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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.
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..?
Re: sBitx CW keyer problems and idea for solution #sBitx #sBITX_v3 #cw #firmware

 

There was a commit on 8 July called "Merging the CW keying time lag fix". Did you notice any improvement?

Mike


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:
Re: sbitx, turn off TX audio.

Marshall Harrison
 

Turn down the side tone.

Marshall Harrison,?
W4MKH







On Wed, Oct 30, 2024 at 3:46?PM William Hemmingsen via <lee.hemmingsen=gmail.com@groups.io> 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.
Re: NBFM (Was: AM on sBITX?)

 

Hello Rafael,
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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.
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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.
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73
Evan
AC9TU
Re: sbitx, turn off TX audio.

 

Thanks
Re: sbitx, turn off TX audio.

 

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Set sidetone to 0

From: BITX20@groups.io <BITX20@groups.io> on behalf of William Hemmingsen <lee.hemmingsen@...>
Sent: Wednesday, October 30, 2024 12:46 PM
To: BITX20@groups.io <BITX20@groups.io>
Subject: [BITX20] sbitx, turn off TX audio.
?
Is there a way to turn off the TX audio when running ft8, wjst-x etc?? It's not controlled by volume and annoying.
sbitx, turn off TX audio.

 

Is there a way to turn off the TX audio when running ft8, wjst-x etc?? It's not controlled by volume and annoying.
Re: esp32 vs Raspi Pico

 

the unit I am making iof for 2m or 6m right now so I have to use the si5351


On Wed, Oct 30, 2024 at 10:32?AM Ricardo Suarez via <elu9da=gmail.com@groups.io> wrote:

The Raspberry pi pico.?

Programmable i/o pins can generate frequencies from 0 to 30 mhz without use SI5351 or AD98xx dds even in quadrature for tayloe mixers....

Rick LU9DA

El 30/10/2024 a las 13:38, Richard Neese via 别蝉肠谤颈产颈ó:
What is the preferred?board between these 2 for building a vfo ?

Re: esp32 vs Raspi Pico

 

I have used PIO on the PICO and noticed clock jitter with a clock at 7MHZ. Gets worse as the clock frequency increases.
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Barry
K3BO
Re: NBFM (Was: AM on sBITX?)

 

Or even with the use of a library for demoding nbfm, like csdr.

- Rafael

On 10/30/24 9:08 AM, Evan Hand wrote:
The FFT transforms should make it possible to decode/encode the FM deviation from/to an audio signal.? The encoding process zeroes all the frequency bins and then places a value in the bin that corresponds to the audio level.? Decoding involves finding the peak in the frequency domain and converting it to an audio level.
The above is a thought experiment so that I could be wrong.
73
Evan
AC9TU

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Re: esp32 vs Raspi Pico

 

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The Raspberry pi pico.?

Programmable i/o pins can generate frequencies from 0 to 30 mhz without use SI5351 or AD98xx dds even in quadrature for tayloe mixers....

Rick LU9DA

El 30/10/2024 a las 13:38, Richard Neese via groups.io 别蝉肠谤颈产颈ó:

What is the preferred?board between these 2 for building a vfo ?

Re: sBITX 64Bit Pi Image Available #sBitx

 

I'm curious if this choice will impact the sbitx app.
?
esp32 vs Raspi Pico

 

What is the preferred?board between these 2 for building a vfo ?
Re: NBFM (Was: AM on sBITX?)

 

The FFT transforms should make it possible to decode/encode the FM deviation from/to an audio signal.? The encoding process zeroes all the frequency bins and then places a value in the bin that corresponds to the audio level.? Decoding involves finding the peak in the frequency domain and converting it to an audio level.
?
The above is a thought experiment so that I could be wrong.
?
73
Evan
AC9TU
Re: NBFM (Was: AM on sBITX?)

 

Since FM detection typically requires the I (in phase) and Q (quadrature) samples to measure frequency deviation we can’t really use a typical quadrature detector without Q?

I’m thinking a synthetic quadrature detector may do the trick.
I think we should be able to approximate FM demodulation by generating a synthetic Q using Hilbert transform or a differentiator.
Maybe I’m wrong, and that is something I am often…But this might be an approach I’d take a stab at.
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Re: My new sbitx case

 

Thanks Ashhar! I was designing this case since I placed my order last Thursday.? ?It arrived Monday.? 2 business days to the US. This radio doesn't fit a tuning knob.? There ii no dedicated tuning knob, it's multi function,? so I didn't want it.??
Re: My new sbitx case

 

I am glad you chucked out the tuning knob! Great job!


On Wed, Oct 30, 2024, 4:27 AM William Hemmingsen via <lee.hemmingsen=gmail.com@groups.io> wrote:
Just the ends and the display bezel were 3d printed?
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Re: My new sbitx case

 

Just the ends and the display bezel were 3d printed?
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