Zartek ZA-720, User Manual, Page: 13 / 15

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TROUBLESHOOTING
Problem Solution
No power.
y
The battery pack may be dead.
Recharge or replace the battery pack.
y
The battery pack may not be installed cor-
rectly. Remove the battery pack and install
it again.
Battery power dies shortly
after charging.
y
The battery pack life is finished.
Replace the battery pack with a new one.
Cannot talk to or hear
other members in your
group.
y
Check that the Antenna is fitted correctly.
y
Make sure you are using the same frequen-
cy and QT/DQT as the other members in
your group.
y
Other group members may be too far away.
Make sure you are within range of the other
transceivers.
Other voices (besides
group members) are pres-
ent on the channels.
y
Change the QT/DQT. Be sure to change
the tone on all transceivers in your group.
The transceiver continu-
ously rings
y
Channel programming is empty.
SPECIFICATION
General
Frequency range UHF 400-470MHz
Memory channels 16
Operation voltage 3.7V DC
Frequency stability ±2.5ppm
Operation temperature -20°C~+50°C
Mode of operation Simplex
Antenna impedance 50Ω
Transmitter
RF Power 0.5W / 2W
Maximum deviation (W/N) ≤ 5KHz / ≤ 2.5KHz
Spurious emission ≤ 7.5μW
Adjacent channel power ≤ -65dB / ≤ -60dB
SNR (W/N) ≥ -45dB / ≥ -40dB
QT/DQT (W/N) 0.7±0.1KHz / 0.4±0.1KHz
Modulation sensitivity 8-12mV
Transmission current ≥ 1.2A
Receiver
Sensitivity -122dBm (12dB SINAD)
Audio power 0.4W (8R Load)
Audio distortion ≤ 10%.
lntermediation(W/N) ≥ 65dB / ≥ 60dB
Adjacent channel selectivity (W/N) ≥ 65dB / ≥ 60dB
Clutter suppression ≥ 65dB
Receiver current ≤ 380mA