Lectrosonics Inc UH400E ユーザーズマニュアル

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The transmitter will tune to any of 256 different frequen-

cies 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).

To determine a frequency from a block number:
25.6 × Block Number = Lowest freq. (MHz) in the block
Example:  25.6 x 24 = 614.400

To determine a block number from a frequency:
Freq. (MHz) divided by 25.6 = Block number 

(first two digits are the block number)
Example:  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.

It is handy to remember these formulas, in case you do 

not have a copy of the table.

Block Numbers and Freqeuncy Ranges

Block 470

470.100 - 495.600

Block 19

486.400 - 511.900

Block 20

512.000 - 537.500

Block 21

537.600 - 563.100

Block 22

563.200 - 588.700

Block 23 (lower)

588.8 00- 607.900

Block 23 (upper)

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

Part of block 23 (TV channel 37) is not available since it 

covers a 608 to 614 MHz band that is allocated for radio 

astronomy.

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