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2.2.7 TAS Coaxial Cable Fabrication
The TAS cables must have an attenuation of 2.0 ± 1.0 dB within the frequency
band of 1030-1090 MHZ. To ensure proper phase matching, each of the four
cables of a set must be of the same type. The lengths in each set of four must be
within 2.0" of each other. Color bands on the cable ends to match the antenna
color bands is suggested as an aid to hook up. Cables can be fabricated or pur-
chased from a cable vendor.
The nominal length of each set of four cables should be recorded for the
particular installation in the event a cable should require replacement. If
rework is required, a cable may be cut a maximum of 6".
The following defines the characteristics of the 50 ohm coaxial cable types that
can be used with the KA 815 Antenna. Connectors are also defined. All lengths
are defined as end to end. Any in-line or bulkhead penetrations must be evaluated
separately. It is the installing agency's responsibility to show airworthiness of the
fabricated cable assemblies.
When determining cable type and length make the following assumptions.
A.
Attenuation of each straight TNC male connector is 0.06 dB @ 1.03 GHz
(using a 030-00134-0000 RF Connector)
B.
Attenuation of each right angle TNC male connector is 0.07 dB @ 1.03
GHz (using a 030-00134-0001 RF Connector)
C.
Attenuation of each TNC female panel mount connector is 0.06 dB @
1.03 GHZ (using a 030-00101-0002 RF Connector)
D.
Attenuation of M17/128-RG 400 Coaxial Cable is 0.153 dB/ft @ 1.03 GHz
Using the above information, a RG 400 cable with a right angle TNC (antenna
end) and a straight TNC (KMH/KTA end) must be no longer than 225 Iinches long
as measured from end to end. If longer length is required, then a lower loss cable
with appropriate connectors must be selected. Refer to
and related notes..
Rev 3, August/2002
NOTE
10609I03.CDL
KMH 880/KTA 870
figures 2-8
through
Page 2-28
2-12
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