Re: [Elecraft] K2 IF Alignment Question
On Saturday 01 July 2006 00:57, [EMAIL PROTECTED] wrote: > The peak when adjusting L34 during IF alignment is at the top rather than > the l to 1 1/2 turns in mentioned in the manual. Has anyone else encountered > this? > > 73 Steve K8IDN Steve, It seemed like that to me too. I used Spectrogram a couple of days ago having read back to 1999 the Elecraft list archives about tuning L34. Mine behaves strangely. The noise decreases as it approaches the top and then increases at some point, having not reached the top. But screwing it in to lower it doesn't decrease the noise. I have to turn it in a couple of times until the noise is obvious, then unscrew it to the best low noise I've seen and just believe it's the best - it seems to be approachable only by unscrewing towards the top. I read in the archives that some K2s need a 150 pF capacitor in place of the current 180 pF. It's not a well defined alignment procedure, especially with the guru, Don Wilhelm saying, " just set the slug at 1 turn from the top and let it go at that" Ian, G4ICV, AB2GR, K2 #4962 -- ___ 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] K2 IF Alignment Question
I also found this procedure slightly confusing when I was going through it yesterday. The manual tells you to use a DMM to measure AC volts in the speaker out socket as an alternative to by ear assessment. I could measure the audio volts out ok but it did not tell me anything about the signal to noise ratio. I found that the 'birdie' on about 7000 is easier to detect if you have the tuning steps set to fine (0.1 or 0.01 khz) as otherwise you can tune right past it if the step is set to 1 khz. In the end I settled for just leaving the slug turned about 1 turn in, the birdie sounded quite loud and clear at that setting. Turning it further did seem to bring up the noise slightly. 73, Wyn VR2AX Are we speaking of the same L34? Mine "peaked" at nearly the top, not a turn or so from the top. As I remember I was peaking for the loudness of the noise; nary a signal around. de Joe, aa4nn ___ 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] K2 IF Alignment Question
The 'peak' on L34 is very broad and difficult to discern. It ideally should be adjusted for the best signal to noise ratio. If you use the 7000 KHz 'birdie' (no antenna connected), you can usually hear the signal peak especially if you listen for the noise to minimize. A Spectrogram display will also show it if you look for the maximum signal amplitude that is also consistent with minimum noise. Yes look first for the peak at the 1 to 1 1/2 turns from the top, but if you are unable to discern it, just set the slug at 1 turn from the top and let it go at that. 73, Don W3FPR > -Original Message- > > Are we speaking of the same L34? Mine "peaked" at nearly the top, > not a turn or so from the top. As I remember I was peaking for the > loudness of the noise; nary a signal around. > de Joe, aa4nn > --- > > You are not adjusting for the peak, you are adjusting for the maximum > > signal/noise. It does not occur at the peak signal. Unless you are using > > Spectrogram or some such, it is a trick to do by ear. > > > > That said, if your best S/N is at the top, I haven't a clue if > you have a > > problem. > > > > > > The peak when adjusting L34 during IF alignment is at the top rather > > than > > the l to 1 1/2 turns in mentioned in the manual. Has anyone else > > encountered > > this? > > > > 73 Steve K8IDN > ___ 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] K2 IF Alignment Question
Are we speaking of the same L34? Mine "peaked" at nearly the top, not a turn or so from the top. As I remember I was peaking for the loudness of the noise; nary a signal around. de Joe, aa4nn --- - Original Message - From: "Dan Barker" <[EMAIL PROTECTED]> To: Sent: Saturday, July 01, 2006 6:49 AM Subject: RE: [Elecraft] K2 IF Alignment Question You are not adjusting for the peak, you are adjusting for the maximum signal/noise. It does not occur at the peak signal. Unless you are using Spectrogram or some such, it is a trick to do by ear. That said, if your best S/N is at the top, I haven't a clue if you have a problem. Dan / WG4S / K2 #2456 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Saturday, July 01, 2006 12:57 AM To: Elecraft@mailman.qth.net Subject: [Elecraft] K2 IF Alignment Question The peak when adjusting L34 during IF alignment is at the top rather than the l to 1 1/2 turns in mentioned in the manual. Has anyone else encountered this? 73 Steve K8IDN ___ 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] K2 IF Alignment Question
You are not adjusting for the peak, you are adjusting for the maximum signal/noise. It does not occur at the peak signal. Unless you are using Spectrogram or some such, it is a trick to do by ear. That said, if your best S/N is at the top, I haven't a clue if you have a problem. Dan / WG4S / K2 #2456 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Saturday, July 01, 2006 12:57 AM To: Elecraft@mailman.qth.net Subject: [Elecraft] K2 IF Alignment Question The peak when adjusting L34 during IF alignment is at the top rather than the l to 1 1/2 turns in mentioned in the manual. Has anyone else encountered this? 73 Steve K8IDN ___ 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] K2 IF Alignment question
If you look at the signal on Spectrogram or something similar, you'll see there is a different in the signal-to-noise ratio as you adjust L34 as well. The best S/N seems to coincide with the very broad peak, however. I've most often described that peak as "subtle". Ron AC7AC -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vic K2VCO Sent: Thursday, November 24, 2005 9:14 AM To: [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 IF Alignment question [EMAIL PROTECTED] wrote: > Happy Turkey Day to all, > > Symptom: In aligning the IF Amp on K2 #5091, I am not hearing any > signal strength variation when adjusting L34 per the instructions on > pg. 62. The weak signal near 7000 khz is relatively loud but moving > the slug doesn't result in any variation that I can hear. There is very little variation when adjusting L34, but you should notice it. The peak is usually quite close to the top of the slug's travel. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ 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] K2 IF Alignment question
[EMAIL PROTECTED] wrote: Happy Turkey Day to all, Symptom: In aligning the IF Amp on K2 #5091, I am not hearing any signal strength variation when adjusting L34 per the instructions on pg. 62. The weak signal near 7000 khz is relatively loud but moving the slug doesn't result in any variation that I can hear. There is very little variation when adjusting L34, but you should notice it. The peak is usually quite close to the top of the slug's travel. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ 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] K2 IF Alignment question
Symptom: In aligning the IF Amp on K2 #5091, I am not hearing any signal strength variation when adjusting L34 per the instructions on pg. 62. The weak signal near 7000 khz is relatively loud but moving the slug doesn't result in any variation that I can hear. I can peak signals with L1 and L2 for the 40m bandpass alignment. And actual band signals seem the same signal strength when compared to an ICom 746. All resistance test readings and all other alignment tests are within range. Guy: I have built fourteen K2s and have never really seen a significant peak in the adjustment of L34. The true peak has to be observed by using an ac voltmeter connected to the audio output. Most of them peak about a half a turn in from the top. 73 Jim K4ZM ___ 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
