I concur it is a lousy 30m antenna, but I have worked 285 countries on 17m
with mine and 239 on 12m. It rocks on those bands. I've never had a "real"
17 or 12 meter antenna outside of the 402CD.
73,
Matt--K7BG
-----Original Message-----
From: towertalk-admin@contesting.com
[mailto:towertalk-admin@contesting.com]On Behalf Of Barry
Sent: Thursday, December 05, 2002 5:30 PM
To: Ken Kinyon - W7TS; towertalk@contesting.com
Subject: Re: [Towertalk] 40-2cd on 30 metres
Speaking from personal experience, the 402CD is a lousy antenna for
30m. It does work reasonably well on 12 and 17m though.
Barry, W2UP
On 5 Dec 2002 Ken Kinyon - W7TS wrote:
> Does anyone know what the radiation pattern of the 40-2CD looks like when
> used with a tuner on 30?
> If I bought one of the antenna modeling software programs, would I be able
> to plot this?
> regards,
> Ken W7TS
>
> -------------------
> Kenneth E. Kinyon
> 34 Princeton Circle
> Longmont, CO 80503-2106
> Voice: (303) 684-0037
> Fax: (303) 776-5088
> E-mail: W7TS@attbi.com
> W7TS@qsl.net
> W7TS@arrl.net
> ALPCA #8339
> ARRL-LM
> -------------------
>
> -----Original Message-----
> From: towertalk-admin@contesting.com
> [mailto:towertalk-admin@contesting.com]On Behalf Of EUGENE SMAR
> Sent: Thursday, December 05, 2002 16:10
> To: TexasRF@aol.com; stevek@jmr.com; n4gi@tampabay.rr.com
> Cc: towertalk@contesting.com
> Subject: Re: [Towertalk] New Rotator In Place; Mast Now Binds
>
>
> TT:
>
> To avoid (or minimize the likelihood of) binding with a thrust
bearing,
> you might want to look at a self-centering flange mount bearing assembly
> instead. Last year I purchased one of these monsters from a local bearing
> supply place. The bearing itself is somehow pressed into place in a cast
> iron flange. The cross section of the opening in the flange allows the
> bearing to pivot so that minor deviations from coaxial installation of the
> mast in the bearing (up to about 1.5 degrees, I think the specs say) can
be
> accommodated. That is, this type of bearing is more tolerant of slight
> misalignments of the mast/rotator/shelf below it than a strict TB3, TB4 or
> similar.
>
> This is the gizmo that I said I relubed last week during an annual
> inspection of the tower. I used marine grease which is water resistant
(It
> takes quite a bit of rubbing with a cloth to remove it from your hands.
The
> grease just laughs at soap and water.)
>
> The cast iron base for mine is 6-1/4 inches square and slightly over
an
> inch thick. It's a Fafnir SCJ series flange cartridges; the bearing
> assembly is a GYA-RRB (that's what the spec sheet says.) I bought it from
> Applied Industrial Technologies (www.appliedindustrial.com ). Sorry, but
> their spec sheet is faxed and I can't read their model number.
>
> The best thing about this device is it was a few $ less than a TB3 -
> around $72 in DC area. I had to get the model next in size above a
nominal
> 2 inch ID. The 2 inch OD CM mast I bought was too large for the first
> bearing I had. I shimmed out the small difference with a piece of
stainless
> sheet.
>
> IMHO, if you're planning on using a Rohn flat top, this would very
> easily fit and work quite well.
>
> 73 de
> Gene Smar AD3F
>
> -----Original Message-----
> From: TexasRF@aol.com <TexasRF@aol.com>
> To: stevek@jmr.com <stevek@jmr.com>; n4gi@tampabay.rr.com
> <n4gi@tampabay.rr.com>
> Cc: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
> Date: Thursday, December 05, 2002 5:26 PM
> Subject: Re: [Towertalk] New Rotator In Place; Mast Now Binds
>
>
> >Here is the straight skinny on 25G top sections:
> >
> >Several years ago (ten or more) Rohn redesigned the 25AG2 and 25AG3 top
> >sections to use a 2.25 inch o.d. 14 gauge wall top support tube. After
> >galvanizing these top sections will fit with a 2 inch o.d. mast (also
> >galvanized) and have a clearance of about .050 inch left over.
> >
> >Before the redesign a 1.9 inch o.d. mast would fit ok but a 2 inch o.d.
> mast
> >would bind in the top tube.
> >
> >As a side note, Rohn also redesigned the TB3 thrust bearing to fit the 2
> inch
> >o.d. masts instead of the older 1.9 inch o.d. masts.
> >
> >I just tested a new 2 inch o.d. mast in a 25AG2 top section and the fit
is
> >just right for free rotation of the mast. The clearance is close enough
> >though that without shims in a Ham 4 or T2X rotator there will be binding
> of
> >the mast. Also, the associated AS25G rotator plate is not exactly a
> precision
> >built piece of equipment and some "adjustment" of the mounting ears
might
> be
> >required to center the rotator mast clamp with the support tube.
> Aditionally
> >the 25AG2 or 25AG3 top section suport tube can be out of plumb just
enough
> to
> >cause binding; they are not exactly precise either. Adjustments of the
> >rotator plate can accomodate all of these errors but some patience might
be
> >needed.
> >
> >73 de Gerald Williamson/K5GW/Texas Towers
> >
> >
> >--- StripMime Report -- processed MIME parts ---
> >multipart/alternative
> > text/plain (text body -- kept)
> > text/html
> >---
> >_______________________________________________
> >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
> >Towertalk@contesting.com
> >http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
> 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
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> _______________________________________________
> 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
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA Frankford Radio Club
_______________________________________________
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
Towertalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
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