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My idea would be to divide and conquer. First step, see if you get proper quiescent currents through the IRF510's. Put an ammeter in line with 12v supply for the IRF510's, turn RV2 and RV3 to the

Get well soon John. Listening to the top end of 40M right now and it's chock full of AM Rally stations all over the place from 7.250 to 300. I'm QRV on 7.240 for traffic and a possible substitute

I’ve been following this post. What does this all mean for a beginner who is waiting on a uBitx? Is there a problem with original design? Are these strong audio tones noticeable or interfering with

So in order to have an oscillation, you have to have a closed loop with a gain greater than one at the oscillation frequency Since your squeal begins when you turn the vine control up, and then input

I am sitting here reading some of this information and studying the new technology.? When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.?

Where did mine December 15th and got it about a week ago Andy KM4TRT

My mistake. I meant TDA2822 chip. Craig KC2LFI

Where do you have a TPA 2016 chip? The uBitx does not use that. [image1.png]

Bingo! See this ceramic resonator on Mouser:? pnum??81-CSTCE16M0VH3L99R0 Same physical size as what's on the Nano, I didn't see any quartz crystals that small. Tolerance of those Murata parts is

So, moving the Nano 8" away did away with tones in the crystal filter passband,? which would be the ones of most concern to folks here in the forum But you still see tones coming through the

OK, great! One other question...what is the relationship between the "PPM" calibration value and the "CAL VALUE" in line 43? =Vic=

Ah, very nice that you were able to do all of this, and document it so well. See my comments inline with your original text below ?

Not 100% sure but popular thinking indicates the "crystals" on smaller Arduino boards are actually ceramic resonators.? If this is true then it should be possible to use capacitence to pull them

Tilman and all, Per, I think, Raj's suggestion, I change R63 to 11 ohms, and that seems to work well. 0805 parts fit on 1206 pads, and power dissipation is not an issue with an 0805

Thanks for fast ansver, it is working. In next days try to conect to pc. if it working with n1mm. And with mmvari. This program using for digital and for contest. Use this

Not familiar with the ATMega328P, but table 9.3 on p300 of the datasheet says the Low Power Crystal Oscillator can take a crystal anywhere from 0.4mhz to 16mhz, and that we must load bits CLKSEL[3-1]

Please keep in mind that some of us don’t want a disk image and prefer a simple package to install. This way, i can just add it to a disk that is already set up the way I want my Pi to be. Thanks

Jerry My uBITX has proper 10W output on 80 and 40 meters keydown CW. So I assume the BIAS is set ok. When trying to get some serious output power (10W) running phone I have to wistle in my mike a

I am still trying to identify the cause of an audio "squeal" which makes receiver unusable. Audio is ok at lowest volume setting. As I turn up volume, a "squeal" begins and gets louder obliterating

Are T1 and T2 identical in the Bitx40? Any others? I have a spare board and my original board has a mechanically intermittent T2. I am practicing desoldering and removing these devices and will