[Amps] Triband balun

[Carl]

In 1950 there werent many choices and upgrading wasnt part of their mindset.

Carl
KM1H


----- Original Message ----- 
From: "peter chadwick" <g8on at fsmail.net>
To: <amps at contesting.com>
Sent: Friday, March 21, 2014 5:33 AM
Subject: Re: [Amps] Triband balun


> 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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> >
>
>
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