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I'll go shop for another attenuator and retest. This one came with the Tiny SA from Amazon and I can't find much about it online. Will visit HRO later.

The green 'HARM' text on the left of the display in the screenshot actually appears on my Tiny SA when the unit is placed in harmonics testing mode: Menu>Measure>Harmonics. You then input the

I haven't been able to find much about it. The attenuator came with the Tiny SA Ultra from Amazon as an optional accessory. It just indicates that it's 25W. I can run to HRO nearby later and grab

Thanks Evan. It is a Rev 2 PCB (QMX 20 to 10m) and I have added the 1N4148 as suggested by Hans. -- 73, Rick VE7TK Website: https://www.ve7tk.ca/ ( https://www.ve7tk.ca )

? thanks JZ! This weekend I will see if I can get the QMX to work on FT8 TX.

Hi Rick, As long as you do not change the LPF selection.? You do not state if this is a Rev1 or 2 board.? If it is a Rev2, I suggest adding the protection diode on Q508.? This is listed on the QMX

I have been doing some tweaking of my 20 - 10m (12VDC) QMX. Today I was "playing" with the the BPF settings for L401. I was concerned in particular with the image rejection (-28.3) and band centre

My QMX just passed away - requiescat in pacem ! You might remember, that I built it in August ( /g/QRPLabs/message/107523 ). I did only a handful of FT8 QSOs with it, to validate,

Hi all, next Monday, January 15, is the next QCX WARC Party. See https://www.qrp-labs.com/qcxmini/qcxwarc.html for all info, and remember we have new rules to encourage the use of QDX and QMX

Direct heat conduction to a metal case is the best solution and copper strapping is the way to go. Aluminum isn’t as good of a heat conductor but it’ll do in a pinch. I once did an experiment

You should be able to get more than that at 12v supply. I rewound the output transformer on mine using the RWTS method described in the online docs and the output power reached 6 watts into a dummy

A very common measurement problem is overdriving a spectrum analyzer. The general rule of thumb is to not apply more than 0 dBm into the spectrum analyzer lest one see far more harmonic content than

Many amplifies use relays to enable transmit. Measuring source or sink current is more realistic.

I think there may be some other sneak things going on damaging the IC402.? It will be interesting to see if the diode mod. provides full protection, including other possible sneak actions. Hans did

Once in firmware update mode just copy the new firmware file onto the "drive". It does not matter if the version of the new file is older or newer than what is there, it will replace it. DO NOT DELETE

Hello Bryan, Welcome to the building community! From the pictures you posted, the TinySA Ultra is overloaded.? Note the HARM message on the left of the display.? That is telling you the input is

I have a QDX Rev 3,? when I construct it I use firmware v1_05 and everything is OK. Yestoday I upgrade firmware to v1_10 and do some audio filter sweep and RF filter sweep(with dummy load), the

That is an excellent result, Bojan. Bryan, Is it possible that your " attenuator " is not that at all, wherein the output BNC is in fact a peak voltage rectifier port for measuring power? JZ

Hi, I was curious and measured my QMX?again at +13.8V PS and 14.074 MHz (with 4 x TN0110 in PA). With the RF output power of 5W the 3rd harmonic is ~58 dB down. -- 73 Bojan S53DZ

Rob, I usually use a USBASP and mainly Averdudess in Windows. My notes say " QRP Labs kits are supplied with either ATmega328 or ATmega328P. The signature is different. Normally if you see the error