Mike I believe this is precisely what I have been suggesting from my first post. It is not the CW keyer per say rather the need to turn on the transmitter X ms prior to the first CW character reaches the Transmitter input port (Lead-In Timing) and on the Exit the (Tail Timer) time Y ms after the last CW character prior to shutting off the transmitter and another short time Z ms to create a signal to turn on the receiver.
This technology really goes back a ways in history as the "collective we" have forgotten how spoiled we (collective we) have become with the advent of transistorized radios. Now in the Age of the computer or "Software Defined Radio" all perviously insignificant timing events now have to be coded into the operational software. The physical amount of time may be very short but remember in the Computer Driven World even the smallest amount of dead air time has to be part of the Operational Software Code.
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Re: sbitx, turn off TX audio.
I thought CW mode showed the Side Tome too. Not at the radio to test that.
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Okay, I tried it and that does work well.? Ran with the default 30 and 0 then switched to JS8Call.? In the sbitx app you have to be in FT8 mode to see the Sidetone menu.
Thanks
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Re: sbitx, turn off TX audio.
Okay, I tried it and that does work well.? Ran with the default 30 and 0 then switched to JS8Call.? In the sbitx app you have to be in FT8 mode to see the Sidetone menu.
Thanks
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Re: sbitx, turn off TX audio.
On Thu, Oct 31, 2024 at 08:52 AM, Kevin wrote:
I was using mine at a campsite with quiet hours and every time that I muted the volume through the OS it would unmute during transmit.? I muffled the speaker slots with a towel and quickly muted every time JS8Call transmitted.?
I could have opened it up and unplugged the speaker but it was dark, windy as heck, and I didn't want to accidentally drop something.? I'll probably wire a speaker kill switch but for now I've found that just plugging in headphones does the trick.
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Just set the sidetone to 0.
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?
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Re: sbitx, turn off TX audio.
I was using mine at a campsite with quiet hours and every time that I muted the volume through the OS it would unmute during transmit.? I muffled the speaker slots with a towel and quickly muted every time JS8Call transmitted.?
I could have opened it up and unplugged the speaker but it was dark, windy as heck, and I didn't want to accidentally drop something.? I'll probably wire a speaker kill switch but for now I've found that just plugging in headphones does the trick.
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Re: sBITX 64Bit Pi Image Available
#sBitx
I'm glad that I asked.? Thank you.? I'll refrain from switching.
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Re: NBFM (Was: AM on sBITX?)
I/Q is one way. Here is a simpler way:
1. The signal is essentially AC.
2. Mark the exact time at which the signal transits from positive to negative.
3. This measures the time period of every crest and trough of the signal. 4. When the signal frequency is low, the time periods are lengthier. When the signal frequency is higher, the time period is smaller. 5. The time period is our demodulated signal. - f
The frequency differentiation method would be able to approximate the phase difference by using consecutive I samples. But the demod product would probably be pretty crappy at best.
I think that the transform method should at least be able to simulate a phased Q sample which may be a bit better as a starting point. I messed with this a while ago when I was offloading a synthetic IQ stream to SDRAngel.
it almost worked, but I lost interest in the challenge..?
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Re: NBFM (Was: AM on sBITX?)
Hi Rafael,
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Thank you for the links!
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I have had a setback with my DE, so I cannot try this until I repair the low-power problems.
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73
Evan
AC9TU
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Re: NBFM (Was: AM on sBITX?)
Hi Evan,
I maintain this fork of it (just compilation fixes):
and packages for arm64 (run on any 64 bit image):
- Rafael
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On 10/31/24 10:00 AM, Evan Hand wrote: Hi Rafael,
Thank you for the feedback.? I will look into it.
73
Evan
AC9TU
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Re: NBFM (Was: AM on sBITX?)
Hi Rafael,
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Thank you for the feedback.? I will look into it.
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73
Evan
AC9TU
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Re: NBFM (Was: AM on sBITX?)
