[Amps] low pass filter fail ;)

[Benedikt Sveinsson]

I have been building a 2M SSPA - final part in the puzzle has been the low pass filter.

After building this filter, copied the design from W6PQL - but I have limited resources here in TF land, so I don't have access to good PCB materials. But the filter was measured using a mini VNA Pro analyser with good results.  1:1.2 SWR on the operating frequency and cuttoff starts around 150Mhz

well, after transmitting about 10s I noticed a drop in output power, I took the cover off and aimed the camera while transmitting

This is what happened on youtube:  https://www.youtube.com/watch?v=9lU3I3BgmkE

I suspect there is something else wrong, as this happened very fast 10-15s - and solder melts!

Guess I will go and find teflon sheets and make my own capacitors with copper ;)


73, Benni TF3CY