User's Manual

Pacific Crest Corporation ADL Access User Guide – Dealer Version Page 14 of 28
possible. To do this, click the down arrow to the right of the Squelch field and
click on the desire noise threshold level:
I will need to make all new screen grabs once the SW is frozen. This screen must
be replaced with one saying:
- “High (Base)”
- “Medium”
- “Low (Rover)”
In general, you should initially set Squelch to:
- High when the radio will mostly be transmitting data, (as with radios used to
transmit RTK corrections from a GPS base station)
- Low when the radio will mostly receiving data (as with GPS rover radios)
However, you may need to adjust the Squelch setting as needed according to the
level of environmental noise. Most ADL radios include a user interface that
permits Squelch adjustment in the field without running ADL Access.
e. Modulation Type
ADL Access allows you to configure your radio for either Gaussian Minimum-
Shift Keying (GMSK) modulation or 4-Level Frequency-Shift Keying (4FSK)
modulation. The default is GMSK because GMSK is generally less sensitive to
interference from environmental noise. 4FSK modulation, on the other hand,
supports approximately twice the data throughput of GMSK. When you are using
a bit rate above 9600, the general recommendation is to use 4FSK modulation.
To switch to 4FSK modulation, click the down arrow to the right of the
Modulation Type field and click 4FSK:
Note: not all data protocols support 4FSK modulation. If you select 4FSK
modulation on the Radio Link screen, you will not be able to select an
incompatible protocol on the Serial Interface screen (see below).
f. TX Power
If you purchased your ADL radios as a transceiver, you can configure it for
various output power levels. To adjust the transmit power click the down arrow
to the right of the TX Power field and select a different setting.