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[TenTec] Balanced tuners

To: <tentec@contesting.com>
Subject: [TenTec] Balanced tuners
From: k5uj@hotmail.com (Rob Atkinson, K5UJ)
Date: Fri Jul 11 14:03:40 2003
I'll add my vote for these.  I can't remember if I have already mentioned 
this here or not--one of my antennas is a low 88' dipole fed with 600 ohm 
open wire feedline and a balanced tuner.  It works great.  I use this all 
the time now on 40 and 80 instead of my gap vertical.   My tuner is a Bliss 
Z Matchmaster.  it uses a pair of 30 microhenry roller inductors and a 1000 
pf vacuum variable cap with a coax 1:1 current balun between the 50 ohm 
feedline from the tx and the tuning components.   it takes all the rf I can 
throw at it (1.2 kw p.e.p.).  my open wire feed is about 40' long.  the 
unbalanced line to the tuner is about 15' long.   Mine is the 1.5 kw manual 
transmatch which I guess is not made anymore since it is not mentioned on 
John Bliss's website:  

that's too bad because it was a lot less expensive than the motorized ones 
he makes now.   The Matchmasters are the Cadillacs.

Palstar has begun making a manual balanced tuner--I think it is the 
AT1500BAL or something like that.  It seems to have a few drawbacks:  air 
variable cap (however their inductors have higher max values than the Bliss) 
but the bigger problem is, unless I'm mistaken, that they use a ferrite 
balun which I think could saturate.  OTOH, the Palstar is closer to a 
typical manufactured tuner price.

It is probably possible to make one of these and save a lot of money.  I 
plan to extend my dipole to make a loop.

Rob Atkinson

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