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". Low angle signal signals are not affected, high angles somewhat. (end height affect end impedance) At one location very low angle neighborhood noise may be worse. Decide what you want and computer model it 73 Bruce-k1fz On Tue, 9 Oct 2018 15:34:15 +0200, wrote: 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 reliable on groundlevel? 73 Mark, PA5MW -----Original Message----- From: Topband On Behalf Of F Z_Bruce Sent: Tuesday, October 09, 2018 3:01 PM To: ash.kf5...@gmail.com; Topband Subject: Topband: Beverage F/B using oscillator 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. Adjust the BOG antenna length to bring it into 160 meters.. Care must be taken not to create a neighborhood noise problem. 73 Bruce-k1fz On Tue, 9 Oct 2018 09:07:42 +0100, Ashraf Chaabane wrote: 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 signals. Is that what I should expect? Is 1 wavelength distance enough to do this experience? This will be repeated with different terminations and I want to make sure I'm doing it correctly. It will also be applied on the newly installed BOG to determine optimum length. Tnx and see you on the air! -- Ash ~ 3V8SF Topband: *http://www.kf5eyy.info/topband.htm * Phone/SMS/Whatsapp: (+216) 22670026 Skype: kf5eyy _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband