开云体育

Great! Hope to hear it on the air!
73 Brad

Thanks.

Repairing the trace got things working.
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73,
Mark, N8ME

my sBITX? factory built is for sale ..?? complete with new t/r board installed. Works as expected.

SHIPPED TO? US.???? complete with mic,? Ser# CHO146????? 450$ freight included ....

qrp is not my thing ,,,, at least not this year...????? time to empty the shelf....


bill NY9H ny9h@...

Mark, just my experience ...
the resistor / torroid combinations were not soldered well to the board by me and Ive soldered lots of torroids in my past..mainly because of the enamel was still partly on the torroid wire.?
Once I fixed that I was good to go.
73 Brad N8YG

Spencer, I use 5 inch Basic screen with the Inkit box. I had noise from the power line to the Nextion (and yes, you need a separate power regulator for the larger Nextion screen) but this was 99% corrected by making a toroidal choke as described elsewhere on this site, 70-80 turns #22 enamel on a FT-114-43 toroid. (The noise was NOT an issue whatsoever with a 5” Nextion Intelligent version, but I could not find a dedicated file that gave full functionality so I went back to the Basic screen.)
I have had serious problems with the rig on CW on 24 and especially 28 MHz (lock into transmit on a short key down, and side tone disappears, requiring band change or power cycle to unlock). Is that the sort of free issue you are talking about, and how did you resolve the issue?
Jack, N6LN

Hi Andrea,

There is not a setting in the KD8CEC software that can adjust the Si5351 drive setting for each band.? This is done for each of the 3 oscillators one time at initialization.? The Si5351 drive does not impact the power out.? The power level is RV1 on the main board which is set for all bands.? That is most likely the issue: the leads may have been broken, or the setting moved.? I suggest you pick the band with the highest output and adjust it for 10 watts.

73
Evan
AC9TU

?

Wow! that looks a bit daunting for me, I think I will wait for the stable version. I hope this all automated in the future. Thanks Farhan.

Joel
N6ALT

Mine does the same thing, if I wait a few minutes it updates to the right time automatically but I think it's doing through the time server and not the RTC.

Joel
N6ALT

Mark,

Another point: I would verify that the sBITX works at 12 volts, then increase it to 13.8 volts.? It is also best to use a current limited power supply for the bias adjustment.? My rig had RF feedback issues and would lock up in a state between TX and RX, drawing as much as 10 amps.? There has been only one other report of this issue, but it does not hurt to use a 3 to 5-amp current limit to start.

73
Evan
AC9TU

Mark,

Yes, you need to repair the cut trace from the software-based T/R fix that did not work.? You also need to remove the jumper.

The cut trace is why the bias adjustment is not working.? That line supplies the power to the bias circuits and the pre and driver stages of the amp.

73
Evan
AC9TU

Does anything need to be done to enable the battery backup RTC. ?I disconnected the network cable from the Raspberry pi and shut down and rebooted and the time was not correct. ?It was correct before the shut down.
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73,
Mark, N8ME

Last night I did the T/R switch upgrade to my sBITX. I am trying to adjust the PA Bias per the instructions. The radio is connected to a 13.8V variable power supply and a 50 ohm dummy load. The radio is set to 14.074 MHz USB. Mic is set to 0, the DRIVE_BIAS and PA_BIAS pots are fully counterclockwise. On receive, the power supply shows a current of about 700 mA. I press the PTT on the mic. The radio indicates TX mode, the current goes up maybe 40 mA, but then doesn't change with adjustment of the PA_BIAS pot. As far as I know, the finals were working fine prior to the upgrade. I did download and build the latest version (2.0) of the software from Github.

Previously, I did the mod that involved cutting a trace and running a jumper to a GPIO pin for TX. During the recent upgrade, I removed the GPIO pin jumper, but didn't repair the cut trace. Do I need to repair that trace or reinstall the GPIO jumper. ?I had also installed some diodes, do those need to be removed?


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73,
Mark, N8ME

Kelly?

are you testing it on SSB? If so you should not see power needle deflection when you are not whistle or talk into mic… (sorry if you know it) so better is to select CW and using ptt on mic. You should hear relay click, see TX icon on LCD and power deflection on power meter…
Can you check it?

Petr

Kelly,
You most likely don't have the same problem as VU2JCD.
Best to go back to your own problem thread as not to confuse the two.
It will also help people trying to help both you and VU2JCD.
Regards,
Gary

I have test equipment and I have a 100% stock 6 unit with the OEM Arduino and the 6.1 code it all came with. when I press PTT on the mic I get relay click and no RF output on a SWR meter, if I click PTT rapidly I will see the SWR meter spike but not much else. I could be inducing my own spark gap!

anyway would love to know what to check on my unit as it sounds like they are tested before shipping (I am back to LCD and stock nano with 6.1 on lower left)

kelly

Spencer,

If you have a 3.2 or greater sized Nextion, you will definitely need another 5v power supply. Otherwise, the 5v regulator will go into shutdown mode when it hits its max temp. The 2.8 screen works fine with the standard regulator.

73
Mark

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AJ6CU
KD8CEC 2.0, Nextion Screens,? and open source uBITX Raduino boards for Arduino IOT, BLE, RP2040, Teensy 4.0, and Raspberry Pi Pico
https://github.com/aj6cu

VU2JCD,

Be sure to test the relays while transmitting.? Best done with a dummy load connected.? You must select the new band and then press the PTT to verify that the relays are switching.

73
Evan
AC9TU