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

[jeremy-ca]

Ive been using them since around 1984 when I ran network analyzer tests on 
them at work. Most pre CATV ones started to become useless around 30 MHz. 
Some CATV versions barely made it to the marked 5MHz lower limit while 
others made it all the way to 500 KHz with minimal insertion loss and still 
maintained an acceptable VSWR.

The easiest test is to try what you have and hope you get lucky.

Carl
KM1H
----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: <k4oah at mindspring.com>; <glowbugs at piobaire.mines.uidaho.edu>; 
<Boatanchors at mailman.qth.net>
Sent: Monday, October 01, 2007 11:45 AM
Subject: [Boatanchors] Re: GB> Collins R-388 vs 51J4


> 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
>
>
> --- Garey Barrell <k4oah at mindspring.com> wrote:
>
> You are correct.   Both are designed to work with a
> high impedance whip or single wire antenna.   Some use
> a TV receiver balun (nominally 70 to 300 ohms) as a
> step-up transformer.  Most are good all the way down
> to the upper BC band.
>
> Actually many boatanchor receivers are happier with a
> Hi-Z antenna up until the late 50's era and benefit
> from an "antenna input transformer".
>
>
>
>
>
>
>
>
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
>
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>