[Elecraft] Raspy Audio from K2
John - I saw your message on the ECraft reflector. I have tried exactly the same thing in my shack, and I always will hear a raspy audio sound, even from perfectly functioning rigs that get FB on air reports. I have never had time to track down exactly what is happening, but don't get wrapped around the axle too much. I suspect it has something to do with a combination of the extreme sensitivity of a ham rig, and the dummy load consuming the actual modulated output of the rig under test, leaving mostly leakage products and funny IM from things that only travel a few feet for the listening rig to hear. Try it on the air before you get too deep into troubleshooting. 73, Bill K4DXU KX1 #702 K2 #5540 Message: 2 Date: Wed, 13 Dec 2006 06:14:58 -0600 From: John R. Lonigro [EMAIL PROTECTED] Subject: [Elecraft] Raspy audio from K2 To: Elecraft@mailman.qth.net Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed I recently finished building the KSB2 and did the alignment on the filters. Everything seems to be working as advertised, except on transmit my voice sounds raspy. I haven't had time to dig into the problem yet, but I did try 3 separate mics and got the same result. For my test, I transmitted at 1 Watt into a dummy load while listening on my Icom 706 with headphones. My first assumption is that I simply need to tweak the transmit filter, but I'm asking if anyone else has had the same symptom that was perhaps caused by something else. For example, is it possible the two radios are simply too close to each other for a good audio test? They are on separate supplies and were about 6 feet apart during the test. Thanks and 73's, John AA0VE K2#3401 ___ 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] For what it may be worth
OF ALL THE DUB THINGS I DO... MY WEB PAGE IS AT WWW.N0SS.NET !!! Sorry. Obviously, head left at wrong end of body last night! Tom __ Doug Person wrote: Tom, for those of us not familiar with your site - could provide a link? Thanks Doug -- KØDXV Tom Hammond wrote: Sometimes we tend to forget things... I forgot that not everyone had access to a broadband Internet connection... as a result, I continued to add (mercilessly, I must add) items to my web site... ALL on the main page, creating a monster which must have had some folks pulling out all remaining hairs from their heads just waiting for everything to download. I've now tried to correct some of that... I've re-worked the main page, broken it into 5-6 separate pages, more or less by topic, with the hope that you will be able to more readily get to those sections of the site that you really want to access. The following pages are available below: General Amateur Radio Files - Construction/Modification Projects, Reference / Info Files, more specifically, ALL files NOT related to Elecraft Kits. Elecraft Kits (General) - Files regarding: Searchable Parts Layouts for the K2, KPA100, K1, and KX1 Broadband Noise Generator You Can Build - For Xtal Filter Alignment Elecraft K2-Related Files - Files specific to the K2 Elecraft K1 KX1-Related Files - Files specific to the K1 KX1 SCANS of Elecraft Kit PC Boards (top bottom, for troubleshooting) General QRP-Related Files When you have nothing better to do, please visit my site and see if things are a bit easier to navigate. And, if you find ANY problems accessing files, or anything that's supposed to be there, but isn't... PLEASE let me know as soon as possible 73, Tom N0SS ___ 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
[Elecraft] Progressive Problem......
Board Members, K2 Serial Number 3479 needs help. Over the past couple of months an odd little quirk developed. When turned on the rig would do one of two things.. after about 10-20 seconds the rig would jump from filter setting SF1 to SF4. This would happen by itself after being turned on and started to warm up. Occasionally - it did not happen in the first 10-20 seconds BUT it would happen when I would touch the volume control or power control or rf gain control or any of the push button on the front panel. So either way it would (by itself or with me adjusting one of the control) it would move from SF1 setting to the SF4 setting. It had done this for about a two months. I let it go because I figured it was just a odd thing that developed with the rig. NOW the rig is doing this and I have lost control of the power output. On 10 meters with the power output the display reads 1 thru 100 watts out but in reality with a meter in line the output is only 5 watts or 100 watts depending if I am in the low power (10 watts) or in the high power (100 watt) section of the power adjustment control. There is nothing in between. It gives 5 watts or 100 watts - depending only on if the dial is in the high or low setting section. No control even though the K2 display is showing various settings different than 5 watts or 100 watts. Further ... On 20 40 and 80 meters during my initial test the output was only 20 watts. Today I checked it and 20 is showing 100 watts out with no control and on 40 it is showing 125 watts out on an inline meter with the K2 display showing 25 watts out. So the actual forward power is way off from the display and there is no control forward power on the K2. And the receive of the K2 is affected by the power adjustment knob. In the high power section of the power knob the receive and noise floor drops a couple of s units from the low power section of the power knob adjustment. It seems to be much more sensitive in the low power setting than the high power setting. Prior to this rig number 3479 was a perfectly functioning radio. To me - this is sounding like a software problem but I honestly do not know were to begin. Any ideas or anyone who may have had similar problems offering suggestions on some direction would sure be appreciated. Thanks Paul K8QT Serial Number 3479 ___ 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] KDSP2 questions
I assume you mean the rtc (real-time clock). It is on (or at least starts out that way, with power on). However, after some time of operation, I get not inst. The DSP filters work fine-- I just can't call them up in the menu to edit them or make changes without doing the power on/off. Is this a recent or early KDSP2? Is it used in a post s/n 3000 K2? Is there a KAT-100 attached? 73, Lyle KK7P ___ 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] K6XX Visual CW Indicator Kit
Hello all, To all who order a K6XX CW Visual Indicator Kit from me. All future orders will include: K2: 93.1K SMD resistor option (stops false blinking) KX1: 47K resistor divider on audio input line. http://www.wa3wsj.com/K6XXcwInd.html 72, Ed,WA3WSJ ___ 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] Progressive Problem......
