Changeover was this time. I had an SM1971P with
auto on/off & space phone, it was IR. Remote he has now is from the
lower line sets. Although it has no keypad a remote with a keypad will
random access channels on these sets.
Remote receiver in set has amps then goes into the micro.
Just has sensitivity & trip point. Much better than tuning forks,
gives off a nice constant wave not damped off like the oldies.
So your keys, the dog or a train going by wont trigger it.
BTW All Zenith BATTERY ultras use same freqs. Tuning fork ones
are all over the place. For starters there was the on/off that was
white, silver, orange or blue all different IIRC.
MOST IR's also the same EXCEPT some non Zenith sourced sets
in the latter years.
Lets keep em running men!
73 Zeno
