开云体育

I am getting this band noise. It has not always been present. Could this be caused by the INA260 voltage/current sensor module I recently added? I’m asking to see if I need to remove it from my radio. I am hoping this has been discovered and fixed by someone else already. Has anyone else seen this yet? Thanks for your help in advance, David WK4DS

Just got my zBitx today. Powered up, and the nice screen pops right up. It says "Waiting for the zBitx to start..." and no other response. Been waiting a long time, but no joy. Tried power down and restart - same result. Any advice would be appreciated. 73 Dave, VE3WI

A buddy reported to me that my zBitx was showing 1.8s of DT in his WSJT-X console, and I can verify same with my own copy locally. I have verified that the clock on the zBitx is to the instant correct with WWV, ie. when I hear start of the tone at the top of the minute, the minute switches over on my zBitx, as well as with my NTP synchronized devices around the shack. Yet, when I answer a call or start a CQ, I'm showing as 1.8 seconds out of sync with most other people. Also what 'app' or library or whatever is being used for FT8? 73, .Vince

Hi, There have been few reports on this list of customers' zBITX units arriving with issues. Mine arrived in fine condition here in Australia via DHL courier. Standard packaging seems ok, with little chance for damage if treated properly. If we were to assume nothing being equal, we might be able to trace the issue starting from final "Test Report" before shipping to testing after unboxing. When I received my unit, I placed a couple of batteries in the holder, attached a dummy load, and tested it briefly using another transceiver. All seemed OK. I do not know how useful it would be, but I am attaching a photo of my test report below in case that helps. I am wondering if those that have issues with their units want to do the same in case it might help discern a pattern. I am basically a software guy, and am looking forward to buying another unit to test them together with each other, Best regards, -Rob, VK4SSE

Hi Ashhar, From another post: "I am preparing a new messagijg system that works over ft8 protocol that is different from js8call. It is more like a messenger. It needs the radio to be on, 24x7 (and why not!). That will happen ay the FDIM." Any updates? 73 Wei AG6AQ

To find the root cause of the spurs, I worked in 2 steps: 1. I took the front panel board out of the case and connected it with jumper wires to the main board. My objective was to eliminate possible EMI from the Pi Pico into the RF board. This did not make a difference for the spurs, as they just went down by 0.5dB which is the resolution of the TinySA. 2. In the si5351v2.c code I changed 8MA to 2MA. This results in approximately 5dBm less output power (33.5 vs 38.1dBm) but also a relative reduction of the spurs by approximately 7.5dB from -28.1dBc to -35.6dBc: Reduced output power is most probably due to the fact that the zBitx uses a diode ring mixer instead of the KISS-Mixer used in the sBitx and the oscillator power to the ring mixer is provided directly by the SI5351 CLK2 output (in reality an MS5351). Also, the IF diode ring mixer gets its oscillator signal directly from the SI5351 CLK1, whereas in the sBitx there is a buffer amplifier with two 2N3904. It could be that the much higher load on the SI5351 outputs, results in some intermodulation in the SI5351, which finally shows up as spurs. Given that these spurs are a showstopper, to transmit with the zBitx as the spurs are not at least 40dB suppressed, I am looking forward to further investigation and direction by hfsignals. On Mon, Apr 14, 2025 at 11:39 PM, Ron, N6YWU wrote: -- 73, Joerg - DB2OO