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I also build the version of Lex and it works perfect (easy to construct) and… I agree: " it's absolute a must have when you are measuring output power with your tinySA (Ultra)" 73 Hans Pa3AAW

Bryan, Do yourself a favor and build a 40dB (or 50dB RF sampler). Like Wes Hayward, W7ZOI described in his article "Simple RF-Power Measurement," QST June 2001, pp. 38-43 (

Brock Another common DIY mistake is to believe a spectrum analyser while feeding it through a path /attenuator that overloads the analyser and/or isn’t 50 ohms at the input and/or doesn’t give

Hi there, A quite common mistake at using the broad band instrument, as the spectrum analyzer is, also is when the dynamic range of the instrument is not sufficient to measure weak signals whereas the

I have experienced similar issues.? I just completed the QMX and it seems to work great on FT-8 as well as with a straight key.? But the keyer has hung on me several times.? The problem is

I am having similar problems with my build. I checked T507 before building and it was OK, my concern is if the enamel melted in the winding section as I had to apply a bit of heat when soldering the

Thank you. I wound the output transformer the same way (RWTS) and believe I got everything nice and tight. quick update: I measured output power with a shorter jumper cable to my meter, and

Hi All, I Finally solved also the issue about the right encoder. After carefully checking the MPU with a microscope I found that the solder of this part on the main board was defective, especially

Hi Juan - No, they are different. The left QCX encoder is analog and can't pushbutton The QMX are both rotary encoders and can pushbutton down: Sandy KB3EOF

I got tired of worrying about power ratings of attenuators and accidentally putting too much power into a device so I built one of these: https://youtu.be/byF1FLdbUiA?si=Cf1gfyl1EbRiH71m (

Alan, Yes I always try bothe the m328 and m328p versions of whatever trial I'm running - with different feedback but the same error except for the device id it's looking for. I'd like to know how to

That one should work, though I would connect the first one in a series to get 50dB of attenuation (37dBm-50dB = -13dBm).? This is under the maximum that the TinySA Ultra can handle but still not

Local HRO didn't have it so going to order another attenuator online. Looking at this model:

Hello all, I hope you are very well. The QMX volume encoder is same what the of QCX? Thank you!! 73, Juan LU9CYV

No firmware. initial current is 0 mA. push power on and the current goes to 5.73 mA. Bob K2QPN

From a little Googling it appears to me the 10 in the part number means 10dB and the 25 means 25W. You'd need much more attenuation than 10dB to avoid totally overloading the TinySA. 73 Hans

Hello Joerg In any firmware version from 1_00_009 onward, the switching regulation loop runs in the highest priority interrupt process. NOTHING can stop it. It certainly doesn't get delayed by any

The attenuator does have an 'in' marked on one end and an 'out' marked on the other. Photo below:

Just realized that replies here are not in-line and get stacked on the end. Sorry for the concurrent messages. I did run the self-test on Tiny SA Ultra (all passed). Last night I also updated the

Did you run the self-test? I am sorry for my misinterpretation of the Harm message.? I would still do the self-test. Looking at your picture again, two points come to mind: 1 - Are there male and