Recommendation: For transmitting position data
with the Tracker/DSP TNC, we suggest always to
use the frequencies as shown in the list with the
respective sideband. The position data can then
be transmitted either only in RPR, or in RPR and
FSK alternately (%AH = 1). In both operating
conditions all physical channels are then automatically set in the correct way.
(In case of an alternating transmission, i.e.
%AH = 1, the Tracker automatically uses %F = 2000
Hz, in order to set the correct interval of 500
Hz between RPR and FSK channels without any user intervention.)
With gateways offering RPR and FSK 300 on one
channel simultaneously, it is assumed that the
center audio frequency of the FSK demodulator
(%F-parameter) is 500 Hz higher than the center
audio frequency of the RPR demodulator. The space
between the center frequencies of a simultaneous
FSK/RPR channel pair is always 500 Hz.
Basically, gateways receiving RPR and FSK300
simultaneously can also be reached in FSK300 with
the %F standard setting of the Tracker (center frequency of 1700 Hz) in LSB mode.
In this case, if LSB is actually used, 3.7 kHz
have to be added to the figure shown in USB dial
frequency listings. In case of an LSB channel,
0.3 kHz have to be deducted from the listed
frequency. Gateways shown in the list as 10147.3
kHz USB can hence be reached in LSB mode with the
standard setting of the Tracker (%F = 1700 Hz,
%AH = 0) on the standard dial frequency of
10151.0 kHz. Gateways listed as 14103.3 kHz LSB,
can be reached in LSB with the default setting of
the Tracker (%F = 1700, %AH = 0) on the standard dial frequency of 14103.0 kHz.
In case of alternating RPR and FSK transmissions
(%AH = 1), the frequencies shown in the list and
the respective side bands have to be programmed.
For example, the dial frequencies of 10151.0 kHz
LSB or 14103.0 kHz USB MUST NOT be set, as
neither the RPR, nor the FSK channel would be reached correctly.