Garmin GDL 82 - Pre-Installation Transponder Check

Installation Planning and Considerations
190-01810-00 GDL 82 TSO Installation Manual
Rev. 5 Page 4-2
4.2 Pre-Installation Transponder Check
Use a ramp tester to verify the existing transponder system’s peak output power and receiver sensitivity is compatible
with the GDL 82 before installation. The GDL 82 introduces up to 1.5 dB loss in the transmission line as measured at
the antenna output.
Table 4-1 Pre-Installation Check
STEP DESCRIPTION NOTES
1.
Determine the RF Peak Output Power and
Receiver Sensitivity IAW Part 43, Appendix
F for the existing transponder system.
Record the observed values of RF Peak
Output Power and Receiver Sensitivity.
RF Peak Output Power: ___________
Class A: > 21.0 dBw (125 watts)
Class B: > 18.5 dBw (70 watts)
Receiver Sensitivity (MTL): __________
Any Class: MTL = -73 ±4 dBm
2.
Subtract the anticipated maximum loss
(1.5 dB) from the peak output power and
add 1.5 dB to the sensitivity values
determined in Step 1.
<Output Power> dBw - 1.5dB =_____dBw
<Sensitivity> dBm + 1.5dB =______dBm
3.
Verify that the peak output power and
sensitivity meet the required minimums.
Peak Output Power:
Class A: > 21.0 dBw (125 watts)
Class B: > 18.5 dBw (70 watts)
Receiver Sensitivity (MTL):
Any Class: MTL = -73 +
4 dBm