QRP Labs QCX 5W CW, Assembly Instructions Manual

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QCX assembly Rev 1.08
100
8.12 Cal sys osc
Press Select!
If you have connected a GPS receiver module such as the QRP Labs QLG1 GPS receiver
http://qrp-labs.com/qlg1 with a one pulse per second (1pps) output signal, then when you press
the left (select) button the microcontroller uses the 1pps as a frequency counter gate. It counts the
20MHz system clock internally for 4 seconds to obtain a frequency count. This value is stored in
the EEPROM in the configuration parameter editable in menu item “8.6 System frq”.
8.13 GPS data
A 3D f10 t12 s30
When a GPS receiver (1pps and serial data) is connected and the alignment/calibration functions
are enabled by pressing the left (select) button, data from the GPS is shown on the display. The
five displayed info fields are to be interpreted as follows:
•
A valid GPS Data (V would mean invalid data)
•
3D 3D fix (could be None, 2D or 3D)
•
f10 GPS solution fix uses 10 satellites
•
t12 GPS receiver is tracking 12 satellites
•
s30 average signal strength of the 12 tracked satellites is 30.
The GPS data menu item is for display of GPS information only. It can be useful to verify that the
GPS is working properly and determine the best location for the GPS antenna, based on the
number of tracked satellites and signal strength.
4.27 Test equipment
The test equipment menu provides several items of test equipment, which can be used to
diagnose faults in your radio, and even for other testing purposes too!
The diagram below shows the connection points for the test equipment. If you are attempting to
measure external equipment or circuits, then you will also need to make a ground
connection between the CW transceiver and the external circuit.
These items of test equipment are described below. All except for the signal generator, are
display-only items, with no corresponding stored configuration parameter.