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FW: [BITX20] New file uploaded to BITX20@groups.io
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?
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?
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· #52203
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Latest Build, Mods and results.
Digital power adjustment. Several ways. Dr. William J. Schmidt - K9HZ
Digital power adjustment. Several ways. Dr. William J. Schmidt - K9HZ
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· #51917
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Latest Build, Mods and results.
Check uBITx.net. Already there. Dr. William J. Schmidt - K9HZ
Check uBITx.net. Already there. Dr. William J. Schmidt - K9HZ
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· #51904
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RF power chain mods and improvements..
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
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
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· #51869
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RF power chain mods and improvements..
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
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
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· #51758
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Auto Tuner?
Programming is all that is left. Dr. William J. Schmidt - K9HZ J
Programming is all that is left. Dr. William J. Schmidt - K9HZ J
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· #51757
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Power supply fuses
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 -
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 -
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· #51575
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RF power chain mods and improvements..
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 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
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· #51464
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Removing surface mounted resistor
#ubitx
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
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
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· #51439
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RF chain power mods and improvements
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
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
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· #51321
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RF power chain mods and improvements..
Its better to take care of this before it gets to the RF amplification section of the uBITx…
Its better to take care of this before it gets to the RF amplification section of the uBITx…
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· #51070
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RF power chain mods and improvements..
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
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
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· #51034
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New VK4PLN Audio Daughter Board + BCI
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
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
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· #50980
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New VK4PLN Audio Daughter Board + BCI
Thru holes Dr. William J. Schmidt - K9HZ
Thru holes Dr. William J. Schmidt - K9HZ
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· #50943
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New VK4PLN Audio Daughter Board + BCI
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…
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…
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· #50942
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Need Clarification on uBitx v. 4 Schematic
ALTERNATIVE Dr. William J. Schmidt - K9HZ
ALTERNATIVE Dr. William J. Schmidt - K9HZ
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· #50861
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SDR as Waterfall display
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
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
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· #50860
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SDR as Waterfall display
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
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
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· #50823
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New VK4PLN Audio Daughter Board + BCI
Holes in the corners for mounting… of course… Dr. William J. Schmidt - K9HZ
Holes in the corners for mounting… of course… Dr. William J. Schmidt - K9HZ
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· #50822
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RF power chain mods and improvements..
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
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
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· #50640
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