George
Glad you are happy with your Century 22 and welcome to one of my favorite
types of receiver... the DC receiver. Zero Beating is easy and an important
art
if done properly.
Basics of zero beating (K5BDZ version) a DC receiver and how to use the RIT:
1. If the receiver has a RIT (receiver incremental tuning) center the knob
of the RIT control - which sometimes has a center detent of the control.
Usually this places it in the position where the receive frequency is the same
as
the transmit frequency.
2. With your VFO knob, tune in a CW signal and you will note as you tune
across the signal it starts at a high pitch, then goes lower in pitch as you
tune
across it, and then starts going high in pitch again.
3. The lowest pitch of the CW signal is zero beat. From zero beat, tuning
one direction will tune the lower sideband of the signal, and tuning the other
direction tunes the upper sideband of the signal.
4. Now tune the signal to the lowest pitch and stop. Then use the RIT
control to fine tune across the signal. See how that works... like very fine
tuning of the VFO knob. With the Received signal at ZERO BEAT tune your RIT
both
directions (first one then the other) across Zero Beat until the CW signal is
pleasing to your ear. Make a note of the "clock settings" of the RIT control
on both upper and lower sidebands of the signal. This you'll now use as your
future starting point reference.
5. On a DC receiver, USUALLY the Zero Beat of the VFO is also the ZERO BEAT
of both receiver and transmit signals.
6. And on most DC receiver xcvrs, such as the Century 22, the RIT functions
in Receive mode only and does not control the transmit VFO.
7. With RIT control centered, tune in a CW signal and tune to Zero Beat.
Now tune your RIT to your favorite clock setting to receive the signal. Here's
the fun part.....! If some other signal is interfering with your received
signal, tune your CW station in on the OTHER sideband with your RIT. And now
operate normally.... you haven't changed the transmit signal, only your
received
signal. And you have a clearer receiption of your contact station by
listening on the other sideband with your DC receiver. (You can't do that with
a SSB
type receiver).
I love the "choice of sideband" option of DC receivers. It's kind like some
people prefer blondes others brunettes... whichever blows your skirt the
highest is your favorite!
Have fun. There's more you'll learn through experience... I tried to "over
simplify" above, but hope you understand the basics
Have a great time... the Century 22 is a great little rig!!! Now about that
CW filter control................ah well , another time.....
Bill K5BDZ
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|