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I have yet measured the output voltage (after the 40 dB attenuator). Below are the results. Indeed, one can see a 2 MHz amplitude modulation. That's not an aliasing artifact. Below there is a

The calibration screen does come up - for less than 2 seconds. Not enough time to calibrate. What next? Thanks, AC4OW, Sam Hanie samhanie@... [email protected]> wrote:

I don't know where R70 is on the PCB, or how accessible it might be. Can Ashhar have someone back at the factory swap out R70 with a clock buffer and see if that reduces spurs? - Ron

Frank, my measurement setup has been described already in my FIRST posting on this topic: " Measurement with a TinySA Ultra connected via 50dB (20dB + 30dB) attenuators. Adding another 30dB of

The U.S. regulation is -43 dBc. ?The spur 2.5 MHz above the carrier does not get close enough to meeting that spec for me to be interested in taking more careful measurements. ?I can also hear that

Work, The spurs are well below -40 dbc [email protected]> wrote:

Same issue as Sam. Pressing the screen while powering up and releasing shows the calibration screen with red markers in every corner. One corner has a white marker, touching it shifts the marker to

My zBitx arrived today. I can confirm that when working from batteries, it produces those modulation (?) components. 73, Wojtek SP5DAA ?r., 16 kwi 2025, 17:36 u?ytkownik Joerg DB2OO via

Jeorg, Please describe your set-up and monitoring cabling, antenna etc,l Sincerely, Frank Krozel t: 1-630-924-1600 frank@... BSEE, AASEET, FCC Lic.# PG-18-19178,

I crossed checked with two different models of tinySA, and also compared against two other QRP transmitters using the same 50 dB attenuation chain at similar power levels. ?Only my zbitx showed the

To be on the safe side, I tested it with a lab supply as well as with 18650 batteries: Same result, the +/- 2.x MHz spurs are there with both types of power supplies! I think the spurs are

Power up the unit while pressing the screen with the stylus. it will bring up a calibration menu.

If the problem is related to the change of power supply voltage due to periodically changing current consumption, the problem may persist with battery supply. They have non-zero internal

Ashhar, Thanks for the information. My business is Electromagnetic Compatibility for the past 40 years or so. I have been following along on all the posts. So many folks take their (fill in the

zBitx touchscreen no longer aligned. When I press the macro key "F4", the terminal reports that I pressed "F1". rev 1.06 / 3.052. Any help appreciated. Thanks, AC4OW, Sam Hanie

You could probe the input to the 3.3v regulator. However, this is a little more complicated than what it appears to be. First, I spent weeks measuring the spurs. They are all below -43dbc except on

GM Gordon,? I still believe it could be a power issue - the 3.3v regulator does not appear to be properly filtered per the manufacturer Datasheet. The other possibility is that the output of the

Well that tells us even more.. Not due to the power supply. Unlikely to be produced BEFORE the crystal filter (it would screen it out) Has to be coming in AFTER the filter Dependent on the existence

I tested my unit with two different sets of batteries, and saw the +-2 MHz spurs. So it's not external SMPS noise. The spurs were there when trying to FT8, CW, and 2Tone modes, They only vanished

Quickly is all I can say, My Order (#3595) was place UK 1st April 2025 @ 06:24 GMT Shipment collected Hyderabad -12:00 UTC 14th April 2025 Shipment expected by 23:59 on 17th April 2025 Actual Arrival