Re: [Elecraft] K1 - VFO frequency range
Hello Mike and Cameron, I appreciate your tips. I adjusted the L1 inductor, getting 3.500,3 mhz and 20.098,2 mhz on VFO. That was perfect to me. (updating Cameron about the email) So I moved the rig to another place and used another PSU (first using a 12,4v, and after using a 13.8v PSU) I noticed that this minimum frequency changed to 3.501,2 mhz. No problem about that. Thanks and 73, de PY1ZB, Roney On Wed, May 24, 2017 at 11:56 PM, Cameron Francey < cameronfranceyut...@hotmail.com> wrote: > Just as an additional note. I built two K1's last year and even though I > wound the turns for L1 so they were really tight as I found from experience > its much easier to spread them out a bit than to compress them again. In > both K1's I actually had to remove one turn to get the VFO low enough. The > manual does mention this may be needed. > > > Just though I'd bring that up since I had to do that fairly recently. > > > > Cameron - AF7DK/GM7LQR > > > > > -- > *From:* Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Mike > Morrow <k...@earthlink.net> > *Sent:* Wednesday, May 24, 2017 9:04 AM > *To:* roney; elecraft@mailman.qth.net > *Subject:* Re: [Elecraft] K1 - VFO frequency range > > I assume you have already calibrated the LCD display on each band using > the OCF menue function. That makes the LCD indicate the actual transmitter > output frequency, This display calibration for each band must be performed > before adjustment of where the low end of each band starts. > > Because the K1 has no way of adjusting the oscillation frequency of the > individual heterodyne crystals on the filter board, the only band edge > adjustment possible is accomplished by altering the VFO frequency. That > affects both bands equally. > > Your data show the K1 tuning band is too low by about 5.2 kHz. The VFO > SUBTRACTS from the heterodyne crystal frequency, so to RAISE the K1 > frequency of operation you must LOWER the VFO frequency by squeezing CLOSER > together some of the turns on the RF board L1 VFO toroid. It won't require > much. Try that until the low end of 80m indicates about 3499.0 kHz on the > LCD. That 80m L1 adjustment will also bring the low end of 15m to about > 20996.1 kHz. That will be the closest you'll get on 15m. If you adjusted > L1 until 15m starts at 20999.0, then 80m will start at 3501.9 kHz. You'll > have lost some low end 80m coverage. > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 - VFO frequency range
Just as an additional note. I built two K1's last year and even though I wound the turns for L1 so they were really tight as I found from experience its much easier to spread them out a bit than to compress them again. In both K1's I actually had to remove one turn to get the VFO low enough. The manual does mention this may be needed. Just though I'd bring that up since I had to do that fairly recently. Cameron - AF7DK/GM7LQR From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Mike Morrow <k...@earthlink.net> Sent: Wednesday, May 24, 2017 9:04 AM To: roney; elecraft@mailman.qth.net Subject: Re: [Elecraft] K1 - VFO frequency range I assume you have already calibrated the LCD display on each band using the OCF menue function. That makes the LCD indicate the actual transmitter output frequency, This display calibration for each band must be performed before adjustment of where the low end of each band starts. Because the K1 has no way of adjusting the oscillation frequency of the individual heterodyne crystals on the filter board, the only band edge adjustment possible is accomplished by altering the VFO frequency. That affects both bands equally. Your data show the K1 tuning band is too low by about 5.2 kHz. The VFO SUBTRACTS from the heterodyne crystal frequency, so to RAISE the K1 frequency of operation you must LOWER the VFO frequency by squeezing CLOSER together some of the turns on the RF board L1 VFO toroid. It won't require much. Try that until the low end of 80m indicates about 3499.0 kHz on the LCD. That 80m L1 adjustment will also bring the low end of 15m to about 20996.1 kHz. That will be the closest you'll get on 15m. If you adjusted L1 until 15m starts at 20999.0, then 80m will start at 3501.9 kHz. You'll have lost some low end 80m coverage. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 - VFO frequency range
