Re: Topband: impedance of 3/8 radiator and question on matching

[Carsten Esch <carsten.esch@appello.de>]

... ok, with the help of DJ2YA I made some math ... Seems the 3/8 lambda 
will be around 200 Ohms ...
- for 80m I will put abt. 80pF in Series to the antenna and feed the 
vertical through a 4:1 balun
- to match it for 160m I will put abt. 29uH in Series and abt. 4uH to 
ground to get a match to 50 Ohm
Will keep you updated (if interested) on the progress ;-)

73ss

Carsten, DL6LAU


Am 20.10.13 15:34, schrieb Carsten Esch:
> Hi,
>
> I am playing with a 3/8 radiator for 80m (to the time being fed 
> against 40 radials of each 40m length).
> What is the impedance I should expect from a 3/8 radiator?
>
> My plan was to use it as a 3/8 on 80m and match it for you on 160m too 
> (until we will put a Gamma match on our 60m tower).
> Here is what I measured with my AIM today:
> https://www.dropbox.com/s/48sp1703lnaiyu1/3%3A8_Test.bmp
>
> (and here the actual *.SCN file):
> https://www.dropbox.com/s/ql17wcsk2rpqj1o/3%3A8_Test.scn
>
> Any advise on matching would be welcome ;-)
>
> Thanks!
>
> Carsten, DL6LAU
>
>
> _________________
> Topband Reflector
_________________
Topband Reflector