Can someone take a stab at getting chromium to work with the soundloop? We can use webrtc to relay audio
On Fri, Apr 21, 2023, 7:46 PM Evan Hand < elhandjr@...> wrote: Hi Scott,
I tried the input mapping command, and it works like a charm.? Thanks!
I am still trying to get the Sbitx application to start reliably.? I continue to get ALSA error messages on startup.? I have attached two error log files I captured.? Any more suggestions?
Thank you again!
73
Evan
AC9TU
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Hi Scott,
I tried the input mapping command, and it works like a charm.? Thanks!
I am still trying to get the Sbitx application to start reliably.? I continue to get ALSA error messages on startup.? I have attached two error log files I captured.? Any more suggestions?
Thank you again!
73
Evan
AC9TU
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Re: ARRL Frequency Measuring Test
Very interesting, how accurate was the sbitx with the tcxo? - f
FYI, last night, after I demonstrated the sBitx DE with V2 software to members of the Dayton ARA (DARA) TNG*, ?Tom Holmes (N8ZM) and I used it to participate in the ARRL Frequency Measuring Test.
During the test, after a 3-minute call-up, the source station transmitted a 1 minute carrier near (but not on) the call-up frequency. There were two transmitters: K5CM in Texas and W8RKO in Ohio (about 20 miles from us). Each transmitted ?once on each of 40 an 80.
We used a BNC tee to feed the antenna and the output of a HP 8920 Service Monitor to the input of the sBitx. We adjusted the output of the service monitor to be similar in strength to the transmitting station. During the one-minute carrier period, we adjusted the frequency of the service monitor output to zero beat the carrier (by ear). We reported the frequency of the service monitor.
*TNG - Thursday Night Group: This is a group of tech-oriented hobbyists who meet most Thursday evenings at the DARA clubhouse to work on various projects. The clubhouse has an array of test equipment.
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73,
Mark, N8ME
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ARRL Frequency Measuring Test
FYI, last night, after I demonstrated the sBitx DE with V2 software to members of the Dayton ARA (DARA) TNG*, ?Tom Holmes (N8ZM) and I used it to participate in the ARRL Frequency Measuring Test.
During the test, after a 3-minute call-up, the source station transmitted a 1 minute carrier near (but not on) the call-up frequency. There were two transmitters: K5CM in Texas and W8RKO in Ohio (about 20 miles from us). Each transmitted ?once on each of 40 an 80.
We used a BNC tee to feed the antenna and the output of a HP 8920 Service Monitor to the input of the sBitx. We adjusted the output of the service monitor to be similar in strength to the transmitting station. During the one-minute carrier period, we adjusted the frequency of the service monitor output to zero beat the carrier (by ear). We reported the frequency of the service monitor.
*TNG - Thursday Night Group: This is a group of tech-oriented hobbyists who meet most Thursday evenings at the DARA clubhouse to work on various projects. The clubhouse has an array of test equipment.
--
73,
Mark, N8ME
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No audio on the loopback device
I realized that after closing fldigi, and open it again, there is not input signal in the loopback. It seems like the loopback is being closed or getting stuck somehow. Anyone experiencing this?
Rafael
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Hi Evan,
That¡¯s really good news. ?I will give that a try. ?My fingers are crossed. ?Thanks!
I do have a work around on the touch screen input. ?After the RPI boots, run:
sudo xinput map-to-output ¡°raspberrypi-ts¡± ¡°DSI-1¡± .
It¡¯s an extra step to perform after boot but it works. ?I¡¯ve thought about adding this into the boot sequence but just haven¡¯t sorted where that is and made the addition.
I¡¯ll let you know how it goes.
Cheers, Scott
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Re: SBitx: Capacitor across gpio's tx line
Further investigating the TX line, I noted a 470 ohm resistor across C66.? This would put a 7ma load on the GPIO pin.? Adding the PIN diode switching 74LS08 adds another 4ma, so we are at 11ma with a maximum of 16ma recommended.??
There are 5 other loads that I did not do the calculation.? A buffer seems to be a good idea for this particular output.? Still, no problems in 400 units go against needing to make a change.
73
Evan
AC9TU
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Re: SBitx: Capacitor across gpio's tx line
Farhan,
Thank you for the answer.? I thought it was for RF issues.? The only potential issue that I thought for removing the capacitor was slowing down the TX return to off would potentially cause the TX and RX to be enabled simultaneously for a very short period.
