150 PTTOUT1 off 160 wait a few ms for rig to stop transmitting 170 connect both ANTs 180 goto 10 # TX on RIG2: 200 similar to 100...180 1 PIC (assuming you're able to program them), couple of relays, clock RC or crystal, few other bits and bobs. -- "Nosey" Nick Waterman, Senior Sysadmin. #include <stddisclaimer> [hidden email] What urge will save us now that sex won't. _______________________________________________ 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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