HP 8656 Series User Manual

specifications
SPECIFICATIONS describe the instruments warranted
performance and apply after a 30 minute warm-up. All
SPECIFICATIONS are valid over the signal generator's entire
OperatingtEnvironmental Range unless otherwise noted.
SUPPLEMENTAL CHARACTERISTICS (shown in italics) are
intended to provide additional information useful in applying
the instrument
by giving typical (expected), but not warranted
performanoe.
Analog Modulation Mode
All specifications for the HP 8657D in analog mode are
identical to tho* of the HP 8657B Signal Generator
for frequencies from 100 lcHz to 1030 MHz (overrange
. to 1040 MHz). Please refer to the HP 8657B
' specifications for complete HP 8657D analog mode
specifications.
d4 DQPSK Digital Modulation Mode
FREQUENCY
Range (10-digit LED display):
10 MHz to 129.9 MHz.
81 0 MHz to 965 MHz.
1420 MHz to 1540 MHz data inverted.
Resolution: 1 Hz.
Switching Speed (to be within 100 Hz of final
frequency): <35 ms. (does not apply when switching
between frequency ranges listed above)
Accuracy and Stability: Same as timebase used.
SPECTRAL PURITY
SUPPLEMENTAL CHARACTERISTICS
Harmonics: Typically c-30 dBc.
Nonharnwnic Spurious: Typically <4O dBc.
Residual FM (no data clockl:
Typically <6 Hz rms in a 300 Hz to 3 kHz B W.
SSB Phase Noise {no data clock):
Typically c-105 dBc / Hz at a 20 kHz offset.
OUTPUT
d4 DQPSK MODULATION
Modulation Format: rd4 DQPSK
Data Rate,
Symbol Clock: 20 kHz to 25 kHz.
Bit Clock: 40 kHz to 50 kHz.
Pre-modulation Filter: Square-rmt raised cosine.
Filter Shape Factor: a= 0.35 or a= 0.50.
Error Vector Magnitude (+I5 to +35* C):
~4%; 10 to 129.9 MHz and 1420 to 1540
MHz, level <+3 dBm.
<3.5%; 810 MHz to 965 MHz, level <+7 dBm.
UQ Origin offset (+I6 to +35" C):
-35 dB IRF output only).
Iapub: Serial data and clock (bit or symbol).
Outputs: Baseband n /4 DQPSK I and Q signals.
SUPPLEMENTAL CHARACTERISTICS
input Levels: Nomimlly TTL.
Input Inapedunee: Nominally 1 k iZ.
Output Levels,
Symbol Clmk Nominally TTL level.
N x Symbol CCwk Nominally TTL level.
128 x Symbol Chk: Nominally TTL level.
Baseband AN DQPSK I ad Q Output Leuek
Typically 0.35 volts into a 50 R load.
Simultaneous Modulation: lr14 DQPSK and pulse
(AM and FM are not aoaihble in
1c/4 DQPSK modulation mode).
PULSE MODULATION
(standard on HP 8657D, pulse modulation is available in either
the analog or d4 DQPSK modulation mode.)
OnlOff Ratio (n I4 IBQF%K mode):
270 dB; fc < 1030 hfHz.
r50 dB; 1420 MHz 5 f 5 1540 MHz
Rise/Fall Time (10% to 9Whk
35 ns, typically 10 ns.
Level Range: -143.5 dBm minimum in all ranges.
+3 dBm maximum; 1420 to 1540 MHz
and 10 to 129.9 MHz.
+7 dBm maximum; 810 to 965 MHz.
Resolution: 0.1 dB.
Level Accuracy: +l.O dB (-127 dBm to +3 dBm).

HP 8656 Series Specifications

General

Brand	HP
Model	8656 Series
Category	Portable Generator
Language	English