[Premium-Rx] WJ-8711A-3 Strange behavior

[David Allaway]

> QUESTIONS:
> 1- What are buttons "A" and "B" for? (see fig. 1)
 
According to the specifications, they insert an "A" or "B", plus the operating frequency, into the RS-232 output. This is for direction finding applications. My guess is that this is intended to control a remote antenna switch.
 
> 2- Detection Mode button physically not centered on the front panel? (see 
> fig. 2)
 
It looks as though they planned to add a fourth button (like the row above), perhaps for FSK, but decided to implement this in firmware instead. 
 
Dave N2XB