Testing a homebrew direct conversion dual-band side WSPR transceiver 30 yards. WSPR is so narrow bandwidth digital slow speed that can be decoded, even if the signals are below the noise level. WSPR takes 2 minutes to send two words. It's too slow for the purposes of the conversation that is increasingly used as a signaling system to test the propagation and research. WSPR milliwatts can be decoded thousands of miles and the drivetrain is needed is very simple as shown in this video. Thetransceiver that connects to a laptop, only four transistors. One of them is the crystal oscillator, one to the receiver's audio amplifier and two in the pilot of the issuer and the final. The balanced modulator is used as a detector device and the receiver uses two diodes IN4148. This is a very memory. The concept is similar to the platform W3PM (see website below), but only double-sideband (SSB not) and use the manual transmission / reception switching. The receiver is prone to false pointsand requires more work (probably because of interference from the computer.) However, the transmitter works very well, reports indicate that long distance. Anyone wishing to build something like that should start with the design W3PM transceiver for well designed, but simple, with good performances (link below). This project was inspired by an article in the Soldersmoke podcast / blog WSPR OSD. Even better is that 30 meters was the activity around a frequency which was in the glass...

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Here is my vintage Ameco AC-1 Ham Radio novice CW transmitter on 40 Meters at about 5 watts output, along with my homebrew receiver and station controller (keyer and TR switch). If you are not familiar with this vintage novice rig, google search and you will find some interesting information on it. The AC-1's signal is being monitored in the shack for this video with a Kenwood R-1000 receiver - my homebrew receiver has only headphone audio output right now. As you can hear, my AC-1 produces a clean and stable signal. Hope you enjoy the video!! 73, Jack WA6KYO RECEIVER INFO: I've been getting questions about my homebrew receiver. It is a simple solid state direct conversion type with two separate audio filters for added selectivity. It's basic, but actually works quite well on 40 meters. The metal box above the chassis and just behind the National Vernier dial is the VFO and is extremely stable. I will make a video demonstrating the receiver soon. For more info on the AC-1, including partial replica kits, decals, coil forms, etc... there is an AC-1 Yahoo Group: groups.yahoo.com Here's another great AC-1 page: www.qsl.net Looking for more info on homebrewing your own replica? Original instruction manual, schematics and parts list information can be found here: www.qsl.net

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