mike maghakian wrote:
I just "built" one with two upgraded filters and some
other bug fixes. it is so superior to a stock unit ! the
dual selectable filters are OUTSTANDING ! sold it for
$205 including nice external speaker

I am the only one that I am aware of on the planet to
build such an outstanding 394. my other great 394 project
was to build a portable capable 394. killer unit too !

got several more stock 394's coming so I can upgrade them
too.

it is FUN to upgrade them and see how I have improved
them !!!

Upgrading DX-394's has been sport for many years. A search of Usenet
postings in r.r.s in particular shows the first reported upgrade - the Kiwa
filter - in late 1995. There are some 6000 messages posted in Usenet that
refer to the DX-394 (some may be just in the signature) - another 2300 in
the RADIOSHACKDX394 Yahoo!Group. The late 90's saw a flurry of
improvements - most of the key ones - pioneered mainly by the legendary
Frank Cathell who seems to have moved on to astronomy and other interests. I
sparked another round starting in mid-2002, posted many to www.mods.dk and
consolidated everything I could find at the RADIOSHACKDX394 SIG and its
offspring, DX-394C, which concentrates on computer control conversions. Mike
Maghakian has stimulated a lot of discussion with his filter upgrades, here
in r.r.s. and the SIG. Another Mike, lowbander on ebay, has established a
solid reputation in doing cost-effective, intelligent upgrades, with over
500 DX-394 transactions on ebay.

In the last 5 months, DX-394's have sold on ebay for as little as $100 (a UK
auction last week) to as much as $275 for a modified one. You'll find my
average monthly price graph on the SIG website.

To the person who complained that his DX-394 is unstable in frequency: I
have 3 and they are all very stable - little apparent temperature drift and
quite solid through line voltage fluctuations.

Tom