Fox Supplemental Material - Berkeley Varitronics Systems Fox Manual

Once the lock is re-aquired, the internal GPS unit will remember the local conditions and the next time the lock process will take
less than 5 minutes (depending on antenna placement and how far the Fox has been moved since being turned off).
Whenever possible, place the GPS antenna on a metal surface (such as the roof of an auto). For best results, the antenna should
be able to "see" a large portion of the sky (not blocked by buildings or trees).
CAUTION: DO NOT turn the GPS power on or off while the
turning on the main power switch.
FOX Supplemental Material
FOX
data file structures
NOTE:byte - 8 bit unsigned value
word - 16 bit unsigned value
Common to RF DUMP (serial) and ATA files
Fox type and measurement code:
Each file will contain an 8 bit code that identifies the type of measurement contained in the file and the type of
make the measurement. Bits 3-0 contain the measurement code as follows:
MEASUREMENT CODES
Value
(bit 3-0)
1 CO-CHAN
2 ADJ-CHAN
3 1 chan
4 Survey 20 chan
5 Var Sweep
6 1 Mhz sweep
7 POCSAG DATA
8 fast fade
Bits 7-4 (high nibble) contain the Fox Type code. Use this code to determine the channel number to frequency conversion.
Code (hex) FOX
0x10 851-869
0x20 900-930
0x30 935-941
0x40 928-941
0x50 806-824
0x60 869-893
0x70 824-848
0x90 Reserved
0xa0 928-941/Pocsag 928
0xb0 145-160
0xc0 220-222
0xd0 450-465
0xe0 1850-1890
0xf0 1930-1970
Measurement
type Base Freq (MHz)
851
900
935
928
806
869
824
145
220
450
1850
1930
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FOX main power switch is on. When using the GPS, turn on BEFORE
Step (KHz)
12.5
12.5
25
12.5
12.5
12.5
30
30
10
5
12.5
50
50
FOX used to