X1: Control and Power input
Pin 1: V+; Pin next to X1 label on board, connects to a 12 Volt supply to power the TR switch.
Pin 2: K; External keying control line. Ground this pin to key the TR switch manually.
Pin 3: B: Bypass control line. Ground to disable switching.
Pin 4: Ground for power, control and key signals
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, with an antenna or dummy load connected to the output you should hear the
relay click.
Capacitor C1 is part of the RF sensing circuit that controls the automatic TR switching.
The kit is supplied with a 22pF capacitor for C1 and for most applications, this will work well. In general, a larger
value capacitor (47 or 100pF) may improve switching at low power and low frequencies (<1Mhz).
If you still experience problems, or have any questions, please contact us at
be happy to assist you.
Easy TR Switch V3 20171212
7
1
2
3
4
V+
K
B
G
X1
Содержание Easy TR Switch
Страница 8: ...Schematic Easy TR Switch V3 20171212 8...
