I am having a little problem selecting ADF frequencies with the ADF1 selector. Sometimes I am able to select the frequency on the ground, but once airborne, the selector is stuck on the 100.0 frequency and cannot be changed, not even the band selector will do the trick. I have no problem with the ADF2, only with number one.
Can someone give me a hint as to why this might be happening? I fly a lot south of the Rio Grande, where NDBs are still in use as part of airways and approach procedures.
Luis F. López