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Hi everyone. With the release of the SSB firmware out of beta, I thought I would make my offer to source K6ARKs wonderful little microphones, which can be found here: https://www.printables.com/model/320559-mini-microphone-for-qmx-trusdx-usdx-kx2-and-kx3, one more time. Adam (K6ARK) made a super fantastic little miniature mic case, and they work with the QMX quite nicely. I print the cases in PLA, and have the following colors available: Black, White, Grey, Navy Blue, Orange, Light Green, Red, Gold, Purple, Sand Stone, Light Blue Stone, Turquoise stone, and Marble Stone (The stone colors look like marble or granite - little flecks of darker color in them - The marble one winds up looking like bleached bone). The kit includes: 3D Printed case in PLA 3.5mm jack Electret Mic Element Microswitch for PTT For each mic, $10 for kit, $15 fully assembled and tested. This price includes shipping in the US. I am happy to make you more than one, some people want one for home and one for the go bag, that's great. You will need to provide your own AUX cable (3.5mm male to male) to go between the mic and the radio. I have had several ask what cord I am using, So I have included this link to one I am using and that I test all my assembled mics with; it seems to work quite well: https://a.co/d/36GDDXf (This is a shortened, non-affiliated link to Amazon.com page for the cable I use) If you are interested, send me a private email, and I will send you payment details. My email address is good on QRZ.
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Pop! Oops, blew a BS170 in my QMX, my fault. Lesson learned
8
Hi all, I learned from the operating manual that the SWR measurement is from the center of the band. I had forgotten this trying to squeeze a POTA activation while on a business trip this week. My SWR reading was 2.00, on 20m . Not great but I was too lazy to pull my antenna out of the tree and use the shorter segment which usually gets me 1.4. (EFRW 71¡¯ with 41¡¯ segment) I have a EFHW which will work better but haven¡¯t put it together yet. To test propagation, I decided to hook up the iPad and do a little FT8. I think the SWR was much worse down at that frequency because halfway through my first transmit cycle.. snap! I knew what happened right away. I did have SWR protection on and set at 3 but it didn¡¯t stop the pop. Radio still received but I shut it down. I ordered some BS170¡¯s from Digikey for a whopping 24 cents a piece and they¡¯ll be here tomorrow. I think I should replace all four but thought I¡¯d ask from those who know if it is likely the others are damaged too. Hopefully nothing else is damaged and I¡¯ll recalibrate as well. Love this radio and pack it in my bag when I travel.
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So I replaced the suspect Q516 and seems I have a happy QMX+ woohoo. No more fluctuating bias current and silence in the headphones on key up. Thanks a heap for the help guys. You got me on the right track. Cheers Ian ZL1HIM
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New Information site on T41 SDR and DSP with microprocessors.
Hi Everyone, I have created, with Jack's help, a new site all about the T41-EP at: https://t41sdrtransceiver.wordpress.com This is an 'information and background site" for the T41, not an open forum - the SCHR is the place for posting comments/suggestions about the T41.It also has general info on SDR radio design and DSP. I intend to post lots of photos of user-built T41 rigs. I have a few already included, but would like more. If I get enough, I will create a separate gallery page of just T41 builds. Photos should be sent to me directly at albertfpeter@... with a brief explanation. I reserve the right to edit any comments for brevity. Let me know what you think. Regards, Al Peter AC8GY
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Does anyone happen to know of a manufacturer or US distributor part number for a replacement rotary encoder switch for the QMX? My left hand (power, band, mode) rotary encoder switch appears to have failed. I checked the assembly manual for details, but I'm coming up short.
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[OT] - Winkeyer and Ham Radio Deluxe (DM780)
Hello, Can't find this answer anywhere and this is my last try. I would like to properly key my transceivers from the computer with a dedicated keyer. So far my K42 worked very well, but it is a standalone solution (no computer). I would like to know if anybody is using the Opencw Keyer with Ham Radio Deluxe, instead of the golden standard K1EL Winkeyer. it seems to me that Opencw Keyer does implement Winkeyer protocol version 2, while now the "standard" is 3.0 / 3.1. I asked to HRD support but they said they only support "original" Winkeyer chip based keyers. Thanks in advance. -- Giuseppe Marullo IW2JWW - JN45RQ PS: I know that my QrpLabs radios do have an internal keyer, just in case...
