K1 VFO range
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I am building the K1 with the 4 band filter board. I am at the step
where I must decide which VFO range to choose, 150 kHz or 80 kHz. I am new to HF and don't have the experience to make an educated choice here. I would like to hear from those who have built this receiver and why they made the choice they did. I have tried searching the archives but for some reason I am not getting any hits. Thanks for your replies, Larry KB5DXY _______________________________________________ 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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Hi Larry,
I went with the 150kHz option, personally. I'm not very good at CW, and was more interested in having the extra tuning range so I could tune around and listen. The 80kHz does give you finer-tuning on the dial but personally I'd rather have the wider range. I find it just takes a careful gentle touch on the dial, but it is not hard to tune very precisely even with the 150kHz option. I think it's really a matter of personal preference. Of course, the great thing is you can build for either option, and if you don't like it, you can always go back and change it later! 73 de Stephanie va3uxb > > I am building the K1 with the 4 band filter board. I am at the step > where I must decide which VFO range to choose, 150 kHz or 80 kHz. I > am new to HF and don't have the experience to make an educated > choice here. I would like to hear from those who have built this > receiver and why they made the choice they did. > > I have tried searching the archives but for some reason I am not > getting any hits. > > Thanks for your replies, > > Larry > KB5DXY > 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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In reply to this post by KB5DXY
Larry wrote
>I am building the K1 with the 4 band filter board. I am at the step >where I must decide which VFO range to choose, 150 kHz or 80 kHz. >I would like to hear from those who have built this receiver and why >they made the choice they did. Larry, I've used the 170 kHz (that's what you'll actually get) VFO span on my K1 for the last five years. With the small mod described below, I find it very easy to control. It allows me to cover all of the 40m CW band, and to get 10 MHz WWV on the 30m band. It also allows coverage of most of the CW portion of 15m, which will be more valuable when the solar cycle starts to pick up again in a few years. You'll be able to tune about 20 kHz into the lower part of the 40m phone segment. Since the K1 receiver always functions in LSB mode, it would be possible to have cross-mode QSOs at the lower end of 40m, should the need arise. You will get responses stating how quickly the K1 tunes with the larger span, but 17 kHz/turn is *not* a very rapid tuning rate. What I think most of these folks are actually experiencing is a problem that results from the the VFO potentiometer shaft having very very little resistance to rotation. It is very easy to cause unintended dial adjustment as you remove your fingers from the knob. With a 80 kHz span, the effects of this are far less apparent. The solution is simple. Get a sheet of thin felt material and cut several circular, holed, "washers" which can be laid around the VFO pot shaft, between the back of the VFO knob and the front of the panel. Add just enough layers until you get a very slight resistance to motion, while the knob still remains easy and smooth to turn. Then it will be very easy to let go of the knob without introducing unwanted changes. I would never go back to 80 kHz. 73, Mike / KK5F K1 #175 _______________________________________________ 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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Mike Morrow wrote:
> Larry wrote > >> I am building the K1 with the 4 band filter board. I am at the step >> where I must decide which VFO range to choose, 150 kHz or 80 kHz. >> I would like to hear from those who have built this receiver and why >> they made the choice they did. > I've used the 170 kHz (that's what you'll actually get) VFO span on my K1 for the last five years. With the small mod described below, I find it very easy to control. It allows me to cover all of the 40m CW band, and to get 10 MHz WWV on the 30m band. It also allows coverage of most of the CW portion of 15m, which will be more valuable when the solar cycle starts to pick up again in a few years. You'll be able to tune about 20 kHz into the lower part of the 40m phone segment. Since the K1 receiver always functions in LSB mode, it would be possible to have cross-mode QSOs at the lower end of 40m, should the need arise. > I wonder why I have never seen any mods where a vernier dial has been added to the K1 unit? Reasons.......??? -- GB & 73's KA5OAI Sam Morgan _______________________________________________ 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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In reply to this post by KB5DXY
I built mine originally for 80 khz. With the bands changing and wanting coverage past 7080 on 40
