Re: Harmonic performance - SSB vs CW
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I’m using this one https://www.ebay.com/itm/192131587815, but it’s only because I have a 150W amp after the uBITx inside the same box. It’s smaller than the uBITx though and has a directional coupler on board. I would think, as others have mentioned, Hans’s QRP-Labs modules would work as a good starting place for those looking for a cheap alternative (https://www.qrp-labs.com/lpfkit.html). They are quite good and $4.60 each band. I’ve used them a lot..hard to beat. There are some other QRP radios that have good outboard filter boards that are excellent too…Kees has some kits that are very well designed. The one at HFProjects.com is pretty good too…
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of m5fra2 via Groups.Io
Sent: Monday, August 6, 2018 11:39 AM
Subject: Re: [BITX20] Harmonic performance - SSB vs CW
Which after-market board is that? I would like to keep any new boards in the same case.
Colin – M5FRA
“rip out the filters and the relays and even the TR relay (KT1-3 and K3) and route everything to an external low pass board. “
Yup, done, works… gains almost 30bd in suppression with a good/cheap after-market board.