Category Archives: Home Construction

Kit building, home brew projects etc.

Ultimate Labs construction (Part 2)

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I have added multi band options to the U3S recently. Part 2 of the project deals with the addition of the switched LPF relay board and additional LPF. You can read the story of the construction, thankfully without the addition … Continue reading

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Raspberry pi Zero used as a 30 metre Wspr Transmitter

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I have assembled a 30 metre low-pass filter from Language Spy (link here) and soldered header pins to the GPIO on the Raspberry Pi zero. Note that the Pi-LPF kit uses surface-mount components and provides a 7-pole Chebyshev low-pass filter … Continue reading

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70MHz operating from The Rainbow and Dove PH

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This long bank holiday weekend provided an ideal opportunity to try out the recently constructed 70 MHz slim Jim. The antenna is quite easy and cheap to assemble from either 300 Ohm or 450 Ohm ladder line. John M0UKD has … Continue reading

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Single Feed 2M and 70cm Beam plus 4M 1/2 wave mobile vertical.

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Single feed 2M and 70cm Yagi Richard Clark G4DDP I have been looking to replace the mish-mash of VHF/UHF aerials that I have on my mast at home. At the moment I have two 5 element 2M yagi’s one beaming … Continue reading

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Building the RK SWR Meter kit.

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Ron G6LTT bought a PIC-based Radio-Kits  SWR Meter kit (more info here) about 3 years ago at the same time as I bought mine.  He still hadn’t assembled it, so I volunteered to build it for him.  Pictures below…. 73 Derek … Continue reading

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A Cobwebb homebrew build by Dave 2E0DDH/M0MBD

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Whilst on the course for my foundation exam in February, I still had the word’s of John Mulye G0VEH ringing in my ears.. “Why go out and buy a load of ready-made rubbish when you can make your own with … Continue reading

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Experiments with a homemade Cobwebb type Antenna

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Over the years I have experimented with quite a few wire antennas at home increasingly to minimise the effect of the increasing noise level from the likes of plasma TV’s, switch mode power supplies, PLT and ADSL routers but fighting … Continue reading

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ADS-B with a DVB-T stick

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I have been messing around with the DVB-T SDR thing again, this time to download and decode ADS-B (Automatic Dependent Surveillance–Broadcast) signals. All aircraft transponders transmit data on 1090 MHz. The antenna used is a discone in the loft. The … Continue reading

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GPS for QRSS WSPR Transmitters

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I have assembled a GPS module to a breakout board for use with the WSPR transmitters that I have brought from  Hans Summers G0UPL (www.hanssummers.com – more info here). Delivery should be any day now :-). The GPS module, from … Continue reading

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FT-817 AFSK data interface using SMD components

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I decided to build one of the K6XX data leads using SMT. First, the circuit. Next, A nice copper clad board, begging for the hacksaw. Like a knife through butter. The Circuit design is now cut into the board using … Continue reading

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