This meant that lots of bits were in the way.
"I found the Trifilar coil a little tricky to solder and eventually had to solder it from the top. Mike also makes the following comments which may help other constructors: If he wishes to use the optional polyphase network module rather than the receiver in I-Q audio output mode, he just unplugs C1 and C2. Mike installed two turned-pin (low profile) headers for C1 and C2. Please ensure that you correctly orientate your BPF as shown in the following correct diagram and photograph (click to enlarge). The BPF kit PCB has "In" and "Out" written in the white silkscreen on the PCB. The error was that the BPF was shown in the diagram in section 6.1, and in the photo in section 5, the WRONG way around. The initial assembly document contained an error.
SDR RECEIVER RADIO MODULE DOWNLOAD
Printed instructions are NOT supplied with the kit. You can download the kit-building instructions for your PCB from the links below.ĬLICK HERE to download the kit-building instructions for the receiver module kit.ĬLICK HERE to download the FRENCH kit-building instructions (many thanks to Gilles F1BFU for the translation!)ĬLICK HERE to download the ITALIAN kit-building instructions (many thanks to Roberto IZ7VHF for the translation!)ĬLICK HERE to visit the BPF kit page and download instructions for the BPF module kitĬLICK HERE to visit the Polyphase network kit page and download the instructions for the polyphase network kit (if required)Įxample connections to other QRP Labs kits, to use the Ultimate3S QRSS/WSPR transmitter, VFO/Signal Generator, or ProgRock kits as the local oscillator for the receiver module. The receiver kit INCLUDES one Band Pass Filter kit for a band of your choice, from 160m to 10m.
SDR RECEIVER RADIO MODULE GENERATOR
The module is sized 80 x 37mm, exactly the same as the Ultimate3S QRSS/WSPR transmitter kit and VFO/Signal Generator kits, so that it can be bolted behind these modules if required.
SDR RECEIVER RADIO MODULE PC
The module is designed to directly drive a stereo input sound-card. For those situations where a PC has only a mono input (many PCs are like this, particularly laptops), there is an optional polyphase network plug-in module kit which cancels the unwanted sideband and produces a single sideband (SSB) output. The audio output of the module is isolated using two 600:600-ohm transformers to reduce or eliminate the ground loop problems which can easily occur in SDR systems. This could be generated by the QRP Labs Ultimate3S QRSS/WSPR kit, the VFO/Signal Generator kit, or ProgRock kit. The receiver requires a local oscillator (LO) input at 4x the receive frequency. Low noise LM4562 op-amps are used in instrumentation amplifier configuration to provide excellent common mode noise rejection. There is a transmit/receive switch onboard. The receiver board has a socket for the standard QRP Labs Band Pass Filter kit.
The mixer is arranged as a double-balanced mixer for maximum performance. This high performance receiver module uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector. The kit includes one BPF kit (choice of any band 160m to 10m). It has 600:600-ohm audio isolation transformers at the output are used to reduce ground loops that often occur in SDR systems. This is a high performance SDR receiver module, with I-Q audio output.
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