Hi Mike,

The RX-340 seller is a very good friend of mine since 1986, and he and I
both experimented with AC inverters at various times. The verdict:
thumbs-down, due to RFI.

My last attempt was with powering a modded Racal RA6790/GM with a "pure
sine" inverter for DC-only DXpedition purposes. The AC supplied by the
inverter to the radio was indeed very clean, but the case & cable radiated
hash to the MW and HF bands despite all my attempts to shield and choke off
the noise.

I used large torroidal cores on the input and output leads of the inverter
(a mod I did inside the inverter's case). I placed the pure sine inverter
inside a galvanized steel container, moved it 50 feet away from my
DXpedition setup, and also grounded the case with two 4-foot ground rods. I
was also using a "medical-industrial grade" shielded 3-wire AC cable between
the shielded inverter and the receiver.

All of these attempts only served to put a small dent in the noise that was
audible on the bands, in the RF-quiet DXpedition setting.

I looked into using linear voltage regulators to supply all the different DC
voltages the RA6790/GM requires, and using 24 VDC as the input to the
regulators. If I recall correctly, it would have taken 7 or 8 positive and
negative supplies of various voltages. I'm convinced this would have worked,
but I didn't want to do further mods to the receiver... too risky in my
opinion.

This hassle with powering the Racal on DXpeditions led me to switch to a
ICOM IC-756Pro, which was my first taste of what a good DSP receiver can do.
I fell in love with the spectrum display and filters, and then moved on to a
SDR-1000.

My friend selling the RX-340 and I both find the real-time, high resolution
displays of the Winradios and the Flex-Radio product to be highly useful for
trans-Pacific (TP) medium wave DXing. The resolution of my SDR-1000's
display is as fine as 16 Hz, and can "zoom" out as far as 200 kHz, given the
correct sound card that supports 192 kHz sampling. My current external sound
card is the Presonus Firebox, which supports half that total amount (96 kHz
of spectrum display in real time). More useful than the widest view, though,
is a display of around 20 kHz total...this is the setting I use most of the
time while DXing.

73,

Guy Atkins
Puyallup, WA USA
www.sdr-1000.blogspot.com



"Mike" wrote in message
. ..
Hi John...

For the sake of discussion and curiosity....

Have you ever owned or used one of these radios?

He really has a nice setup and should probably keep it. If the radio is AC
only, why not buy a good quality inverter for it. He already has it setup
in
a portable case.