Topband: Limiters - not T/R Relays

[ZR]

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 at karlquist.com>
To: "Brian Moran" <brianmo at yahoo.com>
Cc: <topband at 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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