GENERAL INFORMATION
46882/439 1-5
VSWR
Individual outputs:
For output levels less than −5 dBm, output VSWR is less than 1.5:1 for
carrier frequencies up to 1.2 GHz and less than 1.7:1 up to 2.4 GHz.
Combined output: Output VSWR is less than 1.22:1 for carrier frequencies between
1 MHz and 1.2 GHz, and less than 1.32:1 up to 2.4 GHz.
Output connector:
50 Ω, type N connector to MIL 390123D.
Output protection
Individual outputs:
Protected from a source of reverse power up to 50 W from 50 Ω, or
25 W from a source VSWR of 5:1. Protection circuit can be reset from
the front panel or via the GPIB or RS-232 interface.
Combined output:
No reverse power protection. Maximum total safe power 0.5 W.
Spectral purity
Harmonics:
Individual outputs:
Typically better than −30 dBc for RF levels up to +6 dBm and typically
better than −25 dBc for RF levels up to +18 dBm (+14 dBm above
1.2 GHz).
Combined output:
Typically better than −30 dBc for RF levels up to −14 dBm and typically
better than −25 dBc for RF levels up to +4 dBm (0 dBm above
1.2 GHz). Harmonics unspecified below 1 MHz.
Non-harmonics (for offsets
>3 kHz):
Better than −70 dBc for carrier frequencies up to 1 GHz;
better than −64 dBc for carrier frequencies above 1 GHz;
better than −60 dBc for carrier frequencies above 2 GHz.
Isolation: Better than 80 dB between individual outputs in use.
Better than 60 dB from a used individual output to the combiner output.
Better than 40 dB between the combiner output and an unused
individual output.
Intermodulation:
At an RF output level of 0 dBm on the combiner into a load VSWR of
2:1 or better:
Frequency range 2-tone intermod*
10 MHz to 2.4 GHz
<−80 dBc
5 MHz to 10 MHz
<−75 dBc
Usable but unspecified down to 1 MHz
*Third-order intermodulation products.
Intermodulation levels reduce with reducing RF levels.
Residual FM (FM off): Less than 4.5 Hz RMS deviation in a 300 Hz to 3.4 kHz unweighted
bandwidth at a carrier frequency of 1 GHz.
Typically <1 Hz at 249 MHz, <2 Hz at 501 MHz, <3 Hz at 1001 MHz,
<6 Hz at 2001 MHz.
SSB phase noise:
Better than −124 dB/Hz at 20 kHz offset from a 470 MHz carrier.
Typically better than −121 dBc/Hz at 20 kHz offset from a 1 GHz
carrier.
Carrier leakage:
Less than 0.5 μV PD at the carrier frequency into a 2-turn 25 mm
diameter loop 25 mm from the surface of the signal generator.
External RF input: The following applies when an external input is connected at the
rear panel and the combiner is set up for ‘independent’ external RF
input.
Insertion loss:
14.75 dB ±1 dB.
Frequency range:
10 kHz to 4 GHz (usable to 5 GHz).
Return loss:
>20 dB to 2.4 GHz.
Max input power:
0.5 W.
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General