Аморето
Спасибо, я её на днях на предидущей странице и приводил, просто хотелось знать если кто либо пользвоал это на самом деле либо еще каким либо другим образом.
FC-40:Сообщение от Александр Васильевич
http://www.eham.net/reviews/detail/4516
http://www.eham.net/reviews/detail/4516I would like to add that I found I could significantly extend the usability of the FC-40 by using a simple broadband step-up torroidal transformer which took only 20 minutes to construct (10 quadrifilar turns on a 2 inch torroid). See the ARRL Antenna Handbook or other common texts for details.
I got the idea when I found I could not tune some lengths of longish wire (inevitable of course). I used my MFJ-259B antenna analyser to examine the impedance of the wire at the feedpoint (disconnect the FC-40) and found it was high at around 600 ohms or more when the FC-40 had difficulty.
When the 16x winding on the torroid was connected to the wire, the impedance as measured on the torroid primary was reduced and varied between typically 20 to 300 ohms across all bands.
I found these values tunable by the FC-40 and allowed my wire (approx 120m) to tune from 160m to 10m, with excellent signal reports.
I also experimented with a short vertical on my mobile, using the torroid back to front so as to step the low impedance (3-4 ohms) of the short vertical up to 50+ ohms to feed to the FC-40. That worked a treat as well but of course a short vertical remains a very inefficient antenna.
AH-4: по АН-4 уже 97 постов на 10 страницах перечитывать время надо если снова найду то приведу цитату
http://www.eham.net/reviews/detail/1071
Вместо форума надо смотреть отзывы т.е. ревью, хотя в гугле их показывает почти что в самом верху.