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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_003 to it. These are the changes: Bug fix: Initial value for noise gate samples was 100 (should be max 99) - makes no real difference but it needed to be fixed Added TX indication underlining the A character when transmitting from USB sound card in SSB mode. Note that the two possible states for this indication are a single dot (indicating PTT has been applied and now the radio is in TX mode) and the solid bar (indicating audio is being received from the PC and transmitted). There is no double-dot like there is in Digi mode indicating insufficient volume, because in SSB mode the radio transmits whatever you give it, even if the volume is low. Bug fix: CAT command TQ1; did not cause transmit when in SSB mode. Now TQ1; and TQ0; work properly in SSB mode. Bug fix: Prevent button presses from accidentally activating VOX, which was happening due to sound picked up from the internal (cancellation reference channel) microphone when you pressed buttons right next to it, and that prevented band change because the second click of the double click was ignored because by then the radio was in transmit mode. All fixed! Now you can click buttons however you like and when button clicks are done, VOX is temporarily disabled until your button pushing frenzy is over. Power meter now reads Peak Envelope Power (PEP) when in SSB mode. Previously it was just reading a sampled value (NOT an average); so if the power meter was updated 10x a second, the updates would just randomly pick a value from the SSB amplitude envelope, which was most unlikely to be its peak value. Bug fixL Calibration hung at DAC 1300 when run on LCD. Now the calibration completes properly when run from the LCD. Many thanks for all the feedback so far, SSB in QMX is getting better and better! 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Hi all, I'm a new ham trying to build a power supply cable like this for my QDX or QMX+ to use my existing battery in the field: 12.8V LiFePO4 battery > 18AWG cable w/ ring terminals > inline home-brew buck converter > 18AWG cable > fuse (1.5A?) > 18AWG cable > 2.1mm barrel connector The part in bold is what I'm having trouble finding an obvious solution for. Is there a way hams typically build such fused cables without a whole lot of extra splicing? I feel like I'm missing something because I don't see much discussion about this or any pre-made assemblies like that. Sources for such an assembly would also be appreciated. I saw this thread but ordering from UK to US and cutting off the Powerpoles isn't a good option. /g/QRPLabs/topic/95334671#msg95573 Here's some background discussion on the buck converter build we're doing if anyone's interested in that. Thanks, Mike

The radio is a Ver. 1 QMX plus that in general performs exactly like I expect. It does not have the GPS option installed, and there is no battery in the clock battery slot. The radio is used for CW only. As the title suggests, I have an approximate 1000 tone on only 12M and 6M bands. It is internal, in that I can remove antenna and it's still there. It does not change in level or tone while tuning around the band. It appears to de-sense the receiver a bit, as a signal must be pretty strong for me to be able to copy it on 12M. There is normally a 'beat' frequency between the received signal and the tone when I can copy someone. I have run the I/Q sweeps in Putty, using a raspberry pi computer. The tone is present with or without the computer attached. The I/Q sweeps look very nice on the lower bands, and begin to deteriorate as the frequency goes up. They are still showing the two sine waves, but are a bit distorted( not a perfect line of x's ). This deterioration is also noted on 10M and 15M ( to some extent ) and the sweeps for 12M and 6M are not suspiciously worse than others. 10M works flawlessly, as do the other bands. The remaining filter sweeps look good, with some tweaking needed possibly, but totally functional as is. I have a set of QMX HB and LB radios to compare symptoms, and the HB QMX does not have the 'tone' on 12M when swapped into the system. I am curious what path to take troubleshooting this issue. I did not find anything in the archives that addressed this strange behavior. Thanks & 73 Dick W4PID

Just about to finish my QMX+ build and I have a voltage question. The kit was built for 12 volts. I have a 100 amp/hour lithium iron battery for vhf base station emmcom backup. At full charge, its just north of 14 volts. Would it be wise to install a buck converter in the battery box to limit voltage out to 12 volts for the QMX+? Thanks in advance - I really don't want to fry this little gem. -- Jim, W7EZN 73!

