[SEDXC] Front end protection--question

[Hal Kennedy]

That's correct Tad.  It just goes in series with the antenna and limits
levels to around 1 V.  Its quite clever inside.  It has a pair of back
to back binocular transformers inside, and at their interconnection
there are back to back diodes to ground hooked in with a fairly large
resistance.  As signals get above the conduction point the diodes start
to turn on which saturates the ferrite transformers and you get very
soft limiting.
 
I've build and tested a lot of limiters - these are the best I have
seen.  I have two here - they work FB.
 
Hal
(not too expensive either)
 
 
-----Original Message-----
From: Tad Williamson [mailto:ironbutttad at yahoo.com] 
Sent: Thursday, April 01, 2010 1:49 PM
To: Hal Kennedy
Subject: Re: [SEDXC] Front end protection--question
 

Hal, is this a passive device requiring no external power?  I went to
the website and that's what it looks like.
thanks, Tad, WF4W


 
"What a long, strange trip it's been"
 
The Grateful Dead
 
Truckin'


--- On Thu, 4/1/10, Hal Kennedy <halken at comcast.net> wrote:

From: Hal Kennedy <halken at comcast.net>
Subject: [SEDXC] Front end protection
To: "SEDXC" <sedxc at contesting.com>
Date: Thursday, April 1, 2010, 2:43 PM
I'm with Mike.  I use the ICE 196 for front end protection and limiting
on
receive antennas - they work great and are inexpensive.   They do not
clip
and re-radiate harmonics - they just soft limit...great product.
Hal

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