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EK-1A 3 Band CW QRP Transceiver kit 2014
Assemble manual
EK-1A 2014 3 Band (40m, 30m,20m) CW QRP transceiver kit is easy to build, it has SMD finished by the
factory. There are 2pcs of PCB, the main board and display board. To guarantee the building success, the
display board and main board have been assembled and tested including the MCU, LCD and DDS.
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Table of Contents
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Summary of Contents for YouKits EK-1A
- Page 1 Assemble manual EK-1A 2014 3 Band (40m, 30m,20m) CW QRP transceiver kit is easy to build, it has SMD finished by the factory. There are 2pcs of PCB, the main board and display board. To guarantee the building success, the...
- Page 2 EK-1A 2014 part list Name Description Mark Encoder Volume adjustment 1K with on/off AF/SW Volume adjustment Q9 mounts Battery socket Power jack PHONE、KEY Headphone jack I-inductance 10uH Electrolytic capacitors 470uF C15, C39 Electrolytic capacitors 100uF C27, C28 IF Transformer T1 T2...
- Page 3 3 cores need to made by builder: Magnetic inductance L1: please use yellow enamel insulated wire, about 20cm, make 12 turns. Magnetic inductance L2: please use red enamel insulated wire, about 20cm, make 10 turns. As above. T1 transformer is 8:2, please use red enamel insulated wire, about 15cm, make 8 turns as primary. Use yellow enamel insulated wire, about 6cm, make 2 turns as secondary.
- Page 4 Notice： 1. Please notice the direction of Relay K1, must follow the direction on PCB，also the direction of Electrolytic capacitors C15,C27,C28,C39, never install them in wrong direction. 2. K1, LED, R30, PHONE are all installed at back side of PCB, please check below pic. 3.
- Page 5 Plug your headphone to phone jack, put signal generator to ANT, put generator with a 5uV signal, adjust frequency to 7.100Mhz or close to this frequency, put EK-1A on same frequency, now adjust VC to receive a 700Hz beat frequency, then adjust T1,T2 to max the receiver sensitivity.
- Page 6 DDS Calibration DDS has been calibrated in factory, if a calibration is needed, please follow below: 1. Power off, press and push V/M/SAV and RIT/SET then power on, showing below on screen then release these two buttons. 2. Waiting for 2 second, display change to below. Put your frequency counter to DDS testing point, the pad close to R27.
- Page 7 30M band MOD 30m band only has RX at factory default, if you need 30m TX, connect “A” (right side of R4) on front display board, then you have 40m 30m 20m RX and TX. Youkits 2014-12-06...
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