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Old 04-19-2009, 22:56   #1 (permalink)
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Question How does the Shakespeare high survivability antenna whip fasten to the base?

I have purchased a used AS3916 antenna base (no antenna).

How does the steel antenna whip attach to the AS3916 base?

Based on what I have in my hands (missing the collet) it looks like there is a dished center contact in the top of the base. I am assuming that there is a swollen area at the base of the antenna whip and the the collet nut screws down into the base forcing the rounded bottom of the whip to make contact with the dished center pin. Is that correct or is my base broken beyond usability?

I do not have continuity between the center contact at the top of the base and the center pin of the bnc connector. I am assuming that there is a capacitor in line that will block the flow of DC current. I have not yet made the time to disassemble the unit.

Is there a quick way to check the AS3916 base to determine if it is functional?

Thank you for your help.
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Old 04-20-2009, 09:03   #2 (permalink)
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I had these on my truck. The steel antenna attaches using what we called a Jesus Nut.

Your assumption about the way the antenna mounts sounds correct based on what I've done to assemble mine.

Other than plugging it in, I don't know how to test it. No idea about the testing.
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Old 04-20-2009, 09:52   #3 (permalink)
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Without that jamb nut, it wont hold the antenna...
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Old 04-20-2009, 13:49   #4 (permalink)
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Thank you for your help. I was hoping to adapt the base to another antenna (I do not have the antenna itself). I have not contacted the factory about replacement parts.

I gather the threads are 1/2-20 NF.
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Old 04-23-2009, 03:55   #5 (permalink)
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Do you have a picture of the base?
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Old 04-23-2009, 05:30   #6 (permalink)
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Here's a link to the company website with photos and technical info.

Shakespeare Military Antenna Products - Model 4243 Antenna
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Old 04-27-2009, 09:17   #7 (permalink)
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Here is the reply from the Shakespeare Company LLC.

Quote:
We do not sell replacement parts for that antenna. From a logistical standpoint it is cost effective to purchase a new antenna.
From THEIR logistical standpoint with a List Price of $650.00 it IS more cost effective to sell a complete new antenna but it is not cost effective from my standpoint.
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Old 04-27-2009, 09:24   #8 (permalink)
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After finding this picture I understand how the wire antenna is held in place. The wire antenna passes through the collet nut and sets in a recessed portion of the base (about a 1/4" deep recession the diameter of the antenna) and then the collet nut when screwed in the base clamps the wire antenna in place.

So in theory if a collet nut could be found/made that has an opening that matches a chosen wire antenna then I should be able to mount different length/diameter whips. I assume the base could be made to work on a number of different frequencies (we will see).

Attached Images
File Type: jpg 4243 Parts.jpg (54.6 KB, 55 views)
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Old 05-04-2009, 22:49   #9 (permalink)
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I have a base that is a straight pass through, just the connector, the spring and the antenna contact. no matching equipment internal to it at all,
would something like that work for you?
part# AS-3449/VSQ-1
NSN 5820-01-183-9462
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Old 05-04-2009, 23:26   #10 (permalink)
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That VSQ-1 antenna cost Uncle Sam over $3,000 a copy. I almost had to pay for one once...
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