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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Curious\s+local\s+QRM\s*$/: 7 ]

Total 7 documents matching your query.

1. LF: Curious local QRM (score: 1): Author: "James Moritz" <[email protected]>; Date: Tue, 6 Sep 2011 20:48:22 +0100; Dear LF Group, While doing some tests with 136kHz ferrite rod antennas recently, I had noticed a problem with some local wideband "mush" QRM. In some locations in my garden this was 30dB or more over; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00004.html (11,369 bytes)
2. Re: LF: Curious local QRM (score: 1): Author: "Graham" <[email protected]>; Date: Tue, 6 Sep 2011 23:29:51 +0100; Andy might have a comment about sheds and foil ? Fascinating Jim. Memories of rusty bolts! But possibly a case of parametric amplification/oscillation? Foil lining for the shed? John GM4SLV; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00206.html (9,891 bytes)
3. Re: LF: Curious local QRM (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Tue, 6 Sep 2011 21:07:09 +0100; I used one of my small loop antennas with a long coax extension lead going back to the shack, and a pair of wireless headphones so that I could listen to the QRM level on the RX in the shack as I mo; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00266.html (11,632 bytes)
4. Re: LF: Curious local QRM (score: 1): Author: John P-G <[email protected]>; Date: Tue, 6 Sep 2011 21:51:05 +0000 (GMT Standard Time); But possibly a case of parametric amplification/oscillation? Foil lining for the shed? John GM4SLV; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00288.html (9,260 bytes)
5. Re: LF: Curious local QRM (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Tue, 06 Sep 2011 23:35:40 +0200; Hi Jim, Really a good story! I can imagine you walking arround with the headphones and throwing all the things out of the shed ;-) So we can see, not only SMPSs and plasma TVs can be sources of QRM,; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00307.html (11,587 bytes)
6. Re: LF: Curious local QRM (score: 1): Author: John P-G <[email protected]>; Date: Tue, 6 Sep 2011 20:14:47 +0000 (GMT Standard Time); Walking round the antenna field at a BBC HF station hearing World Serviice emanating from rusty fences. Oh happy days! John GM4SLV; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00558.html (9,260 bytes)
7. Re: LF: Curious local QRM (score: 1): Author: Scott Tilley <[email protected]>; Date: Tue, 06 Sep 2011 14:51:00 -0700; Hi Jim I had a similar experience on my 136 RX system after installing the VLF antenna and preamp... The solution for me was installing an audio unbalanced to balanced isolation transformer on the fe; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-09/msg00690.html (11,207 bytes)

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