"Richard Clark" wrote in message
...
On Fri, 29 Apr 2005 20:27:51 -0700, "Ed Price"
wrote:

I had considerable problems with
resonances, starting around 7 MHz and continuing through about 150 MHz,
associated with the chamber XYZ dimensions.

Hi Ed,

When I was in the Navy, my buddy had, in his former life, been a pipe
organ technician (the old fashion type, not the Hammond home organ
type). He had worked in the really large Pizza 'n' Pipes types of
concessions up and down the Pacific coast, and in the classic theaters
of the 30s vintage (Paramounts, Pantages, Orpheums, etc.). He related
how those venues made sure that when constructed, no two walls met at
90° nor were parallel so as to break up resonances.

73's
Richard Clark, KB7QHC


Umm, yes. Unfortunately, the suppliers of modular shielded enclosures are
rigorously orthogonal guys! g

--
Ed
WB6WSN
El Cajon, CA USA

--
J. Mc Laughlin; Michigan U.S.A.
Home:



.. The Empire was used
with the NF-105 receiver,

That was the one I used, now you mention it I remember the model number
as
the NF-105


So you're older than dirt too? g


--
Ed
WB6WSN
El Cajon, CA USA


I too used a NF-105 with plug-in modules and a gas generator to run
propagation surveys in the hills of West Va. a very long time ago. I
received a first class education about real propagation and comparisons with
predictions. Sure wish I had had a computer.
Since we had a government station wagon (would drop off the generator,
drive ahead to get away from the noise, and take measurements) we were
concerned that the indigenous population might see us as "revenuers." We
never went up a road that had an advertisement for honey.
73 Mac - not quite as old as dirt N8TT