July 31st, 2019
Upgraded Amplifier
The design is similar (CMOS buffer driving an IRF510) but I used perfboard to make this one and placed it in an enclosure. There's no low-pass filter on the amplifier itself, but I put a 30m low-pass filter in-line the coax before the antenna. It's currently outputting 20PPV into 50 ohms (1 watt).
Old Amplifier
New Amplifier
Right after hooking it up I saw my signal looking nice on the air:
AJ4VD Spotted in Ontario, Canada (VA3ROM)
AJ4VD Spotted in the Canary Islands (EA8BVP1)
Markdown source code last modified on January 18th, 2021
--- title: Upgraded Amplifier date: 2019-07-31 21:00:00 tags: qrss, circuit --- # Upgraded Amplifier The design is similar (CMOS buffer driving an IRF510) but I used perfboard to make this one and placed it in an enclosure. There's no low-pass filter on the amplifier itself, but I put a 30m low-pass filter in-line the coax before the antenna. It's currently outputting 20PPV into 50 ohms (1 watt). ### Old Amplifier <div class="text-center img-border"> [](2019-07-30-old-amp.jpg) </div> ### New Amplifier <div class="text-center"> [](schematic.png) </div> <div class="text-center img-border"> [](2019-07-31-new-amp.jpg) </div> Right after hooking it up I saw my signal looking nice on the air: ### AJ4VD Spotted in Ontario, Canada (VA3ROM) <div class="text-center img-border"> [](VA3ROM.1907311950.549006f9e5.jpg) </div> ### AJ4VD Spotted in the Canary Islands (EA8BVP1) <div class="text-center img-border"> [](EA8BVP1.1907311940.821b800321.jpg) </div>