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Troubleshooting
The Easy TR switch is intended to be easy to assemble and should operate without any problems.
However, if it fails to operate, there are a few things to check:
Check the board for cold solder joints, these will appear rough rather than shiny. If in doubt, reheat
connections to ensure a good connection.
Check for any solder bridges or solder whiskers that may short between adjacent pads
Verify correct location and orientation of the diodes D1 and D2 as well as the transistors Q1 and Q2.
They should be oriented as shown on the PC board outlines.
Verify that power and ground are connected to Pads 1 and 4 of X1.
Test by connecting Pad 2 of X1 to ground with 12 power applied to Pin 1. You should be able to hear
the relay click. If not, recheck components and solder connections as indicated above.
When applying RF to the TX input, you should hear the relay click. If possible, test at 7-10Mhz first to
verify function and if not working at low or high frequencies, increase or decrease the value of C1 and
retest.
Capacitor C1 is part of the RF sensing circuit that controls the automatic TR switching.
The kit is supplied with a 47pF capacitor for C1 and for most HF applications, this will work well.
For very low frequency use, (~3MHZ or below), using the included 100pF or larger capacitor may
improve switching performance
For high frequencies (~ 25MHz or above) 22pF or even less will usually be sufficient.
Switching performance for power levels below 1 Watt may be improved by larger values of C1
Some experimentation may be required to find the optimal capacitance for your specific application.
If you still experience problems, or have any questions, please contact us at
qrpkits.com@gmail.com
and we will be happy to assist you.
Easy TR Switch 20170209
8
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