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Total 8 documents matching your query.

1. [RFI] Strong RFI on 2m (score: 1): Author: <nlsa@nlsa.com>; Date: Wed, 22 Dec 2021 09:50:23 -0500; Dear friends, I have recently commissioned my 4-yagi 2m EME system. To my unhappy surprise, I find strong RFI in the direction of a large commercial broadcast tower 3.5 miles away. The noise is unifo; /archives//html/RFI/2021-12/msg00081.html (7,311 bytes)
2. Re: [RFI] Strong RFI on 2m (score: 1): Author: Greg Troxel <gdt@lexort.com>; Date: Wed, 22 Dec 2021 10:53:02 -0500; Did you put in e.g. a 10 dB pad and verify that the noise drops (only) 10 dB? Given what you said, I would not expect otherwise, but a good test to do. Have you tried to look over much wider bandwidt; /archives//html/RFI/2021-12/msg00082.html (6,547 bytes)
3. Re: [RFI] Strong RFI on 2m (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 22 Dec 2021 18:48:07 +0000; I suspect what you are experiencing is broadband noise from solid state transmitter PAs. During the days of vacuum tube amplifiers for commercial broadcast this was much less of a problem. However, t; /archives//html/RFI/2021-12/msg00084.html (9,059 bytes)
4. Re: [RFI] Strong RFI on 2m (score: 1): Author: "Lloyd - N9LB" <lloydberg@tds.net>; Date: Wed, 22 Dec 2021 13:33:21 -0600; We had a full-power 50 KW Channel 3 VHF TV station here in Madison WI since the 1950s. The transmitter was an all-tube RCA TT-50, worked well, reliable, and spectrally very clean. Then about 30 years; /archives//html/RFI/2021-12/msg00086.html (10,829 bytes)
5. Re: [RFI] Strong RFI on 2m (score: 1): Author: <nlsa@nlsa.com>; Date: Wed, 22 Dec 2021 16:27:48 -0500; Dear Lloyd & others, I appreciate the several replies on and off-list. After building my EME system from scratch over the past seven years, I would prefer that the noise problem be something I can so; /archives//html/RFI/2021-12/msg00090.html (12,627 bytes)
6. Re: [RFI] Strong RFI on 2m (score: 1): Author: <nlsa@nlsa.com>; Date: Wed, 22 Dec 2021 16:46:06 -0500; My question should be, "What does Ethernet EMI look like at VHF?" It might be different at HF. W9IP Dear Lloyd & others, I appreciate the several replies on and off-list. After building my EME system; /archives//html/RFI/2021-12/msg00091.html (14,101 bytes)
7. Re: [RFI] Strong RFI on 2m (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 22 Dec 2021 22:16:45 +0000; Ethernet noise is not totally broadband in nature. There are pockets of high BB emissions, pockets of very little noise with frequency, and then more pockets of noise as you tune around. All changes; /archives//html/RFI/2021-12/msg00093.html (14,989 bytes)
8. Re: [RFI] Strong RFI on 2m (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 22 Dec 2021 14:29:06 -0800; YES! The first step in ANY investigation of noise should be with the widest practical waterfall display at frequencies of interest. http://k9yc.com/KillingReceiveNoise.pdf At HF, wired Ethernet is ra; /archives//html/RFI/2021-12/msg00095.html (9,193 bytes)

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