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While attempting to get digital working on my ?Bitx, I had the plugs from the Easy Digi mislabeled. The line from the computer audio out was plugged into my speaker jack. I discovered my error and

Please check the section titled "Don't use these Band Pass Filters as a transmitter output filter!" on the BPF kit page http://qrp-labs.com/bpfkit 73 Hans G0UPL http://qrp-labs.com

I couldn't get the error to show it's ugly head under testing last night. I tried antenna, dummy load, & multiple bands. Perhaps I fixed it while changing something. If it happens again, I have a good

How much power could handle the Bandpass filters by QRP Labs? Could they be used just adding them in line between the Ubitx and the antenna to attenuate the TX spurs on 15m and 12m?

Stick with the TDA2822, it works fine. Of the TDA2822 types that the uBitx shipped with, only the WX clones blew at anything less than 15v. If you drive a low impedance speaker (4, maybe 8 ohms) at

I've worked with computer buses since the early '70s.? Most buses get standardized about the time they become obsolete.? Trying to set a standard simply forces people to look elsewhere for something

"...stuff that arrived on a slow boat from China, and some of the most fragile stuff was packed in a wad of bubble-wrap in a plastic bag..." All of us who have bought anything from China have seen

The overdrive occurs in the audio drive to the mixer.? There is no gain control for the microphone. I found on my board that the gain was too low. You can look at the mixer input with a scope and see

As Carl said, this kit was packed incredibly well. I was surprised to see the plastic box inside the package, to be honest. I've ordered a LOT of stuff from overseas, including all too much stuff that

Spurs are generated in mixer stages. Overdriving your audio can increase the amplitude of those spurs. It can also generate 3rd order IMD products. Adjusting RV1 down won't help with the spurs but it

Thanks for the concise explanation! As for overdriving your audio, is this something that can be solved by dialing down RV1 to reasonable levels, or are the spurs created before that stage?

There are 2 possible solutions... #1 Transmit a signal -- Such as the "beeper" The FOX TANGO CLub (FT101) had back in the 1970's it was a small tone board that they sold installed in the base of a

John If you search this list you will see that lots of us got a SMD cap with the BITX40 and never really figured out what it was for.? The best guess anyone had was there was discussion at one time

Chip, ?I am sure that *in case you tried CW mode, you might have placed 4.7K resistor from +5V to the key wire as suggested in wiring diagram. please check whether that resistor was not accidentally

iT SURE LOOKED GOOD in the ad :-)? The basic idea is great, but I knew some tweaking/redesign would be in order.? Plus, it would be expensive to implement. Thanks for letting me know!!! Ron W7HD --

Rahul: Good to know. Failures are learning experiences, too. Jack, W8TEE

Glad you back safe and sound Joe. Have you posted the cad files anywhere that we can look at them. 73" allen -- Allen ?Merrell

Thanks Rick for the reply, I have that document and my measurements are close. Chip

The radio *does* work. In each of your video's you had no problem tuning in stations. The stations sounded perfectly fine to me, I was able to copy them with absolutely no problem, even when you

Thats fine, use a 16 ohm speaker and it will run cool!