2m internal transverter PTT out
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2m internal transverter PTT out
 
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Dear Elecrafters,
I have a K3 with an internal 2m transverter that I use with an external amp. Initially I had the amp connected to PTT-out but that would key the 2m amp if I transmitted on any band. To help with this, I put the optional jumper on P8 in the transverter so that it put out 5v on ant3 (2m out) while transmitting. I then built a simple NPN grounded emitter circuit to key the 2m amp by grounding its PTT-in when 5v show up on output of the transverter. Here is the shocker: 5v show up on 2m transverter out whenever I transmit on ANY band. How disappointing. Am I missing something? Is there a simple fix? Raj, N2RD ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: 2m internal transverter PTT out
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Raj...
I have the same issue, but a less elegant solution. My 2 Meter amplifier has a remote head that has the keying input located on the back of it. I opened it up and wired a toggle switch in line with the circuit with an LED. I labeled it STBY/OPR like on my Ameritron AL-1200. I just flip the 2 meter amp "out" of the PTT circuit when I'm not using it. Thanks, Hank K4HYJ -----Original Message----- From: [hidden email] <[hidden email]> On Behalf Of Rajiv Dewan via Elecraft Sent: Tuesday, October 20, 2020 9:34 AM To: [hidden email] Subject: [Elecraft] 2m internal transverter PTT out Dear Elecrafters, I have a K3 with an internal 2m transverter that I use with an external amp. Initially I had the amp connected to PTT-out but that would key the 2m amp if I transmitted on any band. To help with this, I put the optional jumper on P8 in the transverter so that it put out 5v on ant3 (2m out) while transmitting. I then built a simple NPN grounded emitter circuit to key the 2m amp by grounding its PTT-in when 5v show up on output of the transverter. Here is the shocker: 5v show up on 2m transverter out whenever I transmit on ANY band. How disappointing. Am I missing something? Is there a simple fix? Raj, N2RD ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: 2m internal transverter PTT out
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Nice solution.
Unfortunately for me, I am trying to operate remotely. I may just have to get a web switch and turn the amp on and off. I am hoping that some one has a better solution. Raj, N2RD > On Oct 20, 2020, at 11:52 AM, <[hidden email]> <[hidden email]> wrote: > > Raj... > I have the same issue, but a less elegant solution. My 2 Meter amplifier > has a remote head that has the keying input located on the back of it. I > opened it up and wired a toggle switch in line with the circuit with an LED. > I labeled it STBY/OPR like on my Ameritron AL-1200. I just flip the 2 meter > amp "out" of the PTT circuit when I'm not using it. > > Thanks, > Hank > K4HYJ > > -----Original Message----- > From: [hidden email] <mailto:[hidden email]> <[hidden email] <mailto:[hidden email]>> On > Behalf Of Rajiv Dewan via Elecraft > Sent: Tuesday, October 20, 2020 9:34 AM > To: [hidden email] <mailto:[hidden email]> > Subject: [Elecraft] 2m internal transverter PTT out > > Dear Elecrafters, > > I have a K3 with an internal 2m transverter that I use with an external > amp. Initially I had the amp connected to PTT-out but that would key the 2m > amp if I transmitted on any band. To help with this, I put the optional > jumper on P8 in the transverter so that it put out 5v on ant3 (2m out) while > transmitting. I then built a simple NPN grounded emitter circuit to key the > 2m amp by grounding its PTT-in when 5v show up on output of the transverter. > Here is the shocker: 5v show up on 2m transverter out whenever I transmit > on ANY band. How disappointing. Am I missing something? Is there a simple > fix? > > Raj, N2RD > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to [hidden email] <mailto:[hidden email]> Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: 2m internal transverter PTT out
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acknowledgement of reply to post test
______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: 2m internal transverter PTT out
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In reply to this post by Elecraft mailing list
Maybe a web controlled appliance plug? I have one that operates a
dehumidifier that I can operate with an app on my iPhone. Use something like that that has a relay inside - just wire it up for your amp main. From: Rajiv Dewan <[hidden email]> Sent: Tuesday, October 20, 2020 12:15 PM To: [hidden email] Cc: [hidden email] Subject: Re: [Elecraft] 2m internal transverter PTT out Nice solution. Unfortunately for me, I am trying to operate remotely. I may just have to get a web switch and turn the amp on and off. I am hoping that some one has a better solution. Raj, N2RD On Oct 20, 2020, at 11:52 AM, <[hidden email] <mailto:[hidden email]> > <[hidden email] <mailto:[hidden email]> > wrote: Raj... I have the same issue, but a less elegant solution. My 2 Meter amplifier has a remote head that has the keying input located on the back of it. I opened it up and wired a toggle switch in line with the circuit with an LED. I labeled it STBY/OPR like on my Ameritron