Re: [Elecraft] My new KPA500
Joe (K2UF) is lucky with: UPS says my new KPA500 is now in Illinois and due to be delivered on Monday I opted for the lower cost USPS delivery. The handling of USPS deliveries in the UK is by Parcel Force, often referred to as Parcel Farce. They are living up to their name, my KPA500 has been sitting in UK customs for a week with no sign of movement and Parcel Farce claim there is nothing they can do to speed things up and it's nothing to do with them (customs say it is, according to their web site)! UPS clear UK customs in a matter of minutes and can have an Elecraft parcel to a UK address in 2 ~ 3 days. Dave, G4AON __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Prosign IM to end K3 RTTY idle not working: Solved
All I can say in my defense is that the 1977 ARRL Handbook put a bar over AR, AS, KN, and SK. I guess things have changed since that time. 73, Don W3FPR On 12/3/2011 2:44 AM, David Pratt wrote: Forgive me for making a slight correction to that, Don, but KN is not a prosign but is defined as a left-hand bracket in the latest recommendations of the ITU. The latest definitions were prepared primarily to include the Morse code sequence for @ (prosign AC). http://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.1677-1-200910-I!!PDF-E.pdf Consequently, K N should really be separated by a space. 73 de David G4DMP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 Buzz SOLVED
My KPA500 #274 worked fine with the yellow wire installed, but the voltage was a bit low (56-year old house) and output on 6M was also a tad low. I wired it for 220v. Since I use it for meteor scatter on 6m, I really wanted full output. But when I switched to the red wire, I got a terrible buzz. I don't mean a slight buzz, I mean a buzz on the order of an arc welder running at full tilt. A buzz that was louder than when the pole pig across the street caught fire. A buzz far too loud to be tolerated in a nice, quiet, Elecraft-equipped shack. I tried repositioning the transformer a number of times to no avail. I finally contacted Gary at Elecraft support, and working with him got the problem solved. Here's what I did: 1) Replaced the transformer hold-down bolt that was threaded only at the top with a bolt that was threaded all the way down. I installed this according to the new procedure in the KPA500 assembly manual (this is now shipped with all KPA500s). 2) I zip-tied together a number of the wires so that they were not contacting the transformer or the top of the case any more than was necessary. 3) I used a torque wrench to install the transformer to the correct spec in the manual. I'm not sure what fixed it, but the buzz is now down to a very slight, almost unnoticeable level. I have silent QRO on CW. Luxury. I offer this for anyone with an early KPA500 with a loud buzzing problem. When this thread was active there seemed to be some confusion about what was a normal buzzing level. Wayne stated that some buzz was normal, but I am sure that others experienced this extremely loud buzz that is not normal. I never saw a resolution of this thread, so if I missed it my apologies. 73, Eric WD6DBM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Prosign IM to end K3 RTTY idle not working: Solved
Well, we have a slight conflict Houston! I found the ARRL Operating Manual - 9th Edition, and it has the same list as my 1977 Handbook, So if we want to invite only the named station to transmit, we should send a left-hand parenthesis symbol - Yes, the same operating manual lists that too! Interesting. 73, Don W3FPR On 12/3/2011 6:37 AM, Don Wilhelm wrote: All I can say in my defense is that the 1977 ARRL Handbook put a bar over AR, AS, KN, and SK. I guess things have changed since that time. 73, Don W3FPR On 12/3/2011 2:44 AM, David Pratt wrote: Forgive me for making a slight correction to that, Don, but KN is not a prosign but is defined as a left-hand bracket in the latest recommendations of the ITU. The latest definitions were prepared primarily to include the Morse code sequence for @ (prosign AC). http://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.1677-1-200910-I!!PDF-E.pdf Consequently, K N should really be separated by a space. 73 de David G4DMP __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] My new KPA500
Do they charge for storage? ;-) 73, Rick Dettinger, K7MW They are living up to their name, my KPA500 has been sitting in UK customs for a week with no sign of movement and Parcel Farce claim there is nothing they can do to speed things up and it's nothing to do with them (customs say it is, according to their web site)! Dave, G4AON __ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA-500
Finally i received my KPA-500 amp kit s/n 564,it took 10 days to arrive in Tn.The build when straight forward and it worked without any problems.I have powered it with 240 and 120 volts no differance in power out.The Brown truck must of gotten lost in the mountains.Good luck to all the KPA-500 owners,its a winner. 73s Norm kg9d K-3 #1204 KPA -500 #564 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 Buzz SOLVED
