HP 8648 A/B/C/D - Changpuak.ch

Function
Setting the Format The format menu, shown in the previous figure, has the following
settings:
lb-6 Operation Reference
FORMAT selects the pager protocol being tested.
FLEX:
FLEX-TD:
POCSAG:
PN15:
RESYNC:
SERVICE:
FLEX format
FLEX-TD format
POCSAG format
Pseudorandom Sequence (PN 15)
Re-synchronization function (for FLEX/FLEX-TD
pagers only)
Servicing the HP 8648A Option 1EP
Note Depending on the format selected, the parameter menus will be
different. Messages displayed while sending encoding signals are also
unique to each selection.
POLARITY selects the data polarity.
NORMAL: Normal polarity
POCSAG FLEX/FLEX-TD FLEX/FLEX-TD
(a-Level FSK), (4-Level FSK)
RESYNC, PN15
“1”: Carrier - Deviation “1”: Carrier + Deviation “10”: Carrier + Deviation
“11”: Carrier + (Deviation/J)
“01”: Carrier - (Deviatiod3)
“0”: Carrier + Deviation “0”: Carrier - Deviation “00”: Carrier - Deviation
INVERSE: Inverse polarity
POCSAG FLEX/FLEX-TD FLEX/FLEX-TD
(S-Level FSK), (4-Level FSK)
RESYNC, PNlS
“1”: Carrier + Deviation “1”: Carrier - Deviation “10”: Carrier - Deviation
“11”: Carrier - (Deviation/J)
“01”: Carrier + (Deviation/S)
“0”: Carrier - Deviation “0”: Carrier + Deviation “00”: Carrier + Deviation
FILTER selects whether or not the baseband modulation filter
(lOth-order Bessel low-pass filter, -3 dB at 3.9 kHz) is used.
Normally the filter is on.
ON: Uses the low-pass filter
OFF: Does not use the low-pass filter