Zartek COM8 User Manual - page 11
11
The radio will stop transmitting and sound a warning tone
when PTT is held over 60 seconds. You then need to release
PTT and press again for further transmission.
In VOX mode, the unit will stop transmitting and sound a
warning tone after continuous talk for 60 seconds. You can
re-activate VOX after the time-out. (Please refer to VOX
function for detailed VOX operation)
(7) TALK RANGE
The range will depend on the type of terrain that you are
communicating across.
The
Zartek COM8 uses the UHF (Ultra High Frequency) band
and will be subject to similar obstacle interference as cellular
phones. The radio works indoors as well as outdoors. Typical
rough estimate ranges for different terrains are:
Shopping centre 300m-1000m
Building 5-30 stories,
City centre & dense bush 500m-2km,
Residential & over water 2-4km,
Farmland 3-5km,
Top of mountain or building (elevated line-of-sight)
10-30km.
When you press the PTT talk button a signal is transmitted and the
signal floods the area in all sideway directions. The signal travels
in 3 different ways:
1) Penetration: The signal can go through materials such as wood,
plastic, cement and fabric. The denser the material or more built
up the environment the weaker the signal will become. The signal
cannot go through solid metal or very large solid land structures
such as a hill or mountain. Metal acts like a shield and that is why
the performance from the inside of a vehicle (car or 4x4) will be
less than outside.
2) Reflection: The signal cannot go through metal or very large
structures such as a hill or mountain, but it can bounce off (like a
mirror), go around and reflect in other directions as well. This