MIL-PRF-1/1405E
TABLE I. Testing and inspection - Continued.
1/
A swept frequency from F1 through F3 may be used for this test.
2/
Cathode and one leg of heater shall be connected internally. Anode, helix, and collector shall be at ground potential. All
voltages are referred to ground except heater potential, which is referred to cathode.
3/
The pulse shall comply with the requirements stated in method 4304, pulse characteristics, except that the rise and decay
times shall not exceed 0.5 s and 0.6 s respectively. The peak-to-peak ripple shall not exceed 100 volts.
4/
TE is the temperature at the midpoint of the cylindrical surface of the bulb with the specified flow of cooling air.
5/
Unless otherwise specified, the acceptance level for all tests listed under conformance inspection, part 1, shall be 1.0,
inspection level II.
6/
Each tube shall be marked with the following information:
a.
Manufacturer's identification.
b.
JAN 7640.
c.
Serial number.
d.
Acceptance date.
e.
Cathode voltage for optimum small-signal gain.
f.
Cathode voltage for optimum large-signal gain.
g.
RF input and output connectors.
7/
One reproducible and two prints of data sheets for all tests performed under this specification shall be supplied to the
contractor. One copy of the data sheet shall be packed with the tube.
8/
The rf output pulse shall evidence no more than 10 percent amplitude distortion from any source other than the applied dc
pulse.
9/
The input power, Pi(rf), is defined as incident power from a 50-ohm source at the rf input connector of the tube.
Gss and GIs(1) shall be the difference between maximum gain and minimum gain within the frequency range.
10/
GIs(2) shall be the difference in GIs at tk3 and tk4.
11/
po shall be the difference in power output for Pi(rf) (1) and Pi(rf) (2).
12/
13/
The input shall be terminated into a 50-ohm matched load. The output termination shall be a 3-dB attenuator in series with a
variable-phase short circuit. The bandpass filter shall have a bandpass from 2.1 to 3.9 GHz.
A variation of 5 percent in ek from the test condition 2 value shall result in a gain variation, GIs, from the measured value,
14/
GIs, of not greater than the value specified.
15/
Spectrum width shall be measured with a receiver having an IF bandwidth of 3.0 MHz, or less. In the frequency range 2.8 to
3.2 GHz, the range shall be the respective lowest and highest frequencies at which the signal power is at least 30 dB below
the power of the center frequency.
16/
Service-life guarantee of 1,000 hours is applicable when specified in the contract.
17/
After completion of this test, all tubes shall meet the parameters listed on the data sheet (see 7/).
3
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