Hello Daniele, These poles were used to hold up camouflage nets. They are extremely sturdy and cheap! I have used them for years and they are very handy when you will quickly test an active antenna.
Daniele I would expect to Receive virtually no signal using an optical cable, because one of the dipole elements would be missing and you would only have the small probe element doing all the work an
Clemens, LF group! This is exactly the opposite that I experienced with the Mini-Whip. The higher I brought it up (= the farther I brought it away from the noise source, commonly called "house"), the
Hello Stefan, LF, may be it is not that simple, please have a look at final pages in this document: http://www.schwarzbeck.de/Datenblatt/m9243.pdf Regards Daniele
Hi Stefan, Some comments: I think the mechanism is that the unwanted signal on the screen causes a potential difference between gate and source of the first (J)FET. So this causes a current flow in t
Yes I'm sure it works. BTW, I work in the optical networks area of a well-known (swedish) company of telecom equipments, so I really trust optical comms ;-) The interesting thing would be to compare
Hello Minto, Stefan, Some food for thoughts: When I tested a mini-whip in the garden with battery feed and also with a battery fed SLM, I found the noise lower than when used inside and operated from
Hi Minto, Am 10.08.2011 13:10, schrieb Minto Witteveen: Hi Stefan, (et al) Well I beg to differ.. :-) What I think happens is this: The outside of the coax picks up electromagnetic radiation like any
Hello Andy, The antenna will work with an optical feedline. I can't imagine that fiber optic forms the other half of the dipole. The probe capacitance is rather low, about 3 pF. My guess is that the
Hi Gerhard, I think one has to compare two different situations: The pole that is on a noisy roof (and its noisy ground) and on the other side the pole that is far away in the garden, with its own an
Hi Stefan, (et al) Well I beg to differ.. :-) What I think happens is this: The outside of the coax picks up electromagnetic radiation like any antenna (including QRM generated by fluorescent lamps a
Mal ! I was talking about the "cheapest" 10m pole and as far as I can see on the web-page it is for 30.... Don't know about pounds but 30 is at least a very fair price! I personally one 2 of those 10
Hello Roelof, in fact a comparison, between a battery-powered Mini-Whip with optical feedline and another with "conventional" installation, would probably clarify the subject. One could measure what
Dear Mal, LF Group, Recently I got another Italian one, same size for £20 which is about the right price. That information might be helpful to someone, if you actually said who the Italian supplier w
Hi All, Roelof rather beat me to a comment. The use of optical "transmission" lines is, these days, an entirely practical solution to many problems. Optical devices are available for operation from b
Wow, what a discussion. Havent read all the comments so far but just a short answer to Minto: Am 10.08.2011 17:01, schrieb Minto Witteveen: A choke (only) at the TX would accomplish nothing (in fact
Hi Mal, Yes fluorescent lights (old AND new ones) are an annoying source of QRM. But I dont think my neighbors would appreciate me getting rid of _their_ lamps as well. You are right w.r.t. the cable
