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Total 8 documents matching your query.

1. Topband: Beverage F/B using oscillator (score: 1): Author: Ashraf Chaabane <ash.kf5eyy@gmail.com>; Date: Tue, 9 Oct 2018 09:07:42 +0100; Hi All, I used a 1.843 oscillator to check NA beverage F/B. The mesurements were taken 160m away from each end of the antenna. Noise level was constant. I had 4 dB difference between front and back s; /archives//html/Topband/2018-10/msg00026.html (7,070 bytes)
2. Re: Topband: Beverage F/B using oscillator (score: 1): Author: Greg - ZL3IX <zl3ix@inet.net.nz>; Date: Tue, 9 Oct 2018 22:57:54 +1300; Hi Ashraf, The rule of thumb I use is 2D^2 /lambda, where D is the largest dimension of the antenna. So if your Bev is 320m long you need to be over a km away. If only 160m long you need to be 300 m; /archives//html/Topband/2018-10/msg00027.html (7,464 bytes)
3. Topband: Beverage F/B using oscillator (score: 1): Author: F Z_Bruce <k1fz@myfairpoint.net>; Date: Tue, 09 Oct 2018 09:01:07 -0400; Good information. Finding the best BOG F/B. I use an model MFJ-5014 white noise generator off the 'back' of the BOG antenna. Then tune the receiver to find the 'minimum noise' signal frequency. Adjus; /archives//html/Topband/2018-10/msg00028.html (8,533 bytes)
4. Re: Topband: Beverage F/B using oscillator (score: 1): Author: <pa5mw@home.nl>; Date: Tue, 9 Oct 2018 15:34:15 +0200; Additional question; with respect to the BOG/Beverage backlobe upwards angle, does the test-generator antenna need to be lifted from local groundlevel by say 2- 10m? Or can this test be done just as; /archives//html/Topband/2018-10/msg00029.html (8,663 bytes)
5. Re: Topband: Beverage F/B using oscillator (score: 1): Author: F Z_Bruce <k1fz@myfairpoint.net>; Date: Tue, 09 Oct 2018 10:31:37 -0400; With the BOG it is not very variable/ if any..(it does vary with conductivity of the soil) (consider sand as non-conductive) The Beverage can be tilted somewhat, however its not" one size fits all".; /archives//html/Topband/2018-10/msg00030.html (9,575 bytes)
6. Re: Topband: Beverage F/B using oscillator (score: 1): Author: "Edward Sawyer" <sawyered@earthlink.net>; Date: Tue, 9 Oct 2018 13:33:49 -0400; As a point of reference - I have 4 terminated beverages from 200 - 350m long (also 2 unterminated bererages). I use them on 40 - 160M. I typically see 10 - 25dB of front to back on these beverages. O; /archives//html/Topband/2018-10/msg00031.html (7,378 bytes)
7. Re: Topband: Beverage F/B using oscillator (score: 1): Author: Jose Orellana - EA7BJ <ea7bj@hotmail.com>; Date: Wed, 10 Oct 2018 13:03:21 +0000; Hi, Rash. You can look in the links that I put. IV3PRK explains how to adjust (gain and F/B) in a BOG and an RBOG. These explanations were very useful for me to improve my RX antennas. Hope this can; /archives//html/Topband/2018-10/msg00033.html (10,830 bytes)
8. Re: Topband: Beverage F/B using oscillator (score: 1): Author: "Ashraf Chaabane" <ash.kf5eyy@gmail.com>; Date: Mon, 15 Oct 2018 13:23:05 +0000; Greg, I re-did the exercise at 470m distance from both ends of the beverage and the F/B has increased to 7db. I was tired to go further in a VERY muddy ground but I will test again at near-field edge; /archives//html/Topband/2018-10/msg00066.html (8,574 bytes)

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