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Author Topic: 102" Whip Dipole  (Read 3832 times)
KE4VVF
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Posts: 61




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« on: February 13, 2012, 04:42:35 PM »

I was going to make a 102" whip rotatable dipole for 10 m using Radio Shack whips and a MFJ-347 dipole mount.  It was for stealth reasons and as a portable field day / mountain top DXpedition antenna.  Radio Shack apparently doesn't stock them anymore, or their supply dried up. 

Does anyone know of a good brand of SS whip for a horizontal dipole application?   I'm trying to stay away from the Hamstick type spiral wound gizmos and the MFJ Mini Dipoles.
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KC7YE
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Posts: 97




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« Reply #1 on: February 13, 2012, 04:47:25 PM »

DX Engineering has 108" whip
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SWMAN
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Posts: 571




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« Reply #2 on: February 13, 2012, 05:41:10 PM »

Copper Electronics has them also.
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AD5X
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« Reply #3 on: February 13, 2012, 05:52:38 PM »

MFJ sells a 108" SS whip.  The MFJ-1966 for $27.

Phil - AD5X
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W5DXP
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« Reply #4 on: February 14, 2012, 04:41:17 AM »

I'm trying to stay away from the Hamstick type spiral wound gizmos ...

It is a fact that a hamstick is very inefficient on the lower frequency bands, e.g. 75m. But hamstick efficiency is pretty high on 10m - same ballpark as that of a 1/4WL whip and they are less expensive than an SS whip.
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73, Cecil, www.w5dxp.com
The purpose of an antenna tuner is to increase the current through the radiation resistance at the antenna to the maximum available magnitude resulting in a radiated power of I2(RRAD) from the antenna.
K9SRV
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Posts: 121




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« Reply #5 on: February 14, 2012, 10:08:05 AM »

I just bought 2 from radio shack.
Only certain stores carry cb/ham stuff. Go to their website
do a search, and it should tell you the closest store that carries
them. Thats what I did, my local store didn't stock them but
one 6 miles away did.
Also, I went to menards and bought hollow 3/8 copper tubing
that I cut to add some length and you can cover 10-17 or so,
just by switching them out after lightly crimping to the steel
whip.
john
kb9ico
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KE4VVF
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Posts: 61




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« Reply #6 on: February 15, 2012, 07:31:15 PM »

KB9ICO, John,
These whips have been "out of stock" on the Radio Shack web site for a couple months.  Yesterday I went to a different Shack store and there are none in stock in this district so I convinced their manager to order them from a different region.  The store manager also told me that this item is very probably going to be discontinued.  Unfortunately special shipping from other internet vendors almost doubles the price.

It's a shame they keep dropping radio related items in favor of cellphones.  I still run my 5/8ths wave 2m Radio Shack mobile antenna and my venerable HTX202 as my daily HT. Both are 20 years old and still going strong.

KE4VVF, Tony
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K9SRV
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Posts: 121




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« Reply #7 on: February 15, 2012, 08:03:30 PM »

want me to see if I can buy a couple and ship em to you?
John
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WB6BYU
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Posts: 13341




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« Reply #8 on: February 15, 2012, 08:30:45 PM »

See who else locally carries CB radios and accessories - might be a truck stop or a store that
installs audio systems, or whatever.  Some may carry the straight fiberglass whips with a wire
up the inside instead of the stainless whips, but they should work just as well.
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K2DC
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« Reply #9 on: February 16, 2012, 03:51:09 AM »

Just looking at maps, there is a Pilot Truckstop just south of you on Statesville Ave. just past I-85.  They always have lots of CB stuff, and it might be worth a look there.

73,

Don, K2DC

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W5DXP
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« Reply #10 on: February 16, 2012, 04:45:21 AM »

Some may carry the straight fiberglass whips with a wire up the inside ...

Does anyone know the specified power rating for those fiberglass whips?
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73, Cecil, www.w5dxp.com
The purpose of an antenna tuner is to increase the current through the radiation resistance at the antenna to the maximum available magnitude resulting in a radiated power of I2(RRAD) from the antenna.
WX7G
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Posts: 6136




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« Reply #11 on: February 16, 2012, 09:13:37 AM »

DX engineering sells a 102" whip and MFJ sells a 108" whip.
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K7KBN
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Posts: 2814




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« Reply #12 on: February 16, 2012, 10:28:33 AM »

Does anyone know the specified power rating for those fiberglass whips?

Full legal CB power.
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73
Pat K7KBN
CWO4 USNR Ret.
ONAIR
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Posts: 1744




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« Reply #13 on: February 17, 2012, 12:19:06 AM »

If you want to save some money, you can substitute PVC pipe for those whips!  Just run some wire through them.
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W5DXP
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« Reply #14 on: February 17, 2012, 07:06:05 AM »

Full legal CB power.

Five watts AM? That's why I have only ever used them for top hat elements.
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73, Cecil, www.w5dxp.com
The purpose of an antenna tuner is to increase the current through the radiation resistance at the antenna to the maximum available magnitude resulting in a radiated power of I2(RRAD) from the antenna.
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