I use a BN-86 on my TH-7DX and have for many years. And I run 1500 watts
out on RTTY in contest mode. Never burned up one yet!
73
Jim W7RY
--------------------------------------------------
From: "Gene Fuller" <w2lu@rochester.rr.com>
Sent: Wednesday, March 16, 2011 5:07 PM
To: "Mike Baker" <k7dd@cox.net>; "'Diane & Edward Swynar'"
<deswynar@xplornet.ca>; "'towertalk'" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Hygain TH3
> I certainly agree with Mike re the BN-86. The PO of the TH-6DX that I
> rebuilt only used 100 watts so it had been no problem. However, with 1.5
> KW
> it's not long for this world. If you're not one to get up tight over such
> things, the old 8 or so turns of coax maybe about 8" diameter would be not
> too bad a starting point. I realize that this is a controversial point,
> that's why I say "a starting point'. There are certainly more elegant, and
> technically superior ways too do a balun, but the coax coil is better than
> nothing, inexpensive and quite reliably.
>
> Gene / W2LU
>
>
> ----- Original Message -----
> From: "Mike Baker" <k7dd@cox.net>
> To: "'Gene Fuller'" <w2lu@rochester.rr.com>; "'Diane & Edward Swynar'"
> <deswynar@xplornet.ca>; "'towertalk'" <towertalk@contesting.com>
> Sent: Wednesday, March 16, 2011 5:59 PM
> Subject: Re: [TowerTalk] Hygain TH3
>
>
>> Hi Guys,
>> I concur with the disassemble, clean, lube, reassemble list and
>> keeping the drain holes pointed down. I have used both Penetrox and
>> Bencher's Butter-its-not between conductors and where stainless steel
>> hardware is use, a suitable thread lube to prevent galling of the SS
>> threads. Nylock nuts are a blessing that helps get rid of the cut washers
>> and makes everything stay together.
>> When I did the last set of traps on a TH-5, I used a very sharp
>> drill bit and drilled out the dimples carefully so the hole was cleanly
>> cut
>> and didn't leave a flash at the hole edge inside to cramp up the removal.
>> When I reassembled the traps, I used a good grade of RTV (Loctite Blue
>> Silicone Gasket Material and just plugged them with an oversize mushroom
>> head dimple to keep out the water and grunge.
>> When you perform your rebuild, you might want to scrap the BN-86
>> balun (if you used one) for something a bit more efficient. If you run an
>> amp replacement is not a question: it's a necessity. The BN-86 was never
>> designed to handle 1500W, especially if you are running RTTY or similar
>> full
>> duty cycle modes.
>> They are a good antenna. I wish I hadn't sold mine years ago.
>>
>> Mike Baker K7DD
>> K7dd@cox.net
>>
>>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of Gene Fuller
>> Sent: Wednesday, March 16, 2011 10:16 AM
>> To: Diane & Edward Swynar; towertalk
>> Subject: Re: [TowerTalk] Hygain TH3
>>
>> Hi Eddy -
>>
>> A few years ago I rebuilt an old heavily damaged TH-6DX. I cleaned and
>> "greased" (Penetrox) all of the tubing "joints". Took apart all of the
>> traps
>> and cleaned them and "greased" all of the electrical contact areas.
>> Replaced
>> the hardware with ss where possible. It has worked great since and was
>> well
>> worth the effort. The closest thing to a problem was getting the cans off
>> the traps because of the dimples they put in the cans after assembly. I
>> found a piece of tubing, with o.d. just smaller than the i.d. of the can,
>> that I could insert and tap on to force the trap form out.
>>
>> Gene / W2LU
>>
>>
>> ----- Original Message -----
>> From: "Diane & Edward Swynar" <deswynar@xplornet.ca>
>> To: "towertalk" <towertalk@contesting.com>
>> Sent: Wednesday, March 16, 2011 12:50 PM
>> Subject: [TowerTalk] Hygain TH3
>>
>>
>>> Hi Guys,
>>>
>>> This has nothing particularly to do with TOWERS, per se, but I'm
>>> wondering
>>> if anyone reading this might have an idea, or two (it'll require
>>> CLIMBING
>>> the tower here in any event, I'm sure!).
>>>
>>> Specifically, I have a Hygain TH3 - Mark III 3-element tri-band yagi at
>>> 48'
>>> here that has basically been idle, as I concentrated my efforts on the
>>> low
>>> bands for some 4 years now. Anyway, I re-discovered 10-meters with the
>>> inordinately high sunspot count of late, and pressed the yagi into
>>> service
>>> there with stellar results.
>>>
>>> Inspired, I next tried the antenna on both 20- and 15-meters, but was
>>> shocked to see the SWR inordinately high right across each band...
>>>
>>> Obviously something up there has gone awry in the preceding years---but
>>> why
>>> is it still A-OK on 10-meters...?
>>>
>>> Thanks in advance, with my vy
>>>
>>> ~73~ de Eddy VE3CUI - VE3XZ
>>>
>>>
>>>
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>> _______________________________________________
>>
>>
>>
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