Dual Channel Digital Receiver
Rio Rancho, NM
21
Antenna/Block Reference Table
The two AMJ whip antennas supplied with the receiver are factory cut to specific frequency blocks as shown in the
table below. A colored cap and label are used on blocks 20 through 26, and a black cap and label are used on the
other blocks to denote the frequency range of each model.
The chart is useful for fabricating an antenna from coaxial cable or other materials, or for identifying the frequency of
an antenna that is not marked. The lengths shown are specifically for the AMJ whip antenna with a SMA connector, as
determined by measurements with a network analyzer. The optimal length of the element in other designs will likely be
different than those shown in this table, but since the bandwidth is typically wider than the specified block, the exact
length is not critical for useful performance in whip, dipole and coaxial designs.
BLOCK
FREQUENCY CAP ANTENNA
RANGE COLOR WHIP LENGTH
A1
470 470.100 - 495.600 Black w/ Label 5.47” 141.2 mm
19 486.400 - 511.900 Black w/ Label 5.19” 133.9 mm
20 512.000 - 537.500 Black w/ Label 4.95” 126.2 mm
B1
21 537.600 - 563.100 Brown 4.73” 119.6 mm
22 563.200 - 588.700 Red 4.47” 113.8 mm
23 588.800 - 614.300 Orange 4.23” 108.5 mm
C1
24 614.400 - 639.900 Yellow w/Label 4.07” 103.4 mm
25 640.000 - 665.500 Green w/Label 3.87” 98.3 mm
26 665.600 - 691.100 Blue w/Label 3.68” 93.5 mm
941 941.525 - 959.825 Black w/Label 2.53” 64.3 mm
Note: Not all Lectrosonics products are built on all of the blocks covered in this chart.
32
470
944
33
31
21
22
23
24
25
26
27
28
29
30
20
19
915
779
Lay uncut antenna on this template and cut to length for the desired frequency block
Note: Check the scale of your printout. This line should be 6.00 inches long (152.4 mm).
Whip Length
Tr im the end of the color cap and slide the remaining sleeve over the whip - OR - Glue color cap onto the end
*Cut end of cap off
and slide over whip
Frequency Blocks
*Color cap
The hinged joint pivots in both directions
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