K2 v. K1
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Ron, AC7AC, said:
The K2 does this by using a PLL that tunes in about 5 kHz "steps" and then varies the PLL reference oscillator's frequency to tune smoothly in between those steps. So the tuning has the true smooth feel and spectral purity . I say: When I tune my K2 past a signal, I can hear the steps. I also sometimes think I can hear steps when I tune my K1 thru a signal. I assumed that this is due to the nature of the multiturn pot. I think it is wire wound and that the wiper cuts the wire turns suddenly. It could also be due to jerky tuning , in spite of efforts to the contrary. It is very subtle, unlike the K2. Give me a smooth PTO with the K2 signal path. My long term idea is to build a stable analog VFO, using my Sierra band modules for premixing, to drive my K2. Rick - 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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I assume you are saying that you'd like to have a smoother VFO for the local
oscillator in your K1! The K2 does NOT use a "multiturn pot" for the VFO. A K1 does. The K1 is a totally different rig. The K2 uses a high-quality optical encoder for the main tuning. Ron AC7AC -----Original Message----- Ron, AC7AC, said: The K2 does this by using a PLL that tunes in about 5 kHz "steps" and then varies the PLL reference oscillator's frequency to tune smoothly in between those steps. So the tuning has the true smooth feel and spectral purity . I say: When I tune my K2 past a signal, I can hear the steps. I also sometimes think I can hear steps when I tune my K1 thru a signal. I assumed that this is due to the nature of the multiturn pot. I think it is wire wound and that the wiper cuts the wire turns suddenly. It could also be due to jerky tuning , in spite of efforts to the contrary. It is very subtle, unlike the K2. Give me a smooth PTO with the K2 signal path. My long term idea is to build a stable analog VFO, using my Sierra band modules for premixing, to drive my K2. Rick - 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 Rick Dettinger-2
On Thu, 23 Feb 2006, Rick Dettinger wrote:
> Ron, AC7AC, said: > The K2 does this by using a > PLL that tunes in about 5 kHz "steps" and then varies the PLL reference > oscillator's frequency to tune smoothly in between those steps. So the > tuning has the true smooth feel and spectral purity . > I say: > When I tune my K2 past a signal, I can hear the steps. I also sometimes think I can hear steps when I tune my K1 thru a signal. I assumed that this is due to the nature of the multiturn pot. I think it is wire wound and that the wiper cuts the wire turns suddenly. It could also be due to jerky tuning , in spite of efforts to the contrary. It is very subtle, unlike the K2. Give me a smooth PTO with the K2 signal path. My long term idea is to build a stable analog VFO, using my Sierra band modules for premixing, to drive my K2. Rick - K7MW I thought you were going to talk about the problem that occurs when RFC15 is open. Then you can REALLY hear the steps. Mine went "bloop bloop bloop" at would lose and regain lock with each step. -- Hisashi T Fujinaka - [hidden email] BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte _______________________________________________ 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 Ron D'Eau Claire-2
When I have the K2 set for the 10 Hz tuning it sounds pretty smooth
to me, but if I have it set for the 50 Hz tuning (as I usually do) I can very clearly hear the steps as I tune up or down past a CW signal. I've also heard that on my K1; with very narrow signals and while tuning very, very slowly, you can sort of hear the wiper moving. The tone steps up or down. I know they're totally different rigs and tuning methods, but the resultant sound can be similar. 73 de Stephanie va3uxb K2#5311 - K1#2132 On 23-Feb-06, at 16.01 .51, Ron D'Eau Claire wrote: > I assume you are saying that you'd like to have a smoother VFO for > the local > oscillator in your K1! > > The K2 does NOT use a "multiturn pot" for the VFO. A K1 does. The > K1 is a > totally different rig. The K2 uses a high-quality optical encoder > for the > main tuning. > > Ron AC7AC > > I say: > When I tune my K2 past a signal, I can hear the steps. 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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On Thursday 23 February 2006 16:24, Stephanie Maks wrote:
> When I have the K2 set for the 10 Hz tuning it sounds pretty smooth > to me, but if I have it set for the 50 Hz tuning (as I usually do) I > can very clearly hear the steps as I tune up or down past a CW signal. My K2 sounds continuous at 10 Hz only when tuning quickly. I can hear the steps easily on moving the knob slightly to a frequency 10 Hz higher or lower. 10 Hz with a BFO frequency of 600 Hz isn't as wide as a semitone, but it's an obvious step to me. Ian, G4ICV, AB2GR, K2 #4962 -- _______________________________________________ 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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I stand corrected!
