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Thank you Gyula, yes but I dont see my problem anywhere.? I power on load the software i see the splash screen clearly but that is all it wont power off so its not able to complete software loading(

Hi all, I am a new user of the assembled QMX. Experience of using approximately 2 weeks at home with a stationary antenna in CW. It is very important for me to fix: 1) Sidetone volume control; 2)

https://qrp-labs.com/qmx/qmxtrouble.html ( https://qrp-labs.com/qmx/qmxtrouble.html ) did you read this description? -- Gyula HA3HZ

Giuseppe, The qmx pin out drawing is very useful to me.? My qmx will only turn on and? get as far as the splash screen and thats it(it wont turn off).? I carefully checked all 10 pins in the

Peter, I just found this link for a 'parts kit; (or assembled) for the "QDX Mosfet PA Mod" https://www.tindie.com/products/jasonkits_qrp/qdx-mosfet-pa-mod-kit/ I have bought from Jason before,

Hi Evan, Chris, Ryuji I can quite easily set up a sweep in QMX based on power output measurement. Everything interacts with everything. I don't think you can make too many assumptions about symmetric

Hi Ross, I played with this a bit more this morning. To answer your question about the sim of the transformer, at the moment I simply use three coupled inductors with K=1. Nothing fancy. Some

Vimeo won't let me watch the video. It says it's unrated, so I have to login to watch it.

Tony and JZ, What transformer model are you using in the LTSpice sim of the PA? WTST of RWTST? That is a picture of your .asc? 73 Ross 6

Hi To be tested! (as soon as I got FDT86256s) In QCX, QDX or QMX (If you have one more to obliterate) Use 9 Volt setup (Ross's new windings) Use FDT86256 Pray, then Apply 12 Volts (top case open, a

It sounds like the UL3S is best suited for weak signal digital modes like WSPR and that the QCX- mini would be better suited for a CW beacon and the QCX has some other amazing attributes like CAT

Hi, I've made the current verses band as attached.? for the 13.8 key down was only for a second to get the current reading. This time used a analogue watt meter to check output and corresponds to my

P.S.? I'm sure I have both 0805 and 0603 1nF (aka 0.001uF, aka 1000pF) caps in my stock.

Hi Chris, If you are not comfortable going down the SMT road, I will fix the board for you free of charge if you send it down to me in NJ (and pay return shipping).? I am good on QRZ. 73, Robert,

Brad, that link did not work to me, it took me to an HDMI cable.? Just go to amazon and put?B07D3D64X7 into Amazon's search bar ti see the encoder. 73!? Mark K9TR

Thanks Barb. Milt w8nue

I have run it, Tony, but it is still too early to say much. Two of these seem to produce a bit more output power than 4 BS170 in a 20m sim, but the drain currents I see are transitioning sharply and

Milt, All covered in this document for old and new winding: https://qrp-labs.com/images/qmx/manuals/transformer1_00b.pdf 73 Barb WB2CBA

JZ & Barb, Looking at the FDT86256 data sheet, it has about the same gate threshold range as the BS170. The IV curves show the drain current pretty much flatlining at 1A for Vgs = 5V which is again

Hi, considering the price, I suppose you are better off if you buy another QRP D.L. You then have a 100 and 25 Ohm D.L. without cutting anything. 73 Bojan S53FZ