Clear-Com PTX-3 - Manual (Page 24)

Vitec Group Communications
PTX-3 UHF Digital Hybrid IFB Transmitter
1 - 1 8
Table 1-3: Frequency Blocks
The IFB transmitter antennas are color coded to indicate the frequency
block that they operate within. The length of the antenna varies with
the frequency block. The actual length of the antenna is not as critical
as it might appear in the table below. The usable bandwidth of the
detachable antenna is +/- 50 MHz from the block’s center frequency,
so it is acceptable to use an antenna from an adjacent block above or
below the operating frequency if some loss in range can be tolerated.
Part of block 23 is not used since it covers a 608 to 614 MHz band that
is allocated exclusively for use in radio astronomy.
BLOCK FREQUENCY
RANGE (MHZ)
ANTENNA
SLEEVE
COLOR
ANTENNA
WHIP LENGTH
21 537.600-563.100 Brown 4.74”
22 563.200-588.700 Red 4.48”
23 588.800-614.300 Orange 4.24”
24 614.400-639.900 Yellow 4.01”
25 640.000-665.500 Green 3.81”
26 665.600-691.100 Blue 3.62”
27 691.200-716.700 Violet (Pink) 3.46”
28 716.800-742.300 Grey 3.31”
29 742.400-767.900 White 3.18”
944 944.100-951.900 Black 2.74”