N9SGG DOT NET

Recently, I put together a raspberry pi3 and an RTL-SDR V3 receiver. Pictures to follow.

Using a RTL_SDR device I did a RF survey from 100Mhz to 1 Ghz and created heatmaps of the results. Here they are ,,,, Taken in Appleton Wisconsin

WLOD is back on the air WLOD is now very different from the analog transmitters used thirty years ago. Now everything is digital up to the FM transmitter. After that it goes out over the air. The studio and transmitter are at my house. The server is in the cloud hosted on an AWS server…

I went to visit the VLBI antenna near Cedar Rapids, IA one afternoon and took pictures. Here they are.

So, I need to conduct an RF survey of a ground site. The survey’s purpose is to determine if there is any QRM in the area of a ground site receiving UHF radio signals for GNSS with RTK radios. What is QRM? It’s an amateur radio shorthand for man made noise encountered when trying to…

This is a SpeedGoat! Isn’t it just so cute? Anyway, it’s a mascot for a company that develops hardware used in real-time testing that is supported by Matlab and Simulink. Pretty neat, eh?

This log periodic antenna is in Cedar Rapids, IA and is on the location of where Arthur Collins started his radio business. It’s one of the original plants that built shortwave radios and is part of the ham radio club there. It is very large.

This article is the first in a series, documenting my journey building a Tayloe Demodulator as an HF radio receiver. This article focuses on a Spice simulation of a Tayloe demodulator. The schematic shown in Figure 1 was created with LTSpice, a well know Spice circuit simulator and schematic capture application. I recommend it. Simulation…