[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: 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: 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: | 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]>; 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
