What is it?

When you building QRP-Labs LPF or BPF filters, you may want this simple and easy to use adapter to test them with your NanoVNA, VNA or SpectrumAnalyzer with TG to get the best performance out of your filters.

Why did you make it?

I had a few QRP-labs lowpass filters and bandpass filters kits laying around and because I had nothing better to do on a afternoon, I fired up the soldering station and assembled them. After that they need to be tested and tuned and owning a NanoVNA for a few months I decided to use the NanoVNA for tuning the filters. After building a simple junkbox adapter, I found out that other hamradio operators like the idea and asked I could build one for them. So I designed a nice PCB, did some rework and came out on the current design.

What makes it special?

The design allows you to simply calibrate your NanoVNA, VNA or spectrum analyzer and test / adjust QRP-labs lowpass filters and bandpass filters kits to your specification.

Note When using a NanoVNA, you can simple test components with this adapter. By directly insert the component under test into the Input socket (the top 2 sockets are ground, the bottom 2 sockets are connected to CH0 / S1). On Youtube there are some excelent video's about this topic (like this one)

Kit

Product is delivered as a kit with all components needed which requires soldering skill. But don't worry about the SMD parts, I have pre-soldered them for you.

Kit includes :

• 1 x PCB with pre-soldered SMD resistors
• 2 x 4 pin female header
• 1 x 12 pin male header (needs to be separated in 6 x 2 pin male header)
• 2 x Female 2 pin jumper
• 2 x Female SMA PCB edge connector
• 1 x 3D printed PCB Holder (Yellow PLA)
• 6 x 3D printed push pins for PCB Holder (Yellow PLA)
• 2 x bonus small SMA thumb screw

Note : Excluding the SMA coax cables, filter, large thumb crews, and the NanoVNA shown in the pictures.

Don't want to solder and start using it right away ? Checkout the Fully assembled option.

Fully assembled

Product is fully assembled and tested by me.

Note : Excluding the SMA coax cables, filter, large thumb crews, and the NanoVNA shown in the pictures.