Here’s a pic of the 6m prototype. Firstly, I printed my own T50-0 toroids; secondly, you’ll note the T50–6 in the BPF; thirdly, you’ll note the binocular is not the glossy 43 mix rather a BN61-202; and, lastly, the Tx phase splitters is also a T37-61.?

Output transformer is wound for 12V as a Really Weird Twisted Sisters Transformer (search for my previous posts in io).?

Attached:

Design schematic for LPF

Analysis of design.?

Implementation

Pic of prototype?

T50-0 printed toroids

T37-17d can be used:

Input L 10t T37-17

Trap L ? 9t T36-17

BPF L 11t T69-6?

BPF C ?22pF

Measurement:

Rf Filter sweep ?

6m

8m

TinySA both done with 35dB in-line

6m spectrum - quite good.?

8m spectrum the 8m spectrum is borderline

?but after more squeezing/splaying of LPF turns may improve harmonics