What I've Been Up To Lately

By JonathanGuthrie, 15 April, 2015

It's been a while since I've put anything here, but I've been busy the whole time.

I received a Peaberry SDR V2.0 kit as a gift, and I've been assembling it. I've gotten to the point where the entire receiver is built and works, and I'm working on the transmitter. I'm building the 20, 30, 40, and 60 meter version of it, if anyone cares. At some point, I'll have to find a nice Linux SDR application I can use it with. Up to now, I've just be using the recommended Windows application because it's recommended. I want to control the uncertainties in any project I do.

I have also been working on using SDR to act as a receiver for FO-29. I had a 70-cm quadrifilar helix already. To it, I've added a cheap Chinese low-noise amplifier, and a 5v power supply to power it. I've also modified one of my RTL-SDR dongles to have an SMA connector and I've been putting SMA connectors on the end of RG-58 coax. I know RG-58 is high loss at 400 MHz, but there's only 15 feet of it, so I'm not too awful worried. The LNA I got is just an LNA. There's no protection in it or anything to switch it out of the circuit if you attempt to transmit using the antenna, so this antenna is receive only, and I had to build a regulated 5v supply for it. On the other hand, it only cost $20 with shipping, so I'm not unhappy with it. It seems to work, but I haven't quite got the software working with it yet.

I haven't been neglecting antennas, either. I've come up with an idea for a multiband end-fed half-wave antenna that I think might work.

Anyway, that's what I've been up to. What have you all been up to?