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

[Mack McCormick]

Yes, that is correct.

On Mon, Mar 13, 2023 at 15:32 <hwhall at compuserve.com> wrote:

> The wattmeter is measuring reflected power from the feedline+antenna.
> There's a feedline like coax in there, I assume?
>
>
> Wayne
> WB4OGM
>
> -----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
>
> Mack
> W4AX
>
> 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.
>
> Wayne
> WB4OGM
>
> -----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,
>
> Mack
> W4AX
> --
> 73,
>
> Mack
> W4AX
> https://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,
>
> Mack
> W4AX
> https://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,

Mack
W4AX
https://www.qrz.com/db/w4ax
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20230313/f0c7023d/attachment.html>