Re: [Elecraft] Adjustment of L34 on a K2
Charlie: I have done this 2 days ago and the same thing happened to me (I am still on part II). L34 is on top of the can for the peak signal/noise. I cannot give you any technical explanation for this but I am sure some of the guys on the Reflector will. I will be liestening, that is for sure. I have my 40 meters only receiver on since yesterday and I am absolutely amazed with the receiver. 73 Manuel LU5OM CT4IK # 5310 - Original Message - From: Charlie, W0YG [EMAIL PROTECTED] To: Elecraft Reflector elecraft@mailman.qth.net Sent: Sunday, February 26, 2006 11:51 AM Subject: [Elecraft] Adjustment of L34 on a K2 On a K2, how critical is the adjustment of L34? This is an adjustment that peaks the IF amplifier. The manual states a peak should be found one turn of the slug down from the top however mine seams to be peaking right at the top of the can. Actually, I cannot go through the peak as it just gets louder with the slug all the way at the top. The adjustment in question is on page 64 of the K2 manual, IF Amplifier Alignment. I thought I would revisit this after completing alignment as I have done 40M alignment on that same page as well as done the transmitter alignment. Just trying to peak and tweak to be sure everything is maxed out! 73, Charlie, W0YG.. ___ 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 __ Información de NOD32 1.1418 (20060224) __ Este mensaje ha sido analizado con NOD32 Antivirus System http://www.nod32.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] Adjustment of L34 on a K2
Charlie Here is a technique I used to adjust L34 - While performing the I.F. Amplifier Alignment section of Alignment and Test Part II, I used Spectrogram (just about any program that displays the received signals should work). I had meant to put this hint on the reflector long ago and keep forgetting. Follow the instructions for I.F. Amplifier Alignment. When you get to the last step plug the PC sound card into the Speaker Jack (not Headphone as it attenuates some high frequencies - but it probably don't make that much difference). You will notice some noise spread across the spectrum displayed. Make sure the XFIL is set for FL-1 OP-1. Now continue to adjust L34 for a compromise of the lowest displayed noise and the highest level of the tone (signal). You will find a point where the noise is almost non existent. Even though I had adjusted this to what I thought was the best by ear, after using this method and then re-adjusting the AGC threshold, I was amazed at the difference in sensitivity and audio level (I think the noise de-senses the AGC - perhaps the experts can explain this). Maybe this is one of the problems/reasons some people complain about low output volume. Rich, KE0X -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charlie, W0YG Sent: Sunday, February 26, 2006 8:52 AM To: Elecraft Reflector Subject: [Elecraft] Adjustment of L34 on a K2 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.0/269 - Release Date: 2/24/2006 ___ 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] Adjustment of L34 on a K2
Charlie Here is a technique I used to adjust L34 - While performing the I.F. Amplifier Alignment section of Alignment and Test Part II, I used Spectrogram (just about any program that displays the received signals should work). I had meant to put this hint on the reflector long ago and keep forgetting. Follow the instructions for I.F. Amplifier Alignment. When you get to the last step plug the PC sound card into the Speaker Jack (not Headphone as it attenuates some high frequencies - but it probably don't make that much difference). You will notice some noise spread across the spectrum displayed. Make sure the XFIL is set for FL-1 OP-1. Now continue to adjust L34 for a compromise of the lowest displayed noise and the highest level of the tone (signal). You will find a point where the noise is almost non existent. Even though I had adjusted this to what I thought was the best by ear, after using this method and then re-adjusting the AGC threshold, I was amazed at the difference in sensitivity and audio level (I think the noise de-senses the AGC - perhaps the experts can explain this). Maybe this is one of the problems/reasons some people complain about low output volume. Rich, KE0X -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charlie, W0YG Sent: Sunday, February 26, 2006 8:52 AM To: Elecraft Reflector Subject: [Elecraft] Adjustment of L34 on a K2 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.0/269 - Release Date: 2/24/2006 ___ 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] Adjustment of L34 on a K2
And if you wind the slug out a bit further? It's not normally necessary to stop winding just because the slug is level with the top of the can. Or possibly you've got a too high value capacitor across the coil? Charlie, W0YG wrote: Actually, I cannot go through the peak as it just gets louder with the slug all the way at the top. -- Nigel A. Gunn. 59 Beadlemead, Milton Keynes, MK6 4HF, England. Tel +44 (0)1908 604004 mobile +44 (0)7765 471661 e-mail [EMAIL PROTECTED] www http://www.ngunn.net Amateur radio stations G8IFF, KC8NHF Member of AMSAT-UK #182, ARRL, GQRP Club, QRPARCI, SOC #548, RAYNET Flying Pig #385, Dayton ARA #2128, AMSAT-NA LM-1691, MKARS ___ 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
