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Total 5 documents matching your query.

1. [RFI] Common mode noise (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Wed, 29 Feb 2012 11:58:05 -0500; I just built a bias-tee to inject 12 volts into my receive antenna feedline for a relay box and preamp at the far end. I used what I think is a standard design, with a series 1 mH RF choke and an 0.1; /archives//html/RFI/2012-02/msg00040.html (7,364 bytes)
2. Re: [RFI] Common mode noise (score: 1): Author: "Dale Svetanoff" <svetanoff@earthlink.net>; Date: Wed, 29 Feb 2012 15:36:20 -0600; Pete, Very interesting, but one big question: You say that the Radio Shack wall wart is regulated. OK, is it linear or switcher? One way to tell without cutting or sawing it open is to look at the po; /archives//html/RFI/2012-02/msg00046.html (10,090 bytes)
3. Re: [RFI] Common mode noise (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Wed, 29 Feb 2012 16:50:39 -0500; It is definitely a switcher, Dale. I didn't know for sure, but kinda figured that was how they achieved the wide input voltage range on these things. That, plus the weight hi. 73, Pete N4ZR The World; /archives//html/RFI/2012-02/msg00048.html (10,359 bytes)
4. Re: [RFI] Common mode noise (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 29 Feb 2012 15:12:31 -0800; Yes, indeed. In addition to Dale's comments, I would reinforce the fact that a very high percentage of RF noise appears as a common mode signal on interconnecting cables, and that the addition of a g; /archives//html/RFI/2012-02/msg00050.html (7,400 bytes)
5. Re: [RFI] Common mode noise (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Thu, 01 Mar 2012 06:30:12 -0500; In the meantime, I realized that I have a 3 amp 12v linear supply sitting almost unused in the shack. That's better on a couple of counts. 73, Pete N4ZR The World Contest Station Database, updated da; /archives//html/RFI/2012-03/msg00000.html (7,120 bytes)

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