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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