Hello Eric, All these have already been covered in the latest manual with new mounting hardware for the transformer. I did the same as you and the problem solved. TNX 73, Johnny VR2XMC 從︰ eric norris gliderboy1...@yahoo.com 收件人︰ elecraft@mailman.qth.net elecraft@mailman.qth.net 傳送日期︰ 2011年12月3日 (週六) 8:00 PM 主題︰ [Elecraft] KPA500 Buzz SOLVED My KPA500 #274 worked fine with the yellow wire installed, but the voltage was a bit low (56-year old house) and output on 6M was also a tad low. I wired it for 220v. Since I use it for meteor scatter on 6m, I really wanted full output. But when I switched to the red wire, I got a terrible buzz. I don't mean a slight buzz, I mean a buzz on the order of an arc welder running at full tilt. A buzz that was louder than when the pole pig across the street caught fire. A buzz far too loud to be tolerated in a nice, quiet, Elecraft-equipped shack. I tried repositioning the transformer a number of times to no avail. I finally contacted Gary at Elecraft support, and working with him got the problem solved. Here's what I did: 1) Replaced the transformer hold-down bolt that was threaded only at the top with a bolt that was threaded all the way down. I installed this according to the new procedure in the KPA500 assembly manual (this is now shipped with all KPA500s). 2) I zip-tied together a number of the wires so that they were not contacting the transformer or the top of the case any more than was necessary. 3) I used a torque wrench to install the transformer to the correct spec in the manual. I'm not sure what fixed it, but the buzz is now down to a very slight, almost unnoticeable level. I have silent QRO on CW. Luxury. I offer this for anyone with an early KPA500 with a loud buzzing problem. When this thread was active there seemed to be some confusion about what was a normal buzzing level. Wayne stated that some buzz was normal, but I am sure that others experienced this extremely loud buzz that is not normal. I never saw a resolution of this thread, so if I missed it my apologies. 73, Eric WD6DBM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 Buzz SOLVED
I had a loud fan in my KPA500. I contacted Gary and he had them send me a new fan and all was well. Merry Christmas to all of the folks at Elecraft. Excellent customer service all the way around! 73, Tom Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member If somebody has a bad heart, they can plug this jack in at night as they go to bed and it will monitor their heart throughout the night. And the next morning, when they wake up dead, there'll be a record. --Mark S. Fowler, FCC Chairman On Sat, 3 Dec 2011 04:00:04 -0800 (PST), eric norris gliderboy1...@yahoo.com wrote: My KPA500 #274 worked fine with the yellow wire installed, but the voltage was a bit low (56-year old house) and output on 6M was also a tad low. I wired it for 220v. Since I use it for meteor scatter on 6m, I really wanted full output. But when I switched to the red wire, I got a terrible buzz. I don't mean a slight buzz, I mean a buzz on the order of an arc welder running at full tilt. A buzz that was louder than when the pole pig across the street caught fire. A buzz far too loud to be tolerated in a nice, quiet, Elecraft-equipped shack. [snip] __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Prosign IM to end K3 RTTY idle not working: Solved
I believe -.--. has always been a left-hand parenthesis. Since Hams didn't use parenthesis in CW communications, it didn't produce a conflict. (For me, the toughest part of passing the commercial RadioTelegaph license test back in the 1950's was learning to copy all the punctuation marks Hams never use mixed into 5-letter groups at 20 WPM.) I enjoy the new @ character. Now I can get sloppy and sign my call @7@ Ron AC7AC -Original Message- In a recent message, Don Wilhelm w3...@embarqmail.com writes You send the AS prosign as didahdididit, KN as dahdidahdahdit, etc. Forgive me for making a slight correction to that, Don, but KN is not a prosign but is defined as a left-hand bracket in the latest recommendations of the ITU. The latest definitions were prepared primarily to include the Morse code sequence for @ (prosign AC). http://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.1677-1-200910-I!!PDF-E.pdf Consequently, K N should really be separated by a space. 73 de David G4DMP -- + - - - - - - - - - - - - - - - - + | David M Pratt, Kippax, Leeds. | | Website: http://www.g4dmp.co.uk | + - - - - - - - - - - - - - - - - + __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 and MFJ-1025/1026 unit
I was wondering if anyone out in the K3 world is using a mfj-1025 or 1026 to null out power line noise? I don't quite understand what the difference is between the 1025 versus the 1026 other then the antenna that is supplied with the unit. Plus there seems to be enhanced instructions with the 1026 versus the 1025. I do see the the unit must be hooked up between the radio and the amplifier. If you hook it up after the amplifier you can say bye bye to the unit. Any help would be much appreciated. Mark KB3Z __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 TX Inhibit success