It does sound like a software/firmware problem except that the firmware isn't changing on its own, so something else associated with it is. First I'd pull the control board and inspect it very carefully with a powerful magnifier - especially the MCU socket and associated connections - for missed solder joints that may now be becoming intermittent as oxidation accumulates. Ron AC7AC -Original Message- Board Members, K2 Serial Number 3479 needs help. Over the past couple of months an odd little quirk developed. When turned on the rig would do one of two things.. after about 10-20 seconds the rig would jump from filter setting SF1 to SF4. This would happen by itself after being turned on and started to warm up. Occasionally - it did not happen in the first 10-20 seconds BUT it would happen when I would touch the volume control or power control or rf gain control or any of the push button on the front panel. So either way it would (by itself or with me adjusting one of the control) it would move from SF1 setting to the SF4 setting. It had done this for about a two months. I let it go because I figured it was just a odd thing that developed with the rig. NOW the rig is doing this and I have lost control of the power output. On 10 meters with the power output the display reads 1 thru 100 watts out but in reality with a meter in line the output is only 5 watts or 100 watts depending if I am in the low power (10 watts) or in the high power (100 watt) section of the power adjustment control. There is nothing in between. It gives 5 watts or 100 watts - depending only on if the dial is in the high or low setting section. No control even though the K2 display is showing various settings different than 5 watts or 100 watts. Further ... On 20 40 and 80 meters during my initial test the output was only 20 watts. Today I checked it and 20 is showing 100 watts out with no control and on 40 it is showing 125 watts out on an inline meter with the K2 display showing 25 watts out. So the actual forward power is way off from the display and there is no control forward power on the K2. And the receive of the K2 is affected by the power adjustment knob. In the high power section of the power knob the receive and noise floor drops a couple of s units from the low power section of the power knob adjustment. It seems to be much more sensitive in the low power setting than the high power setting. Prior to this rig number 3479 was a perfectly functioning radio. To me - this is sounding like a software problem but I honestly do not know were to begin. Any ideas or anyone who may have had similar problems offering suggestions on some direction would sure be appreciated. Thanks Paul K8QT Serial Number 3479 ___ 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] K1 Receives as good or better than K2
Hi Steve, What do you mean by better. K1 is louder than K2? K1 is more sensitive (i.e. detects weaker signals) than the K2? K1's front end doesn't fold up when there's a S9+30 signal 500 Hz away? I had a K1 and now have a K2. I did NOT get a chance to compare them head to head but my memory is that the K2 is a much better receiver than the K1. Better in that is can detect weak signals, decode them for you and continue to do it well under varying band and QRM conditions. If I were you, I'd put both rigs side by side hooked to the same antenna (don't transmit!) and if possible, with both headphone outputs feeding a mixer and a single pair of headphones. Then tune both rigs to the same signal and switch back and forth on the mixer. Which one really sounds better? Adjust the volume controls so they are the same volume in your headphones. Listen to some very weak signals. Listen to strong signals. Then you'll have a much better idea of how they compare and whether or not the K2 has a problem. - Keith N1AS - - K2 5411.ssb.100 - -Original Message- Steve Watkins said: It just seems that the K1 is receiving a bit better than the K2. Heck, maybe the K1 is just that good and out hears the K2? Steve NE7RD ___ 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] Progressive Problem......
