[Collins] 51J series input coil antenna requirements.

[Glen Zook]

I have both a 51J-2 and an R-388.  The 51J-2
sensitivity is definitely improved with the use of a
TV balun when used with an antenna that is fed with 50
ohm coaxial cable.  Such indicates that the antenna
input is for higher impedance balanced feed.  The
R-388 works fine with antennas fed with 50 ohm coaxial
cable.

For the article on using TV baluns that was in
Electric Radio a while back go to

http://k9sth.com/Page_2.html

and scroll down to the "Articles" heading.  The
article on the TV baluns is the 16th down from the
top.

Glen, K9STH


--- Bill Kirkland <kirklandb at sympatico.ca> wrote:

There is an archived letter from me that lists the
differences between the 51J(j-2), the j-3(r388) and
j-4.  There are differences in the antenna circuit
between the j/j-2 and the j-3/j-4 but not between the
j-3 and j-4.  As Jerry points out, the J-4 is a
modified J-3 - mechanical filter module.









Glen, K9STH

Website:  http://k9sth.com


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