Section 171.311

14 CFR Ch. I (1-1-19 Edition)

(2) CW. The CW pulse transmissions
and the CW angle transmissions as may
be required in the signal format of any
function must have characteristics
such that the requirements of paragraph (d) of this section are met.
(d) Radio frequency signal spectrum.
The transmitted signal must be such
that during the transmission time, the
mean power density above a height of
600 meters (2000 feet) does not exceed
Section100.5 dBW/m 2 for angle guidance and
Section95.5 dBW/m 2 for data, as measured in
a 150 KHz bandwidth centered at a frequency of 840 KHz or more from the assigned frequency.
(e) Synchronization. Synchronization
between the azimuth and elevation
components is required and, in splitsite configurations, would normally be
accomplished by landline interconnections.
Synchronization
monitoring
must be provided to preclude function
overlap.

(f) Transmission rates. Angle guidance
and data signals must be transmitted
at the following average repetition
rates:
Function

Average
data rate
(Hertz)

Approach Azimuth .................................................
High Rate Approach Azimuth ................................
Approach Elevation ...............................................
Back Azimuth .........................................................
Basic Data .............................................................
Auxiliary Data ........................................................

13 Section0.5
Section1.5
39 Section1.5
6.5 Section0.25
(2)
(3)
1 39

1 The higher rate is recommended for azimuth scanning antennas with beamwidths greater than two degrees. It should
be noted that the time available in the signal format for additional functions is limited when the higher rate is used.
2 Refer to Table 8a.
3 Refer to Table 8c.

(g) Transmission sequences. Sequences
of angle transmissions which will generate the required repetition rates are
shown in Figures 2 and 3.

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