Paul, Something is loose - perhaps an unsoldered connection. Unfortunately, things like that are difficult to locate, especially if the problem goes away when you touch something - sometimes you think it is fixed only to find it back later. Since it reacts when you touch most anything on the Front Panel, I sould examine the front panel board first (and perhaps even re-flow the soldering). The control board would be the second suspect since it is right there close to the Front Panel. Of course, check the connectors between the front panel and RF board and also the control board connectors. 73, Don W3FPR -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Paul Sent: Thursday, December 14, 2006 10:37 AM To: elecraft@mailman.qth.net Subject: [Elecraft] Progressive Problem.. Board Members, K2 Serial Number 3479 needs help. Over the past couple of months an odd little quirk developed. When turned on the rig would do one of two things.. after about 10-20 seconds the rig would jump from filter setting SF1 to SF4. This would happen by itself after being turned on and started to warm up. Occasionally - it did not happen in the first 10-20 seconds BUT it would happen when I would touch the volume control or power control or rf gain control or any of the push button on the front panel. So either way it would (by itself or with me adjusting one of the control) it would move from SF1 setting to the SF4 setting. It had done this for about a two months. I let it go because I figured it was just a odd thing that developed with the rig. NOW the rig is doing this and I have lost control of the power output. On 10 meters with the power output the display reads 1 thru 100 watts out but in reality with a meter in line the output is only 5 watts or 100 watts depending if I am in the low power (10 watts) or in the high power (100 watt) section of the power adjustment control. There is nothing in between. It gives 5 watts or 100 watts - depending only on if the dial is in the high or low setting section. No control even though the K2 display is showing various settings different than 5 watts or 100 watts. Further ... On 20 40 and 80 meters during my initial test the output was only 20 watts. Today I checked it and 20 is showing 100 watts out with no control and on 40 it is showing 125 watts out on an inline meter with the K2 display showing 25 watts out. So the actual forward power is way off from the display and there is no control forward power on the K2. And the receive of the K2 is affected by the power adjustment knob. In the high power section of the power knob the receive and noise floor drops a couple of s units from the low power section of the power knob adjustment. It seems to be much more sensitive in the low power setting than the high power setting. Prior to this rig number 3479 was a perfectly functioning radio. To me - this is sounding like a software problem but I honestly do not know were to begin. Any ideas or anyone who may have had similar problems offering suggestions on some direction would sure be appreciated. Thanks Paul K8QT Serial Number 3479 ___ 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.18/585 - Release Date: 12/13/2006 11:49 AM -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.18/586 - Release Date: 12/13/2006 6:13 PM ___ 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] Solvent
For an example of what damage can be done, I am restoring a Tek SC504 oscilloscope where someone used contact cleaner/solvent on the channel 2 attenuator. This caused corrosion of contacts and debonding between contacts and carrier. It is fixable, but I sure wish some tech in the past hadn't taken the quick route of spraying chemicals inside precision electronics. I am cleaning it up with alcohol. Howard W1WF -Original Message- From: Ron D'Eau Claire [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 13, 2006 9:44 AM To: 'Elecraft' Subject: RE: [Elecraft] Solvent I'm sure others will suggest many options although if you read the Elecraft manuals you'll find, in bold type: DO NOT use ... solvents of any kind. Use of any of these will void your warranty. If you need to clean your boards you're probably using too much solder. Try a smaller diameter solder. If you look at the photos of assembled boards in any of several Elecraft assembly manuals including the XV 50, 144, 222 or 432 transverters, the KX1, the T1 antenna tuner or the WM1, AT1 or AF1 mini-modules, you'll see boards I built up while writing the assembly procedures for those kits. Those photos are the boards as they came from the soldering iron. If you look closely, you might see a few dark spots of flux here and there, but they're tiny and insignificant and often in a place where I