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Model 423A/8470A
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Table 1. Specifications
Frequency Range:
423A: 10 MHz to 12.4 GHz
847 0A: 10 MHz to 18 GHz
NOTE
RF may leak through the output
connector, especially below 1 GHz.
It can be reduced, if objectionable,
with a suitable low pass filter.
Frequency Response:1
423A: ±0.2 dB over any octave
10 MHz to 8 GHz; ±0.5 dB
10 MHz to 12.4 GHz.
8470A: ±0.2 dB over any octave
10 MHz to 8GHz; ±0.5 dB
10 MHz to 12.4 GHz; ±1.0 dB
10 MHz to 18 GHz.
Maximum Operating input Power: 100 mW, peak
or average.
Maximum Short Term Input Power: 100 mW (typi¬
cal) peak or average for < 1 minute.
Sensitivity at 25°C:
High Level: < 0.35 mW produces 100 mV output.
Low Level: >0.4 mVdc//±W CW.
Output decreases with increasing temperture.
Typically 0.015 dB/°C from 0°C to 55°C.
SWR:
423A and 8470A: 10 MHz to 4.5 GHz, 1.20;
4.5 GHz to 7.0 GHz, 1.35; 7.0 GHz to 12.4 GHz, 1.50.
8470A: 12.4 GHz to 18.0 GHz, 1.70.
input Impedance: 500 (nominal)
Output Impedance: < 15 ktt shunted by 10 pF.
Output Polarity: Negative (refer to options for posi¬
tive polarity units).
Detector Element: Supplied (refer to Table 2 for re¬
placement assemblies).
Bias: Not required.
Noise: <200 gV p-p, with CW applied to produce
100 mVdc output.
1 As read on a meter calibrated for square-law detectors
(such as HP 415E SWR Meter).
Options:
423A:
Option 001: Matched pair. Frequency response
characteristics (exclusive of basic sensitivity)
track within ±0.2 dB over any octave from
10 MHz to 8 GHz, ±0.3 dB from 8 to 12.4 GHz.
Option 002: Furnished with matched load resis¬
tor (11523A) for optimum square law character¬
istics at 24°C (75°F), < ±0.5 dB variation from
square law over a range of at least 30 dB up to
50 mV peak output working into an external
load >75 kLL Sensitivity typically > 0.1 mV/^uW
when load resistor is used. Overall length 144 mm
(4.5 in.).
Option 003: Positive polarity output.
8470A:
Option 001: Matched pair. Frequency response
characteristics (exclusive of basic sensitivity)
track within ±0.2 dB over any octave from
10 MHz to 8 GHz, ±0.3 dB from 8 to 12.4 GHz,
±0.6 dB from 12.4 to 18 GHz.
Option 002: Furnished with matched load resis¬
tor (11523A) for optimum square law character¬
istics at 24°C (75°F), < ±0.5 dB variation from
square law over a range of at least 30 dB up to
50 mV peak output working into an external
load >75 kill. Sensitivity typically >0.1 mV/jUW
when load resistor is used. Overall length 144 mm
(4.5 in.).
Option 003: Positive polarity output.
Option 012: Furnished with stainless steel type
N male connector.
Option 013: Furnished with stainless steel type
N female connector.
General:
Weight: Net 114 g (4 oz.) 423A and 8470A
Dimensions:
423A: 63 mm long, 20 mm diameter (2.46 in. long,
0.78 in. diameter).
8470A:
64 mm long, 19 mm diameter (2.50 in.
long, 0.75 in. diameter).
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