Also, be aware that the "Extender" is somewhat different from the typical
noise blanker (at least in RCA units), in that these actually have a
SEPERATE reciever, that can be tuned to a nearby (but not necessarly the
same frequency) that you are trying to eliminate noise on. The output of
this is used to control a preamp on the frequency that you are operateing
on. This has a major advantage over the typical noise blanker, in that , a
strong nearby signal won't overload the extender , if it is aligned 2, or
3 megs away from the frequency range you want to operate (unlike in a
transciever, which operats at the IF frequency ). As a side note, these
make great noise blankers for 6 meters, and are virtually overload proof.
Been there, done that! Jim NN7K



Richard wrote:...
Crazy George wrote:
"---do a bibliographic search of Engineering Index, or Scientific
Abstracts, or whatever that school has access to."

Excellent advice from George. Motorola`s Extender usually included a
switch on the radio control head to enable or defeat Extender operation.
The only reason I can think of to defeat Extender operation is to
demonstrate its effectiveness, which can be compelling.

The Extender works early and often to put a hole in the radio`s response
before adverse effects are generated within. The holes rarely detract
significantly from the signal.

Also look for Motorola TEK 21 Pulse Generator instructions. It is a
hand-held, battery-operated, zener diode noise maker used to optimize
Extender performance in the radio. The TEK 21 saves overheating a car
engine just to make ignition noise pulses to obliterate while tweaking
the Extender circuit and the the radio`s response.

Best regards, Richard Harrison, KB5WZI