[TowerTalk] AB-577 top stub

[Pete Smith N4ZR]

Duhhh - I apologize for the stupid question.  I don't know what I was 
visualizing. Of course, what you describe is exactly how it works in my 
case, and I will simply need to substitute a longer piece of mast tubing 
in the upper clamp of the rotator.  Easy peasy.

73, Pete N4ZR
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On 7/27/2022 1:52 PM, Joe Subich, W4TV wrote:
>
> > My AB-577 (the first and only one I've ever been up close and personal
> > with) has a short stub of tubing that is integral with the top guy
> > connection, and on which my C-3 mounts nicely .
>
> How/where are you mounting your rotator?
>
> The "top stub" ("Antenna adapter" 80063; SM-C-423587) - shown in Fig
> 1-4, and Fig 2-12 in the "manual".  The bottom of the rotator "pipe
> mount" clamps to it (it's just over 2" outside diameter) with the mast
> clamped into the top of the rotator and antenna mounted to the stub
> mast above the rotator.
>
> I'd use a 6' piece of 2" x .120 tubing for the mast with the C3 as
> close to the top of the rotator as possible with a 3 or 4 element
> 6m yagi 5' above the C3.
>
> 73,
>
>    ... Joe, W4TV
>
> On 2022-07-27 12:32 PM, Pete Smith N4ZR wrote:
>> This is pretty speculative, so if anyone wants to erase now...
>>
>> My AB-577 (the first and only one I've ever been up close and 
>> personal with) has a short stub of tubing that is integral with the 
>> top guy connection, and on which my C-3 mounts nicely .  If I want to 
>> stack a 6-meter yagi on top of my existing tribander, I suspect that 
>> the best way to do so would be to telescope the bottom end of 6 feet 
>> or so of tubing inside the stub and put a bolt through to hold it 
>> both vertically and in rotation.  Just by chance, has anyone ever 
>> measured the inside diameter of that short stub (assuming that it is, 
>> in fact, part of the standard AB-577)? I'd hate to get the rocket 
>> launcher all the way down, only to find that the mast extension I 
>> will have selected is either too small or too large.
>>