meters, I redid mine for 150 Khz. It is a bit toucher to tune now but much better coverage. I have a 2 band card I built for 160 and 80 meters which resides in my K1 with the coming of good conditions on 160. 73, Sandy W5TVW ----- Original Message ----- From: "Larry" <[hidden email]> To: <[hidden email]> Sent: Friday, September 29, 2006 5:33 PM Subject: [Elecraft] K1 VFO range | I am building the K1 with the 4 band filter board. I am at the step | where I must decide which VFO range to choose, 150 kHz or 80 kHz. I am | new to HF and don't have the experience to make an educated choice here. | I would like to hear from those who have built this receiver and why | they made the choice they did. | | I have tried searching the archives but for some reason I am not getting | any hits. | | Thanks for your replies, | | Larry | KB5DXY | _______________________________________________ | 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 | | | | -- | No virus found in this incoming message. | Checked by AVG Free Edition. | Version: 7.1.407 / Virus Database: 268.12.10/459 - Release Date: 9/29/2006 | | _______________________________________________ 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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In reply to this post by Sam Morgan-2
. > I wonder why I have never seen any mods where a vernier dial has been added to > the K1 unit? Reasons.......??? > > -- > GB & 73's > KA5OAI > Sam Morgan ===================================== The K1 already has a digital dial so I think you mean a vernier drive. Remember that the K1 is tuned with a ten turn pot so that is, in effect, a vernier drive. I started out with 80 khz but changed to 170 khz so I could use the K1 in the novice band to work the skcc gang at 7022 khz. As Mike said, 17 khz per rev. is not a bad tuning rate. I think the top of the line rigs of my youth used 20 or 25 khz rates and that was considered ideal. The only difference, these rigs had larger tuning knobs and a little more friction. I have installed my K2 tuning knob on the K1 and I like it very much. It just clears the clear plastic cover for the readout. It is larger and has brass weights inside. I had to ream out the K2 knob with a Dremel tool in my drill press. The K1 shaft is 1/4 inch and the K2 shaft is 6mm. Then I had to spring for a new knob for the K2. About $26 with shipping. They told me the brass weight is the reason for the high cost. I also tried a Sierra knob. The same size as the K2 knob but no weight. Also, no need to drill out as already 1/4 inch. It worked well but I like the K2 knob better. I am using the metal shaft 10 turn pot on my K1. Its a little nicer but not alot of difference. It may support the heavier knob better. Rick Dettinger K7MW _______________________________________________ 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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In reply to this post by Mike Morrow-3
Mike Morrow wrote:
> Larry wrote > > >> I am building the K1 with the 4 band filter board. I am at the step >> where I must decide which VFO range to choose, 150 kHz or 80 kHz. >> I would like to hear from those who have built this receiver and why >> they made the choice they did. >> > > Larry, > > I've used the 170 kHz (that's what you'll actually get) VFO span on my K1 for the last five years. With the small mod described below, I find it very easy to control. It allows me to cover all of the 40m CW band, and to get 10 MHz WWV on the 30m band. It also allows coverage of most of the CW portion of 15m, which will be more valuable when the solar cycle starts to pick up again in a few years. You'll be able to tune about 20 kHz into the lower part of the 40m phone segment. Since the K1 receiver always functions in LSB mode, it would be possible to have cross-mode QSOs at the lower end of 40m, should the need arise. > > You will get responses stating how quickly the K1 tunes with the larger span, but 17 kHz/turn is *not* a very rapid tuning rate. What I think most of these folks are actually experiencing is a problem that results from the the VFO potentiometer shaft having very very little resistance to rotation. It is very easy to cause unintended dial adjustment as you remove your fingers from the knob. With a 80 kHz span, the effects of this are far less apparent. The solution is simple. Get a sheet of thin felt material and cut several circular, holed, "washers" which can be laid around the VFO pot shaft, between the back of the VFO knob and the front of the panel. Add just enough layers until you get a very slight resistance to motion, while the knob still remains easy and smooth to turn. Then it will be very easy to let go of the knob without introducing unwanted changes. > > I would never go back to 80 kHz. > > 73, > Mike / KK5F > K1 #175 > > I am going to set up my K1 for 170 kHz. Larry KB5DXY _______________________________________________ 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 |
K2 weird behaviour when receiving through SSB filter
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Guys,
Here a problem I don't understand. K2 # 3612 with: NB SSB 20W intrnal tuner The problem: When listening on SSB filter OPT1, 40m band and antenna connected, a bit of bandnoise is present. The S-meter is on S 5-7 or so with no signals around. Signals are clear. When they are strong the S meter functions as it should with those signals. With no signal meter drops back to S 5-7. Switching in the the other filters (width 2.12, 1.87, 1.78) at that time (no signals present) makes the S-meter drop to S 0-1 and bandnoise is more audible and S-meter flickering on QRN and so, as it should I think. It seems that something is triggering the AGC when I switch in the OPT1 filter, but I cannot figure out what it is and why. The funny (?) thing is that if using the OPT1 filter, the s-meter reacts to switching off the pre-amp and switching in the attenuator (as expected) Disconnect the antenna and the s-meter also drops to S 0. I've taken out the NB and the tuner: no change in this behaviour. Sure in need of good advice. Thanks in advance. Arie PA3A _______________________________________________ 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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