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

Hi All, My mid band QMX Rev.2 developed display problem after 4-5 months of good working. Firmware 1_000_027 I build 12V version. After switching on all seems ok and works, but after 20-30sec display becomes corrupted. Initially it is just a few letters but soon after that all text is corrupted and gibberish. When I switch off and on top row is just black boxes. If I leave radio switched off and detached from battery for day or so and switch it on problem repeats itself again. I mean first it works and then display problems start. I done this couple of times now and each time Initially it works and then after display stops to play a game. Connecting to computer through USB works and all diagnostics and LPF/SWR/etc... tests do not show anything unusual. Any ideas what's going on? I am not that knowledgeable to sort it out myself. Can you direct me what else I should check? --------------------------------- 73 de Marek SP9TKW

I would be grateful if smb can explain in detail what I need to do send e-mails threw QMX. I have no experience with Winlink and limited experience with FT8 data transfer. I have tablet PC (Win 8) with VARA HF and Winlink Express installed and I have QMX. What I need to do to set all these properly?

Hello i have received my assembled QMX+ a few days ago and go the power cabled assembled feeding this unit with 11.80v of dc. (12v model) I can putty into it and see the hardware tests pass, the data sheet shows all good on all bands. It powers up and down fine. I have not xmited w it yet. I can viewed the manual that i downloaded and printed out for vx.0027 of my software Still not sure of how to operate it. When i turned on practice mode or keyed i get a continuous series of dahs all the time. Even with key and cable disconnected. ???? If i put the unit in vfo mode it seems to go away. Volume., are and band changes seem ok. I got thsi to stop but not sure how?? on any band cw i get a continuous audio chuffing sound like its sampling or some such. I can use some help or guidance on this and i am not transmitiing until i get this sorted out. Can i or did i change a settting in the config when i puttyed in? Maybe its my ignorance of how it operates?? Thanks in advance Charlie k2cmc -- Charlie C. - K2CMC LICW/SKCC/NAQCC

Will USA tariff laws affect the import pricing of Hans’ great radios/kits into the USA?

This type of request needs to be submitted to the support desk at qrp-labs, not this user-supported forum. Stan KC7XE

Ok,,,, just for fun I thought I would try my QMX+ with my KXPA100 amp and *it works great*... puts out about 50 watts with QMX+ driving it. I made my first SSB contact in QRP mode on 20m the other day but since the bands are not that great and I have this amp normally hooked up to my KX3 I thought I would see how hard it was to get working... EASY.. just set the PTT on each band to "grounded" and I have a TRS-to-RCA breakout cable (not sure I have that but...) once I figured out which RCA plug was which, I just plugged it into the KXPA100 and bingo! Plus since the KXPA100 has an ATU built in I can use that as my tuner ! Pretty cool...just wanted to toss that out there in case anybody else was thinking "QRO".... Of course.. NOT a cost-effective solution...;-) Mark

The wiki page QMX QMX_plus debugging environment has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions

Hello i have received my assembled QMX+ a few days ago and go the power cabled assembled feeding this unit with 11.80v of dc. (12v model) I can putty into it and see the hardware tests pass, the data sheet shows all good on all bands. It powers up and down fine. I have not xmited w it yet. I can viewed the manual that i downloaded and printed out for vx.0027 of my software Still not sure of how to operate it. When i turned on practice mode or keyed i get a continuous series of dahs all the time. Even with key and cable disconnected. ???? If i put the unit in vfo mode it seems to go away. Volume., are and band changes seem ok. I got thsi to stop but not sure how?? on any band cw i get a continuous audio chuffing sound like its sampling or some such. I can use some help or guidance on this and i am not transmitiing until i get this sorted out. Can i or did i change a settting in the config when i puttyed in? Maybe its my ignorance of how it operates?? Thanks in advance Charlie k2cmc -- Charlie C. - K2CMC LICW/SKCC/NAQCC

Is the QMX itself in any way capable to negotiate the required voltage with the power bank PD? In other words is a 12V trigger cable required or not? I feel more comfy with a trigger cable as it steers away from any negotiating. 73 es dx

In the QMX+ does the polarity of the 10-turn windings on T507 (part of the Fwd/Ref power detector) matter? In the assembly manual the photo looks like they're wound to be mirror images of each other. I wound mine so the turns advance clockwise on both sides. Will this cause a problem with RF power measurement? Or worse yet, cause a serious impedance mismatch for the lowpass filters and finals?