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Total 28 documents matching your query.

1. [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Tue, 13 Jan 2009 23:09:00 -0500; Though not a RFI issue, perhaps someone has the solution? When I connect my Bose QC2 noise cancelling headphones to my K3 I get a hum which is only heard in the right headphone. It sounds like a 60 c; /archives//html/RFI/2009-01/msg00093.html (8,099 bytes)
2. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "WA3GIN" <wa3gin@comcast.net>; Date: Tue, 13 Jan 2009 23:12:50 -0500; Perhaps the radio is a mono output and the headphones are stereo...when used with a mono jack you may be shorting one side to a ground loop... try getting a mono to stereo converter jack. 73, dave wa; /archives//html/RFI/2009-01/msg00094.html (9,116 bytes)
3. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Tim Duffy K3LR" <k3lr@k3lr.com>; Date: Tue, 13 Jan 2009 22:19:46 -0600; Hi Gary! This is really a strange problem. Maybe there is a wiring issue as WA3GIN points out. We use QC-2 headphones at K3LR. They work really well. The operators love them. I've never heard of anyo; /archives//html/RFI/2009-01/msg00095.html (9,164 bytes)
4. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 13 Jan 2009 20:21:09 -0800; If what you hear is HUM (pure 60 Hz) rather than BUZZ (little or no 60 Hz, but lots of 180, 360, 420, etc.) suspect a magnetic field coupling problem. If what you hear is BUZZ, suspect power-related; /archives//html/RFI/2009-01/msg00096.html (7,398 bytes)
5. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 00:16:58 -0500; Hi Dave, No, these are stereo jacks, the K3 is a dual receiver radio with identical receivers which are a true diversity ensemble with one receiver using one antenna and the other receiver using a di; /archives//html/RFI/2009-01/msg00097.html (11,474 bytes)
6. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 00:16:58 -0500; Hi Tim, I've googled to try to find an answer and found this page: http://www.fixya.com/support/t932364-humming_sound_in_left_earpiece but the sound here is in the other earpiece. It's a real PITA as; /archives//html/RFI/2009-01/msg00098.html (11,488 bytes)
7. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 00:29:28 -0500; Jim, Definitely a hum as opposed to a buzz. As I sit this moment with them on, the hum is on the right. Turning off the AStron Linear supply to the K3 & bench does nothing to attenuate the hum. Turni; /archives//html/RFI/2009-01/msg00099.html (10,404 bytes)
8. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "WA3GIN" <wa3gin@comcast.net>; Date: Wed, 14 Jan 2009 00:34:25 -0500; Yes, A couple of decades ago I had the same set up almost with an FT1000. The FT power supply didn't like the the fact that I using a DSP599 with a difference power supply...different issue but simil; /archives//html/RFI/2009-01/msg00100.html (12,785 bytes)
9. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: Tree <tree@kkn.net>; Date: Tue, 13 Jan 2009 21:35:38 -0800; It could be a problem with the headphones as well. I had a pair of sony noise cancelling ones that developed this same problem. If you ground yourself - it probably reduces the amount of AC your body; /archives//html/RFI/2009-01/msg00101.html (9,102 bytes)
10. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 13 Jan 2009 21:54:11 -0800; You may have a magnetic field problem due to wiring errors in your AC power distro. There must be ONE, BUT ONLY ONE, bond between neutral and ground in any power system, and that bond must be at the; /archives//html/RFI/2009-01/msg00102.html (8,577 bytes)
11. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 00:54:28 -0500; Dave, Radio shack used to sell small isolating transformers and I thought about trying that earlier. That might be a good work-around. Odd it's only the one headphone and notshowing up on both sides.; /archives//html/RFI/2009-01/msg00103.html (13,660 bytes)
12. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 09:32:16 -0500; Hi Kirk, Indeed they are all the way in on both ends & that pesky hum remains. While assuring they are seated well I tried something, which was to have the headphones on and the stereo plug unplugge; /archives//html/RFI/2009-01/msg00104.html (9,410 bytes)
13. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 09:32:16 -0500; hi Jack, Tried that with no change. It's got me tugging what hair is left. Gary KA1J _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/m; /archives//html/RFI/2009-01/msg00105.html (8,592 bytes)
14. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Wed, 14 Jan 2009 08:42:38 -0800; Are those Bose headphones *really* worth that kind of money? Have seen their ads, just curious if they are that much better in service on a HF rig than other brands. 73, Gary...wa6fgi Hi Kirk, Indee; /archives//html/RFI/2009-01/msg00106.html (9,897 bytes)
15. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "David Jordan" <wa3gin@comcast.net>; Date: Wed, 14 Jan 2009 12:31:55 -0500; I love mine...we operate field day from a bus with a 20kw generator and several overhead AC units...can't hear any of it with the head phones turned on...comfortable too. Enjoy, Dave Wa3gin p.s. pics; /archives//html/RFI/2009-01/msg00107.html (11,295 bytes)
16. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Tim Duffy K3LR" <k3lr@k3lr.com>; Date: Wed, 14 Jan 2009 11:42:59 -0600; This is how we adapted the Heil mic to the QC-1 and QC-2. The same procedure works on both models. http://www.freewebs.com/k1dg/boseheadphonemod.htm The Bose phones are really worth it. They are the; /archives//html/RFI/2009-01/msg00108.html (12,202 bytes)
17. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: WX5L <wx5l@charter.net>; Date: Wed, 14 Jan 2009 13:52:07 -0500; Gary, At this point you need to check that the ground(s) in the headphone jack are still secure to the chassis of the rig. It seems that the result of a poor ground from the jack to the chassis could; /archives//html/RFI/2009-01/msg00109.html (11,204 bytes)
18. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "David Jordan" <wa3gin@comcast.net>; Date: Wed, 14 Jan 2009 13:59:28 -0500; If the headsphones have a ground problem the issue might be reproducible on another piece of equipment (PC, stereo, walkman, etc.). 73, Dave Wa3gin Gary, At this point you need to check that the grou; /archives//html/RFI/2009-01/msg00110.html (12,082 bytes)
19. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "Gary Smith" <Gary@doctorgary.net>; Date: Wed, 14 Jan 2009 16:22:25 -0500; This is most interesting (& it would be more interesting yet if the hum were not an irritation). The cord to the headset seems to be likely involved, at least that's what I'm leaning towards. If I h; /archives//html/RFI/2009-01/msg00111.html (11,044 bytes)
20. Re: [RFI] Hum in Bose QC2 headphones (score: 1): Author: "David Jordan" <wa3gin@comcast.net>; Date: Wed, 14 Jan 2009 16:56:41 -0500; What fun...take a close look at the jack. Some are steel with chrome coating...the two metals start to react and a resistance between the chrome and the steel develops increasing the impedance...not; /archives//html/RFI/2009-01/msg00112.html (12,090 bytes)

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