After getting curious about vacuum tubes, nixie tubes, and later on vacuum flourescent displays (VFDs), I decided to go and give driving a VFD a shot. It seemed simple enough as I didn't need to use high voltages.

Being that I drive a 1/4 tonne pickup (ford ranger), the horn is rather weak and "car" sounding. To fix that, I gave my pickup a voice -- that voice being an air horn from Amazon. This is how the installation went.

The previous cascode design was insufficient, so I redesigned it with much better results.

When testing the 20m superheterodyne reciever, there was a lot of noise generated by the previous frontend amplifier design, so I have decided to re-design the frontend amplifier. In this approach, I utilize the cascode configuration.

To amplify the IF portion of the 20m superheterodyne recievers signal chain, I though I would give the W7ZOI and K3NHI's termination insensitive amplifier design a try.

Still unsatisfied with my crystal filter, I decided to order some 8 MHz crystals. This decision ended up producing the best crystal filter for the reciever.

For the 20m superheterodyne reciever, I need two mixers for the RF-IF stage and IF-Audio stage. My initial diode ring mixer design functioned as intended, but this time I chose to make it more compact and to use different diodes. ~ I also built two this time.

With the new crystals characterized, I take on a new approach to designing a crystal filter.

To effectively build a Crystal filter, I characterized the new 4 MHz crystals I ordered. Using two methods, the NanoVNA-H with DiSlord firmware, and the G3UUR method.

After a dissapointing first attempt, I redesigned the crystal filter again. This time using a slightly different approach.