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Re: Fixing the discrepancy between power levels of USB/CW and LSB//CWR

 

On Sat, Mar 2, 2024 at 06:41 PM, JerryP wrote:
Thank you Gordon for the Wiki article. You really do like fixing things. I happened to look at your "Homebrew sBitx/ICOM 7300 Desktop Mic" article
and the images seem to be missing. Of course, it could just be my Firefox web browser.
--
Jerry Ponko, AC9NM

you’re right, jerry. ? Not sure why, but the images are available in the linked article at the top of that page. ??

thanks for the tip!
gordon kx4z?
Re: sBITX 64Bit Pi Image Available #sBitx

 

Ahh.. it was related to booting with USB headphones jacked in.. that's a tricky gotcha.
Sorry for the seemingly incessant posting.? it's the weekend and I was looking for a project.. lol
Re: sBITX 64Bit Pi Image Available #sBitx

 

JJ on my first SD card burn my sbitx didn't start, I figured it was a bad copy so I made another and this one worked well.?
I rebooted and now when the sbitx is launched it immediately closes.?
fired it from the shell and I observed the error:
sbitx v3.02
sbitx: simple.c:652: snd_mixer_selem_has_capture_switch: Assertion `elem' failed.
Aborted

Any idea what that is? I wonder if its somehow related to the strange volume control scaling I noted earlier.
Re: sBITX 64Bit Pi Image Available #sBitx

 

I found that if I moved my taskbar?to the bottom its even better.
YMMV

On Sat, Mar 2, 2024 at 10:59?PM Peter VK3PYE <vk3pye@...> wrote:
I have it installed on a 128GB USB drive, and it's booting as the primary device (this leaves the original micro sd card in the Pi4).
Its working nicely so far. I've been able to test-drive JS8Call by sending to/from my shack 7300 & PC.? Sweet!
I found that by reducing the desktop taskbar down to 30 pixels, the sBitx program can be maximized (no crash on clicking KBD) and the only things then hidden by the taskbar is your call, grid and utc time, so very usable like that.??

Thanks JJ, nice job with Bookworm 64bit.
--
Pete VK3PYE

Re: sBITX 64Bit Pi Image Available #sBitx

 

Thanks for the build JJ. it runs well on a Sandisk SD and even better over USB3?
The original? SD that came with the rig is taped to the inside of the case for safekeeping,?
I had first tried the release on a Samsung SD and saw a performance hit.?

Also.. Hmm, is it just me or does the AF scaling seem off??
<First Bug>
50% is just about where the volume drops off to zero in the cans and over the speaker.?
Am I the only one seeing this and where is this calibration made?

W2JON
Jon

On Sat, Mar 2, 2024 at 7:47?PM JJ - W9JES <w9jes@...> wrote:
Hello.

I created a pre-compiled version of sBitx on 64 Bit for the Raspberry Pi4 for those who are interested.

?

?
Please go ahead and test it, sharing your thoughts afterward. Consider this a beta version, pending improvements based on the feedback I receive.. I've included sBITX Toolbox as well as other ham radio apps. It has been tested on both a 2GB Pi and 4GB Pi without issues. The download is designed to fit a 32GB SD Card or USB storage device.







-JJ

Re: sBITX 64Bit Pi Image Available #sBitx

 

I have it installed on a 128GB USB drive, and it's booting as the primary device (this leaves the original micro sd card in the Pi4).
Its working nicely so far. I've been able to test-drive JS8Call by sending to/from my shack 7300 & PC.? Sweet!
I found that by reducing the desktop taskbar down to 30 pixels, the sBitx program can be maximized (no crash on clicking KBD) and the only things then hidden by the taskbar is your call, grid and utc time, so very usable like that.??

Thanks JJ, nice job with Bookworm 64bit.
--
Pete VK3PYE
Re: #sBitx on Raspberry Pi OS 64-bit #sBitx

 

I changed the script to install config.txt in the firmware directory. Your wide display is unusual. Your setup looks very industrial using those
t-slot extrusions. I don't really know much about the web interface. I went for the wooden case look. ?
--
Jerry Ponko, AC9NM

small.jpg

Re: Fixing the discrepancy between power levels of USB/CW and LSB//CWR

 

Thank you Gordon for the Wiki article. You really do like fixing things. I happened to look at your "Homebrew sBitx/ICOM 7300 Desktop Mic" article
and the images seem to be missing. Of course, it could just be my Firefox web browser.
--
Jerry Ponko, AC9NM
Re: sBITX 64Bit Pi Image Available #sBitx

 

Thanks JJ.? I see that you have pre-installed my favorite digital QSO mode program -- JS8Call -- thankyou.? I use the android app "js8remote" to communicate with the installed JS8Call program. That app gives you a "remote keyboard" for JS8Call.
--
Pete VK3PYE
Re: #sBitx on Raspberry Pi OS 64-bit #sBitx

 

After installing a fresh default image on my second Pi, I noticed it had a config file already there too, but with a note at the top saying not to edit it and that the config is in the firmware folder.

Anyway, I was able to get both pi's running and connected through Ethernet with the web interface using your installation on the main pi and the default image on the second pi using the web interface.