AL-1200. I just flip the 2 meter amp "out" of the PTT circuit when I'm not using it. Thanks, Hank K4HYJ -----Original Message----- From: <mailto:[hidden email]> [hidden email] < <mailto:[hidden email]> [hidden email]> On Behalf Of Rajiv Dewan via Elecraft Sent: Tuesday, October 20, 2020 9:34 AM To: <mailto:[hidden email]> [hidden email] Subject: [Elecraft] 2m internal transverter PTT out Dear Elecrafters, I have a K3 with an internal 2m transverter that I use with an external amp. Initially I had the amp connected to PTT-out but that would key the 2m amp if I transmitted on any band. To help with this, I put the optional jumper on P8 in the transverter so that it put out 5v on ant3 (2m out) while transmitting. I then built a simple NPN grounded emitter circuit to key the 2m amp by grounding its PTT-in when 5v show up on output of the transverter. Here is the shocker: 5v show up on 2m transverter out whenever I transmit on ANY band. How disappointing. Am I missing something? Is there a simple fix? Raj, N2RD ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to <mailto:[hidden email]> [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: 2m internal transverter PTT out
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In reply to this post by Elecraft mailing list
Raj,
There are two ways to deal with this. First you can use DIGOUT1 to key an external relay which controls where the common PTT goes, either to an HF amp or a 2m amp. In the menu, set DIGOUT1 to on for 2m only. A small, low current 12v relay connected between 12VDC and pin 11 on the 15pin HD connector on the back. Let the common of the relay go to the PTT jack, NC to your HF amp and NO to your 2m amp. Second is DIGOUT0 which when KIO3 is set to TRN or HF-TRN goes low when you select a transverter band (anything about 6m). This could also key a small 12v relay to steer PTT the proper direction. As above. Hope this helps. Terry Price - W8ZN Directive Systems and Engineering ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: 2m internal transverter PTT out
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In reply to this post by Elecraft mailing list
Set the "band Outputs" correctly (page 19 of the K3 Owners Manual) and build a discrete logic (TTL/CMOS) band decoder to select PTT to the 2 meter or HF/6m amplifier. Alternatively, get a band decoder that works on the frequency data from CAT/RS232 (like microHAM Station Master) and allow it to select PTT to the 2 meter on HF?6m amplifier based on the CAT data. 73, ... Joe, W4TV On 2020-10-20 12:14 PM, Rajiv Dewan via Elecraft wrote: > Nice solution. > > Unfortunately for me, I am trying to operate remotely. I may just have to get a web switch and turn the amp on and off. I am hoping that some one has a better solution. > > Raj, N2RD > >> On Oct 20, 2020, at 11:52 AM, <[hidden email]> <[hidden email]> wrote: >> >> Raj... >> I have the same issue, but a less elegant solution. My 2 Meter amplifier >> has a remote head that has the keying input located on the back of it. I >> opened it up and wired a toggle switch in line with the circuit with an LED. >> I labeled it STBY/OPR like on my Ameritron AL-1200. I just flip the 2 meter >> amp "out" of the PTT circuit when I'm not using it. >> >> Thanks, >> Hank >> K4HYJ >> >> -----Original Message----- >> From: [hidden email] <mailto:[hidden email]> <[hidden email] <mailto:[hidden email]>> On >> Behalf Of Rajiv Dewan via Elecraft >> Sent: Tuesday, October 20, 2020 9:34 AM >> To: [hidden email] <mailto:[hidden email]> >> Subject: [Elecraft] 2m internal transverter PTT out >> >> Dear Elecrafters, >> >> I have a K3 with an internal 2m transverter that I use with an external >> amp. Initially I had the amp connected to PTT-out but that would key the 2m >> amp if I transmitted on any band. To help with this, I put the optional >> jumper on P8 in the transverter so that it put out 5v on ant3 (2m out) while >> transmitting. I then built a simple NPN grounded emitter circuit to key the >> 2m amp by grounding its PTT-in when 5v show up on output of the transverter. >> Here is the shocker: 5v show up on 2m transverter out whenever I transmit >> on ANY band. How disappointing. Am I missing something? Is there a simple >> fix? >> >> Raj, N2RD ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
This is disappointing news. I just purchased a K3S-10 to use mainly as a uWave IF.
I looked at the K144XV and KXV3B schematics. The fix will need to be implemented on the KXV3B. The K144XV uController monitors the 7R voltage from the baseboard, that is routed through KXV3B, and when this voltage is 0, the 5R voltage is turned off, and 5T ON, sending +5V out the BNC if it is strapped in. There is not a way for the K144XV to determine the transition out of the RX to the TX state was NOT intended for it. So the K144XV is being cycled RX/TX, enabled or not. I have determined a fix that would require 1 trace cut, 2 diodes, and 2 resistors, and 4 connections on the KXV3B. It is rather simple in circuit design concept, but may be physically difficult to implement. Possibly with SMT components and a very small PCB. I do not know how much room is available, or if the trace cut mentioned can be made. Ben W4SC Sent from Mail for Windows 10 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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