CS v.2.0 Outstanding Items. DCS Manufacturers Meeting June 13, 2007 Peter Woolner Noblis [email protected] 703-610-1724. Antenna Info on Nameplate. The change to section 1.3 d) discussed at Asheville has been accepted The revised text is:
Approved antenna gain, polarization, and type for use with this DCPRS
(e.g. 11 dBi RHCP Yagi)
Positive overshoot is not relevant to turn-on time
Undershoot must be less than 1 dB
Rise time must be 5.0 mS maximum to -1 dB from average
Time to 250 or 500 mS
At the end of the message after the EOT, an additional 32 zero (0) data bits shall be input to the encoder to flush the encoder and decoder. This shall result in 16 symbol periods in which zero phase is transmitted, after which the carrier power shall be turned off. The turn-off transition shall not start until the end of the 16th symbol period and shall be a maximum of 15 milliseconds in duration, in which time the power shall be reduced by at least 50 dB.
The phase noise of the unmodulated carrier shall be equal to, or less than 2.0 degrees RMS, when integrated over the range 2 Hz to 150 Hz for 300 bps, and 6 Hz to 600 Hz for 1200 bps. Certification testing may use any frequency range that includes either or both of these ranges, e.g. a measurement for 2 Hz to 1000 Hz could show compliance for both data rates. The 2.0 degree limit shall be met under any combination of operational conditions.
Reference level is peak of theoretical curve shape
Each out-of-band emission limit shall be measured from the peak of the theoretical curve to the highest peak in the out-of-band frequency range
This is a noise-like signal
Use enough averaging to locate the peak of the theoretical curve
or may also contain a CW component
The modulation sidelobes may be noise-like