|AN-100 from below|
My preference was the AN-100, since I believed that the foot could be opened by a bottom plate, it seemed better suited for modifications. And, the dear reader may have a guess... I was guessing correctly. Underneath 4 rubber-foam pads, 4 screws allow access to the inside of the AN-100's stand.
|screws underneath pads|
Now, that was a simple one, no solder molten.
To drop the frequency even lower, solder needs to be molten. I figure a high quality, e.g. polystyrene, 47pF capacitor parallel to the tuning capacitor will do the trick.
The most upper resonance frequency is now 1330kHz.
The combination AN-100 & ATS-909 let me presently listen regular CW-QSOs.
|inside the foot|
- a preamp
- an I/Q-SDR receiver
- a (subharmonic) grabber receiver w/ a USB sound-device, USB powered