SCOPE GEO40A User Manual
GEO40USER
2 of 10
Issue 1
Max. 40 characters Power Up message
Unread reminder
DD/MM or MM/DD date display format selectable
Normal or word wrap display mode
Pre or Post time stamp facility
30 – 180 seconds no alert period for repeated message
‘IN RANGE’ & ‘OUT RANGE’ indicator display mode & grace time setting
On-line or OTA programming - for Public message receive mode only
2.3 Electrical Specification
•
Rx Frequency
135MHz~175MHz; 278MHz-280.999MHz
448MHz-471.999MHz
•
Sensitivity @1200bps
−
Best position:
20.5dBµV/m 512ps; 22.5dBµV/m /1200bps
•
Adjacent Channel Rejection > 60dB
•
Spurious Rejection
135-174.999MHz;278-280.999MHz
> 55dB
448-471.99MHz
>
50dB
•
Image
Rejection
135-174.999MHz;278-280.999MHz >
50dB /-42.8MHz; -910KHz
448-471.999MHz
>40dB/-42.8MHz;
50dB/-910KHz
•
Intermodulation Rejection
>50dB
•
Frequency
stability
+/-
10ppm
•
Deviation
Carrier
+/-
4.5KHz
•
Tone alert level
> 80dBc at 30cm away
•
Nominal Battery Life
more than 30 days (‘AAA’ alkaline battery)
2.4 Technical Specification
•
Code Format
POCSAG
•
Bit Rate
512/1200bps switchable
•
Channel
Space
−
Receiver:
25KHz
•
Modulation Method
FSK-NRZ