I hope I'll be able to work out enough about the web UI that I can make just the spectrogram appear on the second screen, but I have no idea if it's feasible to even have two web uis running at once.
Fixing the discrepancy between power levels of USB/CW and LSB//CWR

 

I don't think this has been incorporated into the "code" yet, so I created a wiki page explaining the fix??/g/BITX20/wiki/36181
(which gives a snippet of code so enterprising followers can edit their files and recompile with ./build sbitx? ? ? ?)?
and edited the wiki front page to point as well to fix, under "sBitx Code" .? ?Github is beyond me, so this is about the best that I can do.

On MY sbitx it was clearly obvious that upper side band transmissions were lower in power level than lower side band transmissions.? ?The same applied to CW and CWR because they are simply single-tone USB and LSB signals.? ?THis is simply a a fact of life with the IF crystal filter, which is not perfect and has unavoidable passband ripple.? Your filter may have a different response, so investigate with a bit of trials on USB and LSB before blindly copying what I did.

In my case, the rough difference was 3dB (power factor of 2) between USB and LSB.? ?So I simply added a few lines that multiplied the SIGNAL (hence, a voltage) for the frequency bins of the USB signal by 1.4 (square root? of 2).? ?This occurs before the windowing filter, so it doesn't cause any problems.

It has worked well for me, since I do a lot of work with upper sideband modes and wanted the power level to be about the same on upper as lower for the same "drive" setting.? ?Nothing is perfect, but getting close is better.

73
Gordon KX4Z
Updated Wiki Page: Home #wiki-notice

Group Notification
 

The wiki page Home has been updated by Gordon Gibby NND4FL (NCS521) <docvacuumtubes@...>.

Compare Revisions
sBITX 64Bit Pi Image Available #sBitx

 

Hello.

I created a pre-compiled version of sBitx on 64 Bit for the Raspberry Pi4 for those who are interested.

?

?
Please go ahead and test it, sharing your thoughts afterward. Consider this a beta version, pending improvements based on the feedback I receive.. I've included sBITX Toolbox as well as other ham radio apps. It has been tested on both a 2GB Pi and 4GB Pi without issues. The download is designed to fit a 32GB SD Card or USB storage device.







-JJ

Re: SBITX rev 2 kit Info S/N 0096

 

Evan,
Thanks...I've been looking all over for this..I will attempt the mod..
I've also come across the message you found below..
I appreciate it..
i think i only had this working for about 1 hour max before it toasted..it has been in the box for years..

Vince
Re: Homebrew SBITX LPF board

 

On Sat, Mar 2, 2024 at 08:05 AM, Scotty R wrote:
No more local radio shack stores, but internet parts stores worldwide
All true... But I think there is no better time to do homebrew radio electronics than ever. Sites like Mouser and Digikey have a vast array of components of all types. Common components are available on Amazon ship to your door the next day. The internet is full of useful to tutorials, videos, projects, etc.? heck, you can even email the designer and the high likelihood is they will answer. Thank you, Farhan.??

I've had so much fun and learned so much over the last few years building rigs and leading our clubs maker's group. I highly encourage anyone with an interest to try building some things on their own.??

73,
Dean
KK4DAS?
Re: A solution to the noisy hot 5V buck regulator

 

Hi David,

I only recently found out about these regulators. I would have liked to try one on my uBitx V6 but had already found a third party vendor that sold the Raduino board with a completely redesigned 5V regulator section with a heat sink, that cured that problem. On my other home brew rigs I just used linear regulators with heat sinks and had no problems because everything was low current. Yes, I think the 5V regulator problem should have been addressed, (by the factory), before now but that would have raised the overall cost of the radio which is built to price point. The Mini 360 regulator used by the manufacturer literally cost less than a $1 a piece for you and me but bought in large quantities probably cost .40 ea or less. The Drak regulators I used cost $13 each from Amazon. This is what makes the sBitx and other HFSignals radios great, they don't cost a lot and it's easy to improve things on your dime if you choose to so. If I had my way I would have stayed with a Linear regulators to eliminate RFI but there just wasn't viable option to handle the current demand so we had to start using Buck converters which are inherently noisy but more efficient. Everything is a trade off, but I'm pretty happy with my sBitx now.

Joel
N6ALT
uBITX V6 AGC

 

Does anyone know of somebody that still sells AGC kits for the uBITX V6??
--
'72
Aaron?
Re: Homebrew SBITX LPF board

 

Well, I am impressed.? My homebrew experience from scratch is quite limited. Sourcing parts is so much different now than when I began ham radio. No more local radio shack stores, but internet parts stores worldwide. Enjoy!

Scotty

Scotty
Re: Homebrew SBITX LPF board

 

Thanks Farhan, I have that as well and after I chat last week it is now in line on both TX and RX.
Re: Homebrew SBITX LPF board

 

You also need a 30mhz cut off LPF at the mixer output


On Sat, Mar 2, 2024, 8:01 AM Dean Souleles <dsouleles@...> wrote:
Well waiting for my 12MHz crystal to come in from Mouser I decided to build the switched low pass filter board. I spent some time looking at the schematic and reading all the notes about how the diode switching works and I decided it was just too complicated for him my needs. So I went with a simple relay switched board.

Manhattan style as always...

Waiting for a couple of caps to finish one of the filters but other than that the board is finished.

This is the last major board for the full transceiver. I'm going to try and make Dx contacts on all bands that are active this weekend during the contest.

73,
Dean
KK4DAS
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