[GCARC] Fwd: FW: SWR and ladder line

[Tom Gorman]

Tony,

You might want to switch to 600 ohm ladder line if SWR variations with
moisture are adversely affecting your operating during storms such as this
weekend, especially on contest weekends such as this.

Read eham reviews of both K4NA and W5KG on page 2 of 4 of website
www.trueladderline.com  Their rain and moisture problems were both
minimized when they switched from 450 to 600 ohm ladder line impedance.

BTW, you might also have better results with a 4:1 balun with RG8. Check
with the engineering folks at Balun Designs, www.balundesigns.com

They can recommend a 4:1 current balun for ladder line that works very well
with 600 ohm low loss ladder line. Possibly their Model #4111.

Hope this helps...

73,
Tom, KE2ES



---------- Forwarded message ----------
From: Jeff - Comcast <jeff.garth at comcast.net>
Date: Sun, Mar 30, 2014 at 8:41 PM
Subject: [GCARC] FW: SWR and ladder line
To: gcarc at mailman.qth.net


I am forwarding this for Tony because he sent it to the wrong address.



D. Jeffrey Garth

621 Greenbriar Drive

Williamstown, NJ 08094-1149

73, KC2WCS

Club Publications

www.w2mmd.org <goog_162360365>



"Choose a job you love, and you will never have to work a day in your life"
- Confucius



From: Tony [mailto:kd2afy at comcast.net <goog_162360365>]
Sent: March 30, 2014 20:07
To: gcarc-bounces at mailman.qth.net <goog_162360365>
Subject: SWR and ladder line



I'm hoping to tap the collective knowledge of the group on this one. I have
an antenna which is fed by 450ohm ladder line into a 4:1 balun to RG-8x
coax. I know there is no water in the balun or coax. Why does the SWR of
the antenna change dramatically in rain or snow? It's not a problem per se,
the tune handles it nicely, but it perplexes me.



73,

Tony



Tony Otlowski, KD2AFY
Assistant EC/ Net Control Manager/Asst. Skywarn Coordinator
Gloucester County, NJ ARES/RACES

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