QRZ Forums - Antennas, Feedlines, Towers & Rotors for Friday 3 March 2017
 

Antennas, Feedlines, Towers & Rotors

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Question (Help) Re Doublet Antenna

Posted: 03 Mar 2017 02:18 AM PST
http://forums.qrz.com/index.php?thre...ntenna.557482/

Im looking for help please with building my first HF antenna....



Im going to fabricate a multiband doublet with 300Ohm ladder line. My
FT-450D has a 7:1 internal tuner, so for now at least (until I can afford a
balanced tuner), Im looking to place just a balun between the ladderline
and some RG213 coax to the radio. However, most instructions say to use a
4:1 current balan, while two others say it needs a 2:1 item.



Can anyone clarify which I actually need, and what the difference...



Question (Help) Re Doublet Antenna

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Planning a 6m/2m, antenna mast & mount questions

Posted: 02 Mar 2017 09:00 PM PST
http://forums.qrz.com/index.php?thre...stions.557523/

After some great input in the VHF/UHF forum on my 6m antenna choice, Im
moving here for specifics on putting up the mast and mount. This will be a
a Cushcraft A50-5S Yagi, with a 2m/440 Ringo Ranger on top, and a rotator
underneath. It will be mounted on the back of a garage, on the side (not on
the roof). Ill run 2x6s across the peak as a support, and use something
like these mounts -
http://www.homedepot.com/p/3-in-Univ...9025/203763056



Here...



Planning a 6m/2m, antenna mast & mount questions

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Using 80/40m Inverted Vee as a 160m TEE

Posted: 02 Mar 2017 07:50 PM PST
http://forums.qrz.com/index.php?thre...0m-tee.557514/

I was considering using my dual band vee as a 160m TEE by shorting out the
bottom of the 65 coax run to ground, working against a radial field, and
perhaps installing some sort of LC network for matching. The legs of the
dual band vee would serve as top loading.



Any feel for how well this would work??



My antenna options are limited due to carnivorous trees which snag any wire
or cord that gets within 5



Feeleep

KA4KOE

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Radio interfence

Posted: 02 Mar 2017 09:54 AM PST
http://forums.qrz.com/index.php?thre...rfence.557513/

Hello to all, I have a problem. I have a 35 utility pole that I have both
a dual band 2 meter antenna on top, and 2 below I have wireless internet
radio. The dual band is a Tram 1481. The wireless internet antenna is a
dish and radio style, and it is running on 2.4 ghz. Here is an image. This
internet radio when plugged into my network router and I turn on my Kenwood
TM 281a VHF radio, I get a high pitch hum. Both feed lines run side by side
down the pole and into the shack. There are no...



Radio interfence

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Best type of co-ax to bury sub-soil?

Posted: 02 Mar 2017 06:08 AM PST
http://forums.qrz.com/index.php?thre...b-soil.556929/

I want to erect two beverage antennas, for reception on LF and one LF
antenna for TX. What are the best types of co-ax to bury sub-soil and not
deteriorate too much? Being LF might help keeps cost down, but the TX one
would have to be co-ax able to handle a kilowatt or more. Runs would be 50
meters or so for the RX one and 100 meters or so for TX. Thanks.