Hi Eric,

I took your advice and put the comparison files on my web site. I made about
a dozen more comparison recordings originally, but kept these as the main
examples. Note that the recording level on the R-75 clips are somewhat low;
bump up the volume on your MP3 player to hear the audio better.

All recordings were done with the receivers' mode (USB), bandwidth (3.3 or 4
kHz), and AGC (fast) matched as closely as possible.

1) All India Radio, Bangalore 9425 kHz, just past fade-in.

http://www.guyatkins.com/files/r75_9425khz.mp3 audio's there, but poor.

http://www.guyatkins.com/files/RX340_9425khz.mp3 mostly noise.


2) SABC Meyerton, 3320 kHz, during a poor propagation evening, an hour or so
past Meyerton SR.

http://www.guyatkins.com/files/r75_3320khz.mp3 weak signal audio.

http://www.guyatkins.com/files/ra6790gm_3320khz.mp3 also weak, but
slightly better on the Racal.

http://www.guyatkins.com/files/RX340_3320khz.mp3 mostly noise.


3) Example of Carl Moreschi N4PY's RX-340 front end modification. Mod is
switched in and out on a weaker MW station that's 10 kHz away from a
powerful
local (I forget the call letters of the weak station, but it was in Nampa,
Idaho). The poorer/weaker portions of audio are the RX-340 "barefoot"
without the
mod, presumably indicating desensing/RF blocking occurring.

http://www.guyatkins.com/files/RX340_Mod.mp3


Guy Atkins
Puyallup, WA USA



"Eric F. Richards" wrote in message
...
SNIP
Hi, Guy,
As for your MP3s... I'd be very interested in hearing them! Perhaps,
for others following this discussion, you can put them on a web page?
If not, with your permission (and size permitting), I can do so.
SNIP