ARRL handbook:  I gotta get me somma that.

I used to have an old ARRL handbook, but it must be 1000+ years old by now,
doesn't seem to have it's cover and a number of chapters, and I think
somebody used the chapter on basics to wrap some fish heads in.  The ARRL
site is OK, but you have to be a member to get any technical info.  If
nothing else, ARRL is always good for the formula for making a coil out of
some wire and an oatmeal carton.  Anybody got one they'd part with?

--Lawrence




----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, May 27, 2002 3:58 AM
Subject: EMC Screening, was Re: [EE]: Sensitivity training for Engineers


> >I am thinking about a two-layer box, the outer layer
> >being copper screen, the inner layer being maybe steel,
> >rivetted together and using EMC tape all over the seams,
> >with an EMC gasket on the door.  I have seen such an
> >arrangement at a manufacturer that tests some kind of
> >RF equipment on their factory floor.
>
> This sounds like overkill for what you need. When I was involved with RF
the
> screened cages we had were made of wooden frame panels covered with copper
> gauze each side, but the two sides kept insulated from each other. The
> screened room was then made from a series of these panels, around a floor
> panel made the same way, and then covered with linoleum. The door occupied
a
> wall panel position, and the power was brought in through a filter box on
> the ceiling. Each panel had copper strips down the inner and outer joins
to
> ensure continuity of the screening over the join. The inner and outer
> screens were then joined at a single point by a piece of copper tubing
which
> formed the hole through which leads could be passed to external
> instrumentation etc, thereby forming a double Faraday cage.
>
> I saw one of these cages used to house a guy developing a heart monitor in
> the same room as another guy developing a 25 watt VHF transmitter, and was
> effective in stopping that level of power.
>
> For your use at 60kHz something similar should be quite adequate. Your
> receiver will not require much signal strength to find the tuning point.
> Initial tuning should be done by injecting a signal from a signal
generator,
> and if you need to tune up without physical injection, then a loop antenna
> on the signal generator should suffice. Check an ARRL or RSGB (the UK
> version of ARRL)  handbook for some of the "howto" on this.
>
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