Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- BITX20
- Messages
Search
|
Re: Board Map/Layout, Test Points? (V5)
I don't remember, Farhan has ever released board? layout or its photo Sarma? ?vu3zmv On Tue, 26 Mar 2019, 10:49 pm ronmhauser via Groups.Io <ronmhauser=[email protected] wrote: New Question:? I have the high res PDF schematic, and I have been searching around to see if I can find a high resolution board layout or graphic.? Is this out on the web somewhere?? |
|
Re: Reverse Polarity Protection.
I would agree, as I too had a reverse polarity issue.? For me it was a left over HP power brick; HP has for some reason reverse polarity on the barrel connectors.? I forgot this and plugged it in.? Never got to turn on the rig, as the power supply crow bar shut down the power supply.? Would have fried the rig if I had not wired up the diode as listed in the wiring directions.? The only thing I would add is make sure you have a fuse in line upstream of the diode.? This is really critical if your supply can provide more than 3 amps, and does not have a crow bar shutdown circuit.
73 Evan AC9TU |
|
Re: Shaking my head in disbelief....
Kelly Mabry
?Well after a few hours of teardown and reassembly, I salvaged the encoder and the board. It tunes flaky, tends to jump around, very sensitive tune rate....I also was able to hear wwv on 5 mhz. It does not jump in and of menus.
I have my Carolina windom connected to the ubitx, and am hearing strong signals, but not many so I am encouraged only slightly.? Next step is to relax, and fix the volume control..tomorrow.? At least it works and sounds like a radio! 73, Kelly K5AID? |
|
Re: Second Nano @ i2c for spectrum, meters, CW-decode, etc
Hi, Mike.
Thanks for reaching out.? I'll check out that YouTube tutorial; it's possible that I've seen it though a silent demo doesn't always reach me. I want to know why we're doing one thing instead of another that seemed OK but wasn't. I'll look you up and give a ring Wed. afternoon or evening, hopefully. Tnx agn & 73. Ted K3RTA |
|
It sounds like a good idea would be to buy a spare Arduino to play with. I have a couple so I have a going one, and one to fool with.
That is, I could play around with it before I hooked my uBitx V5 power up backwards :( Now I'm just trying to get it fully going again. (It now has the reverse polarity installed!) |
|
Pat Anderson
Yes, already tried that. The Raduino unplugged powers up with the USB cord, no black squares, just a blank yellow display. I tried compiling and uploading the Blink example, and same result, the system messages say " programmer not responding." So, I am guessing there might be an issue with the bootloader on the Arduino, but this is pretty much beyond me at this point, and I don't want to try anything that might brick the Radiuino, assuming it is not already bricked. Pretty sure I did not do anything that might have bricked it. This all started when I had finished the assembly and on first power on got the black rectangles, which I found on the forum other people have had the black rectangles as well, and then I found on Arduino forums the same thing had occurred on Arduinos not used for radio. On those other forums, it seemed the consensus was that the bootloader was missing or corrupted. That is where things stand today. Don't really know if my bitx-40 assembly was good because without the Raduino I cannot tune it. On Tue, Mar 26, 2019 at 6:30 PM <dendad51@...> wrote: It sounds like the Arduino is blank or dead. Can you unplug the Arduino from the Raduino board and just load "Blink" to it to check ti is ok? |
|
Reverse Polarity Protection.
I recommend you do install reverse polarity protection.
My v5 board now has a 1.A polyswitch and a reverse diode. I wish it did earlier!! For some reason, I thought I'd put that mod on later, and of course, just after getting it fully calibrated, I plugged the 12V gell cell battery in the wrong way around :( I've replaced the burnt track feeding the power amp, Q15 and the 5V reg on the control board. It sort off works, but has lost sensitivity and clarity so I think a mixer is suspect. So far, I've not figured out what is wrong. So, put the reverse protection on FIRST!!!!! |
|
Re: Mic distortion
The 0.001 mfd bypass at the microphone cartridge was sort of standard way back in the early days of BITX.? It worked then, so should be something to try now. Arv _._ On Tue, Mar 26, 2019 at 4:41 PM Martin Potter <ve3oat@...> wrote: I wonder if an RF by-pass capacitor (disk 0.01 uF) at the mic connector would do the job.? Anyone tried that? |
|
Re: Mic distortion
Another question, what mic are you using?? A dynamic mic would need to be connected through an preamp or compressor and isolated from the electret bias voltage.
I found the stock mic to not have enough drive, so added an amplified mic, and verified that I was not over driving the rig. 73 Evan AC9TU |
|
Re: Mic distortion
Is the problem only with the amp connected?? How is the signal running "barefoot".
Since you have another receiver, I would load the uBitx without the amp into a dummy load and verify the signal with your Kenwood.? If that does not have the distortion, then would check the linearity of the amp or the SWR between the uBitx and the amp. I also had issues with distorted audio when I had a miss adjusted BFO.? Put the output right on one of the edges of the filter, causing high frequency cut off on one end, and excessive carrier on the other. I have read some posts where multiple pots with relays were used to adjust the drive setting based on band selection.? As long as you shielded the connections with appropriate RF cables, I would think that you could have a switch with a resistor/pot to change value of drive. Again, these are my experiences and ideas, yours may be different. 73 Evan AC9TU |
|
Pat Anderson
Martin, thanks, but the current problem is not the black squares, it is trying to upload Allard's sketch to the Raduino. The current error message is "programmer did not respond." Not a contrast issue! Scratching our heads over what it is!? On Tue, Mar 26, 2019 at 3:50 PM Martin Potter <ve3oat@...> wrote: Sorry if I missed your answer some where, but did you try adjusting the little blue Contrast pot on the back of the Raduino board??? ?It isn't labelled but is the only one there. |
|
Martin Potter
Sorry if I missed your answer some where, but did you try adjusting the little blue Contrast pot on the back of the Raduino board?? It isn't labelled but is the only one there.
When I first powered up my v5 board, the Contrast pot needed a small adjustment to get a readable display, otherwise black squares. |
|
Pat Anderson
I understand what you are saying, and would agree if I were using Windows or Mac. I am pretty confident it is not a problem on my computer end...Linux does not use "drivers" the way Windows and Macs do - everything going out a USB port in Linux goes out using the dialout device, /dev/tty. When the user is a member of the dialout group, and there is an FTDI or Prolific (even counterfeit) chip on the other end, a /dev/ttyUSB0 device is created, which is then made read/write with chmod. Linux is remarkably un-fussy about what the chip is. Whatever the chip in the Raduino is, it does not seem my computer is not having a problem with it. Whatever the chip is in the Raduino is, /dev/tty is? recognizing it and creating the USB device on? the computer. The IDE knows the USB device is there, and I am making it read/write, which has always worked for everything else. Thanks for the input though. I think I may j just set this aside for a while and come back to it later. On Tue, Mar 26, 2019 at 1:22 PM <johnbahun@...> wrote: If you are unable to upload ANY code to the processor - it is likely a problem with the serial port and/or driver on your computer.? This issue is always a black eye with new setups.? Some Arduino boards use FTDI devices and others use CHD devices.? It seems that most of the Chinese clones are using CHD340/341 devices. ? HTH |
Ted
to navigate to use esc to dismiss