CARRIER FREQUENCY
Range
10 kHz to 2.05 GHz with a resolution of 1 Hz (2026A)
10 kHz to 2.51 GHz with a resolution of 1 Hz (2026B)
Accuracy
As frequency standard
RF OUTPUT
Output Range
Freq Range Individual Combiner
10 kHz - 250 kHz -140 to +13 dBm Uncalibrated
250 kHz - 1 MHz -140 to +24 dBm Uncalibrated
1 MHz - 1.2 GHz -140 to +24 dBm -140 to +10 dBm
1.2 GHz - 2.51 GHz -140 to +20 dBm -140 to +6 dBm
Maximum output is further reduced by 5 dB when Pulse modulation
is selected and/or by up to 6 dB when AM is selected dependant
upon AM depth.
Resolution
0.1 dB
RF Level Units
Units may be set to µV, mV, EMF or PD; dB relative to 1 µV, 1 mV,
EMF or PD; or dBm. Conversion between dB and linear units may be
achieved by pressing the appropriate units key (dB or V, mV, µV). The
output level can be normalized for 75 W operation with an optional
external impedance converter (applies to all outputs simultaneously).
RF Output Accuracy (over temp. range 17 to 27°C)
Freq Range Individual Combiner
10 kHz - 250 kHz ±0.8 dB from Unspecified
-127 to +13 dBm
250 kHz - 1 MHz ±0.8 dB from Unspecified
-127 to +6 dBm
±1.0 dB from
+6 to +24 dBm
1 MHz - 1.2 GHz ±1.0 dB from ±1.0 dB from
-127 to -100 dBm -127 to +4 dBm
±0.8 dB from
-100 to +6 dBm
±1.0 dB from
+6 to +24 dBm
1.2 GHz - 2.51 GHz ±1.6 dB from ±2.0 dB from
-127 to +6 dBm -127 to 0 dBm
±2.0 dB from
+6 to +20 dBm
Temperature Stability
Freq Range Drift(dB/°C)
10 kHz - 1.2 GHz <±0.02
1.2 GHz - 2.51 GHz <±0.04
RF level tracking (over temp range +17 to +27°C)
Relative level accuracy between any two or more combined signals
(of equal amplitude), is typically:
(1)
RF level 1 MHz to 1.2 GHz 1.2 GHz to 2.51 GHz
-18 dBm to +4 dBm ±0.3 dB ±0.6 dB
<-18 dBm ±0.6 dB ±1.2 dB
Attenuator hold
Inhibits operation of the step attenuator from the level at which the
key is enabled. Useable for a level reduction of at least 10 dB.
Typical accuracy ±3 dB.
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 for carrier frequencies up to 2.51 GHz (2.05 GHz for 2026A).
Combined output
Output VSWR is less than 1.22:1 for carrier frequencies between
1 MHz to 1.2 GHz and less than 1.32:1 for carrier frequencies up to
2.51 GHz (2.05 GHz for 2026A).
RF Output connector
50 W type N connector to MIL-PRF-39102.
Output protection
Individual outputs
Protected from a source of reverse power up to 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 (above 1 MHz)
Individual outputs:
Typically better than -30 dBc for RF level up to +6 dBm, typically better than -25 dBc for RF levels up to +18 dBm (+14 dBm above
1.2 G Hz ).
Combined output:
Typically better than -30 dBc for RF level up to -18 dBm, typically better than -25 dBc for RF levels up to +4 dBm. (0 dBm above
1.2 G Hz ).
Sub- and Non-Harmonics (for offsets >3 kHz)
Better than -70 dBc to 1 GHz, better than -64 dBc above 1 GHz, better than -60 dBc above 2 GHz.
Isolation
Better than 80 dB between individual outputs in use
Better than 60 dB from a used individual output and 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 Two Tone Intermodulation*
10 MHz to 2.51 GHz <-80 dBc
5 MHz to 10 MHz <-75 dBc