This gallery contains 9 photos.
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
This gallery contains 3 photos.
The Helitron DV4mini dongle has been used at my QTH running with a windows tablet as a hotspot for both DMR+ and D-Star. A spare Raspberry Pi2 has now been used with the Linux(ARM) version of the DV4mini software, downloaded from here. … Continue reading
This gallery contains 11 photos.
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
This gallery contains 4 photos.
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
This gallery contains 9 photos.
My Raspberry Pi arrived earlier in the week from Farnell. Below some photos. Debian distro has been loaded for experiments with APRS (running Xastir and using “squeeze”). The HDMI monitor on the right is a 47″ screen. 73 Derek M0XDC Email: … Continue reading
This gallery contains 8 photos.
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
This gallery contains 10 photos.
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
This gallery contains 10 photos.
I have modified my older Baofeng UV-3R (Mk1) to implement the LPF mod. See links at the end for further information. A small SMT 0402 sized 33pF capacitor is added… Before opening the case. … Continue reading
This gallery contains 4 photos.
I was having a lot of RFI problems with the W4RT OBP board, so I have now created a Faraday cage around it. More testing soon and an update with the results… First insulate the board (photo above) Then wrap … Continue reading
This gallery contains 6 photos.
I been looking at one of these for a while, well a couple of years. I have just purchased a W4RT One Big Punch and installed it into one of my Yaesu MH-31 microphones (I have two of those). John G1DJI is kindly going … Continue reading
