Bird Technologies 4304A - Manual (Page 33)

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1. Remove the rear panel from the 4304A to access the adjustment potenti-
ometers.
2. Connect the calibration equipment as shown in Figure 10.
3. Set the range switch to 15 and adjust the RF source to apply 12.5 watts at
100 MHz.
4. Adjust R9 (Figure 11) until the 4304A meter indicates 12.5.
5. Measure the actual power for a meter reading of “12.5” for the following
frequencies: 25 MHz, 50 MHz, 80 MHz, 150 MHz, 225 MHz, 400 MHz, 400
MHz, 800 MHz, and 1000 MHz.
6. Calculate the average value of the measurements in Step 5. (Add the high-
est and lowest values then divide by 2.)
7. Divide 156.25 by the average value calculated in Step 6 then set the RF
source to this value at a frequency of 100 MHz.
8. Adjust R9 until the 4304A meter indicates 12.5 then wait several minutes
before proceeding to Step 9.
Figure 10 Calibrating the 4404A-1 Element
9. Set the 4304A range switch to 5.
10. Divide 50 by the average value calculated in Step 6 then set the RF source to
this value at a frequency of 100 MHz.
11. Adjust R10 until the 4304A meter indicates 4.0.
12. Set the 4304A range switch to 50.
13. Divide 500 by the average value calculated in Step 6 then set the RF source
to this value at a frequency of 100 MHz.
14. Adjust R8 until the 4304A meter indicates 40.0.
15. Adjust the RF sourece until the 4304A meter indicates 40.0 at a frequency
of 405MHz then record the actual power level at the RF source. This infor-
mation will be used in a later step.
16. Set the 4304A range switch to 150.
17. Divide 1562.5 by the average value calculated in Step 6 then set the RF
source to this value at a frequency of 100 MHz.
18. Adjust Rxxxx (?) until the 4304A meter indicates 125.
19. Set the 4304A range switch to 500.
500W 25-1000 MHz
RF SOURCE
POWER
STANDARD
4304A
1.5
50
TRANSIT
15
5