[SCCC] SCCC Digest, Vol 129, Issue 7

HL Serra hlserra at gmail.com
Sun Sep 15 13:46:27 EDT 2013 

Rotator mechanical noise soundproofing:

I agree with Tim. Build a plywood baffle box around it. Go to West Marine
and buy some of the thick, engine box insulation they make for sailboat
engines. It comes in rolls and has an egg-crate acoustic foam layer, a thin
lead layer and a reflective Mylar layer. I used this to build a baffle box
for a noisy two-unit, 4-fan, high-current switching power supply. It works
so well I have to walk out onto the porch to tell if it is on or off.

73, Larry N6NC


On Sun, Sep 15, 2013 at 4:00 PM, <sccc-request at contesting.com> wrote:

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> Today's Topics:
>
>    1. Antenna rotor insulation (Tim Goodrich)
>    2. Re: Antenna rotor insulation (Timothy Coker)
>    3. NA Sprint CW W4EF HP (Michael Tope)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 14 Sep 2013 17:39:15 -0700
> From: "Tim Goodrich" <tim at timgoodrich.com>
> To: <sccc at contesting.com>
> Subject: [SCCC] Antenna rotor insulation
> Message-ID: <061301ceb1ac$020cfd20$0626f760$@com>
> Content-Type: text/plain;       charset="us-ascii"
>
> Hi All,
>
> I just upgraded to a 55' tower with a hexbeam- much better than the
> magnetic
> loop I was restricted to while in a condo. I'm in a really quiet
> neighborhood and am looking for a way to reduce the noise coming from the
> rotor. Has anyone ever done or seen some sound proofing added around a
> rotor? Any ideas would be appreciated.
>
>
>
> BTW, the rotor is on a US Tower MARB base, so it's off the ground a bit and
> at the bottom of a tubular tower.
>
>
>
> Thanks,
>
> Tim
>
> K6TW
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 14 Sep 2013 17:46:57 -0700
> From: Timothy Coker <n6win73 at gmail.com>
> To: Tim Goodrich <tim at timgoodrich.com>
> Cc: SCCC <sccc at contesting.com>
> Subject: Re: [SCCC] Antenna rotor insulation
> Message-ID:
>         <CAJv-=7=70E02RriZDNCMPg5HtE9oz=
> Xhc_G+saF2tSOVM0xg_w at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I left the same tower at my dad's qth from my college days. I am familiar
> with what your working with. What about using plywood and attaching some
> sound proofing mats? Thinking something that would muffle and port the
> sound to a desired direction? Same sort of things guys do to quiet down and
> redirect sound from generators...
>
> Also, FB on the tower upgrade.
>
> 73,
>
> Tim / N6WIN
> On Sep 14, 2013 5:40 PM, "Tim Goodrich" <tim at timgoodrich.com> wrote:
>
> > Hi All,
> >
> > I just upgraded to a 55' tower with a hexbeam- much better than the
> > magnetic
> > loop I was restricted to while in a condo. I'm in a really quiet
> > neighborhood and am looking for a way to reduce the noise coming from the
> > rotor. Has anyone ever done or seen some sound proofing added around a
> > rotor? Any ideas would be appreciated.
> >
> >
> >
> > BTW, the rotor is on a US Tower MARB base, so it's off the ground a bit
> and
> > at the bottom of a tubular tower.
> >
> >
> >
> > Thanks,
> >
> > Tim
> >
> > K6TW
> >
> > _______________________________________________
> > SCCC mailing list
> > SCCC at contesting.com
> > http://lists.contesting.com/mailman/listinfo/sccc
> >
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 15 Sep 2013 08:16:25 -0700
> From: Michael Tope <W4EF at dellroy.com>
> To: sccc at contesting.com
> Subject: [SCCC] NA Sprint CW W4EF HP
> Message-ID: <5235CF49.4070204 at dellroy.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>                      NA Sprint CW Contest - September
>
> Call: W4EF
> Operator(s): W4EF
> Station: W4EF
>
> Class: Single Op HP
> QTH: CA
> Operating Time (hrs): 4:00
>
> Summary:
>   Band  QSOs  Op Time
> ---------------------
>     80:   67   00:56
>     40:   99   01:20
>     20:  118   01:44
> ---------------------
> Total:  284    Mults = 44  Total Score = 12,496
>
> Club: Southern California Contest Club
>
> Rig : FT1000MP MKV + Alpha 87A
>
> Antennas :  20M/40M  Parallel Inverted-Vs w/common feed point @ 37'
>              80M   57' vertical with ~1 mile of radials
>
> Soapbox :
>
> I had some time off work, so I lowered my AB-577 earlier in the week to
> swap out my Ham IV rotator with the bad direction potentiometer for a
> working unit, repair and upgrade my 3-band Spiderbeam to a 5-band
> Spiderbeam, and to switch the uninsulated steel guy wires on my AB-577 over
> to Phillystran.
>
> Come Saturday morning after working all night Friday (it is much easier
> working at night in the desert so as to avoid the 100+ degree heat), it
> became clear that if I wanted the Spiderbeam back up in the air for the CW
> Sprint, I would not have time to install the 12/17 meter upgrade kit, nor
> would I have time to rest at all before the contest. I really wanted to
> upgrade the Spiderbeam and go over the existing hardware with a fine tooth
> comb, since work looks like it will be keeping my very busy for the next
> few months, so I opted leave the Spiderbeam on the ground until Sunday and
> spend Saturday resting up a bit. I
> figured my 20 meter numbers would be about the same either way (i.e.
> exhausted operator with 3 element yagi would be about equal to a rested
> operator with an inverted-V).
>
> As it turned out, I did okay on 20 meters despite the low inverted-V. It
> was not a great showing on my part, but I managed to keep a pretty
> consistent pace through out the contest (hourly rates were 72, 73, 67, 72).
> I thought I might even break 300 Qs, but 80 turned out to be less
> productive than I expected.
>
> On the multiplier side, the ones I heard but missed were AR and VI. I
> heard K5GO in AR early on, but never did connect with him or any other
> station in AR. Also heard VI several times (including on 80 meters), but
> never was in phase with him. It was a thrill to work KO7X/m (twice), but a
> bit of a disappointment to discover that he was in California instead of
> Wyoming. I never heard the XE station that others reported working.
>
> This was my first contest using the Alpha 87A. It was nice to be able to
> make quick band changes without any need to re-tune the amplifier. I
> probably should have made more use of this capability and switched from 20
> to 40 earlier than I did, but 20 kept producing so I didn't bother. On
> Sunday and Monday I finished getting the upgraded Spiderbeam back up in the
> air with the new insulated guys along with the new rotator (the one that
> knows which was it is pointed). Hopefully (knock on wood), all this stuff
> will still be working come February. Cu all then.
>
> 73, Mike W4EF...........
>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> ------------------------------
>
> End of SCCC Digest, Vol 129, Issue 7
> ************************************
>

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