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Author Topic: Ta-33  (Read 331 times)
KC8OLA
Member

Posts: 13




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« on: August 28, 2007, 01:14:07 PM »

I have a Mosley TA-33 beam ,I had a couple of people tell me I should use a 1:1 balun on this beam. When checked on what Mosley had to say, there is nothing refering to using a balun. Who's right?
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WC3O
Member

Posts: 2




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« Reply #1 on: August 28, 2007, 01:53:42 PM »

Best thing to do is use RG-8x and wrap a 6 to 10 turn loop (@ 6 inch dia) tyraped or taped and hook your RG-8 feedline to that (up at the antenna). It helps keep RF from coming back down the shield of the coax. Other than that, you need nothing. You can just hook it up straight too and see if you have any problems. Good luck and have fun! DE WC3O Bob
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AA4PB
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Posts: 12832




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« Reply #2 on: August 28, 2007, 05:16:33 PM »

On my TA-33 the shield side of the driven element is elecrtrically strapped to the boom. With that unbalance I doubt that the choke balun will have much effect - although it won't hurt anything.
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WA3SKN
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Posts: 5468




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« Reply #3 on: August 29, 2007, 05:36:48 AM »

Most beams use a gamma match.
If the Ta-33 uses a gamma, it will not need any balun!

-Mike.
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AA4PB
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Posts: 12832




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« Reply #4 on: August 29, 2007, 05:41:45 AM »

The TA-33 driven element is a dipole with one side connected to the boom. The coax shield goes to the boom side and the center conductor to the insulated side of the dipole. No gamma match.

In fact, most HF yagis don't use a gamma match because a gamma match wouldn't work on multiple bands. You usually find a gamma match on single band UHF or VHF yagis.
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KI4HLB
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Posts: 23




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« Reply #5 on: August 29, 2007, 07:58:53 PM »

Hi all,

I also have a TA33 and a TA53 with 40M and 6M kits, according to the engineers at Mosley, do not use anything but 5 turns of rg-213, 2 over three, at 6 inches, have it as close to the feedpoint as possible, you do not want to make a possible inductor.

Also be absolutley sure to have the connections to the feed points as short as possible or you are just making the radiator longer resulting in vswr issues.

The head engineer I spoke to there has been a ham for quite some time and made quite a bit of sense, also they do not recommend 9913, they prefer good old 213, which is what I use from the feedpoint to my lightning box, from there to the relay and into the shack is 9913.

So far I have no issues with the antennas and if I can hear a station usually they can hear me also, like the ad for my Icom 756 pro II goes "Heard it, Worked it, Logged it".

I also usually run barefoot with great results but of course I sometimes go QRO with one of my many amps...


73    ES    CUL    DE    KI4HLB

Hari
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