While the K2's local oscillator moves in an analogue fashion, the encoder steps under the control of the optical encoder according to the tuning rate setting. The minimum tuning rate is 10 Hz. And, as Stephanie (VA3UXB) observed, if one chooses a larger tuning rate, the step rate moves up with it. Even though the PLL's reference oscillator is tuned by an analogue voltage, that voltage is developed in the digital circuits that moves it in step increments. Ron AC7AC -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ian Stirling Sent: Thursday, February 23, 2006 1:46 PM To: [hidden email] Subject: Re: [Elecraft] K2 v. K1 On Thursday 23 February 2006 16:24, Stephanie Maks wrote: > When I have the K2 set for the 10 Hz tuning it sounds pretty smooth > to me, but if I have it set for the 50 Hz tuning (as I usually do) I > can very clearly hear the steps as I tune up or down past a CW signal. My K2 sounds continuous at 10 Hz only when tuning quickly. I can hear the steps easily on moving the knob slightly to a frequency 10 Hz higher or lower. 10 Hz with a BFO frequency of 600 Hz isn't as wide as a semitone, but it's an obvious step to me. Ian, G4ICV, AB2GR, K2 #4962 -- _ _______________________________________________ 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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Elecrafters:
I have a prefabricated (West Mountain) power lead made of zip cord consisting of No 10 stranded cables. It is 6 feet long and has factory installed Anderson power poles on one end and factory installed 1/4 inch ring connectors on the other. Is this cable heavy enough to connect my power supply to a K2/100? 73, Steve AA4AK K2 # 5383 (almost in hand) _______________________________________________ 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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Stephen W. Kercel wrote:
> Elecrafters: > > I have a prefabricated (West Mountain) power lead made of zip cord > consisting of No 10 stranded cables. It is 6 feet long and has factory > installed Anderson power poles on one end and factory installed 1/4 inch > ring connectors on the other. > > Is this cable heavy enough to connect my power supply to a K2/100? Yes. 6 feet of no. 10 should have a resistance of 0.007 ohms, so at 20 amps the voltage drop will be 0.14 volt. As far as heat dissipation, no. 10 is spec'd for use in cables at up to 33 amps. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ 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 Ron D'Eau Claire-2
Actually, I am quite happy with my K1 tuning. It is the one area where I
like the K1 better than the K2. I like the smooth, analog tuning of the K1. I replaced the original multiturn pot with the metal shaft one that Don Brown recommended. The tuning is the same, though. It just gives the tuning knob a nicer feel without the wobble. I would like the K2 better if it had a one speed analog VFO, thus my comment about building a VFO to use with the K2. Rick - K7MW ----- Original Message ----- From: "Ron D'Eau Claire" <[hidden email]> To: "'Rick Dettinger'" <[hidden email]>; <[hidden email]> Sent: Thursday, February 23, 2006 1:01 PM Subject: RE: [Elecraft] K2 v. K1 I assume you are saying that you'd like to have a smoother VFO for the local oscillator in your K1! The K2 does NOT use a "multiturn pot" for the VFO. A K1 does. The K1 is a totally different rig. The K2 uses a high-quality optical encoder for the main tuning. Ron AC7AC -----Original Message----- Ron, AC7AC, said: The K2 does this by using a PLL that tunes in about 5 kHz "steps" and then varies the PLL reference oscillator's frequency to tune smoothly in between those steps. So the tuning has the true smooth feel and spectral purity . I say: When I tune my K2 past a signal, I can hear the steps. I also sometimes think I can hear steps when I tune my K1 thru a signal. I assumed that this is due to the nature of the multiturn pot. I think it is wire wound and that the wiper cuts the wire turns suddenly. It could also be due to jerky tuning , in spite of efforts to the contrary. It is very subtle, unlike the K2. Give me a smooth PTO with the K2 signal path. My long term idea is to build a stable analog VFO, using my Sierra band modules for premixing, to drive my K2. Rick - 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 Vic K2VCO
Thanks for the many comments. The 6 foot length was my real concern.
If the K2 can live with the .14 volt drop then all is well. 73, Steve AA4AK K2 # 5383 (almost in hand) At 05:24 PM 2/23/2006, Vic Rosenthal wrote: >Stephen W. Kercel wrote: >>Elecrafters: >>I have a prefabricated (West Mountain) power lead made of zip cord >>consisting of No 10 stranded cables. It is 6 feet long and has >>factory installed Anderson power poles on one end and factory >>installed 1/4 inch ring connectors on the other. >>Is this cable heavy enough to connect my power supply to a K2/100? > >Yes. 6 feet of no. 10 should have a resistance of 0.007 ohms, so at 20 >amps the voltage drop will be 0.14 volt. As far as heat dissipation, >no. 10 is spec'd for use in cables at up to 33 amps. >-- >73, >Vic, K2VCO >Fresno CA >http://www.qsl.net/k2vco > >_______________________________________________ >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 _______________________________________________ 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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