I assume you have already calibrated the LCD display on each band using the OCF menue function. That makes the LCD indicate the actual transmitter output frequency, This display calibration for each band must be performed before adjustment of where the low end of each band starts. Because the K1 has no way of adjusting the oscillation frequency of the individual heterodyne crystals on the filter board, the only band edge adjustment possible is accomplished by altering the VFO frequency. That affects both bands equally. Your data show the K1 tuning band is too low by about 5.2 kHz. The VFO SUBTRACTS from the heterodyne crystal frequency, so to RAISE the K1 frequency of operation you must LOWER the VFO frequency by squeezing CLOSER together some of the turns on the RF board L1 VFO toroid. It won't require much. Try that until the low end of 80m indicates about 3499.0 kHz on the LCD. That 80m L1 adjustment will also bring the low end of 15m to about 20996.1 kHz. That will be the closest you'll get on 15m. If you adjusted L1 until 15m starts at 20999.0, then 80m will start at 3501.9 kHz. You'll have lost some low end 80m coverage. The K1 has been around since 2000, which is how long I've had #175. What's the serial on your recent K1? It's still a magnificent radio. Mike / KK5F -Original Message- >From: roney <roneymo...@gmail.com> >Sent: May 24, 2017 7:52 AM >To: elecraft@mailman.qth.net >Subject: [Elecraft] K1 - VFO frequency range > >Hello, I just finished all tests and adjustments in my K1. >It works great. I have 2 filter band as 80m and 15m. >It's transmitting and receiving very well. > >I followed all tests in: > >VFO Range Test (Page 38): >VFO knob fully clockwise = 3.007 khz >VFO knob fully counterclockwise = 3.091 khz >VFO range = 84 khz > >So I did Band Assignments (Page 39), etc, etc. > >When seeing each band, my real ranges are: > >80m: 3.493,8 to 3.577,6 mhz >15m: 20.990,9 to 21.074,6 mhz > >I did not understand how to adjust these low and high limits. Should I >change some inductor turns ? or is there any menu adjust for these limits ? > >Thanks for the help, >Roney Monte PY1ZB >__ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 - VFO frequency range
Roney, There is no adjustment for individual bands. If you have no other band boards, you can adjust the turns on L1 to bring the lower end of 80 meters up to 3.500 MHz. Normally, the VFO range is adjusted so that all bands will tune a bit below the low frequency limit. This compensates for slight variation of the exact frequency of the crystal on the band board. If you have multiple band boards, check to see which band is closest to the lower ham band and adjust the turns spacing of L1 to bring that band near the lower edge of the band. 73, Don W3FPR On 5/24/2017 8:52 AM, roney wrote: So I did Band Assignments (Page 39), etc, etc. When seeing each band, my real ranges are: 80m: 3.493,8 to 3.577,6 mhz 15m: 20.990,9 to 21.074,6 mhz I did not understand how to adjust these low and high limits. Should I change some inductor turns ? or is there any menu adjust for these limits ? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K1 - VFO frequency range
Hello, I just finished all tests and adjustments in my K1. It works great. I have 2 filter band as 80m and 15m. It's transmitting and receiving very well. I followed all tests in: VFO Range Test (Page 38): VFO knob fully clockwise = 3.007 khz VFO knob fully counterclockwise = 3.091 khz VFO range = 84 khz So I did Band Assignments (Page 39), etc, etc. When seeing each band, my real ranges are: 80m: 3.493,8 to 3.577,6 mhz 15m: 20.990,9 to 21.074,6 mhz I did not understand how to adjust these low and high limits. Should I change some inductor turns ? or is there any menu adjust for these limits ? Thanks for the help, Roney Monte PY1ZB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K1 VFO frequency range change
I changed the VFO frequency range capacitor to 120 pf and now have a 178 khz tuning range. Since I only need 125 khz to reach the SKCC frequency of 7120 khz, I may try a 100 pf capacitor. I would like to know what types of capacitors will work will here. The 68 pf capacitor is a disc ceramic and the 120 pf capacitor is a polystyrene type. To make this change, I not only needed to change the VFO capacitor, but also the 30m xtal and futz around with the turn spacing on the VFO coil to get the proper VFO range. I do not find the 18 khz per revolution tuning rate to be difficult but it is my nature to keep fussing. 73 - Rick - K7MW - Original Message - From: Rick Dettinger [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Monday, April 03, 2006 10:12 PM Subject: [Elecraft] K1 AGC time constant I changed C31 on the RF board to 1uf but it still seems very slow. When I remove an S9 siginal (50uv) it takes about 15 seconds for the S meter to decay to one bar. I used a non polorized electrolitic cap as that is what they had at RS. It is physically larger than the original cap but there is plenty of room. I am not sure what a non polorized electrolitic capacitor is but there are no polarity marks, which I haven't seen before. Should I try a smaller value for C31? Thanks - Rick - K7MW ___ 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] K1 VFO frequency range change
