Frequency Blocks And Ranges - Lectrosonics T1 IFB Instruction Manual

T1

Frequency Blocks and Ranges

The table below lists the factory designated frequency
ranges available for the T1 IFB Transmitter.
Each T1 transmitter is built to cover a pre-selected
range of frequencies (a "block") as shown below. The
transmitter will tune to any of 256 different frequencies
within this factory assigned block.
The block number is determined by this formula:
25.6 × Freq. (MHz) = Lowest freq. (MHz) in
the block
To determine a block number from a frequency:
Freq. (MHz) divided by 25.6 = Block number
It is handy to remember these formulas, in case you do
not have a copy of the table. For example, suppose you
need to know which block covers 685.500 MHz, which is
in the middle of the Block 26 frequency range.
BLOCK
21
22
23
24
25
26
27
28
29
30
31
32
33
12
FREQUENCY
RANGE
537.600 - 563.100
563.200 - 588.700
588.800 - 614.300
614.400 - 639.900
640.000 - 665.500
665.600 - 691.100
691.200 - 716.700
716.800 - 742.300
742.400 - 767.900
768.000 - 793.500
793.600 - 819.100
819.200 - 844.700
844.800 - 865.000
685.500 divided by 25.6 = 26.77734375
The first two digits left of the decimal are the block
number. In this case, 685.500 MHz falls within block
26.
The T1 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 illegal for use with wireless micro-
phones.
ANT SLEEVE
COLOR
Brown
Red
Orange
Yellow
Green
Blue
Violet (Pink)
Grey
White
Black
Black
Black
Black
ANTENNA
WHIP LENGTH
4.74"
4.48"
4.24"
4.01"
3.81"
3.62"
3.46"
3.31"
3.18"
3.08" (Export Only)
2.99" (Export Only)
2.92" (Export Only)
2.87" (Export Only)
LECTROSONICS, INC.