Operation and Installation Manual
KRT2 VHF-Communication Transceiver
Doc.-No: KRT2.A-MAN.en
Rev. 0101
Page
26
4.5 DUAL
watch
Because the communication transceiver KRT2 contains only one receiver, DUAL watch is achieved
by alternating between the Active and Standby frequencies.
The DUAL button activates and deactivates the dual watch function. Deactivation also can take place
by pressing either the FREQ or MEMORY buttons.
The frequencies to be watched should be selected prior to the DUAL watch selection.
The frequencies to be used must be selected before using dual watch and the squelch level SQ must
be set to 02 or more in order to eliminate noise. Scanning Frequencies is only possible when differen-
tiating between radio noise and radio transmissions.
There must be radio noise suppression in order to recognize reception. The
squelch level SQ must be set to 02 or higher.
When DUAL watch is activated, “DUAL“ is displayed on the lowest line. The pointer next to the DUAL
display indicates the frequency on which there is reception.
The Active frequency always has priority and the receiver remains on the active frequency as long as
there is reception on this frequency.
When there is no reception on both the Active frequency and the Standby frequency the receiver
scans both frequencies 5 times per second.
When reception is detected on the Active frequency the reception on the standby frequency is inter-
rupted until the end of the reception.
When a reception is detected on the Standby frequency the receiver stays on the Standby frequency,
however it switches to the Active frequency every 2 seconds for a duration of 0.3 seconds. If a signal
is detected on the active frequency the reception will be switch to that frequency.
The pointer next to the DUAL display indicates on which frequency there is reception.
Figure 4: KRT2 active & standby frequencies
Standby and Active frequencies can be exchanged when in the DUAL mode. The transmitter operates
on the Active frequency only.
