TIMTER™ Multi
-mode Dual
Telemetry Transmitter
84
Quasonix, Inc.
BER
Maximum Eb/N0 (dB)
PCM/FM, Tier 0
SOQPSK-TG, Tier I
MULTI-h CPM, Tier II
10-5
9.5
12.5
14.3
10-6
10.5
14.0
15.3
6.7 Modulated RF Power Spectrum
The transmitter’s modulated spectrum complies with the IRIG
-106 PSD mask:
M (dBc) = Max ( {K
–
100 log |f
–
f
c
| + 90 log (R)}, {-(55 + 10 log (P))} ), |f
–
f
c
|
≥ R/m where
M
=
power relative to unmodulated carrier (i.e., units of dBc) at frequency f (MHz)
f
=
frequency in MHz
f
c
=
the carrier frequency in MHz
R
=
the bit rate in Mb/s
P
=
the rated power output of the UUT, in Watts
and the values of K and m are as tabulated in Table 18.
Table 18: K and m Values per Waveform
K
m
PCM/FM, Tier 0
-28
2
SOQPSK TG, Tier I
-61
4
MULTI-h CPM, Tier II
-73
4
As noted in the equation above, the mask has a floor at
–
(55 + 10 log(P)) dBc, and the mask imposes no limit on the
spectrum for frequency offsets less than R/m. Representative examples of the transmitted spectrum, with the
appropriate mask, are shown in Figure 31, Figure 32, and Figure 33.
