User Guide

NSE–1
System Module UP8S
Original 03/98
3/A3–S12
ac–leveldc–levelconditionnametestpoint ref
J251 AGND pcb ground 0V
J256 COBBADAX active state pulse active 0V, non–active 2.8V
J500 Control voltage for UHF VCO module G600 channel 60
channel 1
channel 124
2.25 +/– 0.25 V
> 0.8 V
< 3.7 V
J504 Control voltage for VHF VCO circuit typ. 2.0 –2.2 V min 0.5 / max 4.0 V
J508 VSYN_2 ( regulated supply for PLLS ) 2.8 V min 2.7 / max 2.85 V
J534&J536 13 MHz IF output to N250 –95 dBm @ X540
(ext. RF connector )
RXC at level of full
calibrated gain
typ ca. 1.0 – 1.1 V pulsed
min. 0.7 / max. 1.4 V
typ. 50 mVpp balanced voltage at 13 MHz
J538 13 MHz output from Z620 to N620 –95 dBm @ X540
(ext. RF connector )
RXC at level of full
calibrated gain
typ. ca. 1.5 V pulsed typ. ca 600 uVrms
J542 VHF VCO output ( 232 MHz ) – typ. 400 mVpp.
> 100 mVpp required
J554 TXC ( TX power control voltage ) @level 19 typ. ca. 0.6 V pulse
@level 5 typ ca. 1.8 V pulse
J556 TXP ( TX enable ) 2.8 V logic level pulse,
( max. 0.8 V ”0” / min 2.0 V ”1” )
J558 TXQP ( other half of balanced Q–signal ) 0.8 V pulsed 400 mVpp
J560 TXIP ( other half of balanced I–signal ) 0.8 V pulsed 400 mVpp