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I'm going to follow this, now that my uBITX v6 is working FB, thanks to you all here in the group. For sure mine could use some AGC, that would be really nice. 73, Richard AG5M

Thanks for the information, Joerg It could be intermodulation occurring in the SI5351a 40 MHz output transfering into the other? SI5351a output. Or something occurring in the 40 MHz/RF mixer. I am

Wojtek, The short answer is yes.? It will change the relationship between the primary signal component and the spurs.? As Godon stated, " It looks like there can be some compression above -1dBm.?

These are my results for a single paddle. This is using 3.051, I just upgraded to 3.052 but these were already on my

Dave, A man with two watches dies not understand measurement theory. The one watch guy has error too..the two watch guy measures it partly… Vince and I have discussed this.. Frank K4FMH

Looks like there can be some compression above -1dBm. The overall linearity is spec'd at +/- 2dB if you avoid this "gotcha" https://www.tinysa.org/wiki/pmwiki.php?n=Main.Specification Back down the

Well RATS!!? ?I knew the itty bitty geared DC motors I was using were pretty small. *Apparently I stripped a portion of a gear this afternoon.* It works find down to about 25 degrees and won't go

Thank you Evan. Can it lower the carrier peak and cause false increase of the spurs (vs the carrier)? I'd be glad to find my measurements incorrect. 73, Wojtek SP5DAA

Jody, others aren't reporting quite the same thing. You are pointing to a delay in the T/R circuitry, and indeed there was one in the sBitx, as well as a sampling issue throughout. However, it

*RE;? Why do some people have a problem with the zBITX CW Mode and others do not?* I tested with a Straight Key.? ?I can offer the following observations and opinions: - Send Fast (20-25 WPM) and

I am not getting good results with the AGC supplied by AmateruRarioKits.? I am unsure if it is a bad board (it does not have the multi-turn potentiometers shown in the documentation) or if it is the

Wojtek, From the TinySA Ultra wiki: * For best measurements keep input power below -25dBm I always ensure that the peak displayed is below -25dBm.? With either my Basic or Ultra, I get different

So one hypothesis is that HFSignals got a bad batch of ms5351's, where some of them perform below spec in terms of clock crosstalk. ?But some (Ashhar's) are Ok. If this turns out to be the situation,

A man with a watch knows what time it is, a man with two watches is never sure... @VE6LK @HRWB -- Regards, Dave, N1AI

I have tested my zBitx in CW mode with DRIVE=100 with 50 Ohm 40 dB attenuator and tinySA, on all bands. Sorry, I took the pictures with a mobile, so the quality is poor. Below are the results. 10

Oddly enough, I don't show this using the zBitx on 40m with the tinySA Ultra, same span. This is the first good thing I'm able to report about this radio.

Sam, Wolfgang, I would lift off the front panel (un-snugging the four screws might be enough) to see if it relieves pressure on the screen itself and try again. When I tried with mine it sat forever

So what is different about Ashhar’s unit, since he’s not seeing it? Different manufacturer of the chip? Different bypassing? Different loading?

If intermodulation is between the 40 MHz clock and transmit clock, a quick test might be to turn off Si5351 clk1 during transmit (re-insert 40 MHz farther down the signal chain from an external clock

I did some additional measurements and I am now pretty sure, that the *root cause for the spurs is intermodulation between the 40MHz IF signal @ CLK1 and harmonics of the transmit oscillator signal