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

[howard holden]

A high SWR can also give an artificially high apparent forward power.

WB2AWQ

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows

From: hwhall at compuserve.com<mailto:hwhall at compuserve.com>
Sent: Monday, March 13, 2023 11:56 AM
To: w4ax.mack at gmail.com<mailto:w4ax.mack at gmail.com>; milsurplus at mailman.qth.net<mailto:milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] Suggested tuning for ART-13 into a 50 ohm antenna on 75M?

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<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.qrz.com%2Fdb%2Fw4ax&data=05%7C01%7C%7C15e260c811144a900f6108db23f4a6e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638143305899757454%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Rmq%2ByS%2FIM7npv28521BmgpNWwP4HT1BjB2aXp3zG338%3D&reserved=0>
______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Fmilsurplus&data=05%7C01%7C%7C15e260c811144a900f6108db23f4a6e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638143305899757454%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3kAdnbUpyIPQexmEGomG3qUornxHBZpt6q4A5OXYV5w%3D&reserved=0>
Help: http://mailman.qth.net/mmfaq.htm<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=05%7C01%7C%7C15e260c811144a900f6108db23f4a6e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638143305899757454%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=JfYkNhckdUry0tMSITPGT4QPNy4wM3pRTvH9BHB22no%3D&reserved=0>
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2F&data=05%7C01%7C%7C15e260c811144a900f6108db23f4a6e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638143305899757454%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=wjoDkNBFq4SGN1Q6vuYaA6KqMyl%2BI3NdzYsxtzIA4QE%3D&reserved=0>
Please help support this email list: http://www.qsl.net/donate.html<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=05%7C01%7C%7C15e260c811144a900f6108db23f4a6e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638143305899757454%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=rcR3rxF1YyVpvqwwTRR4GX0BRaMpLyJxXvyZusm0zkY%3D&reserved=0>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20230313/0267822f/attachment-0001.html>