MIL-PRF-1/1055F
TABLE I. Testing and inspection - Continued.
12/
All tests listed under conformance inspection, part 1, are to be performed at the conclusion of the holding
period.
13/
Grid anode resonance: Test in cavity in accordance with DSCC Drawing No. D64102. Cavity shall resonate
at 1.74 GHz ±2.5 MHz with tuning slug in accordance with DSCC Drawing No. B64103 at TA = 25°C ± 5°C.
Grid-cathode resonance. Test in cavity in accordance with DSCC Drawing No. D64102. Cavity shall
resonate at 1.793 GHz ± 2.5 MHz with tuning slug in accordance with DSCC Drawing No. B64103 at
TA = 25°C ± 5°C.
When plotted on graphs of resonant frequency versus grid-anode capacitance and resonant frequency
versus grid-cathode capacitance, the tube under test (TUT) shall be represented by a point within a
parallelogram whose four corners are located by the following points:
Point
Capacitance (pF)
Frequency (GHz)
C-gp
C-gk
F-gp
F-gk
1
2.10
4.60
1.928
1.890
2
2.10
4.60
1.947
1.914
3
2.45
5.45
1.895
1.851
4
2.45
5.45
1.914
1.875
14/
Test in cavity in accordance with Drawing No. 253-JAN 21/. Measure useful power output with the coupling
and tuning adjusted for maximum power output. The tube shall operate under the given conditions and after
the required circuit adjustments for a minimum of 10 seconds without arcing or instabilty, as evidenced by
pronounced variations in the average anode current meter or the power output meter. If temporary arcing
does occur during the 10-second period, the tube shall subsequently operate for 60 seconds without arcing.
The test may be discontinued at the end of the 10-second period if the power output has not completely
stabilized but is rising. If the power output is falling, the test will be continued until a stable reading is
obtained. For qualification purposes, a stabilized reading shall be obtained. All readings shall be
"nonsquegging" power.
15/
The pulse characteristics are defined as follows:
a.
epy is the smooth peak voltage excluding spike (see method 1296).
b.
The interval of trv and tfv is between 20 and 85 percent of the smooth peak value of the voltage pulse.
c.
The definition of tp is applicable to tpv.
d.
The parameter tpv, tfv, and trv may be measured with the tube replaced by a 1,000-ohm noninductive
resistor.
The load VSWR shall be 1.5 maximum.
16/
The insulation between the grid and the cathode shall be measured with a voltage of 100 V dc. The other
insulation test shall be made in accordance with method 1211.
6
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