[TowerTalk] Telrex Monoband matching

[Paul Cassel]

Ok - good point re QRO as I run an ALPHA 87A.   


best regards
_________________________________
Paul Cassel
(519) 634-5139 home
(519) 749-7427 Blackberry  

-----Original Message-----
From: NPAlex at aol.com

Date: Mon, 2 Jul 2007 11:52:17 
To:paul at ve3sy.com, towertalk at contesting.com
Cc:wa3gin at comcast.net
Subject: Telrex Monoband matching


Paul,
I think you will find that the Coax BalUn cable length is 1/2 wL to get a 180deg phase shift and create the "balanced" feed.  When the voltage is "high" on terminal 1, it is "LOW" on terminal 2 and visa versa. 
 
The commercial balun should work, but could be inferior to the coax balun for QRO power.  
 
 
Regards,
Norm W4QN
===========================================
In a message dated 7/2/2007 11:32:00 AM Eastern Daylight Time, paul at ve3sy.com writes:

Now for the matching - the consensus for the T match is something in the 200
ohm range requiring a 4:1 balun which makes sense based on the type of 1/4
wave coax balun shown in the 10 and 15 metre manuals.   I assume a
commercial ferrite 4:1 balun could be used in place of the 1/4 wave coaxial
originally specified?

Paul VE3SY

 

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