Hello group, here is a web page written by Owen, VK1OD with an analysis of how PA0RDT's Miniwhip antenna works: http://vk1od.net/antenna/PA0RDT-MiniWhip/index.htm You may find this interesting. 73, D
Hi Tom, That's exactly what I was going to propose but you have been quicker. :-) Take two miniwhips to form a dipole,feed it balanced by a proper balancing device and see what happens. We've done th
Wow, thanks. This can lead to a lively discussion :-) I think there are some misunderstandings by VK1OD. He states that Roelof says that: "noise is mainly magnetic". But Roelof means the local noise
G2AVJ* asserted that Maxwell had slightly over cooked things and there where no E and H fields , only vector potentials , may be the mini-probe is a near field array , as its certainly not big enough
Besides which, for a choke to actually work, it would need a reference point to work against , if the choke is at the end of a cable , then the whole assy will float , with any line voltage on the ou
Hello all, I tend to think about the mini-whip on LF and MF in terms of an (almost) static electric field. Then it essentially measures the electric field's _potential difference_ between a point som
Pieter-Tjerk, The electrostatic field analogy was pointed out in the AMRAD active whip article: http://www.arrl.org/files/file/Technology/tis/info/pdf/0109031.pdf (see p. 36 "Siting and Installatio
Hello all, what´s about two mini-whips mounted back to back? 73, Tom, DK1IS www.qrz.com/db/dk1is Am 06.07.2013 15:16, schrieb Pieter-Tjerk de Boer: Hello all, I tend to think about the mini-whip on L
Hi all, Am 06.07.2013 15:16, schrieb Pieter-Tjerk de Boer: Hello all, I tend to think about the mini-whip on LF and MF in terms of an (almost) static electric field. Then it essentially measures the
That's a datong active Ae ! G.. Hello all, what´s about two mini-whips mounted back to back? 73, Tom, DK1IS www.qrz.com/db/dk1is Am 06.07.2013 15:16, schrieb Pieter-Tjerk de Boer: Hello all, I tend t
Hello Pieter-Tjerk, Thank you for your analysis. The mini-whip works as a monopole vertial antenna, however contrary to a normal monopole the gap is not at the bottom, but at the top. The result is t
Hello Clemens, This is what I tried last weekend. It does not work as a dipole as you have two verticals, which were in my case two meter apart. 73, Roelof, pa0rdt
Hi Roelof, For a test, to isolate the Minwhip, could the signal be re-transmitted by a small transmitter, battery powered, at a higher frequency to a local receiver? Regards, Edgar Moonah, Tasmania.
Hi all, MiniWhip may be delived from Zepp antenna as shown in attached pic, as I think. So,it has no polality and will be sensitive for E-field at its point. Thank you Yuki JA5FP Attachment: miniwhip
Hello Stefan, I have been reading VK1OD's article with great interest. It is a pity that he has not discussed the antenna with yours truly. This should have avoided a number of inaccuracies. I have h
Hello everyone, Am 07.07.2013 00:45, schrieb edgar: Hi Roelof, For a test, to isolate the Minwhip, could the signal be re-transmitted by a small transmitter, battery powered, at a higher frequency to
Actually, I meant the real height above ground, multiplied by the free-space field strength. But of course, you are right that what the device responds to, is the field between the probe and the near
I'm pretty sure it won't work. The reason is that then the entire amplifier circuit, with everything which is electrically connected to it, is at essentially one place up the pole. All parts of that
Hi Clemens, Am 06.07.2013 18:14, schrieb Clemens Paul: [...] I would second Jays argument that it is virtually impossible to isolate the feedline effectively from the E-probe. 73 Clemens DL4RAJ ...th
Am 06.07.2013 20:32, schrieb Roelof Bakker: [...]However this is irrelevant as the output is easily adjusted by adapting the size of PCB antenna. That sounds so easy but unfortunately we have to figh
