Comtech EF Data HPCST-5000 - Manual (Page 37)

High-Power TWTA Satellite Terminals Introduction
Rev. 1 1-21
1.4.3.2 Transmit
The transmit performance is the summation of the effects of the RFT and TWTA units.
Note: Intervening cable losses due to installation variables must be considered when
comparing the performance data listed in Table 1-13 through Table 1-16.
Table 1-13. HPCST-5000/-7000 Transmit Characteristics
Transmit Characteristics
Frequency Range:
RFT-500
RFT-700 5.845 to 6.425 GHz, in 2.5 MHz steps
6.725 to 7.025 GHz, in 2.5 MHz steps
System Gain:
140W System:
at 6 dB backoff, small signal
at saturated pwr, large signal
350W System:
at 6 dB backoff, small signal
at saturated pwr, large signal
73 dB min.
78 dB min.
77 dB min.
83 dB min.
TX IF Input Level Range -35 to -25 dBm typical
Output Power at saturation:
170W TWT
400W TWT 140W
350W
TX IF Input Bandwidth at -1 dB 70 ± 18 MHz
Gain: Stability (over temp.)
Flatness
Variation
+1.5 dB (matched RFT with TWTA)
± 1.5 dB/36 MHz
+2.0 dB max.
Group Delay (any 36 MHz):
Linear
Parabolic
Ripple
IESS-309, Figure 3, < 10ns
0.28 ns/MHz
0.15 ns/MHz
2
< 5 ns P-P
TX Freq. Stability ± 1 x 10 -8
TX Synthesizer Lock-up time < 1 second
Spurious (not inter-mods):
at 6 dB backoff
with carrier off
Intermod Spurious with two equal carriers
Harmonic (out of band)
IESS-309, Paragraph 3.2.1
-40 dBc min. (
≤ 2.048 MHz inform. rate)
-50 dBc min. (> 2.048 MHz inform. rate)
-24 dBm/4 kHz max. (anywhere in satellite band)
-22 dBc at 6 dB backoff
-60 dBc at 6 dB backoff
TX Phase Noise(SSB) at:
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
(Maximum)
-30 dBc/Hz
-60 dBc/Hz
-70 dBc/Hz
-75 dBc/Hz
-80 dBc/Hz