[Milsurplus] ART-13 Transmitter and BC-348 Receiver info

[arc5 at ix.netcom.com]

----- Original Message ----- 
From: <k4pf at juno.com>
Subject: ART-13 Transmitter and BC-348 Receiver info

Tony Vernucci (I0JX) recently worked over an ART-13
to get it operational, and wrote up his experiences.
....

http://www.qsl.net/i0jx/ART-13_BC-348.pdf

--------------------------------

Something I just don't get....
A lot of people have found that adding a capacitor between the ART-13's
antenna output and ground lets it tune properly into a 50-ohm antenna.
But everyone who writes about this quotes a different value-
radically different.  For instance, in I0JX's article:

    "4.2 Improvement of transmitter efficiency on 40- and 80-meters
    I have experimentally determined that on 80 meters, and often also
    on 40 meters, some capacitance must be put in parallel to the antenna.
     More precisely, in my case:
   · on 40 meters, an extra parallel capacitance (about 300 pF) is needed...
   · on 80 meters an extra parallel capacitance (about 2,000 pF) was
    found to be absolutely necessary, as the RF output power
    would otherwise be very low......"

I got 120+ watts out on 75 mtrs with the ATC I rebuilt.
The cap I used was 500 pFd.  That's a long way from 3000.
And I've heard quotes all up and down.

What gives?

73 Dave S.