[ARC5] [Boatanchors] ART-13 Output Matching

[jcoward5452 at aol.com]

Has anyone tried the 3 cap accessory (can't get a grip on the nomenclature,I have one buried in the boxes somewhere) that is made of (3) 25 mmf (I think) air dielectric caps on a mounting plate? These have push type binding posts to ease configuration when changing frequencies.This was used of course with a low impedance aircraft wire antenna, not a 50 ohm impedance type.
 Jay KE6PPF


-----Original Message-----
From: mac <w7qho at aol.com>
To: Discussion of AN/ARC-5 military radio equipment. <arc5 at mailman.qth.net>; David Stinson <arc5 at ix.netcom.com>
Cc: boatanchors at mailman.qth.net
Sent: Fri, Jul 2, 2010 11:18 am
Subject: Re: [Boatanchors] [ARC5] ART-13 Output Matching


Fixed shunt capacitors are used by many people and a broad range of  
alues all seem to give satisfactory results.  In ER#7, Nov. 1989,  
alt Hutchens (KJ4KV) recommended 800 Mmf for 75M and 100Mmf for 40  
nd 20M.  In ER#30, Oct. 1991, Bill Kleronomos (KD0HG) reported 560  
mf as being "ideal" for 160, 80 and 40M and 100MMf for 30, 20 and  
7M.  Don't remember exactly what values I finally settled on (caps  
idden behind a panel) but use a single value for 75 & 40 and  
omething larger for 160.  Tribute, I guess, to the broad range of  
ariability built into in the ART-13 tank circuit.
Detailed breakout schematic of the ART-13's tank circuit in all it's  
witchable variations available on request.
Dennis D.  W7QHO
lendale, CA

On Jul 2, 2010, at 4:34 AM, <arc5 at ix.netcom.com> <arc5 at ix.netcom.com>  
rote:
> I haven't done nearly as much work with the ART-13
 as many of you have.
 What are you opinions on the best means of matching
 an un-hacked ART-13 to a 50-ohm antenna?

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