User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Trig Avionics Limited Page 23
from too-tight bends or from momentary kinking during installation.
Once kinked, these cables do not return to full performance when
straightened.
The following table is a guide to the maximum usable lengths of some common
cable types. Actual cable loss varies between manufacturers, there are many
variants, and the table is therefore based on typical data. Use it as a guide only
and refer to the manufacturer’s data sheet for your specific chosen cable for
accurate values.
Max
Length
in
Metres
Max
Length
in Feet
Insertion
Loss
dB/metre at
1090MHz
MIL-C-17
Cables
Electronic
Cable
Specialists
Type
SSB
Electronic
2.54
8’ 4”
0.59
M17/128
(RG400)
3.16
10’ 4”
0.47
3C142B
3.81
12’ 6”
0.39
M17/112
(RG304)
4.50
14’ 9”
0.33
Aircell 5
5.25
17’ 3”
0.29
M17/127
(RG393)
311601
6.42
21’ 1”
0.23
311501
6.81
22’ 4”
0.22
Aircell 7
8.22
26’ 11”
0.18
311201
12.59
41’ 3”
0.12
310801
Contact Electronic Cable Specialists on [phone] or at
www.ecsdirect.com for their data sheets. Contact SSB-Electronic GmbH on
[phone] or at www.ssb.de for their data sheets.
When routing the cable, ensure that you: