Frequency Agile Plug-On UHF Transmitter
Rio Rancho, NM
The UH400A transmitter will tune to any of 256 different
frequencies within a factory assigned block.
Two 16- position switches adjust the operating
frequency in 100 kHz steps yielding the 256 in a
block (16 x 16 = 256).
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, without
using the table:
685.500 divided by 25.6 = 26.77734375
The first two digits left of the decimal are the block num-
ber. In this case, 685.500 MHz falls within block 26.
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.
Frequency Blocks and Ranges
Operating Frequencies (MHz):
Block 21
537.600 - 563.100
Block 22
563.200 - 588.700
Block 23
588.8 00- 607.900;
614.100 - 614.300
Block 24
614.400 - 639.900
Block 25
640.000 - 665.500
Block 26
665.600 - 691.100
Block 27
691.200 - 716.700
Block 28
716.800 - 742.300
Block 29
742.400 - 767.900
0 1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 1
2
3
4
5
6
7
8
9
A
B
C
D
E
F