[ARC5] arc5 as antenna tuner

[Mike Hanz]

Yeh, I'll be the first to admit that 50w is pretty conservative, but the 
plate spacing is a little tight for an order of magnitude power increase 
if you live a mile above sea level - say in Denver or Albuquerque.  I 
have no doubt under ideal conditions (sea level QTH, antenna VSWR of 
~1.0, etc.) you could even use them in a kilowatt rig, but there are so 
many variables I would be a little hesitant to recommend anything much 
over 50w.  Fortunately, there is little to lose if something arcs over, 
so experimentation is probably worth it.

I'm still trying to find the article in the depths of my basement - 
seems like a tracking ability with both caps in a pi network might be a 
slick thing to have in some situations.  The only problem with taking 
the parts out of the chassis is that the roller and cap mountings are a 
bit more complex than the Johnson or B&W variety.  On the other hand, 
the prospect of using them in the original chassis isn't very pretty, 
either....

73,
Mike

fkamp@attbi.com wrote:
> I have to agree that an ARC-5 chassis would make a lousy base on which
> to build an antenna tuner.  You would be better off mounting the parts
> on a scrap of plywood.
> 
> However, I am just as sure that the caps and the coil out of an ARC-5
> transmitter would handle more than 50 watts.  I have used ARC-5
> transmitting variables as plate tuning caps in amps running about 500
> watts input (pair of 811's).
> 
> Regards,
> Frank Kamp
> 
> Mike Hanz wrote:
> 
>>Yes, but then the attempted desecration arm of our group would have to
>>kill you...  :-)
>>
>>More seriously, the roller coil and variable caps can be useful for
>>making a low power tuner (~50w or less) and those are generally
>>available in a junker or separately.  There's an awful lot of wasted
>>space if you use even a junker solely for that purpose, though.  Is
>>there any particular reason you were looking to use that particular
>>chassis as a platform?
>>
>>73,
>>Mike
>>
>>K8NKE wrote:
>>
>>>i seem to recall seeing some info to make a antenna tuner out of a arc5
>>>transmitter. i cant seem to locate it know and was wondering if any one
>>>knows where i could find it.
>>>tia dale k8nke
>>
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> 
>