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Total 9 documents matching your query.

1. [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Thu, 19 May 2016 08:02:19 -0700; June QST has a review of the MFJ 5008 ultrasonic receiver. I am thinking about getting one for locating sources of power line noise. What do you think of this unit ? Bob K6UJ ________________________; /archives//html/RFI/2016-05/msg00068.html (8,178 bytes)
2. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Thu, 19 May 2016 08:08:02 -0700; Hello Bob, I have not used the MFJ unit, so I am unable to comment on it. I have used the older version from Xtal set Society, (in my review), and was happy with it. The newer Xtal Set Society vers; /archives//html/RFI/2016-05/msg00069.html (9,243 bytes)
3. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: "Frank N. Haas KB4T" <utility.rfi.pro@gmail.com>; Date: Thu, 19 May 2016 12:19:27 -0400; The percentage of cases where my Radar Engineers Model 250 Ultrasonic Detector proves useful is very small. This kind of device is only useful for pinpointing a specific device on a pole. It offers l; /archives//html/RFI/2016-05/msg00071.html (9,476 bytes)
4. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: Dave Cole <dave@nk7z.net>; Date: Thu, 19 May 2016 11:31:52 -0700; Which brings up the order of purchase for the aspiring RFI hunter... For me I purchased items in this order, over a few years.... 1. Mobile rig for hunting, FT-817. 2. Home made loop. 3. VHF handh; /archives//html/RFI/2016-05/msg00074.html (11,103 bytes)
5. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: HankP <pfizenmayer@q.com>; Date: Thu, 19 May 2016 14:46:04 -0400 (EDT); Bob -- I built the ULAD that was in QST some years ago and bought a parabolic reflector from Edmunds --I can hear birds - crickets my steps walking down the alley - two finger rubbed together at 200; /archives//html/RFI/2016-05/msg00075.html (9,553 bytes)
6. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: Hisashi T Fujinaka <htodd@twofifty.com>; Date: Sat, 21 May 2016 21:15:49 -0700 (PDT); I haven't actually confirmed this completely, but I think my MFJ detector picks up a lot of RF that is above ultrasonic. Pointing it at a fluourescent fixture picks up a lot of buzz. I bought it as a; /archives//html/RFI/2016-05/msg00077.html (10,551 bytes)
7. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: "qrv@kd4e.com" <qrv@kd4e.com>; Date: Sun, 22 May 2016 11:49:19 -0400; Have you looked at the new LimeSDR as the core of such a device? https://www.crowdsupply.com/lime-micro/limesdr 100 kHz 3.8 GHz David KD4E The APS RFI guys have the RADAR ENGINEERING ultrasonic recei; /archives//html/RFI/2016-05/msg00078.html (10,041 bytes)
8. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: Michael C Martin <mike@rfiservices.com>; Date: Sun, 22 May 2016 16:42:00 -0400; As long as you aren't trying to locate a specific light bulb on a pole you'll be OK! There are two things to find concerning RFI sources on a pole, that's sparking and corona. The biggest obstacle is; /archives//html/RFI/2016-05/msg00079.html (12,165 bytes)
9. Re: [RFI] MFJ 5008 ultrasonic receiver (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Mon, 23 May 2016 12:06:38 +0000; I agree, Mike. Ultrasonics give false positives on corona, and false negatives if something on the structure is blocking ultrasonic sound. I don't think that most hams need to use ultrasonic dishes.; /archives//html/RFI/2016-05/msg00080.html (14,063 bytes)

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