I changed the VFO frequency range capacitor to 120 pf and now have a 178 khz tuning range. That's why I've always termed this option as the 180 kHz option rather than Elecraft's 150 kHz characterization. Since I only need 125 khz to reach the SKCC frequency of 7120 khz, I may try a 100 pf capacitor. There's a lot more Morse activity above 7120 kHz. To me, that's more than worth the additional VFO span. You mentioned having changed out the 30m hetrodyne crystal, which I assume means that your 30m band tuning now starts near 10 MHz. Reducing VFO span to, say, 125 kHz will mean that you'll only be able to cover about the first 20 kHz of the 30m band. 73, Mike / KK5F ___ 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] K1 VFO frequency range change
You mentioned having changed out the 30m hetrodyne crystal, which I assume means that your 30m band tuning now starts near 10 MHz. Reducing VFO span to, say, 125 kHz will mean that you'll only be able to cover about the first 20 kHz of the 30m band. 73, Mike / KK5F Yes, I can copy WWV on 10 mhz now. I need to get up to about 10.125 mhz so will need about 130 khz due to some overlap at the low end. Thanks, I hadn't thought ahead enough. Maybe I will just leave it at 178 khz for awhile and check out some new territory. Even 7120 khz is new for me. Prior to SKCC being started up in Janurary, I never went far from 7040 khz. 73 - Rick - K7MW ___ 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] K1 VFO frequency range change
Irecently changed my K1's VFO range. Now I can reach 7150 on 40 meters. On 80 (with my 2 band 160/80 meter RF board) I get up to around 3673. I also tried the 1 mf cap in AGC circuit with no results. 73, Sandy W5TVW - Original Message - From: Rick Dettinger [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Wednesday, April 05, 2006 2:53 PM Subject: [Elecraft] K1 VFO frequency range change | I changed the VFO frequency range capacitor to 120 pf and now have a 178 khz | tuning range. Since I only need 125 khz to reach the SKCC frequency of | 7120 khz, I may try a 100 pf capacitor. I would like to know what types of | capacitors will work will here. The 68 pf capacitor is a disc ceramic and | the 120 pf capacitor is a polystyrene type. To make this change, I not | only needed to change the VFO capacitor, but also the 30m xtal and futz | around with the turn spacing on the VFO coil to get the proper VFO range. I | do not find the 18 khz per revolution tuning rate to be difficult but it is | my nature to keep fussing. 73 - Rick - K7MW | - Original Message - | From: Rick Dettinger [EMAIL PROTECTED] | To: elecraft@mailman.qth.net | Sent: Monday, April 03, 2006 10:12 PM | Subject: [Elecraft] K1 AGC time constant | | | I changed C31 on the RF board to 1uf but it still seems very slow. When | I | remove an S9 siginal (50uv) it takes about 15 seconds for the S meter to | decay to one bar. I used a non polorized electrolitic cap as that is what | they had at RS. It is physically larger than the original cap but there | is | plenty of room. I am not sure what a non polorized electrolitic capacitor | is but there are no polarity marks, which I haven't seen before. Should | I | try a smaller value for C31? Thanks - Rick - K7MW | | ___ | 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 | | | | -- | No virus found in this incoming message. | Checked by AVG Free Edition. | Version: 7.1.385 / Virus Database: 268.3.5/301 - Release Date: 4/4/2006 | | ___ 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] K1 VFO frequency range change
This is the MAIN reason I changed the VFO span, to get up to 7100 to 7150 coverage. At the same time, I pulled the 30 meter crystal and installed the 10-10.15 crystal originally supplied if the 150 Khz span was desired. I also replaced the original plastic shaft 10 turn tuning pot with a metal shaft/busing replacement, as my old pot was getting a bit sloppy mechanically. Really like this little rig. Now I wish I could have 160-10 meter coverage without changing RF boards! Wayne: THAT would be a feat in the space allotted for the RF board! A 9 band board? 73, Sandy W5TVW - Original Message - From: Mike Morrow [EMAIL PROTECTED] To: Rick Dettinger [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Wednesday, April 05, 2006 5:32 PM Subject: Re: [Elecraft] K1 VFO frequency range change | I changed the VFO frequency range capacitor to 120 pf and now have | a 178 khz tuning range. | | That's why I've always termed this option as the 180 kHz option rather than Elecraft's 150 kHz characterization. | | Since I only need 125 khz to reach the SKCC frequency of | 7120 khz, I may try a 100 pf capacitor. | | There's a lot more Morse activity above 7120 kHz. To me, that's more than worth the additional VFO span. | | You mentioned having changed out the 30m hetrodyne crystal, which I assume means that your 30m band tuning now starts near 10 MHz. Reducing VFO span to, say, 125 kHz will mean that you'll only be able to cover about the first 20 kHz of the 30m band. | | 73, | Mike / KK5F | ___ | 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 | | | | -- | No virus found in this incoming message. | Checked by AVG Free Edition. | Version: 7.1.385 / Virus Database: 268.3.5/301 - Release Date: 4/4/2006 | | ___ 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
