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Gordon, Good catch on the filter with the feed end being "the other end". Looks like a plan and has enough of a shot to accomplish the desired? goal of clean enough. Allison

Glenn, Good idea about using the HK-41F-12V relays, they are quite inexpensive (<$0.50 on ebay). The contacts are silver and if you want redundancy you can go with the HK-19F-12V relays which are

Gordon, That looks ideal, many will be reluctant to deal with removing the relays from the board. If we give up on the 15m,12m,10m bands due to the (45mhz-FOp) spur, that means all we need is two

Hi Jerry --- I don't think you were addressing ME, but I just proposed about the same thing on a slightly larger board. From my photographs and examination of the board, it looks pretty easy to make

That -43dB rule is generous, should be easy enough to meet. And with thousands of QRP devices out there, the cumulative effect s significant. Warren's spectrum analyzer screenshots show trouble,

AND... It will be hot switching... 73, Bill KU8H

Correction read 2N4427 not the number above as good equivalent for the 3866 in the same TO39 can.

Seems there are some that don’t realize that “the law was made for man, not man for the law.” There are those that won’t solder a mic connector or PL-259 without permission of the FCC. On the

Looks promising. I see the three relays you added, the three large rectangles in a column down through the center of the board. As you know, we need an easily built scheme such as this to have three

Those are great ideas, and I might use that kind of a thing for something completely different.

I wanted simple, small and easy to build. Only needs to drive A-D input, so no buffering required and linearization can be done in software if desired. I'm only interested in 30 mHz and 10W QRP max,

Iz oos, Some do some never even thought of it.? The Anan users tend to be very fastidious and? a lot of them use the adaptive feedback (distortion error correction).? Very clean as an example of

Put decent RF devices in uBitx and then we compare for sure... Rahul VU3WJM No, better devices made it more noticeable.? ?There are issues tied to board layout and lacking filters.? Fix them and

Hey, I'm just curious how all the other portable radio compare.... Are they :"clean"? Specs can be that "special" radio, just for testing. Your mileage may vary, Jim W0CHL Read the specs.? If they

Larry, my case but I expect yours as well, it is not the carrier but the unwanted sideband. << First as this is not the first time dealing with this, experience is from many prior radios and the

Tom: So, for the time it takes the hardware to figure out what frequency you are at you maybe out of compliance until the filter switches? Howard

Tom: I think there are a lot of readers here who will be interested in your work. To reduce a POF (point of failure) for those who use the sketch, I'd like to suggest you modify the #include

Switching audio in K3 was inviting pain.? I'd advise cutting traces to m1/m2 and and bridging them pls add the pop fix.

Joe, I suspected its a Brune bridge.? Most of the other forms tend to be larger. All the ones I've built C3 has to be variable or hand picked as its hard to predict due to parasitic circuit

Is this bitx-40 or bitx20 or uBitx? as they are not the same? Since it happens with the loop I'd suspect its the radio.? I say that? as people will run off and blame the endfed half