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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+Sources\s+of\s+wideband\s+hiss\s*$/: 12 ]

Total 12 documents matching your query.

1. [RFI] Sources of wideband hiss (score: 1)
Author: <nlsa@nlsa.com>
Date: Sat, 23 Dec 2023 14:09:53 -0500
Dear friends, What are some sources of wideband hiss? I'm talking about an unstructured, apparently unmodulated many-dB increase in the noise floor across the 2m band* No associated birdies or other
/archives//html/RFI/2023-12/msg00002.html (7,326 bytes)

2. Re: [RFI] Sources of wideband hiss (score: 1)
Author: Frank W3LPL <donovanf@starpower.net>
Date: Sat, 23 Dec 2023 14:19:58 -0500 (EST)
Like all other RFI, the first steps are 1. turn off all AC power in your own home and turn off all UPSes. If the noise disappears, you can use your circuit breakers as a next step in isolating the RF
/archives//html/RFI/2023-12/msg00003.html (8,082 bytes)

3. Re: [RFI] Sources of wideband hiss (score: 1)
Author: AA5CT via RFI <rfi@contesting.com>
Date: Sat, 23 Dec 2023 22:51:01 +0000 (UTC)
Q: What mode are you using to note 'hiss'? Can I ask whey you hear in AM mode, IOW, 'envelope detection' mode (vs say, SSB)? de AA5CT Jim What are some sources of wideband hiss?  I'm talking about an
/archives//html/RFI/2023-12/msg00011.html (7,934 bytes)

4. Re: [RFI] Sources of wideband hiss (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Sat, 23 Dec 2023 23:48:24 +0000
The "hiss" should be demodulated best in AM mode with a wide bandwidth. Does it contain any component of grid power? If so, that would be a strong indication of bad power distribution. If not, dig de
/archives//html/RFI/2023-12/msg00012.html (9,843 bytes)

5. Re: [RFI] Sources of wideband hiss (score: 1)
Author: Gary NA6O via RFI <rfi@contesting.com>
Date: Sat, 23 Dec 2023 17:08:14 -0800
At the W6TCP hilltop EME site, this exact problem occurs on 2m and also on 220 MHz whenever the array is level and pointed towards one of the nearby towns. There is NO character or modulation detecti
/archives//html/RFI/2023-12/msg00014.html (8,469 bytes)

6. Re: [RFI] Sources of wideband hiss (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sat, 23 Dec 2023 18:30:40 -0800
That cavity in front of the first gain stage strongly suggests IMD in the RX system. I was part of a team that maintained VHF and UHF repeaters in Chicago for our club, where ALL TV and nearly all FM
/archives//html/RFI/2023-12/msg00015.html (10,550 bytes)

7. Re: [RFI] Sources of wideband hiss (score: 1)
Author: "Dave (NK7Z)" <dave@nk7z.net>
Date: Sat, 23 Dec 2023 18:41:17 -0800
See: https://www.nk7z.net/i-have-rfi-now-what-locating-it/ 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Te
/archives//html/RFI/2023-12/msg00016.html (9,744 bytes)

8. Re: [RFI] Sources of wideband hiss (score: 1)
Author: <nlsa@nlsa.com>
Date: Sat, 23 Dec 2023 21:46:46 -0500
Dear Jim Its just a general rise in the noise floor, as if you turned the audio volume up. It sounds like noise; perhaps hiss is not the best word to use. Michael Q: What mode are you using to note '
/archives//html/RFI/2023-12/msg00018.html (9,090 bytes)

9. Re: [RFI] Sources of wideband hiss (score: 1)
Author: <nlsa@nlsa.com>
Date: Sat, 23 Dec 2023 21:57:42 -0500
Gary - My RF environment is definitely a challenge. Several multi-kW FM radio stations and three TV stations within 5-6 km line-of-sight. I implemented a sharp OCI helical filter <https://www.ocicom.
/archives//html/RFI/2023-12/msg00019.html (10,078 bytes)

10. Re: [RFI] Sources of wideband hiss (score: 1)
Author: <nlsa@nlsa.com>
Date: Sat, 23 Dec 2023 21:59:00 -0500
Dear Frank, I have already taken both of these fundamental steps. I know the direction from which the noise is coming; my question to the list was, " What are some sources of wideband hiss?" What is
/archives//html/RFI/2023-12/msg00020.html (10,010 bytes)

11. Re: [RFI] Sources of wideband hiss (score: 1)
Author: Frank W3LPL <donovanf@starpower.net>
Date: Sat, 23 Dec 2023 22:43:24 -0500 (EST)
Michael, Its not adequate to determine the direction of the RFI, that phase of investigation is not complete until you determine the location of the RFI source. A small 2 meter antenna and hand porta
/archives//html/RFI/2023-12/msg00021.html (10,221 bytes)

12. Re: [RFI] Sources of wideband hiss (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Sun, 24 Dec 2023 18:16:35 +0000
And remember the nulls off the side of the array are deeper and far better defined than the forward peak lobe. Dave - W ØLEV -- *Dave - WØLEV* _______________________________________________ RFI mail
/archives//html/RFI/2023-12/msg00023.html (11,920 bytes)

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