Category: Telecommunications

Introduction In a previous post I looked at using the PlutoSDR as a WSPR beacon (Ref.1). The PlutoSDR can be used to demonstrate standard AM Modulation as shown in Figure 1. Transmission is via a shielded sma cable plus 40dB pad to 3 test receivers: A Signal Hound spectrum analyzer, RTL-SDR and PlutoSDR receiver (Ref.2).… Continue reading PlutoSDR for AM Modulation on GNU Radio

Introduction Several years ago I purchased a compact television antenna to use on my apartment balcony to cut down on cable costs. My balcony has line of site view of the CN Tower which hosts many television and broadcasting transmitters (Ref.1). So far I have tested pretty well every antenna I have with the versatile… Continue reading ATSC Television Antenna Testing with NanoVNA

Introduction In the previous two posts I examined the Varioprop 6 R/C model airplane PWM transmit signal and simulated it in Scicoslab. In this post I test the Transmitter to Receiver link on CB Citizens Band CH19 27.145MHz and confirm correct operation of the Rudder/Elevator/Engine Speed controls. Test Setup Figure 1 shows the Varioprop 6… Continue reading R/C Varioprop 6 Signal Tx/Rx Decode_b

Introduction In the previous post I fired up my Varioprop 6 R/C transmitter and examined the transmit signal. The model aircraft control works by using PWM Pulse Width Modulation for the Rudder, Elevator and Engine Speed. There are 4 pulses; one for each control and for carrier sync. The width of each pulse is a… Continue reading R/C Varioprop 6 Signal PWM Scicos Simulation

Introduction I have always been interested in model aircraft and while on a trip to Europe in 1970, I purchased a Graupner R/C remote control plane kit. I took my time building it so as not to make a mistake. Several years later I bought the remote control gear. I never flew the plane since… Continue reading R/C Varioprop 6 Signal Decode_a