Bunia3 wrote:

does anyone know the specific mods to improve sensitivity using just the whip?

i have three of these radios and the sensitivity is porr below 7 mhz--but
increases significantly above about 15 mhz..??filters somewhere???

The best way to find the whip sensitivity mod's for the ATS-909 or
DX-398 is to do a Google-Groups search for this group. Look for posts
during the years 2000-2003. That should cover the time when these mod's
were being discussed the most. I did two whip sensitivity mod's for my
DX-398. I removed resistor R-43 and I made a balun transformer on a
small ferrite core which is installed (internally) between the whip and
it's connection point on the PC board. These mod's greatly increased the
whip sensitivity. It's now comparable to the Sony-2010, which is very
sensitive on the whip antenna.


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