installed and removed a part several times as the design was finalized. To be certain the kit can be built exactly as described, I never use any tools that are not specifically listed in the manual. That means no fancy high-powered vacuum desoldering tool to clean up pads; just braid or the SoldapulltR sucker listed under Tools Required. I will admit to taking a small swab with some isopropyl alcohol to an individual, particularly messy solder pad when I needed to re-shoot a picture after many component changes, especially when, after many resoldering, some flux escaped the pad itself and ran onto the PCB, but that's the extent of any flux removal. I moisten a Q-tipR or similar swab with alcohol, then place it on the flux and spin the tip to scrub that spot and loosen the flux. Ron AC7AC -Original Message- Hi Folks, I'd like to know from the collective wisdom what solvent may be used on Elecraft PC assemblies to remove some residual flux and flux smears. It seems to me that a solvent that wouldn't harm boards and components was isopropyl alcohol (rubbing alcohol) in the old days. What do you Elecraft Builders use! Thanks, Bill NA7Y * This communication, including any attachments, is confidential and may be protected by privilege. If you are not the intended recipient, any use, dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by telephone or email, and permanently delete all copies, electronic or other, you may have. To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice contained in this communication (including any attachments) was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein. The foregoing applies even if this notice is embedded in a message that is forwarded or attached. * ___ 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] N2CQ QRP Contest Calendar: Dec 14 - Jan14, 2006
~ N2CQ QRP CONTEST CALENDAR Dec 14 - Jan 14, 2006 ~ 80 METER FOXHUNT - EACH Wenesday 0200z to 0329z (Tue 9 PM to 10:29 PM EST) Info: http://www.qrpfoxhunt.org/ ~ 40 METER FOXHUNT - Each Friday 0200z to 0329z (Thurs 9 PM to 10:29 PM EST) Info: http://www.qrpfoxhunt.org/ ~ MDXA PSK-31 DeathMatch ... QRP Category Dec 16, z to Dec 17, 2400z Rules: http://www.mdxa1.org/deathmatch.html ~ Croatian CW Contest (CW) ... QRP Category Dec 16, 1400z to Dec 17, 1400z Rules: http://www.sk3bg.se/contest/9acwc.htm ~ QRP ARCI: Holiday Spirits Homebrew Sprint (CW) *** QRP Contest *** Dec 17, 2000z to 2359z Rules: http://www.qrparci.org ~ RUN FOR THE BACON (CW) *** QRP CONTEST *** EST: Dec 17, 9 PM to 11 PM UTC: Dec 18, 0200z 0400z Rules: http://fpqrp.com ~ R A E M Contest .. Low Power category Dec 24, 0200z to 0959z Rules: http://www.sk3bg.se/contest/raem.htm ~ RAC Canada Winter Contest (All) ... QRP Category Dec 30, z to 2359z Rules: http://www.rac.ca/downloads/canwin2006.pdf ~ Stew Perry (W1BB) Topband Distance Challenge (CW) ... QRP Category Dec 30, 1500z to Dec 31, 1500z ~ ARRL Straight Key Night Jan 1, z to 2400z Rules: http://www.arrl.org/contests/calendar.html?year=2007 ~ AGB NYSB New Year SnowBall Contest (80M-All)...QRP Category Jan 1, z to 0100z Rules: http://www.qsl.net/eu1eu/agb_nysb.htm ~ AGCW Happy New Year Contest (CW)...QRP Category Jan 1, 0900z to 1200z Rules: http://www.agcw.org/agcw-con/2006/Englisch/happynew_e.htm ~ AGCW VHF/UHF CW Contest ... QRP Category Jan 1, 1600z to 1900z (144 Mhz) Jan 1, 1900z to 2100z (432 Mhz) Rules: http://www.agcw.org/agcw-con/2006/Englisch/agcw-dl0_e.htm ~ ARRL RTTY Roundup ... = 150W Category Jan 6, 1800z to Jan 7, 2400z Rules: http://www.arrl.org/contests/calendar.html?year=2007 ~ EUCW 160 Meter Contest (CW) ... QRP Category Jan 6, 2000z to 2300z and Jan 7, 0400z to 0700z Rules: http://www.agcw.org/eucw/eu160.html ~ DARC 10-Meter Contest ... =100 W category Jan 8, 0900Z to 1059Z Rules: http://www.darc.de/referate/dx/xedczr.htm ~ Adventure Radio Society - Spartan Sprint (CW) ... QRP Contest! Jan 9, 0200z to 0400z (First Monday 9 PM EST) Rules: http://www.arsqrp.com/ ~ 070 Club PSKFEST Contest ... QRP Category Jan 13, z to 2400z Rules: http://www.podxs.com/html/pskfest.html ~ Michigan QRP Club Contest (CW) ... QRP Contest! Jan 13, 1200z to Jan 14, 2359z Rules: http://www.qsl.net/miqrpclub/contest.html ~ North American QSO Party (CW) (100w max. QRP Entries Noted) Jan 13, 1800z to Jan 14, 0600z Rules: http://www.ncjweb.com/naqprules.php ~ Thanks to SM3CER, WA7BNM, N0AX(ARRL) and others for assistance in compiling this calendar. Please foreward the contest info you sponsor to [EMAIL PROTECTED] and we will post it and give it more publicity. Anyone may use this N2CQ QRP Contest Calendar for your website, newsletter, e-mail list or other media as you choose. (Include a credit to the source of this material of course.) 72 de Ken Newman - N2CQ [EMAIL PROTECTED] http://www.amqrp.org/contesting/contesting.html http://www.n3epa.org/Pages/Contest/contest.htm ___ 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] Re: Solvent -- Better way
