In 1950 there werent many choices and upgrading wasnt part of their mindset.
Carl
KM1H
----- Original Message -----
From: "peter chadwick" <g8on@fsmail.net>
To: <amps@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@rogerhalstead.com>
To: amps@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
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>
>>
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>>
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>
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