MIL-PRF-1/1147C
TABLE I. Testing and inspection.
Inspection
Method
Conditions
Symbol
Limits
Unit
MIL-STD-1311
Min
Max
13/ 14/
First Article
Variable frequency
No voltages applied 10/
1031
---
---
---
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15.0
---
V dc
Ef-1
Electrode voltage
1261
If-1 = 170 mA dc
15.0
---
V dc
Ef-2
If-2 = 170 mA dc
Forward and reverse 1/ 2/
Etd-a
41
Voltage drop
3337
48
V dc
Etd-b
41
48
V dc
Rp = 8,000 ohms 3/
Ez
---
2,000
V ac
Ionization
3347
F = 3,300 MHz 3/ 4/ 5/ 7/ 11/
Nr-1
8.60
9.10
dB
Noise figure
4260
F = 3,300 MHz 3/ 4/ 5/ 7/ 11/
Nr-1
8.60
9.10
dB
Noise test
3278
F = 3,270 MHz 4/ 6/
VSWR
1.30:1
1.38:1
---
Match (1)
4256
Ib = 250 mA dc
VSWR
---
1.02:1
---
F = 3,270 MHz 4/ 6/
Match (2)
4256
Ib = 0 mA dc
Life test
---
Epp = 2,000 V ac
No.
2,500
---
Cycles
Rp = 8,000 ohms 3/ 8/ 9/
(One minute on, two minutes off)
Life test end points:
---
11/
Noise figure
4260
Nr-1
8.55
9.15
dB
Ionization
3347
Ez
---
2,000
V ac
1/
The tube shall be tested in the circuit shown in figure 1 or equivalent.
2/
In the test circuits on figure 1, with a filament current of 170 mA dc, the tube shall operate within three tries. The tube shall be
tested and then reverse tested using alternate ends as anode and cathode. One reading of Etd shall be taken not less than
15 seconds after ionization, in each direction.
3/
The tube shall be tested in total darkness.
4/
The test shall be made with the tube mounted in the Noise Tube Mount (see figure 4) of this specification. Termination shall
be made by a matched RG-48/U termination, having a minimum VSWR of 1.01:1 such as Hewlett-Packard S-914A, or
equivalent.
5/
The frequency specified is that of the local oscillator.
6/
The frequency specified is that of the signal generator.
7/
Excess noise ratio shall be measured by comparison with an approved standard. The excess noise ratio measurement tests
shall be made using the test circuit of figure 2 or equivalent. The VSWR, looking into the balanced mixer, shall not be greater
than 2:1. The excess noise ratio measurement tests shall be made, using the test circuit of figure 2 or equivalent. The
VSWR, looking into the balanced mixer, shall not be greater than 2:1.
2
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