P300H
P300 Modem Installation and Operating Handbook
Page 93
Set Rx=Tx, so most Rx parameters track Tx: [?]
1=Off 2=On
Change, Rx, Rx=Tx Menu
When operating in this unusual situation
without
FEC AND
without
Framing, if the Rx carrier is
not exactly on frequency, then it is possible for the Demod to lock onto a `false lock` (and not be able
to detect it as false as there is no FEC or framing). In this situation you can either:
1.
Use Custom Sweep to narrow the sweep range to avoid the false lock, but be careful not to narrow
it too much so it avoids the true carrier lock as well. DO NOT increase the sweep range, as this
will guarantee to bring false locks within the Demod sweep.
2.
Preferably, adjust the Rx IF Frequency to account for the true Rx carrier frequency (including
offsets), then adjust the sweep range to 50% of the `Normal` value. This will allow the Demod to
re-acquire the carrier (even with further minor variations in Rx carrier frequency) without it
sweeping into a false lock. If you are attempting to do this, when you have the Demod
correctly
locked you can read the current value of offset frequency from the `Demodulator Detailed Status`
screen in order to adjust the Rx IF frequency.
6.7.16 Change, Rx, ESC/AUX/BA Menu
See Change, Tx/Rx, Modulator, ESC/Aux/BA Menu on page 74
6.7.17 Change, Rx, RX=TX Menu
This is described in detail under the initial note on the Rx=Tx function in para 6.7 on page 84
OFF
The receive path operates fully independently from the Tx path
ON
Many of the Rx parameters follow the Tx, which greatly simplifies the
configuration for duplex links. When enabled only the Insert Mux timeslot
selection, Rx Clocking & Buffer Size, and IF Frequency & Sweep control require
setting independently of the Tx path.
Note: Temporarily setting Rx=Tx is a convenient way of copying the Tx configuration to the Rx as when
disabled again the Rx path keeps the Tx values, and does not return to the old Rx values.