Ramsey Electronics AM25 Manual de instrucciones descargar pdf (Pagina 18)

AR1 • 18

alignment. If you tune in such a signal on your receiver, remember that you

will have to increase the local oscillator frequency later in order to listen to air

traffic communications.

TUNING THE AR1

With the varactor Tuning Control capable of going across 10-15 MHz, and

with pilots and controllers talking so briefly, you will need to get used to tuning

your receiver! You'll find that ANY knob gives smoother tuning than the bare

control shaft, and that a "vernier" dial will make the procedure even easier -

but at the expense of being able to check up and down the band quickly,

which you might like to do if you're tracking the same airplane.

The AR1 is designed to let you explore the entire communications section of

the aviation band. If you become really interested only in being able to check

a certain frequency such as a nearby FAA control tower, or Unicom, it will be

helpful to mark that spot on a dial template such as is reproduced for your

convenience below. If you want a "fine tuning" control, see what you think of

the results you get from wiring a 25-ohm rheostat (as used for speaker

attenuation, such as Radio Shack 271-265) in series with the R1 tuning

control. There are other ways of changing the tuning characteristics of the

AR1, which will be familiar to radio hams and electronics experimenters, but

they are beyond the primary purpose of the receiver design and this

instruction manual.

The sample tuning dial templates below may be copied or adapted to provide

a simple "logging scale" for your receiver.

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Ramsey Electronics AM25 Manual de instrucciones Pagina 18