Do it does not require I/Q. It works pretty fine indeed, already tested.
: )
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On 10/30/24 9:43 PM, Evan Hand wrote: Hello Rafael,
I believe that the csdr libraries require an I/Q (90-degree phase shifted) signal.? The sBitx does not have that available unless code is written to do the Tayloe decoding in software. That could be easier than what I am suggesting.? I do not have the skills to do that from scratch.
I just got my DE working again, so I will try my suggestion after I have upgraded the software to JJ's 64-bit version.? That may be a couple of weeks as I do not get much radio time with the support needs of my wife after knee replacement surgery.
73
Evan
AC9TU
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I will post the website name only if i wont get into trouble with the forum. HI HI
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just the name? and no .com,or .org etc
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73
David
ac9xh
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Tomasz
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Good info. I just found a 4 inch tft unit same as the one we all receive from hfsignals but only in a 4 inch screen. i ordered one and going to connect it. probably will have to alter some code i imagine .doubt i get lucky that its plug and play. might give it its own regulator for power .depending on the current draw after hooking it up
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D-FLIFE High-Quality 2.4"/2.8"/3.2" /4.0" RGB TFT Touch Screen Module with White LED Backlight, 240x320 Dots, 5V/3.3V Compatible, for Arduino R3/Mega2560 - SPI Serial Interface, 6-Hour Standby Time
?ILI9341
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Has the exact pin designations on this one so it will be easy to hook up. Pins are on same end too. didnt bother reading whether the pins on this one line up with the display on the ubitx.
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73
David
ac9xh
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Re: sBITX 64Bit Pi Image Available
#sBitx
On Wed, Oct 30, 2024 at 09:28 AM, Kevin wrote:
I'm curious if this choice will impact the sbitx app.
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Please do not switch to Wayland Compositor as it will reconfigure some things on the Pi making it unusable for some. The new 64 bit image I am working on will include WC after further testing.
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Re: sBITX 64Bit Pi Image Available
#sBitx
I switched and saw no issues and/or differences! As it says it is easy to switch back.
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Re: NBFM (Was: AM on sBITX?)
The frequency differentiation method would be able to approximate the phase difference by using consecutive I samples. But the demod product would probably be pretty crappy at best.
I think that the transform method should at least be able to simulate a phased Q sample which may be a bit better as a starting point. I messed with this a while ago when I was offloading a synthetic IQ stream to SDRAngel.
it almost worked, but I lost interest in the challenge..?
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There was a commit on 8 July called "Merging the CW keying time lag fix". Did you notice any improvement?
Mike
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For the CW operators here ... have you had any problems with the sBitx CW
keyer?
The timing seems off for me when keying at higher speeds, and the TX isn't
quite right even using an external keyer. I took a couple of videos showing
what I mean:
Using an external keyer at 25 wpm, the dits are much more staccato than they
should be and sometimes entirely cut off. The TX is bad enough that the RBN
will not pick up my call when using the external keyer:
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Re: sbitx, turn off TX audio.
On Wed, Oct 30, 2024 at 3:46?PM William Hemmingsen via <lee.hemmingsen= [email protected]> wrote:
Is there a way to turn off the TX audio when running ft8, wjst-x etc?? It's not controlled by volume and annoying.
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Re: NBFM (Was: AM on sBITX?)
Hello Rafael,
?
I believe that the csdr libraries require an I/Q (90-degree phase shifted) signal.? The sBitx does not have that available unless code is written to do the Tayloe decoding in software.? That could be easier than what I am suggesting.? I do not have the skills to do that from scratch.
?
I just got my DE working again, so I will try my suggestion after I have upgraded the software to JJ's 64-bit version.? That may be a couple of weeks as I do not get much radio time with the support needs of my wife after knee replacement surgery.
?
73
Evan
AC9TU
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Re: sbitx, turn off TX audio.
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VE6LX
Kevin