MFJ-1270C/1274C MANUAL COMMANDS
Page 177
RXCAL
is an immediate command. When invoked, the MFJ TNC generates
test signals (based on
CALSET
-- see below) that are used by the internal
tuning software to align the demodulator components.
To use the
RXCAL
feature,
1)
Align the modulator components as described in the owners manual.
2)
Use the
MODE
command to select the demodulator to be tuned.
Make
sure
JMP8
,
JMP7
and
JMP4
are installed.
3) Compute:
n
=
9600/Bit Rate
Where the "bit-rate" is the same as the baud rate in packet modes and
the baud rate in all other modes. See
CALSET
Adjustment & Location
Map for "
n
" value.
4)
Type the command "CALSET n". Use the 'n' from step 3
5)
Type the RXCAL command.
6)
Tune the appropriate trimpot (R79, R113, R114, or R115) until the
DCD light is lit fully.
7)
Continue tuning this trimpot until the CON and STA LEDs flash either
alternately every half second, and/or both light up
8)
Return to step 2 until all the demodulators are tuned.
