Forgot to share the link..

?

Hello.

I've made some changes to my build for sBitx with improvements contributed by myself and others. The repository can now be used on both the default, 32bit and 64bit versions of the sBitx transceiver.

Notable changes or improvements:

• telnet fix
• time zone RTC fix
• macro button display fix
• removal of non-working modes
• FT8library compatible with 32 bit and 64 bit
• update script changes

More improvements will be made as they are discovered.



-JJ

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I'm not a programmer, I wrote this so can someone correct the mistakes?


-------------------------------------------------------------------------------------------------------------------------
diff --git a/sbitx.c b/sbitx.c.new
index 36fac58..f05cecf 100644
--- a/sbitx.c
+++ b/sbitx.c.new
@@ -10,6 +10,7 @@
?#include <wiringSerial.h>
?#include <linux/types.h>
?#include <linux/limits.h>
+#include <sys/ioctl.h>
?#include <stdint.h>
?#include <time.h>
?#include <signal.h>
@@ -68,6 +69,8 @@ fftw_complex *fft_m;????????????????? // holds previous samples for overlap and discard convolu
?fftw_plan plan_fwd, plan_tx;
?int bfo_freq = 40035000;
?int freq_hdr = -1;
+int fd;
+int RTS_flag = TIOCM_RTS;
?
?static double volume?? = 100.0;
?static int tx_drive = 40;
@@ -1187,6 +1190,8 @@ void tr_switch_v2(int tx_on){
??????????????????????? mute_count = 20;
??????????????????????? tx_process_restart = 1;
??????????????????????? digitalWrite(TX_LINE, HIGH);
+?????????????????????? fd = open("/dev/ttyUSB_PTT",O_RDWR | O_NOCTTY );
+?????????????????????? ioctl(fd, TIOCMBIS, &RTS_flag);
?????? delay(20);
??????????????????????? set_tx_power_levels();
??????????????????????? in_tx = 1;
@@ -1212,6 +1217,8 @@ void tr_switch_v2(int tx_on){
??????????????????????? delay(10);
??????????????????????? //power down the PA chain to null any gain
??????????????????????? digitalWrite(TX_LINE, LOW);
+?????????????????????? ioctl(fd, TIOCMBIC, &RTS_flag);
+?????????????????????? close(fd);
??????????????????????? delay(5);
??????????????????????? //audio codec is back on
??????????????????????? sound_mixer(audio_card, "Master", rx_vol)
---------------------------------------------------------------------------------------------------------------------------------

For question number one.? If your time is right to the minute but you are stuck in the wrong time zone.


Also have you installed the Toolbox yet?



It will help with the Time Sync.? But, you'll have to do the other thing if you're having time zone issue of being stuck in the Arizona time zone.

For question number 2 have you tried sliding your volume slider up during transmit? Does the power go up to something reasonable?? Do you have to move the volume up every time you transmit?



If that is the case, like it was for sBitx V3 I had to overwrite my?default_hw_settings.ini.

Jeff
AE9J
??

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On Wed, Mar 27, 2024 at 10:43 AM, HA3HZ wrote:

Simply download the .zip from the drexjj/sbitx 64-bit site. The TZ fix is already built in here.

The currently available 64-bit sbitx_gtk.c includes additional cw macro fixes. After unpacking, copy the sbitx_gtk.c file to the sbitx folder, then build it with the ./build sbitx command.?If you haven't done this yet, make a copy of the sbitx folder first. There are many things you can do with File Manager.

--
Gyula HA3HZ

Thank you for assisting, Gyula!

Great Job Petr, thank you. I found your manual very helpful? but no schematics, where did you find the schematics? I followed Fahran's link and there find only the software.

Here it is:

Ioan,
--
Gyula HA3HZ

Hello N4GW,

There is no way to return to a previous setting with the stock software.? The other characteristic is that it always starts with a "safe" value for the calibration, NOT the last saved value.? With the stock software, you must write down the value before saving it to the radio.? The way that I recalibrate the frequency is to follow this video:


The BFO Tuning Aid no longer works.? You will need a PC or other audio spectrum analyzer for BFO tuning.? Here are two for PC:



In the US, WWV can be used; however, the 500/600 hertz tones confuse the zero-beat process.? I use a signal generator that I trust to be accurate.

Note that there are three steps or phases in the video:
1 - adjust the BFO so you can hear the low-frequency tones
2 - calibrate the master clock
3 - Readjust the BFO for best speech reception and opposite sideband rejection.

I hope this helps.
73
Evan
AC9TU

When measuring the inductance of your coil with the nanoVNA,
do so across a range of frequencies near 45mhz, the frequency of use.
I'd suggest measuring inductance across 35 to 55 mhz.

Gerard,

It would be wise to check the inductance of your torroid using your nanoVNA.
Could well be that there is enough capacitance between windings to give poor results.
Surface mount inductors might work better.

If you don't have a datasheet for the 45mhz module, you will have to just try different caps and inductors
to see what's best, measuring the response with your nanoVNA.??
Figuring out how to do the calculations is a hobby in itself, but for a properly working filter
it all comes down to proper testing.

Jerry, KE7ER

Pleased with the radio.? Easy to assemble and sounds really great.??



Question:? I noticed I was about 60 hz off.? Went into the menu and Freq calibration and now I am over 3 Khz off.? Is there a master reset to get me back to original settings.? If I can start over I think I can fix it