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Nice job Allison. My PA print is about the same size, 2.5 by 5 inches and that includes one corner 1.5 by 1.5 " cut out to leave access to the BFO/AF mixer below and also 2 reasonably big heatsinks of

I once played with an AOR7030 on AM at Anil's QTH. It blew my mind. Synchronous AM detection is certainly something. - f

0 pf is 'no pf', that is, it is open. Take out the capacitor. It has been placed on the circuit to be used if needed with PA transistors with higher gain like the RD16HHF1s, etc. - f

It's really tough to make a 0pf cap (or 0 ohm resistor) that is accurate to within 1% Or 100%.

Separate universes.

Final could be weeks, still waiting for Allison's intermediate comments on changes. I suggest you leave the rig stock unless you are keen to do your own development. First thing I would experiment

A bit ambiguous, but I believe Allison is suggesting you might want to leave those 0.1uF caps at C261 and C262 in place, as they were originally. And while you're at it, she suggests leaving those

Is there a best and final solution yet or are we still waiting for Allison's final comments on changes?

Yes, it's recommended you put the two pads in separate rooms. Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/ http://www.metalworkingfun.com

That's a cap, so the zero means 0pf.?? Be sure to place the two PCB pads infinitely far apart.? ;-) Farhan is disabling the negative feedback around the IRF510's.

Last time I built a bitx20? PA I use a strip of copper clad (2sided) and it was about 2" by 5"? input at one end and the PA transformer at the other.? everything evenly between.? I still have it

those are .1 uf caps, pass rf block dc.? Says so in small print on the schematic. That is the negativefeed back to keep the mosfets tame at low hf.? Without the cap its full on forward bias likely

My favorite AM radio is my Hallicrafters SX100 or the highly modded S120 of for just being odd ball my really old (1953) RCA am potable AC/DC/battery using tubes.? ;) I still wish I had the old RBO

I made the changes listed for the PA of changing R97 and R98 to 220ohm. I thought the change of C261 and C262 meant going to a 0ohm jumper but when I made that change the PA now immediately starts

Using SSB radio for AM RX is fine I do it all the time.? Using it for TX not so much as AM nets sort frown on it. Building AM rx is fun in it self. Allison

I listen to AM stations all the time with the ubitx! It's not high fidelity but if you zero beat the station on SSB it is good copy, even on shortwave! Sounds at least as good as the AM stations in my

Hi Don, Thank you for confirming this! I purposely asked the questions as uninformed as possible. I was assuming the best sound would be zero beat but given the fact that this uBitx has thrown me a

Jerry, Its not that much an issue as the current result is lower than normal power. Just something to think about.?? I t could be an add using a second cpu to manage on a separate add on board.

Looks like the software has a bug.? I experienced the same thing during the alignment.? The display shows, say 1.080.00 (1080 on the AM dial). When I tune to a lower frequency, the frequency should

Farhan, I'm keenly aware of volume lock in and pricing to build.? I looked at the data sheet BFR93. Using the V3 schematic for Q10, Q20 and Q90 that is a good smt part.? Maybe for?the predriver as