Ive made several contacts up to about 2500 miles (West from NH) running 100W
into a single 750' #12 copperweld Beverage up about 8' using a FT114-43
autotransformer back in the 80's at a prior home. These were mostly on CW
during contests; the terminator was a 600 Ohm 100W NI resistor and the #24
transformer wire still looked as new.
Carl
KM1H
----- Original Message -----
From: "Rick Karlquist" <richard@karlquist.com>
To: "Brian Moran" <brianmo@yahoo.com>
Cc: <topband@contesting.com>
Sent: Thursday, November 15, 2012 3:16 PM
Subject: Re: Topband: Limiters - not T/R Relays
Brian Moran wrote:
Some sort of saturable transformer design, like
http://www.arraysolutions.com/Products/as_rxfep.htm ?
What is interesting about this is that it uses T1-6 transformers,
which I have been using and recommending for years for RX antenna
use. I have repeatedly been told that these are no good because
they will saturate at too low of a level and cause intermods, etc.
The design cited is an existence proof that these transformers
will work just fine in most situations. I'm only 6 miles from
a 50 kW AM BC station and I have never had any trouble with
T1-6 transformers generating spurs. I will note that the T1-6
has an especially large core, so it may be that the T1-1, for
example, is not up to the job.
FWIW, I accidentally transmitted into a beverage using a T1-6 transformer
with 100 watts, and it did not burn out the transformer.
Rick N6RK
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