Low Pass Filter

The LPF really goes together with the PA, in the GQRP Scratch QRP documents it suggests building and testing them together, however I hadn’t worked out which capacitors I was going to use so I built and tested the PA and then the relays before coming back to this. In the end I used some silver mica capacitors which I purchased from Hifi Collective, they are a little pricey compared to normal capacitors, however they had the values I required so no doubling up etc required and they more than meet the requirements.

No huge issues with this build apart from removing the enamel from the wire for the inductors, burning off with the soldering iron is my preferred method, however I still struggle to get it burnt off enough and clean enough to easily solder. My connections seem decent but I feel like either I’m doing something wrong or there must be a better way, yet scraping off with a knife or using sandpaper seems slow and a bit ’iffy’.

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