400 radio sample is a pretty good test showing that there is not an issue.
73
Evan
AC9TU
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Btw, I would advise not to use my fork, unless there is a need to. Ashhar main repo it the way to go, and his "build" script will work for all common use cases.
Rafael
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On 4/21/23 10:37, Rafael Diniz wrote: Just type:
make
make install
All the rest of the instructions are exactly the same, as described in install.txt.
Rafael
On 4/21/23 01:06, jacobs@... wrote:
Rafael,
Can you give me the commands that I need to install your fork? I¡¯m new to Linux and trying to learn how to do this myself. Thanks.
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Bob AA4FJ
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Re: SBitx: Capacitor across gpio's tx line
Evan, There is a very slow switching needed. I consulted my notes, the cap was installed to prevent tx latch up when the RF was getting in the TX line. In our four hundred plus radios tested by now, we haven't faced any issue related to the capacitor. However, I am removing it my own radio to see how it works. - f
On Fri, Apr 21, 2023, 1:03 PM Evan Hand < elhandjr@...> wrote: Hi Gary,
Thank you for the links.? They do provide more information than what is on the Raspberry Pi site.
I still do not understand the issue with C66.? None of the documentation lists a maximum capacitance load.? Some of the examples given in online recommendations suggest using capacitors to help reduce contact bounce, which leads me to believe that it is not that C66 is too much of a load on the GPIO output.? That means there is a circuit issue that I do not understand.
73
Evan
AC9TU
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Just type:
make
make install
All the rest of the instructions are exactly the same, as described in install.txt.
Rafael
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Show quoted text
On 4/21/23 01:06, jacobs@... wrote: Rafael,
Can you give me the commands that I need to install your fork? I¡¯m new to Linux and trying to learn how to do this myself. Thanks.
--
Bob AA4FJ
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Re: SBitx: Capacitor across gpio's tx line
Hi Gary,
Thank you for the links.? They do provide more information than what is on the Raspberry Pi site.
I still do not understand the issue with C66.? None of the documentation lists a maximum capacitance load.? Some of the examples given in online recommendations suggest using capacitors to help reduce contact bounce, which leads me to believe that it is not that C66 is too much of a load on the GPIO output.? That means there is a circuit issue that I do not understand.
73
Evan
AC9TU
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Re: SBitx: Capacitor across gpio's tx line
@Garry: thanks info
@Evan: I found two links that might be useful:
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Gyula HA3HZ
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Rafael,
Can you give me the commands that I need to install your fork? I¡¯m new to Linux and trying to learn how to do this myself. Thanks.?
--
Bob AA4FJ
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Re: SBitx: Capacitor across gpio's tx line
Sorry to ask a stupid question, but what is the issue with C66?
It may not be a good design to delay TX to Q5 and the rest of the TX use points, but not sure it could cause damage.? I would be more worried about the many devices that use the unbuffered TX line.? GPIO guidelines say 16ma total.? Not sure what the total pulsed current would be on the TX start.
73
Evan
AC9TU
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Re: Help: uBitx V3 parallel 4 MHz narrow CW filter and firmware changes?
Thanks Mark,
That's helpful and I'll start looking at it in the weekend. I got a reply from Alex, PA1FOX as well, but he used fully custom firmware and has also built the radio from scratch!
I've got the 'simple' version, just the LCD. If I get something working I'll report back (could take a while...).
73,
Gerard
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Re: SBitx: Capacitor across gpio's tx line
On Thu, Apr 20, 2023, 11:56 AM HA3HZ < gyula@...> wrote: I can't find it on the schematic.
Which capacity is it? Cx
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Gyula HA3HZ
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Re: SBitx: Capacitor across gpio's tx line
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Re: SBitx: Capacitor across gpio's tx line
I can't find it on the schematic.
Which capacity is it? Cx
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Gyula HA3HZ
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SBitx: Capacitor across gpio's tx line
I have lost an email that someone wrote to me about the capacitor that is directly across the tx line of the gpio. I agree that it is a bad design, we will take it out in the next revision. It hasnt blown anyb of the 200 already tested with raspberry pis installed, but it needs to go all the same. Thanks to the gentleman who wrote in. - f
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Mark Erbaugh
HA3HZ