K3 transverter connector question
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Good day.
I am considering recrystalling my 2m transverter with a 118MHz rock replacing the existing 116MHz crystal, thereby permitting full two metre band coverage with a 26-30MHz I/F. Does the K3 need to be widebanded to enable low-level 26-28MHz RF on the transverter transmit port or is the low-level output available by default? -- Chris Cox, N0UK, G4JEC [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] |
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Chris,
i'm using a 22MHz I/F for my 432MHz Transverter ( 102.5MHz *4 + 22=432MHz.) With the signal on 432, i transmit into a 13cm transverter for QO-100. I didn't change anything on my K3 other than buying the Transverter/RX-Antenna Board. So , no, it is not required to wideband the K3. OTOH, i found there is no 'general coverage' . The specifications drop when you move too far off and at a certain point, transmit fails. I suspect this also happens to the receive parameters, but you should give it a try. IIRC , it IS possible to tune above 30MHz, so you should try a I/F 28-32MHz with your 116MHz crystal and see how you get away. If you modify your transverter anyway , You may want to try a cheap solution: Buy a Si5351A Clock Breakout Board or similar. It can be programmed to output the frequency you need and i think is even more stable than the original crystal which drifts a lot. With a miniature computer like a arduino nano or attiny, you can build a clock source you can switch 116 / 118 Mhz . Or any other frequency. Am 13.11.20 um 09:05 schrieb [hidden email]: > Message: 21 > Date: Thu, 12 Nov 2020 16:08:33 -0600 (CST) > From: Chris Cox<[hidden email]> > To:[hidden email],[hidden email] > Subject: [Elecraft] K3 transverter connector question > Message-ID:<[hidden email]> > Content-Type: text/plain; format=flowed; charset=US-ASCII > > Good day. > > I am considering recrystalling my 2m transverter with a 118MHz rock > replacing the existing 116MHz crystal, thereby permitting full two metre > band coverage with a 26-30MHz I/F. > > Does the K3 need to be widebanded to enable low-level 26-28MHz RF on the > transverter transmit port or is the low-level output available by default? > > -- Chris Cox, N0UK, G4JEC [hidden email] -- 73, Martin DM4iM ______________________________________________________________ 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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Hi, Martin.
Thank you - that is great to hear. I will give that a try and see. I didn’t realize that I could actually tune above 30MHz directly, although I had not even tried. VY 73! Chris Cox, N0UK [hidden email] > On Nov 13, 2020, at 3:02 AM, Martin <[hidden email]> wrote: > > Chris, > i'm using a 22MHz I/F for my 432MHz Transverter ( 102.5MHz *4 + 22=432MHz.) With the signal on 432, i transmit into a 13cm transverter for QO-100. I didn't change anything on my K3 other than buying the Transverter/RX-Antenna Board. So , no, it is not required to wideband the K3. > OTOH, i found there is no 'general coverage' . The specifications drop when you move too far off and at a certain point, transmit fails. I suspect this also happens to the receive parameters, but you should give it a try. IIRC , it IS possible to tune above 30MHz, so you should try a I/F 28-32MHz with your 116MHz crystal and see how you get away. > > If you modify your transverter anyway , You may want to try a cheap solution: Buy a Si5351A Clock Breakout Board or similar. It can be programmed to output the frequency you need and i think is even more stable than the original crystal which drifts a lot. > With a miniature computer like a arduino nano or attiny, you can build a clock source you can switch 116 / 118 Mhz . Or any other frequency. > > Am 13.11.20 um 09:05 schrieb [hidden email]: >> Message: 21 >> Date: Thu, 12 Nov 2020 16:08:33 -0600 (CST) >> From: Chris Cox<[hidden email]> >> To:[hidden email],[hidden email] >> Subject: [Elecraft] K3 transverter connector question >> Message-ID:<[hidden email]> >> Content-Type: text/plain; format=flowed; charset=US-ASCII >> Good day. >> I am considering recrystalling my 2m transverter with a 118MHz rock >> replacing the existing 116MHz crystal, thereby permitting full two metre >> band coverage with a 26-30MHz I/F. >> Does the K3 need to be widebanded to enable low-level 26-28MHz RF on the >> transverter transmit port or is the low-level output available by default? >> -- Chris Cox, N0UK, G4JEC [hidden email] > > -- > 73, Martin DM4iM > ______________________________________________________________ > 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] |
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Tuning on my K3 stops at exactly 30.000MHz.
Chris Cox, N0UK [hidden email] > On Nov 13, 2020, at 8:08 AM, Chris Cox, N0UK <[hidden email]> wrote: > > Hi, Martin. > > Thank you - that is great to hear. I will give that a try and see. I didn’t realize that I could actually tune above 30MHz directly, although I had not even tried. > > VY 73! > > Chris Cox, N0UK > [hidden email] > > > >> On Nov 13, 2020, at 3:02 AM, Martin <[hidden email]> wrote: >> >> Chris, >> i'm using a 22MHz I/F for my 432MHz Transverter ( 102.5MHz *4 + 22=432MHz.) With the signal on 432, i transmit into a 13cm transverter for QO-100. I didn't change anything on my K3 other than buying the Transverter/RX-Antenna Board. So , no, it is not required to wideband the K3. >> OTOH, i found there is no 'general coverage' . The specifications drop when you move too far off and at a certain point, transmit fails. I suspect this also happens to the receive parameters, but you should give it a try. IIRC , it IS possible to tune above 30MHz, so you should try a I/F 28-32MHz with your 116MHz crystal and see how you get away. >> >> If you modify your transverter anyway , You may want to try a cheap solution: Buy a Si5351A Clock Breakout Board or similar. It can be programmed to output the frequency you need and i think is even more stable than the original crystal which drifts a lot. >> With a miniature computer like a arduino nano or attiny, you can build a clock source you can switch 116 / 118 Mhz . Or any other frequency. >> >> Am 13.11.20 um 09:05 schrieb [hidden email]: >>> Message: 21 >>> Date: Thu, 12 Nov 2020 16:08:33 -0600 (CST) >>> From: Chris Cox<[hidden email]> >>> To:[hidden email],[hidden email] >>> Subject: [Elecraft] K3 transverter connector question >>> Message-ID:<[hidden email]> >>> Content-Type: text/plain; format=flowed; charset=US-ASCII >>> Good day. >>> I am considering recrystalling my 2m transverter with a 118MHz rock >>> replacing the existing 116MHz crystal, thereby permitting full two metre >>> band coverage with a 26-30MHz I/F. >>> Does the K3 need to be widebanded to enable low-level 26-28MHz RF on the >>> transverter transmit port or is the low-level output available by default? >>> -- Chris Cox, N0UK, G4JEC [hidden email] >> >> -- >> 73, Martin DM4iM >> ______________________________________________________________ >> 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] ______________________________________________________________ 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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