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
≤
-65 dBc
Note
Neither the 2nd nor the 3rd harmonic should be considered as a spur
Measure spurs carrier freq +/- 20MHz RBW=30kHz, VBW=10kHz
≤
-65 dBc
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
≤
-60 dBc
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
≥
+5 dBm
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
set channel (0(00) to 1020 (ff) in normal
tuning mode, 80 is 512)
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.
