An addendum to this e-mail...
I guess the tower is a fold-over, not a tilt-over, that's hinged at about
the middle. My mind can't deal with subtleties of that sort ;>)
On Thu, Jun 3, 2010 at 8:20 PM, Jack/W6NF <vhfplus@gmail.com> wrote:
> Four questions:
>
> 1) Does anyone know the value of the secondary voltage on the transformer
> in an HDR-400/Roto-Brake controller? I have documentation on the rotor but
> it does not mention a secondary voltage value. I do not have the controller
> but am considering duplicating the original circuit.
>
> 2) Can anyone point me to a source of the CA-3161E/3162E IC's in the
> HDR-300A rotor? I know the original IC's are long discontinued so
> suggestions for suitable replacements would be appreciated. One is an A/D
> converter and the other is a 3-digit 7-segment LED driver.
>
> 3) I am planning on putting up a 48-foot Rohn-25 tilt-over tower that kinda
> fell in to my lap. I am concerned by the original Rohn documentation (circa
> 1964) that shows a 24x24x36-inch base for the tower, with *no* rebar cage
> indicated. Has that information been superceded? I am considering a
> 36x36x36-inch base with a 24x24-inch cage. Does that sound more reasonable?
>
> Finally: 4) On the tilt-over tower, I would like to use I-beams for the
> four anchor points, as indicated in K7LXC's book (excellent read, BTW).
> These would *not* be elevated but only about 6-inches above the ground. I
> wonder how deep the I-beams should go into the ground to be suitable anchor
> points? I am considering this to simplify anchor installation since I have a
> contractor neighbor who has augers up to 18-inch diameter and punching holes
> for the I-beams, possibly at a 45-degree angle, would be a simple matter.
>
> Any thoughts on these questions?
>
> Thanks and 73,
>
>
> --
> Jack, W6NF
> Silver Springs, NV
> DM09ji
>
--
Jack, W6NF
Silver Springs, NV
DM09ji
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