[Amps] Triband balun

[Roger (K8RI)]

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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