[Amps] Triband balun

[peter chadwick]

For both my T2X and CD45 rotators, I replaced the terminal strip with an aluminium plate fitted with a proper IP66 rated cable gland and a 2 foot tail of cable. That joins the main run of cable, the joint being a coupler for 50mm plastic waste pipe with screw on ends, blanking plugs fitted with IP66 cable glands and joining terminal block inside - also a bag of silica gel. Not liking cable hanging supporting its own weight, I always use a messenger rope and tape all the cables (coax and rotator) to that - telescoping towers can't have cables taped to them.

What Hy Gain were thinking off when they used an unprotected terminal strip I don't know - or were they just thinking of locations like the California desert?

73

Peter G3RZP


========================================
 Message Received: Mar 21 2014, 09:19 AM
 From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
 To: amps at contesting.com
 Cc: 
 Subject: Re: [Amps] Triband balun
 
 On 3/21/2014 3:35 AM, Jim Smith wrote:
 > Gary
 >
 > If you want to make a balun by coiling up a bunch of coax you should
 > check this out first.  Removes all the anecdotal BS and gives you
 > something real to work with.
 >
 > http://www.k1ttt.net/technote/airbalun.html
 >
 > When I replaced my TH3 balun I used a DX Engineering current choke,
 > including the appropriate clamps for attaching it to the boom.  Been
 > using the TH3 since 1967.  Only recently got an amp, though, which is
 > when the balun failed.
 >
 >
 > Roger,
 >
 > I had a look for the connectors you mentioned.  It isn't clear to me
 > which ones would be appropriate for the Ham M.  Do they mount in place
 > of the terminal board or do they just hang from wires dangling from the
 > rotator?
 
 They have a bulkhead plate that mounts in the hole where that termonal 
 strip resides (2 screws). There is a hole with a grommet for the cable. 
   The ends of the cable solder to the places where the wires from the 
 terminal strip went.
 http://www.hy-gain.com/Product.php?productid=870596 shows the parts.
 
 There's a parts pack (870598) that "might" be the whole works, but I'd 
 call Hy-gain and ask them specifically.
 
 You can put a half knot in the cable inside the rotator that rests on 
 the plate.  I'd not hang a 100 feet of cable on it, but it's plenty good 
 enough to hold a cable that is taped to a tower leg.
 
 This is just the rotator end, there is a matching female cable end.(part 
 # 870597)  When I bought my conversions they came as a set.
 
 They are not waterproof, but can easily be made so.
 
 If you have to rebuild any of the Ham series, I think these are well 
 worth the extra work to make the conversion.
 
 73
 
 Roger (K8RI)
 
 >
 > 73, Jim    VE7FO
 >
 > On 2014-03-19 18:05, Roger (K8RI) wrote:
 >> ny suggestions for a better alternative that will hold up in a RTTY
 >>>> contest?
 >>>>
 >>>> Thanks,
 >>>>
 >>>> Gary
 >>>> KA1J
 >>>
 >>> REPLY:
 >>>
 >>> I had the same problem many years ago. Hy-Gain made a replacement balun
 >>> called the something-2000, which did the job. I don't know if Hy-Gain is
 >>> even around anymore, but if you can find one, that will fix it.
 >>
 >> Hy-Gain is still around. Same people, even in the same buildings, or
 >> were when I called about parts for the AV640 vertical a few months back.
 >> The only difference is, I believe they are owned MFJ.
 >>
 >> I see they are advertizing the new connector kit for the tail
 >> twister/Ham series rotators which work on all the Ham series and a
 >> marked improvement over the old terminal strip.
 >>
 >> www.hy-gain.com
 >>
 >> 73
 >>
 >> Roger (K8RI)
 >>
 >>
 >>>
 >>> 73, Bill W6WRT
 >>>
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 >
 
 
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