I did some reading and one of the major differences appears to be that the
Ham IV uses a stainless steel ring gear as opposed to the pot metal gear.
The rotor I bought was just rebuilt with the stainless steel gear. So that
looks like a good thing.
The only other difference I can see in these is that there were some changes
made to the wedge brake.
The question I have no is what my rotor currently on my tower is! I'll have
to wait until spring when I do some antenna work to see what the stamp on
the bottom of the rotor is!
I was hoping one could tell just from physical appearance.
on 1/17/03 11:15 AM, Dale L Martin at firstname.lastname@example.org wrote:
>> I just bought a Ham M off eBay and got it today. It looks just
>> like my Ham
>> IV or at least what I thought was a Ham IV.
>> What's the difference and how can I tell?
> What's the stamped code say on the bottom of the rotator? (if it has a
> bottom mast clamp assembly, remove it to expose the flat bottom)
> I have a Ham-M here in the shack that says: H IV S1 Nov 88
> Meaning: Ham-IV, Series 1, November 1988
> Now. Whether it is actually a Ham-M or a Ham-IV, I can't say. It was sent
> in for refurbishment a few years ago. I don't know whether the bottom is
> the original bottom or not. Also, when I bought the rotator (actually, I
> bought the house and the tower, rotator and a TH7 came with it), I was told
> it was a Ham-M. :-)
> I have a Ham-IV up on the tower that says: H4 S1 Jul 80. It was in for
> service recently before replacing the "Ham-M" and I specifically asked for
> confirmation it was a Ham-IV. They (MFJ/Hy-Gain) didn't respond to that
> Check this out:
> Norm's Rotor Service - Identifying Your Rotor
> dale, kg5u
> AN Wireless Self Supporting Towers at discounted prices,
> See http://www.mscomputer.com
> Wireless Weather Stations now $349.95. Call Toll Free,
> 888-333-9041 for additional information.
> Towertalk mailing list
NA9D (ex: KE9NA)
Citizen of the People's Democratic Republik of Illinois
Life Member: ARRL, NRA
Member: AMSAT, DXCC
http://www.qsl.net/na9d <- Updated on 1/12/03!!!
"A life lived in fear is a life half lived."