[Boatanchors] Re: GB> Collins R-388 vs 51J4

[Al Klase]

RE:  9:1 Baluns

Yes, older receivers, designed for random-wire antennas generally have 
an input impedance in the neighborhood of 400-600 ohms.  This a good 
compromise between the resonate (quarter-wave x N) and anti-resonate 
(half-wave x N) case.  The R-388 is designed to work with a 15-foot 
whip, an even higher impedance situation. TV baluns are a crap shoot at 
HF, often loosing effectiveness below 10 MHz, and you probably want a 
1:9 anyway.  It's easy to make equivalent devices, and the required 
cores are very useful around the shack.  You guys have shamed me into 
updating my website:  http://www.skywaves.ar88.net/ANTENNA/antsys.htm

Regards,
Al

Glen Zook wrote:
> The article that was in Electric Radio a while back
> about using television baluns on the older receivers
> can be found at
>
> http://k9sth.com/Page_2.html
>
> The link is about 2/3rds the way down the list of
> links and is entitled "Using television baluns to
> improve receiver sensitivity".
>
> Glen, K9STH
>
>
>
>   

-- 
Al Klase - N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/