2-8
RLC-4 V1.79 Copyright © 1998 Link Communications Inc. 9/18/98
Description of Modes:
Mode 0: The receiver is effectively disabled; even if the carrier and/or PL is received, the
controller will ignore that receiver and will not key connected transmitters.
Mode 1: The controller will respond to the COR signal, allowing access with carrier. The PL
signal is ignored.
Mode 2: The controller will respond to the PL signal. The COR signal is totally ignored.
This mode may cause very long squelch tails since PL decoders are generally slow
to recognize when the PL tone goes away (see mode 3).
Mode 3: Both COR and PL must be active at the same time for the controller to respond to
the receiver. Repeaters that require PL usually use this mode because it eliminates
the long squelch tails often heard when using mode 2. Typically, when someone
keys a repeater with PL, the receiver’s COR signal will go active first. The
controller will ignore it for the moment. Perhaps 100 milliseconds later (the actual
time varies) the PL decoder will recognize the subaudible tone and will activate the
PL signal going to the controller. At that point the controller will see that the COR
and PL are both active and will key up any connected transmitters (subject to the
keyup delay filter and other factors). As long as both the COR and PL signals are
active, the controller will consider that receiver to be active. When that person
unkeys, the receiver’s squelch circuit will recognize the loss of carrier very quickly
(some squelch circuits are faster than others - ask about the RLC-MOT) and
deactivate the COR signal. The controller will see the change in the COR signal and
mute the audio right away, so you get a short squelch tail. The PL decoder will
eventually figure out that the subaudible tone went away and deactivate the PL
signal, perhaps 200 milliseconds later. The delay in sensing the loss of PL won’t
matter because the audio is already muted (unlike mode 2).
Mode 4: Either COR or PL will cause the controller to respond to the receiver. This mode is
useful if you want to allow access to a repeater without PL, but you have to set the
squelch relatively tight to keep noise from keying the repeater. As long as your
signal to the repeater is relatively strong, you can transmit without PL and you will
get short squelch tails just like in mode 1. If you are too far away and can’t get a
strong enough signal to the repeater to open the squelch, you can transmit a PL
tone. If your signal is strong enough for the PL decoder at the repeater to work,
you will be able to talk on the repeater, even if you can’t open the squelch (similar
to mode 2). Note that for this mode to work, the receiver must not mute the audio
going to the controller when the squelch is closed (you must use unsquelched
audio). When using this mode, you should transmit PL to the repeater only when
necessary, as whenever you use PL, you will get long squelch tails.
Mode 5: The controller considers the receiver to be active all of the time, regardless of the
COR and PL signals. This mode is useful for working with HF radios, with or
without all-mode squelch. If the HF radio doesn’t have squelch, or if it does but it is
set too tight and the signal keeps dropping out, you can select this mode to tell the
controller to treat it like it is always active while you are using it. You may want to
change the access mode to mode 0 when you are not using it, to keep it from timing
out.
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