G4FRE RADIO BLOG

My previous attempt at building a 35MHz to 4.4GHz signal generator here  had been thwarted by  a fake chinese chip recorded   here . Fro...

Having seen the Apache-labs version of the PIHPSDR I wanted to customise it to fill my needs, so I needed to assemble my own All the neede...

Running the VIA from the rechargeable Eneloop cells from the VIA was tolerable for a while, but the batteries had to be extracted from the b...

I had seen the specifications for this Austin QRP Club Vector Impedance Analyser kit when it was first announced. It covered 1 to 150MHz or ...

Last Summer, browsing ebay, I found a Kalmus 172F wideband amplifier. "Kalmus broad band vhf power amp model 172F High gain 200 watts...

This week I started work on my my triband 28V 4/6/2m amplifier using a Kalmus module I got off ebay. It needs a PIC controller which runs of...

As the winter is approaching it was time to think LF again. When I bought the main parts for the MF amplifier from Dave G0MRF at the HF conv...

Having got the signal generator from ebay seller  ayanhu81  running it was time to measure Phase noise. I decided to start at the low freque...

A few weeks ago I uncovered the Rotator and the control box for my KR600RC Rotator. Connecting it together and powering it up resulted in a ...

Although I have a portable signal generator using the SI570 that can get to 200MHz I needed something that goes a...