John Buck wrote: Perhaps my credibility is shot since I used to occasionally wash my hands with TCE. As a teenage ham in the mid-50's, we all cleaned stuff with carbon tetrachloride and just let it evaporate. Then I discovered MEK, which would dissolve the anti-fungal coating on old WW2 surplus parts if you kept putting enough on. I did it in my bedroom where my radios were. Later in the USAF, we had a big bucket of TCE in which the Model 15's and 28's were dunked. It was inside too. OSHA: If you're subscribed to this reflector, please don't have a cow. I sure wouldn't do any of that today. Apparently, I lucked out ... I'm still alive at the end of 2006 and the only behavior from my early adult years that affects me today (other than the fact that my wife is certain I'm crazy) involves combat. ALL: I would strongly (very strongly) recommend that the answer to the which solvent question for Elecraft equipment is NONE. Use *very* fine solder (mine is 0.015 63/37) which lets you precisely control the amount of solder, and thus flux, and will eliminate the need for cleaning anything. I also have a very small desk fan which I use to blow the fumes sideways and away from me while soldering, and I always wash my hands after building. 73 and my best of whatever season greeting works for you, Fred K6DGW Auburn CA CM98lw ___ 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] This old dog has a new trick(Ellecraft)
I'm 81 and have the shakes in both hands and I just finished K2 Ser. # 5745. It's on the air but with the shakes I have not been able to send CW for along time now. Maybe this will inspire me to get a keyboard. I am very impressed with the rig. ___ 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] Solvent
At 02:12 PM 12/14/2006, Howard W. Ashcraft wrote... For an example of what damage can be done, I am restoring a Tek SC504 oscilloscope where someone used contact cleaner/solvent on the channel 2 attenuator. Tek used special PC board material (polysulfone?) in the attenuators for many of their scopes. Most of the manuals specifically warn about using anything other than isopropyl alcohol for cleaning. From the 485 manual - Cleaning the switch contacts should only be done using isopropyl alcohol or a solution of 1% Joy detergent and 99% water. Do not use acetone, MEK, MIBK, benzol, toluol, carbon tetrachloride, trichlor, trichlene, methyl alcohol, methylene chloride, sulfuric acid, or Freon TC-TETF-22-TA-12. - they had a sense of humor, no battery acid cleaning allowed! ___ 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] KDSP2 questions
Don and Lyle, It's working! I removed the KDSP2 module and heated up a couple of dozen solder connections, especially at the connoectors. While I was at it I built the KNB2 module and installed it. I used the audio filter un-module from Rework Eliminators to replace the KDSP2 module while I checked out the KNB2. Then I reinstalled the KDSP2 and now have solid communications with it. Thanks to both of you for your assistance. 73, Chuck NI0C - Original Message - From: Don Wilhelm [EMAIL PROTECTED] To: Chuck Guenther [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Sent: Wednesday, December 13, 2006 9:11 PM Subject: RE: [Elecraft] KDSP2 questions Chuck, If you get the not inst message it means that the KDSP2 is not being recognized. The fact that it is intermittent indicates that there is a bad solder connection somewhere. You might try re-flowing the solder on the KDSP2 board. 73, Don W3FPR ___ 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] soldering - reliability long term
A colleague used to work for a tv manufacturer and they had a recurrent problem with tvs going sick after a few months. It was traced to solder joints not made correctly. Their soldering technique was satisfactory and the component manufacturers came over from Japan to investigate why the leads of the components were not always taking solder correctly. Turned out they had just fitted a new soap dispenser in the ladies' and filled it with soap containing lanolin. This makes hands nice and soft but transferred to component leads it prevents solder making proper contact. Before soldering, wash your hands with pure soap and do not use creams etc. On a similar theme, do not let silicone sprays or lubricants/grease anywhere near your shack/property/planet. That stuff should be banned. It stops anything sticking to anything and I don't know of a solvent. David G3UNA ___ 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