Further to my mail yesterday, I am now able to confirm that my system is running with TX INHibit in use. Primary control between RX and TX is achieved with a footswitch controlling my sequencer. That in turn controls TX INHibit. So, unless I hit the footswitch, the K3 will not produce any power from PTT, VOX, XMIT, TUNE or internal voice keyer. It is, I think, as near foolproof as possible, which is just what I wanted ! It'll get a good test tomorrow, we have an 8 hour 2m contest on Sunday. CUL John G4ZTR __ Information from ESET NOD32 Antivirus, version of virus signature database 6680 (20111203) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Ferrite freq response
On 12/1/2011 7:54 AM, Mike Markowski wrote: The Small-Signal Frequency Response of Ferrites, that might be of interest to those who took part in the ferrite thread. It can be found online at http://highfrequencyelectronics.com/ I skimmed this piece, which hides behind a lot of math, and to a certain extent, failing to see the forest for the trees. I've done considerable research on ferrites, including a lot of measurements. It's presented as part of my RFI tutorial. http://audiosystemsgroup.com/RFI-Ham.pdf I also looked at the author's list of references, which fails to list my 2005 AES paper on the topic, nor the RFI tutorial, which has had close to a million downloads since I first published it around 2007. 73, Jim Brown K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Prosign IM to end K3 RTTY idle not working: Solved
Hmmm ... I had punctuation on my 2nd Telegraph exam in 1956 and got credit for the code when I sat for the Extra that afternoon at the Los Angeles FCC office. I didn't know the Extra code did not include punctuation. All the mills at the coastal marine station I worked at had a slashed zero, and a 1 key [not present on regular typewriters, you used a lower-case L]. They also had a couple of prosigns on them, I remember BT and AR. We had five mills, four of which were open-frame Underwoods. The prosigns had no bar. I can't remember the make of the fifth one, never really used it, but the prosigns on it had a bar. I have a 1990 ARRL Handbook, and on pg 38-2, Table 2 lists four prosigns and a couple of other signals. AR, KN, AS, and SK all have a bar. K, R, and CL do not, not that this means anything. The operating description for AR is interesting: Used after a call to a specific station before the contact has been established. I wonder where they got that? 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 12/3/2011 8:05 AM, Ron D'Eau Claire wrote: I believe -.--. has always been a left-hand parenthesis. That's what I learned. Since Hams didn't use parenthesis in CW communications, it didn't produce a conflict. (For me, the toughest part of passing the commercial RadioTelegaph license test back in the 1950's was learning to copy all the punctuation marks Hams never use mixed into 5-letter groups at 20 WPM.) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA-500 - 40 PIN I/O RIBBON CABLE CONNECTOR
Hello everyone, I was just about ready to assemble the front panel, when I realized the connector on the 40 pin cable has one position blocked. If one follows the assembly manual instructions (the red cable to P1...) you cannot plug in the cable because the blockage is on the wrong side. I would very much appreciate your help. 73 and thank you Manuel LU5OM CT4IK KPA-500 # 562 -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-500-40-PIN-I-O-RIBBON-CABLE-CONNECTOR-tp7058604p7058604.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 TX Inhibit success
Appears John G4ZTR has solved the control issue with K3 Inhibit. I am using Inhibit on 2m and higher with my K3 and thought I would share how I did it using a sequencer. BTW the K3 will not transmit RF unless the Inhibit line is keyed by my sequencer even if I use the XMIT button in TUNE (this is as it should be so accidental RF is not transmitted). When my sequencer is powered off the K3 cannot be keyed on 2m, but will function on other bands. I accomplished this by using the BAND0 control line to enable Inhibit only on 2m (which uses TRN1 for my station). TRN1 outputs +5v on BAND0 which I use for driving a relay to enable INHIBIT. See my webpage: http://www.kl7uw.com/TX-INHIBIT.htm Disregard references to the FT-847 inhibit. 73, Ed - KL7UW, WD2XSH/45 == BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep dubus...@gmail.com == __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA-500 - 40 PIN I/O RIBBON CABLE CONNECTOR
I experienced a similar problem with my KPA500 ribbon cable. After an unsuccessful attempt to remove the plugs, I contacted Elecraft Technical Support and the correct ribbon cable was shipped to me. Daniel W0OTV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA-500 - 40 PIN I/O RIBBON CABLE CONNECTOR
Manuel, With ribbon cables, that condition can mean that you have the two ends swapped. It also can mean that you have a cable with the plug in the wrong hole. 73, Don W3FPR On 12/3/2011 2:47 PM, manueldeportugal wrote: Hello everyone, I was just about ready to assemble the front panel, when I realized the connector on the 40 pin cable has one position blocked. If one follows the assembly manual instructions (the red cable to P1...) you cannot plug in the cable because the blockage is on the wrong side. I would very much appreciate your help. 73 and thank you Manuel LU5OM CT4IK KPA-500 # 562 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Elecraft SSB net announcement
