开云体育

Hi all I updated the SSB beta testing webpage of the brave, here: https://qrp-labs.com/qmxp/ssbbeta.html and released firmware version 1_01_004 to it. I did not solve problems with SSB phase distortion calibration, but I added a couple of additional failsafes. I am inclined to stop calling it beta. But I welcome your opinions on this. I know there is more to do, there will always be more to do... I think I would be more comfortable calling it the official version and moving onward. Having it all properly documented in the operating manual and all in one place would simplify things and reduce confusion. What do you think? These are the changes: Bug fix: Incorrect PA voltage display on the Diagnostics screen due to 57 / 10 being rounded to 5, as discussed in this forum. Change TX color in the diagnostics screen from red to blue, to avoid confusion since red things are errors. Added two more USB Virtual COM serial ports. QMX now presents itself as a USB hub with a 24-bit stereo 48ksps USB sound card and three USB Virtual COM serial ports attached. The advantage of this is that you can be running WSJT-X connected to a serial port, then run a terminal emulator connected to a different serial port; then you can make adjustments to the gain for example, to get the WSJT-X SNR meter at your desired level. You can also use other tools like "Input analysis" in the "PC and CAT" menu, which displays incoming audio tones from the PC; previously this could not be used unless you used VOX for Tx/Rx control. The CAT monitor can also be useful to be able to monitor incoming CAT commands and responses in realtime on one port, with CAT running on another. And going forward, for developers who wish to experiment with BASIC scripting, it will also be important to have multiple serial COM ports. Added CAT LC; command to retrieve LCD contents: it returns a 32-character string, whose contents are whatever is on the LCD at that instant. Any custom characters are replaced by spaces. The only exception to this is the VFO indicator which is replaced by an 'A' or 'B' character. Added CAT commands SA; which returns the AGC dB value (dB of attenuation applied by the AGC system). Added CAT command SM; which returns the S-meter value. This value is in dB. To convert to S-units, divide by 6. Added CAT command PC; which returns the power level during TX. The value is in tenths of a Watt. For example response PC45; would mean 4.5W. Added CAT command SW; which returns the SWR meter reading during TX. The value is in units of hundredths. For example response SW142; would mean the SWR measured is 1.42. Added CAT command SS to get/set SSB input source. Valid values are 0 (USB from PC), 1 (Two-tone test generator) or 2 (External microphone). I migrated AF, RF, Image, LPF and Test ADC I/Q terminal tools to the standard ASCII-art graphing tool I developed. Previously every tool had its own piece of code, which of course were copy-and-pasted from each other and largely similar. The advantage is also that the standard ASCII-art graphing tool I developed, also has an interface to display a miniature version of the graphs on a 20 x 16-pixel canvas, shown in a 4 x 2 character section at the right-hand side of the LCD. This means all these sweep tools are now also available on the LCD and buttons, without needing to use the terminal emulator to see them. They are all under the "Hardware tests" menu. I created a new tool called "PA mod. test" specifically to check the operation of amplitude modulator. This is under the "Hardware tests" menu both on the terminal interface and the LCD user interface. Attached is an example of a correctly functioning amplitude modulator. The x-axis shows the DAC value, the y-axis shows the measured PA voltage. A correct result is a straight line that goes (almost) from zero to (almost) the QMX supply voltage; a 12V unit will saturate at about a DAC value of around 2500 as shown. The Hardware tests / Diagnostics screen is now also available on the LCD interface. Here there are 6 screens, which you scroll between by using the Tune knob. You i

Hello, I tested the internal microphone in the menu microphone test. Nice. Now a question: once the beta firmware results in a release, what will be the way to transmit? All controls seem to have already a function and there seems to be nothing left for the PTT function. Jindra

Hi all, Yesterday, I finally found the time to finish building my second QMX (Rev.2, 10m - 20m). Initial setup was easy, and after loading the latest firmware, all tests ran smoothly. Today was its first use, which was also successful with a few FT8 QSOs. But after about 3 hours, the QMX said goodbye with a loud pop. C107 looked like the picture below: https://www.bitquell.de/nextcloud/index.php/s/cf9tbs844aW2mgq I can't identify a cause for this defect. The QMX is built for 9V and was powered by the stabilized 9V output of a TelentCell LF4100. The antenna was a precisely tuned vertical. Will replacing C107 be enough? I'm worried about Q107. Could the burn that can be seen in the picture have been caused by C107, or is Q107 also defective? 73, Joerg DG0JDE

Do any of the commercially available hand microphones for existing QRP radios work with the new QMX SSB? Or perhaps pre-wired adapters for those mics already in the marketplace? Bill W3WJ

I just upgraded to the 027 firmware on my QMX, from 018. Being able to select the CW filter is very nice, but I don't understand how to enable cascading or compounding of two CW filters. The manual says there are two CW filters - 300 and 500 Hz, yet the submenu shows 8 filters, ranging from 50 Hz to 500 Hz. Thanks and 73, Steve, N2IC

Hello! I am trying to find right settings to start work with WinLink and VARA HF threw QMX. CAT connection is OK. The only problem here is that when I choose some Gateway channel QMX always switches to USB mode from DiGi. But it is not a big deal to return back to DiGi manually. The main problem is that when I start connection with the chosen channel QMX shows two dots as TX status. Which means that audio level from PC is too low. But I've put it to maximum. And everything works fine with WSJT-X and JS8Call. So problem is definitely with some WinLink VARA HF settings? Can smb help? Hans, did you try to use WinLink with QMX?

My QMX is working perfect with 12V, but I would like to try 9V to reduce power on FT8. By lowering voltage with a regulated power supply, qmx is going off at <10V (qmx seems not to be completely off, but there is no audio and no display). By increasing voltage again, QMX is starting again at >10V (without pressing "On/Off knob). At exactly 10V QMX is alternately going on and off. The minimal voltage in protection settings is 7V, why isn't it working with 9V? Vy 73 and thanks in advance, Stojan, DK4SR

On 4/21/25 I had a CW practice / rag chew session on 20 meters. I worked no stations: Conditions were OK. SSN = 108, SFI = 156, A = 14, K = 5. I heard several very weak stations calling but they were too weak to work. My next CW practice session will be April 23 at 16:00 EDT / 20:00 UTC on 20 meters. Anyone and everyone is welcome. This practice is intended for operators who are new to CW or they need some practice. IT DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes are OK. Poor fists are OK. Slow speed is OK. Really slow speed is OK. This practice is meant for you to improve your CW. I will do my best to adjust to your skill level. Operate at any power level. If several stations show up, I will operate as a round-table control station. I will do it as a round-table so everyone gets a chance to transmit. Please listen to my directions. Details: Date - April 23 2025 Time - 16:00 EDT 20:00 UTC Band - 20 Meters How to find me - I will find a clear frequency and call CQ. Go to the Reverse Beacon Network and search for my call sign AB8DF. That will tell you what frequency I am on. Tune your station to that frequency and if you hear me give me a call. If there is a QSO in progress, please wait for a break in the action. Then send your callsign. If I hear you, I will invite you to join the QSO and start a round-table QSO. Reply to this email if you have questions. IT DOES NOT MATTER HOW POOR CW IS Ed AB8DF