[Milsurplus] Suggested tuning for ART-13 into a 50 ohm antenna on 75M?

[hwhall at compuserve.com]

The wattmeter is measuring reflected power from the feedline+antenna. There's a feedline like coax in there, I assume?

WayneWB4OGM

-----Original Message-----
From: Mack McCormick <w4ax.mack at gmail.com>
To: hwhall at compuserve.com
Cc: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
Sent: Mon, Mar 13, 2023 1:26 pm
Subject: Re: [Milsurplus] Suggested tuning for ART-13 into a 50 ohm antenna on 75M?

Wayne
Here is where I’m measuring power. Art-13 <> Bird Wattmeter <> Antenna.   Same results when using a resonant 3885 kc antenna or non-inductive dummy load. 
Thank for replying
MackW4AX
On Mon, Mar 13, 2023 at 14:56 <hwhall at compuserve.com> wrote:

How & where are you measuring reflected power?  Transmitter tuning usually doesn't affect reflected power fro the feedline & antenna.

WayneWB4OGM
-----Original Message-----
From: Mack McCormick <w4ax.mack at gmail.com>
To: milsurplus at mailman.qth.net
Sent: Mon, Mar 13, 2023 11:49 am
Subject: [Milsurplus] Suggested tuning for ART-13 into a 50 ohm antenna on 75M?

Friends,
How do you have your Antenna Loading controls setup for max forward power and minimum reflected power? I can’t seem to find a combination that yields high forward power with minimum reflected power. Your suggestions are most welcome!
I’ve owned ART-13’s for a long time and repaired many. I find the best tuning solution to be COARSE ANT LOADING at 6 (L Network) and a 4000pf cap from the bottom antenna terminal (RF side of the blocking cap). However this only gives about 60W forward power but almost zero reflected power. I’ve tried other combinations that provide more forward power but they always yield a lot of reflected power. 
I understand the ART-13 was designed to work on an aircraft antenna of much lower impedance (around 10 ohms). 
Thanks in advance,
MackW4AX-- 
73,
MackW4AXhttps://www.qrz.com/db/w4ax
______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
-- 
73,
MackW4AXhttps://www.qrz.com/db/w4ax
______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20230313/a5df1296/attachment-0001.html>