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Author Topic: cutting antenna whip  (Read 1037 times)
KD8EYF
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Posts: 21




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« on: July 02, 2008, 11:51:36 AM »

I am about to cut the whip on my Larsen nmo 150 and the instructions are not clear.
Should i either

measure the whip after removing it from the metal cone with the 2 set screws cut and reinstall?

or

leave the whip in the cone and cut it so the length from the bottom of the cone to the top of the whip is teh specified length?

The difference is 3/8" inch...
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VA7IC
Member

Posts: 72




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« Reply #1 on: July 02, 2008, 12:27:21 PM »

You need to remove the whip from the coil and measure from the top of the whip down. (You do not want to cut the static ball off the top.) Cut the excess off and reinsert the whip.
A pair of small bolt cutters works well for cutting the whips
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KD8EYF
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Posts: 21




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« Reply #2 on: July 02, 2008, 01:10:19 PM »

ok so i just want to make sure i am understanding correctly.
Cut the whip to 48" as stated in the paper for 146mhz.
After inserting the whip into the stub and screwing the stub into the coil, the length of the metal radiating element including the stub is supposed to be 48 and 3/8" inches long???
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K0BG
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Posts: 9863


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« Reply #3 on: July 02, 2008, 03:59:31 PM »

Use the chart, and cut the length of the whip, from the bottom, to the length shown for 146.50. This will place the whip in the center (more of less) of the FM portion of 2 meters. If you mounted the antenna correctly (no brackets, mag mounts, etc.), the SWR will be close enough for most radios.

Alan, KØBG
www.k0bg.com
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KE4DRN
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Posts: 3722




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« Reply #4 on: July 02, 2008, 05:42:31 PM »

hi,

if you have a metal file handy,
just score the whip at the cut point,
then with pliers just bend the whip
and it will snap clean.

file it smooth any you're on the air !

73 james
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WA5UHK
Member

Posts: 131




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« Reply #5 on: July 02, 2008, 07:40:10 PM »

Put on some safety glasses before you snap it off.  Also a pair of gloves to protect your hands.
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K0JKM
Member

Posts: 5




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« Reply #6 on: July 13, 2008, 11:01:08 PM »

Cut long. Every installation is different. You can always shorten it. I use a file and then snap it off as per the manufacture. it will take you better that a week to get a replacement. Larsen is not really interested in dealing with hams.
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