[Hammarlund] TV Baluns again

Fri, 6 Feb 2004 11:54:49 -0600

Several years (5) ago I went down the road of testing a TV balun for my
HQ-120-x receiver.  The 120's antenna inputs are designed for 600 ohms and a
50 ohm antenna severely loaded down the input tuned circuits so even RF
alignment wasn't possible.  Using my HP606B generator I was able to test
various input balun designs.  The TV balun ( I don't know the type )  I used
improved the performance but as I went down in frequency toward 160m the
gain started dropping off pretty signicantly (I don't remember how much).
So I built a 9:1 balun (matching ~50/75 to ~600) with a T50-2 core from
Amidon and it worked much better than the TV core on all bands from 160m to
10m; especially at the lower frequencies.  I was also able to complete that
RF alignment with no trouble.

I know I have been hearing that the TV baluns work good so I don't quite
understand why my experience was so different?

73s and good luck, Dennis, k0eoo

-----Original Message-----
From: Dave Faria [mailto:[email protected]]
Sent: Friday, February 06, 2009 12:11 PM
To: hammarlund; Glen Zook
Subject: Re: [Hammarlund] TV Baluns again

For those who are interested Al Tirevold sent me the following sites on
winding your own balun.  When I finish I will have a balun capable for both
receiving and transmitting.  I'm building a "Tilted Terminated Folded
Dipole" requiring a 16 to 1 balun.  The toroid I'm using cost $18.50 and is
suppose to be good for 5kw.  When I finish I'll have about $60 in materials
costs.  I'm using the Amidon's "K" material for the toroid.  A less
expensive material #61 will also work.  The 61 toroid is only $9.

http://www.zl6qh.com/000225.html
http://www.w8ji.com/transmitting_baluns.htm
http://www.w8ji.com/core_selection.htm
http://www.qsl.net/iz7ath/web/02_brew/11_balun/pag01_eng.htm
http://www.rason.org/Projects/balun/balun.htm
http://www.realhamradio.com/Stack_Match.htm

73
Dave Faria
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