Dual Gate MOSFET Investigations – Intermodulation
A look into the intermod properties of a BF991 amplifier.… Read More Dual Gate MOSFET Investigations – Intermodulation
Category: Design
Si5351A Investigations Part 7
Here’s the post I know that a lot of you have been waiting for. Buzz around the Si5351 has been picking up at a pretty rapid clip over the last month or so, but a lot of homebrewers have been hesitant to use it in their designs because one critical parameter has not yet been… Read More Si5351A Investigations Part 7
For Noontime Net
I’ve been working on getting the little bugs out of the Si5351 SSB rig and making improvements to the circuit. Since SSB QRP operating can be a bit more challenging than CW QRP ops, Dave AA7EE suggested that I think about a speech processor IC to use in place of the op-amp microphone amplifier. He… Read More For Noontime Net
A Prototype for a Si5351-Based SSB Rig
Now that I think I’ve fairly well determined that the Si5351 is suitable for use in a ham radio transceiver, it seems like time to put thought into action and actually try to build one. Ever since discovering that the Si5351 can output multiple independent clocks from one IC, I thought it would be neat… Read More A Prototype for a Si5351-Based SSB Rig
Si5351 Libraries and Breakout Board
A few exciting developments here on the Si5351 front. First off, I took the C code from my Si5351 library for avr-gcc and converted it to an Arduino/C++ library, which you can find here. It replicates the functionality in the avr-gcc library, but makes it quite a bit easier to rapidly implement designs. I’ve tested… Read More Si5351 Libraries and Breakout Board
Si5351A Investigations Part 5
The Si5351 library for avr-gcc that I’ve been promising for the last four posts is finally in a state where I feel comfortable releasing it, so I’ve posted it on GitHub. I think that the documentation posted on the README file and inside the code should be enough to get you going, but if you… Read More Si5351A Investigations Part 5
Si5351A Investigations Part 4
I’ve got a lot of project ideas rattling around my head. Got even more of them in my notebook. One of the projects floating around in there for years that seemed pretty cool, but not urgent, was an automated thermal chamber for oscillator stability testing, roughly based on the one seen at the end of chapter… Read More Si5351A Investigations Part 4
Si5351A Investigations Part 3
Since the previous Si5351 Investigations post, I’ve made quite a bit of progress integrating the Si5351 into a grabber receiver. First, let’s look at the grabber receiver architecture and how the Si5351 is used in it. Above you can see the basic block diagram of the receiver. The front end has two switchable plug-in bandpass… Read More Si5351A Investigations Part 3
Si5351A Investigations Part 2
It has been another productive weekend with the Si5351 here in the shack. Since the last report, I’ve made significant progress in confirming that the Si5351 may be a good candidate for use as a LO in a radio. After getting the most basic communications with the Si5351 going via the Bus Pirate, my next task was… Read More Si5351A Investigations Part 2
Wideband Transmission #1
This is the first in a series of blog posts covering a wide variety of topics. In the past, I have used Twitter for my microblogging needs. For a variety of reasons, I’m on a Twitter hiatus right now, so I’ll be using this series to convey some of the disconnected (and possibly connected) random… Read More Wideband Transmission #1