QTech Data Systems DATRAN Q80 Telemetry Radio - Manual (Page 13)

CONN CONN CONN CONNECTIONS ECTIONS ECTIONS ECTIONS
www.qtech.co.nz Tel 03 3663713
Radio Aerial Radio Aerial Radio Aerial Radio Aerial
The Maxon Radio Rx/Tx RF connector is located on the front panel of the Q80 Module. This connector is a 50
ohm BNC connector. The Q80 Module is not supplied with an aerial. QTech supply a number of suitable aerials;
please contact us for further details.
Suitable aerials include whips, folded dipoles and yagis. The aerial used must present 50 ohms to the Q80 Module
BNC RF connector at the operating frequency. The RF output of the Q80 Module is unbalanced referenced to
ground. Therefore folded dipoles and yagis will require a suitable unbalance to balanced impedance matching
balum.
Note All aerials supplied by QTech have required balums pre-installed.
QTech’s aerial range are generally supplied with 6m of coaxial cable “tail” is RG58. In applications where the
supplied 6 metre coaxial aerial cable is not suitable, site-specific cables can be constructed. These cable should
be constructed using good quality 50 ohm BNC connectors with crimped ferrules.
Note TV 75 ohm BNC connectors have a smaller centre pin. If used, these will cause an impedance mismatch
and not mate properly with the Q80 Module RF BNC connector.
The cable used to construct the aerial cable should be good quality RG58/U or RG213/U coaxial cable. For cable
lengths greater than 6 metres at UHF frequencies RG213/U coaxial cable should be used.
All connections to the coaxial cable should be sealed against moisture ingress and the aerial cable routed and
secured in a way so as to prevent mechanical damage and eliminate tight bends.
The completed aerial system should be checked for VSWR with a suitable VSWR meter. The VSWR should be
better than 1 to 1.5.