Datron TW7000MS, Technical Manual

Page: 61 / 100

Reference/Control Board 4: Technical Description
TW7000MS 4-13
4.2.2
Test Procedures
These test procedures require the following equipment:
• Frequency counter
• 100W Dummy load
• Wattmeter
• 250W slug
• Two-tone test box
• Extender card set
Input/Output
Signals 1. Reference the signal output at J61; frequency = 16.777216 MHz Level =
2 VPP.
2. Forward power input (FWDPWR) at J3-15.
3. Reverse power input (RVSPWR) at J3-14.
4. External amplifier ALC input (AMPALC) at J3-10.
5. ALC output (RAWALC) at J3-12.
6. Power level output (PWRLVL) at J3-23.
Adjustments and
Measurements 1. Measure the regulator voltage, U2 pin 16, +5 ±.25V, U5 output 8.0V ±.4.
2. Verify that the oscillator is stabilized.
3. Set the radio transmit frequency to 30.0 MHz and the radio mode to USB
AME.
4. Key the PTT, measure the RF output of the radio and adjust the oscillator
for 30.000000 MHz.
5. Verify the transmit frequency at 15.0 MHz and 2.0 MHz. The frequency
error should not exceed the specification for the installed oscillator
option.
6. Repeat the following adjustments to R1 and R22 until no further
adjustment is required:
• Adjust R1 (high power set) for a transmit output power of 100W
average, single tone at 14.75 MHz.
23 PWRLVL RF power level status line
24 FLTTST RF Filter board status line
25 EN10 RF power level control enable
Table 4-3. Reference/Control Board Interconnects
Connector J3 Description Comment