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AUDIO-OUT JP3
Wire to the left terminal to the output of C17, and the "GND" terminal to the GND
hole at AUDIO-OUT JP3.
ANT-OUT JP2
The holes at ANT-OUT JP2 may be used when you would like to make this kit as a
pre-amp. Usually, the holes are not utilized for DC receiver operation.
THRU
The "THRU" terminals can be shorted when you would like to make sure the receiver
is working properly without the BPF functioning. With this setting, you can receive
commercial stations such as Loran before starting to adjust the BPF.
Adjustment of BPF
Once the soldering is done, make sure that there are no wrong wirings or connections.
Connect the antenna and power supply to the IDC-136-KIT and power on. Use SDR
software such as HDSDR and tune in around 137kHz. You may need to prepare a
signal generator or TX. Transmit on 137kHz with SG or TX, and adjust the two IFT's
alternatively so that received signal strength becomes maximum. If you don't have
any transmission source, you can still adjust the IFT's so the noises coming out from
the IDC-136-KIT become maximum.
Once the adjustment is done, you can enjoy listening to the 2200m band with the use
of SDR software or Spectrum Lab.
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