Hello,
Mike Hekrotte's email is heckro...@atlantis-bbs.com
He has many satisfied customers, including three Bay Area labs I work with.
Best regards,
Tom Cokenias
On Thu, 3 Oct 1996, Tony Fredriksson wrote:
>
> Hi,
>
> I met a person some time ago that claimed that he has measured
> significant site variation due to moisture absorption of wooden enclosures
> in the winter months.
>
> That person is Michael Heckrotte of Precision Research. He
> is an expert in the area of antenna calibration and
> site qualification and could probably give you a ballpark estimate
> of what type of variation is caused by wood moisture content, metal
> fasteners, etc..
>
> Assuming his business location has not moved, you can phone Mike
> at (408)253-6994 or fax him at (408)253-8011. His business address
> is 21987 McClellan Road, Cupertino, CA, 95014.
>
> I know of several people that use his consulting and calibration services
> and
> he comes highly recommended. I am not sure what are his consulting
> fees.
>
> Regards,
> tony_fredriks...@netpower.com
>
> ----------
> From: Gabriel_Roy
> To: Bill Franklin JR
> Cc: JTOLBERT; emc-pstc
> Subject: Re: O.A.T.S. enclosure
> Date: Thursday, October 03, 1996 5:01PM
>
> All the ones I have seen have used plastic bolts instead of metal nails,
> also
> the antenna mast was always located outdoors, outside the building (except
> for
> the ICL site which is underground in the UK).
>
> Gabriel Roy
> Hughes Network Systems
> MD
>
> To: JTOLBERT @ genicom.com @ SMTPGW; emc-pstc @ ieee.org @ SMTPGW
> cc:
> From: wfranklin @ bb-elec.com ("Bill Franklin JR") @ SMTPGW
> Date: 10/03/96 01:26:27 PM
> Subject: Re: O.A.T.S. enclosure
> SMTP Headers: Headers
>
> Hello,
>
> We built a 3 Meter site a few years back - maybe some of our
> experiences will help. We built it using all wood framing with nails
> no bigger than 16 penny (about 2" to 2 1/4"). We have two windows
> with plastic frames (to let in some light), a ridge vent that is made of
> cardboard (for ventilation), and a ridge pole that is made of plywood.
> The outer surface is plastic house siding. We used asphalt roof shingles.
>
> The thing looks like a ski slope with the peak at the maximum
> for the adjustable antenna. We had no problem staying within the
> 4 dB limits. We have passed every year so moisture must not be too
> much of a problem.
>
> We have a different problem in that the water table is very high here
> and we couldn't put a basement under our site, so we built up. Our
> ground plane is eight feet off the ground. It works fine for a 3
> Meter site but there is no way to move outside and use it as a 10
> Meter site. That also makes the building very very tall.
>
> Bill Franklin wfrank...@bb-elec.com
>
> >
> > Winter is coming and Hurricane Fran took my fabric-type Air Support
> > structure with him leaving my 10 meter "all-weather" Open Air Test Site as
> a
> > "fair-weather" site. :>(
> >
> > How about passing on your experiences regarding problems with any
> particular
> > types of PERMANENT building schemes to enclose RFI test sites. What
> (other
> > than the obvious conductive types) materials will erode my site
> attenuation?
> > Will I have to be concerned about things such as moisture content of the
> > framing?
> >
> > What types of designs yield a robust structure, yet allow for the 6 meter
> > high antenna clearance so the antenna can be moved from the 1m position to
>
> > the 10m position without dropping the mast?
> >
> > Thanks
> >
> > Joe
> > Joe Tolbert
> > GENICOM Corp.
> > Waynesboro, VA
> > jtolb...@genicom.com
> >
> >
>
>
>
