The Network List
Manpack Transceiver 2110 series Reference Manual 145
Call Detect Time
The Call Detect Time setting applies to all types of networks. The call detect time is the
length of time during scanning that the transceiver pauses on each channel in order to
detect an incoming call. The call detect time is the inverse of the scan rate. For example,
a call detect time of 0.2 s is equivalent to a scan rate of 5 channels/s. Codan HF
transceivers can scan at up to 8 channels/s in an ALE/CALM network, hence the call
detect time of 0.12 s.
You can set the call detect time to <default> or to a specific value. The default call
detect time for each call system is shown in Table 23.
There should be no requirement to change the call detect time from the default value. If
you change the call detect time or change the number of channels in the network, you
must recalculate the nominal preamble time, that is, the call detect time multiplied by the
number of channels in the network (see page 147, Nominal Preamble).
Sounding Interval
The Sounding Interval setting applies to ALE/CALM networks only. The sounding
interval is the frequency with which the transceiver sends sounding signals to other
stations to assess the quality of the channels in the network.
The recommended value is 5 hours. The longer the value, the longer the transceiver takes
to update its channel quality information. If the value is set to 5 hours, the transceiver
takes 5 days to completely update channel quality information. Longer sounding
intervals decrease the interruptions on network channels.
Table 23: Default call detect times
Call system Default call detect time
on each channel
(s)
Codan Selcall 0.3
Open Selcall 0.3
ALE/CALM 0.12
Voice Only 0.5
NOTE You cannot set a call detect time that is lower than the default value.
CAUTION
You should be aware of any restrictions placed on call detect times in your
transceiver’s networks when it is used with an HF Data Modem 3012. For
more information see the HF Data Modem 3012 Reference Manual.
NOTE
Link quality information is also updated each time a call is made or
received.