Multi tap for the HF

Submitted: Friday, Feb 23, 2007 at 11:31
ThreadID: 42617 Views:2063 Replies:6 FollowUps:2
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Now that I have the HF up & running, I am looking at trying to get a multi Tap just in case the auto tune goes fut. ( ware belts & braces).
Anyone have any idea where I can pick up a second hand one with VKS taps. Tried the trader section & VKS site & ebay without luck.
Vince
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Reply By: Mike Harding - Friday, Feb 23, 2007 at 12:07

Friday, Feb 23, 2007 at 12:07
Make a simple wire dipole instead - it's been discussed on here before, I think I gave measurement in a post about 6 weeks ago.

You can buy a new tapped antenna here:
www.qsl.net/vk3frc/club_projects.htm

Mike Harding
AnswerID: 223521

Reply By: Member -Signman - Friday, Feb 23, 2007 at 12:24

Friday, Feb 23, 2007 at 12:24
The main channel for VKS737 is #2 (8022kHz). No real need for a multi band whip. Just make up a piece of wire about 8.8 metres long (1/4 wave of 8022), bung a connector one end that you can connect to the CENTRE pin of your antenna coax. An insulator on the other end with a length of nylon cord to throw over a branch.
Even with a multitap whip- an 'emergency' wire antenna is a must. Just roll it onto a fishing line spool and keep it in your spares bin in the vehicle.
If you must have a multiptap whip- try either Terlin Antennas or the Frankston Radio Club.
AnswerID: 223523

Follow Up By: Vince NSW - Friday, Feb 23, 2007 at 12:58

Friday, Feb 23, 2007 at 12:58
Thanks Mike & sand man.
Oldtimers must have a better hold than I thought. A Di pole is the answer & I am sure that I will have the making in the garage left over from Army days.

Must start trying to think again.

Vince
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FollowupID: 484389

Follow Up By: Mike Harding - Friday, Feb 23, 2007 at 13:15

Friday, Feb 23, 2007 at 13:15
Hi Vince

See here for good general info:
www.sgcworld.com/technicalInfoPage.html

and here:
http://www.sgcworld.com/Publications/Books/hfguidebook.pdf

and have a look at post 41656, follow-up 478443 for details of a wire antenna.

Mike Harding
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FollowupID: 484392

Reply By: Footloose - Friday, Feb 23, 2007 at 14:28

Friday, Feb 23, 2007 at 14:28
Wire aerials are a tad inconvenient if you need to listen for or make a call while driving. Search under Codan on Ebay. A guy I know sells whips for 737, and I recommend him. Any problems and he'll see you right. If he doesn't, see me and I'll make sure he does :))
AnswerID: 223548

Reply By: Member -Signman - Friday, Feb 23, 2007 at 14:38

Friday, Feb 23, 2007 at 14:38
Whilst I respect Mikes comments- admitedly a dipole/ inverted V may be more effective, it can be a hassle to get the centre terminal high enough to get the best out of the setup.
A simple long wire is far easier to erect- with height (although beneficial) is not that critical. I've operated with a long wire, insulated end tied of onto a shovel handle- from the top of the CSR into Adelaide, and from Halls Creek to St Marys base with it tied off onto a fellow travellers roof rack !!
If you have access to a SWR meter (than can handle 100W)- good idea to trim (either) before your tripping..
AnswerID: 223551

Reply By: Willem - Friday, Feb 23, 2007 at 14:51

Friday, Feb 23, 2007 at 14:51
Vince

I have a Multi-tap aerial and spring base sitting in a corner of the shed. It has VKS 8022 plus a host of others (20 taps methinks).

If interested you can email me through my website below
AnswerID: 223554

Reply By: Bilbo - Friday, Feb 23, 2007 at 15:38

Friday, Feb 23, 2007 at 15:38
I've got about 6 multi taps sitting in the shed. Must have a look and see what tappings are on 'em. I do know they all have at least RDFS freqs on 'em,,,,,,,,,,

If you get stuck, just ask me for a price.

Bilbo
AnswerID: 223565

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