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He comes away with the chassis, switches and pots, and the RF inductors and crystals from the PCB. Unexpectedly there is a huge bank of crystals rather than the frequency synthesiser that would have been standard only a few years later. It’s an interesting study in the evolution of radio design, as an entirely analogue design of mostly discrete components is revealed.Ĭareful inspection of the photographs reveals a Fairchild uA703 5-transistor IF amplifier chip in a metal can, but that’s about as high-tech as it gets. Delving into aged electronics is right up our street! An IF amplifier was high-tech back in ’75.Ī possibility for a 27 MHz CB rig is to convert it to the neighbouring 10 m amateur band, but since these were all AM rigs, a mode that sees very little amateur use, it was better to part them out. was lucky enough to score a box of old CB radios at a garage sale, and takes us through a teardown in search of parts he can use to make a QRP amateur radio rig.
#Wxtoimg no audio indicator tv
Scouring a panel from a dumpster-find TV for the right resistor may now be a thing of the past, but it’s not entirely dead. With the easy and cheap availability of parts by Internet mail order, it’s easy to forget that acquiring electronic components was once a more tedious process, and it was common to use salvaged parts because they were what you had.
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Continue reading “What Will You Do With An Extra 1.2 Gigahertz?” → Posted in Interest, News, Original Art, Radio Hacks Tagged 6ghz, 802.11, 802.11ax, wifi, wireless In practice this means that there will be a whole new set of WiFi channels created, and we’ll all have a little more spectrum to play around with, so it’s worth examining in a little more detail. This allocation process is likely to be repeated by other regions worldwide, freeing up another significant piece of spectrum for unlicensed usage. In the last few weeks there has been a piece of routine American bureaucracy that flew under the radar but which will have a significant effect on global technology the United States’ Federal Communication Commission first proposed, then ratified, the allocation of an extra 1200 MHz of spectrum in the 6 GHz band to ISM usage. While our collective minds have been turned towards the global pandemic it’s refreshing to hear that in some quarters life has continued, and events that would have made the news in more normal times have continued to take place while they have been replaced in coverage by more urgent considerations. If you’re curious about the transmitter there’s a video thread following its restoration, and if the guts of older radio gear interests you then take a look at this aircraft receiver lovingly brought back to life.Ĭontinue reading “Pulling A Crystal By Grinding It” → Posted in Radio Hacks Tagged am, crystal, radio, Top Band At the end of the video, we see a QSO on the transmitter itself, which is something of an oddity in an age when AM on amateur bands has been supplanted by other modes for decades. We’re taken through the process of getting it close to frequency, but sadly don’t see the etching that he uses for the very last stage. He then ground it down with very fine grit on a glass plate, reducing its mass and thus its resonant frequency. picked a crystal as close as he could find below the required frequency. He modified the oven to take a socket for older FT243 crystals because the quartz element can easily be accessed. He documents the process of modifying a crystal oven and moving a crystal frequency in the video below the break.Ī crystal oven is a unit containing the crystal itself alongside a thermostatic heater, and in this one, the crystal was a 1970s-vintage hermetically sealed HC6 device. modified a 1950s broadcast AM broadcast transmitter for the 1.8MHz amateur band, and his friend thought it needed its crystal back for originality rather than the external frequency source had provided. Use an LC oscillator and put up with drifting in frequency, or use a crystal oscillator, and be restricted to only the frequencies of the crystals you had. There was a time though when synthesizers were impossibly complex and radio amateurs were faced with a simple choice. A phase-locked-loop frequency synthesizer or a software-defined radio will generate your frequency, and away you go. If you own a radio transmitter, from a $10 Baofeng handheld to a $1000 fancy all-band transceiver, setting the frequency is simply a case of dialing in where you want to go.