Jeremy Clark – Page 5 – Telecommunications, Navigation & Electronics

RTL-SDR for Satellite Weather-Meteor M2-3/4

Introduction Recently I received a notice that NOAA15/18/19 transmissions were coming to an end (Ref.1). Over the past several years I have enjoyed monitoring these transmissions (Ref.2). However from reading various Newsgroups, it appeared that satellite weather was still available on the Meteor satellite family M2-3 & M2-4 (Ref.3). So I set about trying to… Continue reading RTL-SDR for Satellite Weather-Meteor M2-3/4

Celestial Navigation – Artificial Horizon_b

Introduction In a recent post I looked at adapting an artificial bubble horizon to my sextant using a 3D printed bracket. I calibrated the combination with a water horizon on Lake Ontario (Ref.1). In this post I look at taking measurements of the Moon altitude on Sept12th & Oct5th using the artificial horizon from my… Continue reading Celestial Navigation – Artificial Horizon_b

NanoVNA for 137MHz Satellite Weather BPF+LNA Testing

Introduction In a previous post I tested a 433MHz BPF + LNA for its frequency response or S21 (Ref.1). In this post I will test a 137MHz BPF + LNA for the satellite weather band. Recently the NOAA15/18/19 satellites were decommissioned, so I wanted to know if my existing BPF/LNA could accommodate other weather satellites.… Continue reading NanoVNA for 137MHz Satellite Weather BPF+LNA Testing

Celestial Navigation – Artificial Horizon_a

Introduction The addition of an artificial horizon to a Marine Sextant allows measurements to be taken when you don’t have a water horizon nearby. I purchased an Artificial Bubble Horizon and adapted it to fit on my existing Sextant. The mounting slot on the Horizon was the mirror image to the slot on my Sextant,… Continue reading Celestial Navigation – Artificial Horizon_a

HF SDR-IQ for Shortwave Radiogram

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