[R-390] DIY cabinet/shielding questions

Sun, 6 Jul 2003 17:07:48 -0400

All: I am late to review mail today, but is there anyone else besides me
that would like to see a picture of this?  It sounds like a real treat.

Dave WB4FUR

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Richard Biddle
Sent: Sunday, July 06, 2003 1:06 PM
To: [email protected]
Cc: [email protected]
Subject: Re: [R-390] DIY cabinet/shielding questions

Hello Adam,

I traded a cabinet-maker some repair work and had him build an oak veneer
3/4" plywood case that I designed for my R-390A/URR.  The cabinet is just
wide enough to fit a pair of rack slides on either side of the radio.  The
chassis does not touch the cabinet.  The cabinet is deep enough to contain a
4" AC fan and filter and there are ventilation slots cut near the front edge
on the top and bottom.  The fan draws outside air through a filter and
exhausts after flowing through the radio.  There is a two piece trim molding
around the edge of the front panel to hold the radio and cover the mounting
holes.  I used large furniture glides on the bottom so the cabinet is easy
to slide.  The back panel is hinged for cable access.  The fan and the radio
plug into a small outlet strip in the back of the cabinet.  I plug the thing
into a small variac with a AC line-meter I built for this purpose.  I can
remove the trim strips and slide the radio out of the cabinet for minor
things like zeroing the carrier level meter and setting the IF gain.    The
cabinet weighs in at about 20 pounds.

I do not have the top and bottom covers on the radio.  Originally I was
thinking of using copper sheeting or the copper paint used on the inside of
plastic computer monitor housings, but I don't seem to have any issues at
all with emitted or received EMI using an outside long-wire antenna.

As far a heat, I use IERC tube shields and there is a good bit of airflow
though the cabinet.  I measured temperatures at various points in the
chassis and was quite pleased with the results.

Good luck and 73 de Richard W5SRB

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