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Ok. Ive ordered 10 boards for testing. I will also try to get it working in combintation with a QRP-Labs relay board and BPF in the 30Mhz LPF spot for spur reduction. Effectively turning it into a 5

Arv, Anyone that thinks they can make a trap that works over a 2mhz range is also selling bridges.? The trap fpr 10M alone would ahve to snuff 15-17mhz. When you get to that point a band pass filter

I'll make the Gerbers available after they have been tested. These board suppliers who offer the "10 of the 100mm x 100mm boards for $2? plus scoring and shipping" may also receive a "bubble" of

Allison Thanks. That could help others who can work on things but may not have the really expensive test equipment to do final verification tests on their work. It also could to better inform those

Bill Probably depends on how much software is required versus how much room is available in the Arduino RAM space. Thoughts here run toward using frequency versus a look-up table to set PWM output

Arv, The repetition of material has reached the level of just one more time for something on the order of N>5. When I get a chance I'll put it in the fine wiki. Does anyone for spurs over 20mhz

Bill You are probably correct. I do exchange emails occasionally with Farhan but he has been quiet about what is next and when that may happen. I think he has lots of other activities going on in

Hi Arv, The real issue about those tunable traps is the raduino won't tune them. Or can it!? Much the same as a tunable preselector. Or plug-in one-at-a-time low pass filters. Doable yes. Make

Bob, Great post! Guy WB7SZI

The TDA audio ic used in the earlier uBITX was designed to be used with 32 ohm headphones. The new version 4 has a different audio output stage that should be fine with 8 ohm and possibly 4 ohm

Kees If not already done, someone needs to tell Hans that he is about to get a lot more orders for QRP-Labs filter boards. Or...are you going to make bare boards available in the same form factor so

In your case I would really recommend the BitX40 kit: Low-cost, rock-stable and FCC compliant. With a few minimal mods you can add most of the features that commercial rigs have. See

Hello Ripley, The first thing is that all this still needs to be tested to see how well it works by someone with good test equipment. Warren volunteered since he has a very nice setup and I'm sending

George, K1DX Well said ! Many of us feel the same. Benefits of this rig far outweigh the griping by others in efforts to convince others to not purchase the rig. Arv K7HKL _._

?Robert -- i see that you are in Lakeland. Isn't that somewhat in Sumter county? I thik there are a bunch of folks into emergency ham radio commuications down there. Anyway, that Alnico HF radio

Allison I have been following all the discussions but there is still some more definitive information that us neophytes might need, or think we need. When you say " *80m harmonics, use external low

Allison Interesting. I have been experimenting with resistively loading series LC traps and find that they can be made broad enough to cover some tunable spurs without seriously decreasing the

Not exactly HRO style, but makes stage matching/measuring faster and easier 8 pin dip socket ..Use another socket as a header for transformers Also, too test points? (trim off unused pins) Jim

This thread reminds me of something I've been told by hams at least three or four times in the last 38 years - and it brings up an issue that I've faced throughout those years.? Some of the posts

Hello Kees Trying to decide the best LPF filter fix for my needs between what you are doing and Gordon’s implantation. So let me play back your approach as I understand it. The LPF plug in boards