Lectrosonics HH Alignment Procedure page 6

NOTE: This segment may be performed using one known good pre-tested audio board to test multiple radio boards
Spectral purity measurements and RF Mute function
Prerequisite(s): FPGA IC programmed
Connect RF Board J3(J4 common) DUT output to a splitter that feeds to the SpecAn, Frequency Counter high
frequency input and the ModAn.
Momentarily connect audio board TP22 to J5 pin 4 (enter Set-up mode)
Note Entering Set-up mode is not necessary if the Alternate Method is exercised.
Apply +3.0VDC, 500mA current limit in at battery contact J8 (J9 is circuit common)
Using the test key pad navigate to the "PwrCal" screen
Step thru all 6 PwrCal measurement while checking for spurs using both prescribed setting in the next steps. This
will result in 12 different spur measurements.
Measure spurs 5 to 1495MHz RBW=30kHz, VBW=10kHz
Note Neither the 2nd nor the 3rd harmonic should be considered as a spur
Measure spurs carrier freq +/- 20MHz RBW=30kHz, VBW=10kHz
Using the test key pad navigate to the "Standby" menu and press the MENU/SEL to activate RF Mute
Measure RF carrier output at radio board J3
Press MENU/SEL button again to get to the "Xmit" menu, Pressing MENU/SEL again take unit out of "Standby"
Measure carrier signal power to at radio board J3
Using the test key pad navigate back to the frequency "Main" screen
Modulation level and distortion adjust
Prerequisite(s): FPGA IC programmed
DUT at middle carrier frequency
channel=XX
NOTE BL944 specimens are permitted to exhibit 150% of otherwise allowable distortion. Some products have required this
additional margin, others have not. At the time of this writing it is unknown how this product will shake out.
set channel (0(00) to 1020 (ff) in normal
tuning mode, 80 is 512)
≤ -65 dBc
≤ -65 dBc
≤ -60 dBc
≥ +5 dBm