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Warren That sounds like a simple fix. It possibly could be made with RF switching to select which filter is in use. Arv _._

Did it make the board any lighter, Allison? It certainly made the thread 'lighter'! :) 73 Dex, ZL2DEX

Why not look at using balanced line instead of coax? Seems many of the issues you are talking about disappear when balanced line is used.? -- 72 and God bless KD4EPG

I lifted a top side trace at the IRF510 and soldered a wire on the bottom side of the board between the existing solder points of the coil and final. You can back up on the traces and attach to the

Rahul, The LCL preselector is one I've tried.? The show stopper is the 500pf dual capacitor and the 4 switches.? Works as shown but bulky. That is also a three part and the third has an interesting

Warren: Can you post your scaled values for the 20m filter? Also, what voltage rating is appropriate for the caps? Thanks, James

Lol, there is still an AGC board hovering around the Chicago area between Chicago USPS and Chicago USPS Regional Facility Chicago IL International Distribution Center. Guess by now that package has

My external filters constructed with values from the article.

Tasa YU1LM has something of interest. http://yu1lm.qrpradio.com/BP%20FILTER%20HF-YU1LM.pdf Rahul VU3WJM

What about installing these https://www.qrp-labs.com/bpfkit.html?as switchable bandpass filters at the wiper of RV1? -- N5KBP

This page contains three simple filters that were used to augment the internal filters of the Softrocks RXTX which suffered similar harmonic issues. I have built all three filters plus one with scaled

A suitable one made by Bourns is available from Digi-Key. Their part# is PEC11R-4020F-S0012-ND and I've used these with my various uBITX radios since day 1. Not terribly expensive either, I believe

Can anyone give me a pointer on where I can purchase a replacement encoder for the Ubitx Thanks 73 art - n2ajo

Yes, I keep trying to forget the yahoo mess. There are a few there most I unsubed from.? The only ones there of interest is EMRFD, COSMACELF (1802 cpu), R2PRO. There are a few other with high noise

As a daughter board it would fully replace the back half and its a non-trivial effort. It could be done in? the same width but the depth would have to grow. Ways to make it smaller would be careful

Oops, the photo!!! JR

My latest build, using a? Context Engineering (Fry's Electronics) case.? It's a tight fit and not for the beginner.? I had to "mill out" (dremel) areas for the stand offs.? We also chopped

I realized this early when the uBITx first came out. It was a very easy fix to simply decommission the filter networks on the uBITx, use an external filter network that accepts 4-bit binary band code

Allison and Scott Thinking old-school raises the question about using a broadband transformer to raise the MOSFET output impedance up to around 5K and then use a Pi-network as was done in ancient

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