Introduction Several years ago I received a Shortwave Radiogram broadcast (Ref.1) using the RTL-SDR and 125MHz up-converter (Ref.2). It has been 4 years so I thought I would try again. As I mentioned in previous posts, I am using an HF loop antenna due to it’s ease of setup and noise rejection & directionality, since… Continue reading HF SDR-IQ for Shortwave Radiogram
Category: Telecommunications
Telecommunications: Propagation, HF, VHF, UHF, uWave
AIS & GNSS on OpenCPN
Introduction In previous posts (Ref.1/3) I looked at using a new GNSS receiver with AIS on various combinations of Win10/RPi4/OpenStreetMap/OpenCPN. In this post I look at GNSS on full receive 921600bps with AIScatcher. Equipment Block Diagram Figure 1 shows the receive block diagram. To receive all 4 satellite constellations you have to have the maximum… Continue reading AIS & GNSS on OpenCPN
HF Marine Weather 8764KHz_USB
Introduction Further to my previous post (Ref.1), I was hoping to receive a DRM transmission on the 31m band at 1900DST/2300UTC. I used the same equipment: SDR-IQ with HF Loop antenna tuned for 9.5MHz. There were several very powerful signals but no DRM. I did receive a strong USB signal on 8764KHz which turned out… Continue reading HF Marine Weather 8764KHz_USB
HF SDR-IQ on 19m VOACAP Prediction
Introduction It’s been a while since I have monitored the HF bands, so I thought I would do a bit of scanning. In the last several years there has been a tremendous amount of construction near me and the HF noise level has increased quite a bit. I am right next to a power line… Continue reading HF SDR-IQ on 19m VOACAP Prediction
RTL-SDR for NOAA15/18/19 Satellite Weather-Summer 2025
Introduction Several years ago, I looked at receiving NOAA15/18/19 satellite weather using various configurations with a Windows 10 laptop and a Raspberry Pi4B (Ref.1/5). I also simulated the NOAA-APT transmission using Scicos (Ref.6). I thought it would interesting to revisit NOAA and try some different ideas I picked up working with Cubesats. Satellite Tracking Figure… Continue reading RTL-SDR for NOAA15/18/19 Satellite Weather-Summer 2025