Dual Gate MOSFET Investigations – Intermodulation
A look into the intermod properties of a BF991 amplifier.… Read More Dual Gate MOSFET Investigations – Intermodulation
Tag: amplifier
Homebrew 20 Watt Linear Amp
QRP is tons of fun on CW, but it gets a bit rough trying to work other stations on SSB with 5W, especially when you are using antennas that are low to the ground. I had been eyeballing the nice RF MOSFETs from Mitsubishi for a while, and since I got a hankering to get… Read More Homebrew 20 Watt Linear Amp
W8DIZ 5 Watt CW Amplifier Analysis
I finally got the proper binocular ferrite cores that I needed to build the W8DIZ 5 watt amp correctly. You can see my previous post on this amplifier here. In my last post, I noted that I was seeing some strangeness in the drive level circuitry. I found that I had a very bad connection… Read More W8DIZ 5 Watt CW Amplifier Analysis
W8DIZ 5 Watt CW Amplifier
A few days ago, W8DIZ made a post on qrp-l.org announcing a new addition to his RF Toolkits line. This one is a 5 watt CW amplifier using a push-pull 2SC5739 pair as the PA (my new favorite full QRP gallon transistor). I built my own version of the circuit using parts that I had… Read More W8DIZ 5 Watt CW Amplifier
Dual Gate MOSFET Investigations – Gain and AGC
Having determined some basic characteristics of the biasing of the BF998 dual gate MOSFET in a previous experiment, it was now time to look into the gain and AGC performance of the amplifier. A few changes were made to the original circuit to turn it into a proper RF amplifier. Test Equipment Power Meter: M3… Read More Dual Gate MOSFET Investigations – Gain and AGC