MIL-PRF-1/1623C
TABLE I. Testing and inspection - Continued.
1/
Cathode, one leg of heater, and focus electrode are connected internally. The anode-helix and collector are operated at ground
potential.
2/
The average duty cycle shall not exceed 0.006 during any 31-millisecond interval, and no pulse width shall exceed 2 percent of the
pulse period.
3/
The pulse duration (tp) shall be defined as the time interval between the first and last instants at which the instantaneous amplitude
reached 90 percent of the peak pulse amplitude. The combination transition period of rise and fall times of the pulse, between the
10 percent and 90 percent amplitude points, shall not exceed 0.75 microsecond.
4/
25 cfm of air at sea level is required for operation at ambient temperature to 65 C.
5/
The following information shall be included in the marking of each tube:
a.
Serial number.
b.
Heater voltage.
c.
Pulse beam voltage for operation with small signal and large signal in accordance with 6/ (Gss/G1s).
d.
iwdc/iwrf', where iwrf is helix current with pi of 0.5 watt at 3 GHz, and iwdc is the helix current with pi = 0.
e.
Permanent legible inscription shall identify rf input and output connections, heater, heater-cathode, anode-helix, and ground
stud.
6/
The optimum pulse beam voltage for small-signal gain and large-signal gain shall be specified for each tube and included on the
identification plate of the tube. The tube under test (TUT) shall be operated within 3 percent of the voltage specified for the
corresponding mode of operation.
7/
First article sample inspection shall conform to the requirements of appendix F of MIL-PRF-1 and shall consist of performing all test
specified on this tube specification sheet. Invitation for bids should provide that the preparing activity reserves the right to waive the
requirements for first article samples as to those bidders offering a product which has been previously acquired or tested by the
Government, and that bidders offering such products who wish to rely on such production or test, must furnish evidence with the bid
that prior Government approval is presently appropriate for the pending acquisition.
8/
Unless otherwise specified, the acceptance level for all tests listed under conformance inspection part 1, shall be 1.0, inspection
level II.
9/
Small-signal gain variation and large-signal gain variation shall be the difference between the maximum gain and the minimum gain
at the test frequencies specified.
10/ The input of the TUT shall be terminated with a matched load, and the output shall be connected to a +10 dB directional coupler.
The signal from the arm of the coupler shall pass through Microlab HP-FH2801 and LP-FL3201 filters, or equivalent, into a crystal
detector. The output of the coupler shall be connected through a 3-dB attenuator to a variable-phase short circuit. The spurious
power output shall be the maximum signal detected at the crystal as the phase of the short is varied through the one-wave length at
3 GHz.
11/ The VSWR and frequency at both input and output shall be measured and recorded at the point of maximum VSWR in the
frequency band.
12/ The life-test end points shall be the point in time when power output falls below 750 w peak under condition of 0.5 w input anywhere
within the frequency band with tube operating into a matched load.
13/ During (or after) performance of specified test the TUT shall be capable of passing tests contained in conformance inspection,
part 1
3
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