So I already own the box…. 1. Will the board be available separately? and, 2. When do you suspect it will be available for sale? From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of BITX20@gr

Digital power adjustment. Several ways. Dr. William J. Schmidt - K9HZ

Check uBITx.net. Already there. Dr. William J. Schmidt - K9HZ

Pretty much... you and i are on the same page. I use a little different PA transformer (61 material because ive found it to be more efficient) but otherwise basically the same. Dr. William J. Schmidt

I have made roughly the same mods after simulating them in LTSpice and can confirm almost identical results/ power levels. Dr. William J. Schmidt - K9HZ

Programming is all that is left. Dr. William J. Schmidt - K9HZ J

Reversing diodes shorting/ blowing fuses and diodes in series with power leads, brute force, works but is quite unnecessary. See more far more elegant solutions at ubitx.net . Dr. William J. Schmidt -

I guess i don't understand where you are going with the software... but wouldn't it be easier to convert your display work from the I2C buss? Then you have a whole host of pins to work with... freed u

I use a sharp awl to break them in the center easily. Then remove each end. Those parts are extremely cheap. Dr. William J. Schmidt - K9HZ

#ubitx

I put one of my Rigol spectrum analyzers on my uBITx this weekend before traveling and i can report pretty much the same as everyone else has seen. Im particularly interested in the performance on 10

Its better to take care of this before it gets to the RF amplification section of the uBITx…

Well… the IF filter daughter card is a good retrofit solution but the move to a 70+ MHz IF is a more permanent solution and OK with the right parts. For now, the daughter card can go right in at TP1-T

Not sure I agree with this being the wrong part for a preamp in the uBITx. First I always design in a front end high pass filter on my preamps…(that should be a fairly obvious requirement for any prea

Thru holes Dr. William J. Schmidt - K9HZ

Hey what about a preamp for 6-15 meters? I have a nice design for one using a PGA-103+ … only 12 parts if you include the bypass relay…

ALTERNATIVE Dr. William J. Schmidt - K9HZ

BTW on transmit you get the transmitted signal spectrum. Quite nice! (I do reduce the gain on transmit!). FreqShow runs on a Pi… needs to be moved to a Teensy. Dr. William J. Schmidt - K9HZ J68HZ 8P6H

So I’ve actually done this… I used this SDR: https://www.adafruit.com/product/1497 which tunes down to 24 MHz. I tapped into the uBITx IF at TP14 on the rev4 schematic… before the 45 MHz roofing filte

Holes in the corners for mounting… of course… Dr. William J. Schmidt - K9HZ

I didn’t say there would be a lot of power, but it does work… and the most obvious answer is a fifth filter. Dr. William J. Schmidt - K9HZ