If the photograph is clicked, it grows.

HP Z3801A GPS Time and Frequency Reference receiver
SOLD OUT sold
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GPS Receiver:6-ch Parallel tracking GPS engine C/A Code,L1Carrier HPEnhanced GPS Technology HP SmartClock technology10MHz out 1.9Vp-p 50ohms BNC(f) Acc<1*10E-9/day SSBnoise-135dBc/1KHzoffset 1pps-out Jitter<200ns TimeError<7us Unlock24hoursAcc<1us(Locked GPS)
LED:Power,GPSLock Holdover,Alarm
PC-interface RS422(RS232C) Straight 19200bps 7bit odd D-sub-25
PowerSupply:AC100-115V 50/60Hz DCout 48V 2.2A
Rack in with Handle
150H450W350D

PowerCord GPS-Antenna E-manual