MIL-PRF-1/1000B
b. Over the band, the input to pads P2 and P3, with precision guide sections on figure 8 in test openings 1 and 2, shall be down
35 dB from the signal input at plane A.
c. Waveguide pads P2 and P3 shall introduce at least 10 dB of attenuation. Pad P1 is adjustable with a minimum attenuation of
6 dB and is set as described above in 2.4, acceptance limits.
2.6 Comparison-standard dummy. The comparison-standard dummy shall be similar to that shown on figure 2 and shall meet the
following electrical requirements.
2.6.1 Reflection. The reflection at 12 frequencies of the comparison-standard dummy shall fall within a radius of 0.5 dB SWR (1.06
VSWR measured at the center of a Smith Chart) of the following locations on a Smith Chart when measured as described:
Location
X
Frequency
R
Re ac tan ce
j
Re sis tan ce
(+5 MHz)
Zo
Zo
-.27
1.19
8,500
+.12
1.08
8,600
-.02
.91
8,700
+.10
.73
8,800
+.24
.82
8,900
+.12
1.01
9,000
-.12
.91
9,100
-.09
.73
9,200
+.06
.71
9,300
+.16
.88
9,400
+.10
1.03
9,500
+.18
1.27
9,600
These measurements shall be made in M85/1-073-120 waveguide with the dummy followed by a termination that has a reflection of
less than 0.1 dB SWR. The reference for the measurement shall be at the input flange of the dummy, marked IN, corresponding to
the high-power end of a 6164 TR tube.
2.6.2 Transmission. The transmission properties of the comparison-standard dummy shall be tested by determining the frequencies
of resonance in the circuit shown on figure 4 with the fittings shown on figure 5. For this test, it shall be possible to measure the
frequency to within ± 1 MHz. The minimum loss in transmission through the comparison-standard dummy shall occur at the following
frequencies:
8,394 ± 5 MHz
8,556 ± 5 MHz
8,966 ± 5 MHz
9,433 ± 5 MHz
9,705 ± 5 MHz
2.6.3 Stability. The comparison-standard dummy shall meet all the requirements specified in 2.6, 2.6.1, and 2.6.2 after temperature
cycling over the range of -50°C to +100°C.
2.7 Differential standards.
2.7.1 Reflection. The differential reflection standard used to determine the reflection acceptance limits of 2.0 dB SWR shall be shown
on figure 6.
2.7.2 Transmission. The differential transmission standard used to determine the transmission acceptance limits of 5.0 degrees shall
be as shown on figure 7. An alternate design such as the Wheeler Laboratories Model 261, or equivalent, is also acceptable.
2.7.3 Precision guide. The precision guide used in the waveguide comparison circuit with the differential standards shall be as shown
on figure 8.
6
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