Re: [Elecraft] Peaking L34 (IF amplifier)
On Mon, Nov 20, 2006 at 07:46:19AM -0600, Tom Hammond wrote: David: Did it go pretty much as we had described? Any problems? I used Xanalyser and just cranked it counterclockwise until it hit the top of the can and then backed it off. It is possible there was a broad peak, but it was hard to see indeed. Thanks. Cheers, Tom N0SS At 12:54 AM 11/20/2006, you wrote: It is done. Thanks. On Sat, Nov 18, 2006 at 08:09:35PM -0500, Don Wilhelm wrote: Ron is quite correct. If no peak can be discerned, just set the slug 1 to 1 1/2 turns in from the top of the can and be satisfied - alternately, as Ron stated, 'in the general vicinity of the peak'. -- David Dawson A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster ___ 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] Peaking L34 (IF amplifier)
On Mon, Nov 20, 2006 at 07:46:19AM -0600, Tom Hammond wrote: David: Did it go pretty much as we had described? Any problems? I was not feeling well this morning and so didn't think so fast. I understand the point about s/n and it wouldn't hurt to take another look at the situation, although I don't think I need to adjust it much. Anyway it is an easy procedure. Thanks. Cheers, Tom N0SS At 12:54 AM 11/20/2006, you wrote: It is done. Thanks. On Sat, Nov 18, 2006 at 08:09:35PM -0500, Don Wilhelm wrote: Ron is quite correct. If no peak can be discerned, just set the slug 1 to 1 1/2 turns in from the top of the can and be satisfied - alternately, as Ron stated, 'in the general vicinity of the peak'. -- David Dawson A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster ___ 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] Peaking L34 (IF amplifier)
On Sun, Nov 19, 2006 at 09:19:34AM -0600, Tom Hammond wrote: David: For finding the peak, either will work, however, for finding the best Signal-to-noise ratio, the xanalyser will probably be better because it should allow you to see both the signal AND the background noise, so you can tell when he background noise is dropping faster than the signal. That's what I thought. That should be fairly easy for me to set up. The s/n ratio setting is usually only about 1/2-3/4 turn in from the point of max received signal. Run thru it a few times, to make sue you're seeing what you think you're seeing... and if you can't see it, try to hit the point of max. rx sig and then turn the slug in about 1/2 turn. Yes, that is what I did. Thanks. 73, Tom -- David Dawson A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster ___ 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] Peaking L34 (IF amplifier)
It is done. Thanks. On Sat, Nov 18, 2006 at 08:09:35PM -0500, Don Wilhelm wrote: Ron is quite correct. If no peak can be discerned, just set the slug 1 to 1 1/2 turns in from the top of the can and be satisfied - alternately, as Ron stated, 'in the general vicinity of the peak'. 73, Don W3FPR -Original Message- It's important to remember that the effect of L34 on the performance of the K2 is as subtle as the peak. That is, the effect on receiver performance is negligible as long as L34 is set somewhere in the general vicinity of the peak. Ron AC7AC ___ 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 -- David Dawson A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster ___ 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] Peaking L34 (IF amplifier)
David, Yes, the peak is VERY broad. You may have to connect an AC voltmeter across the speaker connector to find the peak if you cannot discern it by ear. The peak is normally 1 to 1 1/2 turns down from the top of the can. Be certain you are using CW mode. If your peak is right at the top of the can, check the value of C182. 73, Don W3FPR -Original Message- First, I took Don Wilhelm;s advice about checking soldering and re-did anything I could find that looked dubious. Now, I've come to peak the IF amplifier. It seems to me that a signal just gets louder when I turn the slug counter-clockwise until it hits the stop and quieter turning the slug clockwise. If there was a peak, it was a really shallow one. I followed the instructions and could hear the internal birdie quite well, so peaking should not have been difficult. Any suggestions, please? Thanks. -- David Dawson ___ 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] Peaking L34 (IF amplifier)
On Sat, Nov 18, 2006 at 07:32:44AM -0500, Don Wilhelm wrote: David, Yes, the peak is VERY broad. You may have to connect an AC voltmeter across the speaker connector to find the peak if you cannot discern it by ear. The peak is normally 1 to 1 1/2 turns down from the top of the can. Be certain you are using CW mode. If your peak is right at the top of the can, check the value of C182. C182 is a fairly big yellow disk ceramic marked '181', if that is correct, then I guess I don't have a problem? I have a software audio analyser (xanalyser) which I could use to find the peak and I have a DMM which should measure audio frequencies just fine (It has a range of 0 - 4MHz as a frequency counter). Which would be preferable? 73, Don W3FPR -Original Message- First, I took Don Wilhelm;s advice about checking soldering and re-did anything I could find that looked dubious. Now, I've come to peak the IF amplifier. It seems to me that a signal just gets louder when I turn the slug counter-clockwise until it hits the stop and quieter turning the slug clockwise. If there was a peak, it was a really shallow one. I followed the instructions and could hear the internal birdie quite well, so peaking should not have been difficult. Any suggestions, please? Thanks. -- David Dawson -- David Dawson A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster ___ 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] Peaking L34 (IF amplifier)
David, It sounds like either will work fine - use the one that is more convenient and does the job. 73, Don W3FPR -Original Message- I have a software audio analyser (xanalyser) which I could use to find the peak and I have a DMM which should measure audio frequencies just fine (It has a range of 0 - 4MHz as a frequency counter). Which would be preferable? ___ 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] Peaking L34 (IF amplifier)
On Sat, Nov 18, 2006 at 10:55:12PM -0600, Tom Hammond wrote: David: For finding the peak, either will work, however, for finding the best Signal-to-noise ratio, the xanalyser will probably be better because it should allow you to see both the signal AND the background noise, so you can tell when he background noise is dropping faster than the signal. That's what I thought. That should be fairly easy for me to set up. Thanks. 73, Tom N0SS -- David Dawson A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster ___ 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
