 |
|||
|
Page Title:
Transmitter Electronic Components Assembly Performance |
|
||
| ||||||||||
|
|  MIL-c-64025
between RFOUT and GROUND and apply the appropriate data pattern for
each load, then apply the RF source to RFIN. Verify the power output
measured across the 50 ohm resistive part of the load is in compliance
.
with paragraph 3.7.4, Table 3.
4.5.6 Tra ns mitter Electronic Components Assembly Performance
test. The following section describes the performance test of the
Transmitter Electronic Components Assembly, assembly number 9333579.
Unless otherwise specified, all testing shall be performed at room
ambient conditions and with a 50 + 5% ohm 20 watt load resistor
connected between A3-E4 (RF OUT) and A3-E1 (RTN).
4.5.6.1 H a r m o n i c
filter.
The harmonic filter must be tested
with C7 and C9 removed from the 9333590 assembly. Apply a 50 ohm
q
generator sweeping between Fo and 40.0 MHz to A3-E16. Measure the
harmonics of frequency Fo at the 50 ohm termination between A3-E4 and
A3-E1
Verify that the amplitude of the second, third and other
q
harmonics of frequency Fo are attenuated as specified in 3.8.1.c, The
insertion loss of the filter at Fo shall be measured by subtracting
the power (in dB) into the 50 ohm termination at A3-E4 (RFOUT) from
the power applied to the input of the filter. The insertion loss shall
be as specified in 3,8.1.a. The return loss of the filter is measured
by terminating the output of the filter with the 50 ohm resistive load
and using an RF bridge at the input of the filter to measure the
unbalance of the input impedance from a 50 ohm resistive input. The
return lOSS shall be as specified in 3.8.l.b.
4.5.6.2 RF Power amplifie test.
Apply +13.5 + 0.1VDC to A3-E3
(vBATT), 3.6+1.6 vOlts tO A3-E9 (SEND), and 0.0+0,2 vOlts tO A4- E16
(TUNE) and A4-E20 (STROBE IN). Verify that the RF power into the 50
ohm load resistor is in compliance with the requirements of 3.8.2.1.
While the RF amplifier is enabled, verify that the current drain into
A3-E3 (VBATT) is in compliance with the requirements of 3.8.2.2.
4.5.6.3 Tuning attenuator Pad test. APPly +13.5 + 0.1VDC to A 3 -
E3 (vBATT), 4.8+0.2 volts to A4-E16 (TUNE), 3.6+1.6 volts to A3-E9
(SEND), and 0.0+0.2 volts to A4-E20 (STROBE IN). Verify that the RF
power into the 50 ohm load resistor is in compliance with the
requirements of 3.8.3.
4.5.6.4 Transmitter c u t o f f
voltage
t e s t . Apply 10.55+0.05 xDC
tO A3-E3
(vBATT) , 3.6+1.6 volts to A3-E9 (SEND), and 0.0+0.2 volts to
A4-E16 (TUNE) and A4-E20 (STROBE IN). Verify that the voltage at A4-
E22 (A.7.+5vDC) is 5.0+0.4 V0lts Reduce the voltage at A3-E3 to
.
9.45+0.05 VDC and verify the voltage at A4-E22 is 0.0+0.5 volts is in
compliance with the requirements of 3.8.4.
4.5.6.5 Current
limiter test.
Short the drain to the source of
Q5 on the 9333590 assembly, apply +13.5+0.1 VDC to A3-E3 (VBATT),
3.6+1.6 Volts to A3-E9 (SEND), and 0.0+0.2 volts to A4-E16 (TUNE) and
A4-E20 (STROBE IN). Verify that the current drain into A3-E3 (VBATT)
is in compliance with the requirements of 3.8.5. Note, the short
applied shall be limited to 30 seconds in any two minute period when
the transmitter is enabled.
143
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals