Introduction Recently I received an interesting question from Scott in Vancouver about Marine Channel 70 and DSC Digital Selective Calling. DSC is a part of the GMDSS Global Maritime Distress and Safety System (Ref.1/2). It can be used by ships on the MF/HF bands or in the VHF band. The ship MMSI identifier can be… Continue reading RTL-SDR for Marine GMDSS/DSC on MULTIPSK
RTL-SDR for FT8 on MULTIPSK
Introduction In the last few posts (Ref.1/4), I examined the WSJT-X protocols FT8 & WSPR using the RTL-SDR, HRF1 and PlutoSDR. In this post I will look at receiving FT8 using the RTL-SDR and MULTIPSK (Ref.5). MULTIPSK is an incredibly versatile Ham Radio software program that has recently added FT4rx, FT8rx & WSPR to it’s… Continue reading RTL-SDR for FT8 on MULTIPSK
PlutoSDR for WSPR Beacon on GNU Radio
Introduction In the previous three posts, I looked at WSPR & FT8 as part of the WSJT-X protocol suite (Ref.1/2/3). In the last post, I tested the feasibility of using the HRF1 as a WSPR beacon. In this post I look at the possibility of using the PlutoSDR as a WSPR beacon. PlutoSDR specs indicate… Continue reading PlutoSDR for WSPR Beacon on GNU Radio
HRF1 for WSPR Beacon on GNU Radio
Introduction In the previous two posts, I looked at FT8 & WSPR, as part of the WSJT-X protocol suite (Ref.1/2). Using simple antennas like a 5m wire hanging from a tree and an Alex Magnetic loop, I was able to receive signals at extremely low SNR’s. I had only experienced reception under these conditions using… Continue reading HRF1 for WSPR Beacon on GNU Radio
RTL-SDR for WSJT-X FT8
Introduction In the previous post I looked at receiving WSJT-X WSPR using the RTL-SDR (Ref.1). Normally I place my HF antennas outside on my balcony, but due to renovation construction this is not available to me. So I used an Alex Magnetic Loop antenna inside pointing out of the balcony window and even with this… Continue reading RTL-SDR for WSJT-X FT8