4
Specifi cations
Amplitude
Third-order intercept (nominal)
(For two signals spaced less than
200 MHz apart)
11974A ≥ +13 dBm
11974Q ≥ +13 dBm
11974U ≥ +13 dBm
11974V ≥ +13 dBm
IF subharmonic response (nominal)
Intercept (2nd order; response at
f
IF
/2 above input signal)
f
IF
/2 = 160.7 MHz
(8566B/71000C)
f
IF
/2 = 155.35 MHz
(8563A/62A/61B/60A)
11974A ≥ +45 dBm
11974Q ≥ +45 dBm
11974U ≥ +45 dBm
11974V ≥ +30 dBm
Dynamic range
Refer to Figure 3
Inputs and outputs
(all values are nominal)
RF input
Waveguide size, fl ange type
Size Flange
11974A WR-28 UG 599/U
11974Q WR-22 UG 383/U
11974U WR-19 UG 383/U-M
11974V WR-15 UG 385/U
Maximum
RF input
level (CW,
peak, or
average)
+25 dBm
VSWR (at
peak of
preselector
fi lter)
< 3.0:1
Inputs and outputs
(all values are nominal)
LO input
Connector type SMA (f)
Frequency range
11974A 3.3 GHz to 5 GHz
11974Q 3.3 GHz to 5 GHz
11974U 4 GHz to 6 GHz
11974V 3.5 GHz to 5.3 GHz
Maximum LO
input level
+14.5 dBm to 16 dBm
VSWR < 2.0:1 (50 Ω)
IF output
Connector type SMA (f)
Match < 1.6:1 (50 Ω)
Tune + span input
Connector type BNC (f)
Options
Option 001: Input isolator attached
and included in calibration. An input
isolator provides a specifi ed broadband
RF input match. This is important
when the device under test requires
protection from out-of-band refl ections
off the 11974’s input tracking fi lter.
With Option 001, the 11974 conversion
loss is calibrated with the input isolator
in place so that system amplitude
accuracy is maintained.
Specifi cations changes for Option 001
Amplitude
Displayed average noise level and
maximum conversion loss: Add +2 dB
to the standard specifi cations for A, Q,
and U bands; add +3 dB for V band.
RF input VSWR
(across full waveguide band)
11974A, Q, U < 1.6:1
11974V < 2.3:1
RBW = 300 Hz
RBW = 10 Hz
Typical spur or noise level (dBc)
RF input (dBm)
Displayed
average
noise floor
Second order
IF subharmonic
distortion
Image and
multiple
response
Third order
intermod
(≤ 200 MHz
signal separation)
–70
–70
–80
–90
–100
–110
–120
–130
–60
–60
–50
–50
–40
–40
–30
–30
–20
–20
–10 0 +10 +20
Figure 3. Agilent 11974A system dynamic range
(154 pagine)
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