The Ignore RX after TX setting specifies a time for which all received frames by
the modem will be ignored after the last TX has ended. This is useful if you
want to use the openSPOT4 to link a repeater to the internet through RF and
the repeater has a lengthy internal buffer and it is still transmitting even after
the openSPOT4 has finished transmitting (which means the openSPOT4 will
start receiving its own stream again).
The modem's Sensitivity level can be changed in 6 levels. Note that increasing
sensitivity decreases the linearity of the filters, which may result in incorrectly
demodulated bits (which means increased BER). By default, sensitivity is low
(level set to 5 or 6) for modem modes using 4FSK.
The sensitivity of the modem's filter can be changed with the Filter gain setting.
Note that increasing sensitivity decreases the linearity of the filters, which may
result in incorrectly demodulated bits (which means increased BER). By default,
filter gain is set to 8.
The modem's AGC (Auto Gain Control) is configured by software for optimal
values for low BER in 4FSK demodulation modes. However, you can turn
automatic AGC on with the Auto AGC setting, but it is recommended to keep
this checkbox off so the openSPOT4's AGC can work on its own.
When the AGC is turned on, you can set the AGC low/high threshold values.
These values will be considered as low and high thresholds for the Auto AGC
circuitry in the modem.
The External VCO checkbox should be checked when an external VCO is
applied to the openSPOT4. Currently there's no external VCO used by the
openSPOT4. Note that applying an external VCO is considered as an after-
market modification and voids the warranty of the openSPOT4.
You can also reset all modem settings back to defaults by clicking on the Reset
modem config back to defaults button.
All of the settings above are stored independently for each modem mode in the
current profile.
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