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Figure 2—Hams in the coverage area of the K3KMO repeater also hear signals from distant machines. To cure the annoying
problem, the trustee of K3KMO switches on a 88.5-Hz tone encoder on the output of the machine. Whenever the K3KMO
repeater is up, the tone is transmitted as well. Anyone who owns a rig equipped with a CTCSS decoder can set it to
respond to the 88.5-Hz tone. Now they only hear transmissions from the K3KMO repeater!
Have You Decided?
Is there a CTCSS decoder in your future? If your favorite repeater is having difficulty with another overlapping system, the
repeater trustee may install a CTCSS system to help cure the problem. If your radio can't decode the tone, you won't share the
benefit. As you've seen, a CTCSS decoder is also a valuable asset if you're a busy person who doesn't want to be bothered by
random chitchat. A CTCSS decoder might allow you to keep the radio "noise" at a tolerable level, while still providing a way for your
buddies to reach you.
Ken Collier, KO6UX, 7510 Rudell Rd, Corona, CA 91719, e-mail: kjcollier@juno.com
December QST: Decoding the Secrets of CTCSS - Page 4
ARRL 1996 QST/QEX/NCJ CD C
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