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So I recently received my Zbitx and I think I have a problem. The receive is terrible. I can’t make out anything on it even trying the WWV freqs I can’t hear anything but a sort of “chuh chuh chuh” sound that’s continuous. I’ve adjusted the IF and volume as well as bandwidth but it makes no difference. If there something I’m missing or did I receive a faulty unit? Any and all help is appreciated. Video attached to show sound being heard.

Please disregard. Although no "wizz" at troubleshooting, it occurred to me that I'd been using a bench supply that is only 2A at 12V! Connected up a 4A one I had on a shelf behind me and RF out! Not the first time I've had a "duh" moment, nor will it be the last. 73 All, John N2LCX

zBitx frequency deviation! Can the frequency deviation be corrected?

After many QSO's on FT8, I do not see and reporting on pskreporter. I'm I missing some setting?

I tried to build the software for the Raspberry Pi Pico. There are a couple of things missing: The TFT_eSPI library needs a User_Setup.h file that describes the interface and the type of display that's used and the folder with the code has a file called Read_Me.ino that references a file called platform_local.txt which does not exist in the sketch folder. Are there official build instructions for the front panel software? If not, anybody willing to share their unofficial build instructions? Thanks, Karl Heinz - K5KHK

I have tried different power supplies, all capable of more than 3 amp. Same results. Tried reducing Drive down to 65, that appears to work, but at 70 it resets the Pi consistently. It does it very quickly, so not temperature related. Any suggestions? Software updated as of April 29th 2025

Hello, when I follow the link via wiki and git, proton says no file avaliable. Did I follow wrong link or is the img not more to download? Please advice. 73, Michael

Hi Is it possible to use the zbitx as if it was a Hermes Lite 2 (HL2)? I've searched and maybe It can, and maybe my search terms not correct as I'm a new HAM. Thanks

Hi, I have uploaded a file to a new folder called "Zbitx tests" in the Zbitx files section. This file is of some tests of TX Intermodulation. Kevin

Dear all, I have a Sennheiser USB Audio Headset Epos C20 and would like to use it with the zBitx. It has a USB Bluetooth Dongle but not sure if it works out of the box with zBitx. I came across this software: https://github.com/drexjj/sBITX-toolbox Has anybody installed and tested this add on software on the zBitx? It offers USB Audio Support (and more) … thats why I am curious ? 73 Peter

Got my zBitx two weeks ago and the CW performance is very poor / unusable. On a paddle it misses or inserts characters and macros stop partway through 75% of the time. I have updated the firmwares and still no improvement any suggestions to improve this.

Hi, Just some ramblings... The test sheet with the Zbitx states -105 dBm is the minimum signal. I am not sure how this is measured. I found it difficult with the chuff/chuff of screen update, so by ear I listened to a very weak carrier (from a signal generator) of -105 dBm which appeared on the noise level (with display set in menu mode to minimise chuffing) I extended the display board away from the RF board with Arduino Male-female test leads so I could do some testing I looked at the datasheet of the WM8731 and it said the S/N ratio was -90dB for a FSD level of 1V RMS. The is about a 32uV noise floor. After doing some tests with the display extended away from the RF board, I was able to determine that the gain of the low IF amplifier was in the vicinity of 72x and that the RF Gain/Loss from RF input to that section of the board was about -8 dB as best as I could determine. The low frequency section appears to have a 50ohmish input Z, so 32uV/72 is about 0.45uV at 50 ohms or -114 dBm. With 8 dB loss added to that, the noise floor would be about -106 dBm. I figured that I could try some extra gain to bring the input level up. This was done by adding a 27 ohm and a 4.7uF tantalum from Q8 emitter to ground. This increased the gain, but had a marginal increase in sensitivity. (possibly due to earlier gains/losses) I looked at Q4, the 40MHz RX amplifier, and it was running at about 2.3 mA emitter current, vs the TX side Q3 amplifier which calculates to around 19mA. I decided to change the R27 base resistor from 470 ohm to 1k ohm which increased current to around 8.5 mA. I found I could now hear carrier around -114 dBm now, which is probably due to both the 40 MHz and Low IF gain being increased. It affects the S meter readings. I haven't done any measurements of impedances of the 40 MHz amplifier, and would have to try a breadboard setup to determine that. I think the 2.3mA emitter current on Q4 is probably marginal for a RX IF preamp. The increased gain will also affect the maximum signal that the receiver can handle. Tests were done on the RX front end with a signal generator at high-ish level, and a -20 dB RF probe, into a TinySA Ultra. The tests at the low IF were viewed with a oscilloscope in x1 mode. Clipping appeared on Q8 output at about 3v p-p, probably due to the 3.3V zener clamp. Thoughts anyone... Kevin

I got my zBitx in great shape delivered a few days ago. I am wondering what is causing a beeping noise on my transmitted signal on SSB. I tried both internal and external mics and problem is the same. SWR is great and Battery voltage is 7.6V. I tried using 18650 batteries as well as an external power supply running about same voltage. Any ideas?? 73 de K0NEB

Hi to the group, I am new to the Sbitx and was following thee directions to check for updates and i got an 'fatal error' No such file or directory, #include oled.h When I rebooted the radio it now has no delay in CW relay click and clatter and no delay. Again it appears to be breakin mode. Not sure what to do to fix it. I may need to reload the software, if that is the case -- what are the commands to do that? Thanks in advance -- Rick W7RNB