The weekly Elecraft SSB net will meet tomorrow (12/4/11) at 1800Z on 14.3035 MHz +/- QRM. I will not be able to be net control this week, so John, WO1S, will take over from his southern California QTH. Have a great net. I'll see you next week. 73, Phil, NS7P __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Issue with K3 EZ and SWR scan running LP Bridge
Some programs have trouble running through a virtual serial port program such as VSPE or LP Bridge. K3 EZ might be one of them. At one point the K3 utility had that problem. I'm not sure if that is still the case now. 73, John N1JM -- View this message in context: http://elecraft.365791.n2.nabble.com/Issue-with-K3-EZ-and-SWR-scan-running-LP-Bridge-tp7054698p7058877.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Odd TX Behavior
First, thanks for all the logging suggestions. I have not yet decided which route I will take, but at least I have some suggestions. As to the subject matter, I have an odd transmit behavior. I like operating JT65 using JT65-HF and letting HRD key the radio. Sometimes, not always but enough times to be frustrating, when finishing with a transmit cycle the radio seems to hang in transmit. No audio is going out and there is no output power, but the radio is not receiving. I am using the SignaLink USB but prior to that, the EMU-0204 did the same thing, so I am fairly certain it is not a sound card issue. This problem does not seem to occur when transmitting PSK31 or Olivia using FLDigi. I'm thinking it's either a JT65-HF or HRD issue, but I cannot find anything regarding such a problem in either Elecraft list. Thanks, Joel - W4JBB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA 500: Does yours need time to warm up?
Well after a couple of days of making sure the ALC is 5-7 bars, I still have significant power creep especially on 12 meters. I can take several CQ sequences before the power gets to the rated value. Are there any other ideas? -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-500-Does-yours-need-time-to-warm-up-tp6967951p7059232.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Elecraft CW Net Announcement
Good Evening, Wonderful early winter weather all week has allowed me to stay outside much of each day. All this sun is unusual so it is very special. But as I work I look down into the valleys and find they are filled with dense fog. That may explain why so few people drove by over the week. After cutting, splitting, hauling, and stacking wood for so long it feels natural to keep doing it. As long as there is room I don't mind ending the heating season with wood to spare. Besides it is good exercise in the fresh, frosty air. Propagation was just as good with twenty meters waking up an hour or so after sunrise. I did not get a chance to listen on ten meters this week due to the fine weather keeping me away from a rig. But I am sure that soon the rains will be back and I'll be at the desk full time in the not too distant future. Then the good propagation will be a boon to keeping me from going cabin crazy. However, if the snow gets too deep I can always go XC skiing :) My ATS 3 can make contacts from an impromptu snow cave too. Please join us tomorrow afternoon and evening. 1) Hail signs (first letter or two of the suffix of your call) 2) NCS help (as well as QSP/QNP relay help) Monday 0100z (Sunday 5 PM PST) 7045 kHz Stay well, Kevin. KD5ONS - __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2/100: Do I have a ground loop??
Hi Group, Any advice appreciated about this strange issue affecting my K2/100? -: I recently started using my K2/100 with an external speaker. It is an unamplified, 4ohm speaker in an enclosure. I've noticed that on SSB, voice peaks cause some breakthrough of distorted audio on the external speaker. It's unobtrusive, but I notice it. It also occurs when I Tx into a dummy load and is at the same level as when I Tx into my antenna - ie it doesn't change. Now here's the strange thing: it's only present in the audio from the rear external speaker jack. If I plug headphones into the front panel headphone jack, there is no breakthrough heard on that audio signal. If I plug a set of headphones or a different speaker into the rear panel external speaker jack, I do hear the distorted audio signal on Tx in that audio path. My shack is clean with respect to common mode currents - I've checked every cable with my clip on meter. I suspect this is some kind of ground loop. Could it be occuring internal to the K2/100, somehow producing distortion in the external speaker audio pathway, but not the front panel headphone audio path?? That bit, I don't understand. Any ideas? Thanks as always! John VK7JB -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-100-Do-I-have-a-ground-loop-tp7059531p7059531.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
