[Milsurplus] Tuning the ART-13/BC-348

[jay_coward at agilent.com]

Inside the CU-32 antenna tuner there is a nice spark gap assembly and all the solder joints are nicely rounded to prevent arcing at high altitude.Also the dynamotor has an altitude switch to lower the high voltage.
Jay

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of C Whitaker
Sent: Wednesday, May 04, 2005 8:24 AM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Tuning the ART-13/BC-348


de WB2CPN       2005.05.04

Considering the HF frequencies aircraft usually
use then and today, the outside fixed wire never
aproaches a quarter-wave long.  Ergo a very high
voltage feed point.  The only Low-Z antenna I've
encountered is when the trailing wire is run out
to Max antenna Current right out of the transmitter.
Maybe that's 70 Volts or thereabouts.

War Story Follows:  Once when I operated a BC-191
on LF as a beacon the antenna wire wasn't not very
long, so there was a high voltage at the antenna
tuner.  I could light my cigarette by pushing a
1 1/2 wire into it, and holding it up to the antenna
binding post with a wood stick.

73  Clete


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