Another HiFER Beacon
AA7EE
by AA7EE
5M ago
I haven’t been building much at all, for quite a long time now. However, the urge occasionally returns. When it does, it’s wonderful to have a small stash of parts on hand, so I can pull the soldering iron out and start building before the desire dissipates. I’ve been interested in beacons for a while, and this interest has followed a logical progression. I first noticed that my interest in talking with other hams over the air using phone (i.e. SSB) was waning. During this time, I would still check in daily with the Noontime Net on 40M (now on 7284 KHz). A quick check-in to a net was fine, and ..read more
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A Passive Tunable HF Preselector
AA7EE
by AA7EE
2y ago
When I built the VE7BPO DC Receiver Mainframe recently, it wasn’t intended to end up as a final finished project. The intention was more to have it as part of an experimental platform. The little box that contains the DBM, diplexer, and AF amplifier that make up the mainframe will most likely stay largely the same, now that they are built and boxed up. However, the outboard functions of local oscillator and antenna filtering can swapped around and changed at will. The mainframe includes a spot for an onboard plug-in bandpass filter. It was constructed so that the bandpass filters from QRP Labs ..read more
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The VE7BPO Direct Conversion Receiver Mainframe
AA7EE
by AA7EE
2y ago
This is one of those projects that has been residing in my head for a long time, as something I wanted to build. I’ve always liked direct conversion receivers. With them, as with regens, I felt that they have been underestimated by many builders and hams as being novelty items. Their apparent simplicity can also be their greatest downfall. Because, in their basic form, they often have few components, they can be “thrown together quickly”, in an evening, by a novice builder. That, of course, is where the problems start. The high degree of audio amplification necessary in a DC receiver lends its ..read more
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Rod KQ6F Has A New SW200 AM Processor For Sale
AA7EE
by AA7EE
3y ago
Please note that the above photo is of my SW200, though Rod’s no doubt looks exactly the same.   A few months back, I received this note from Rod KQ6F – Hi Dave – I very much enjoyed your review on this product.  It was largely the reason I bought one.  My application is AM ham radio and as such found some of its features to be unnecessary.  I defeated the AGC and the pre-emphasis and found the triband limiting overkill since all my audio is voice and therefore all mid-band.  So bottom-line, I have no further use. My unit is S/N 024, is only a few weeks old, and is still in factory-fresh ..read more
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Putting The HiFER “BRS” Boris Beacon On The Air – Finally!
AA7EE
by AA7EE
3y ago
In this post from May of last year, I detailed the construction of a 1mW solar-powered HiFER beacon. I named it the Boris Beacon, in tribute to my neighbor’s cat. The beacon was never mounted permanently outside. I kept it indoors, powered from a small solar panel in the window, and feeding an “antenna” of sorts, consisting of the original dipole wires folded up into two small bundles. Obviously, I had no serious intention of it being heard by anyone; I just liked having it come on every day when the sun came up, and transmitting until later in the day, when the light was too low to sustain op ..read more
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The C Crane Skywave SSB Portable Radio
AA7EE
by AA7EE
3y ago
This will be a very brief post, and in no way constitutes a review. It’s barely even an “initial impressions” type of post. It’s just that I’ve been wanting a C Crane Skywave SSB for a while now, recently purchased one, and wanted to tell you! I’m sure many readers will identify with the search to find the perfect tool/gadget/product. We are, of course, not looking for genuine perfection, but for a tool that comes as close to fitting our personal needs as we think we are going to get. I went through this process a few years ago with cameras, after becoming a bit tired of lugging my DSLR and as ..read more
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Guest Post – N6JJA’s WBR-Oscar Regen Receiver
AA7EE
by AA7EE
3y ago
Back in May of this year, Sheldon N6JJA began sending me information and details of his version of N1BYT’s WBR regenerative receiver. It went through several iterations, before ending up at the final version as shown here. Even this version is still a work in progress – as all good products of experimentation are. Sheldon took the original WBR circuit, as described by N1BYT, and made a few changes. Firstly, he added a preselector. Regens are well-known for having poor strong signal performance. A pre-selector can’t help with very strong signals close to the received frequency, but it may well ..read more
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The K7TMG HF Morse Code Temperature Beacon
AA7EE
by AA7EE
3y ago
This was a fun little project – and it gave me an idea for a future one. Sometimes, I find that the more complex undertakings, which require more planning, can get to the point that they “take me over” somewhat. At that point, for me, some of the fun starts getting squeezed out and that, of course, absolutely cannot be allowed to happen. This is the time when simple and fun projects save the day. QRPp beacons have been a “thing” of mine for a while now, ever since I put the Sproutie SPT HiFER Beacon on the air, sending it’s 12 wpm SPT ID out continuously on 13558KHz, with a mighty 4.6mW to a m ..read more
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