Degen DE31 'portable' Shortwave "Active" Loop Antenna
 

pure wrote :
[...]
2 - the reception on shortwave is greatly improved, no doubt, with the
de31 and degen 1102, it's just that to obtain that great leap in
quality, the plug has to be introduced ONLY HALF WAY into the
of the degen 1102 external antenna jack!!! If I do push it completely
inside, as it is supposed to be, the degen immediately loses all
benefits of the external de31 antenna, even worse than using the whip
withdrawn completely(.

I can experience the same thing with my (working) KA31. I suspect you
connect then the ground circuit of the antenna to some point of the
radio, then using the DE31 circuitry as a basic reel antenna ?

[...]

Just my 2 cents...

Charly