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QMX SSB low output
13
Greetings to the brain trust. I have a kit built QMX which is awesome and works great on CW. I have upgraded to the 1.02.000 ( the latest firmware) and added a QRP GUYS mic. Everything seems to check out in the hardware tests, but it seems very low output on SSB. I've set the mic. gain to 75 which seems to help, some. Any ideas on trouble shooting? Thanks in advance. WX7J Doug
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QMX+ printed assembly manuals
10
Do most folks print their QMX+ assembly manuals or just use/read them online? While I do own a Brother inkjet, does anyone know of a cheap online service to print single copies? My local (good folks) printing company estimated about $30 for 2-sided color printing of 100 pages. Thanks de
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T507 Winding Direction/Handedness
4
#building
#QMXplus
#transformer
Does the winding direction/handedness in each side of the T507 binocular core transformer have to be the same. Hans stated in his 2023 Evolution in Radio Design paper (pg 21) that: "... Here we use a more compact method, a binocular core. The two transformers are each wound in the two separate holes. As far as the binocular core is concerned, what happens on one side is electrically invisible from what happens on the other. So the use of a single binocular core instead of two toroids is a parts count reduction benefit and also in our case, crucially, helps reduce the space required, which in QMX Is at a premium." I've wound one side (10 turns) and started the second but I think I've reversed the direction and want to know if I have to start it over. BTW if there is a trick to getting these windings tight and neat I haven't figured it out. My other torroids turned out OK looking but this one is not behaving. Probably does not matter but I would prefer it look pretty (pilot's axiom - "If it looks right it will fly right").
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QLG2 for Icom 9700
4
#gps
#icom
#qlg2
My objective is to use a QLG2 to provide GPS information to my Icom 9700 (because I want to do so). My QLG2 is built and tested. I can communicate via a PuTTY terminal. I can see GPS data in the terminal window. I have connected the QLG2 to a TTL-RS232 interface based upon the Max3232 chip. The connection to the IC9700 is made with a 2.5mm stereo plug. The SER data from the QLG2 is connected to the RING terminal on the 2.5mm stereo plug (per configuration specs in the IC9700 Basic Manual, page 13-2). Using my oscilloscope, I connect channel 1 to the ground and RING terminal on the 2.5mm stereo plug. I can see AND decode the data coming from the QLG2. When I plug this mess into my IC9700 i get ... nothing. I have checked and double-checked the Connections configuration for the data port on the radio. I have confirmed that the Settings are correct on the radio. Will someone please help me figure this out?!? I'm pulling my hair out...and I don't have that much to lose. I can't find more detail in my Basic or Advanced manuals. Google, Bing, and DuckDuckGo have stoped talking to me. I've been through the firmware documentation and the specs for the GPS chip on the QRP-Labs site. I am well and truly stumped. If you have read this far, thank you for your time. I hope one of you really smart people can help me with this.
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QMX SSB in mobile?
6
I have a QMX coming soon and was wondering now that SSB is included, do you think the QMX would perform well in a mobile environment? Perhaps with a amplifier/tuner? TY! Jeff
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QMX 60-15M Processor IC203 PB1 (Pin 36, LPF1 Q510 Gate control) Not Working
#output
#30m
#bias
#filter
#qmx
Good Morning! I just finished building a QMX 60-15M kit that was shipped 2-April-2025, and found no CW output on 20 and 30M. Here is what I've measured and found: The gate voltage on Q509 (LPF 0 pin diode switch) is 3.3V for 60 and 40M bands and 0V on all others (normal). The gate voltage on Q511 (LPF 2 pin diode switch) is 3.3V for 17 and 15M bands and 0V on all others (normal). The gate voltage on Q510 (LPF 1 pin diode switch) is 0V on all bands (not normal, should be 3.3V for 30 and 20M). If I short the drain on Q510 on 20 and 30M, I get power out for those bands, so the pin diodes and LPF 1 are working. The gate to Q510 is has continuity to pin 36 (PB1) of the processor IC203. Resistance of all three gate pins to ground is about 30 megohms. None of the gates are shorted to each other. I've tried all three of the most recent firmware releases (1_02_000, 1_01_007, and 1_00_027) with the same result. I've tried a factory reset. The Hardware Tests/Diagnostics for Transmit on 30 and 20M show high Bias SMPS currents of around 61 mA, and no TX power out. All bias currents on other bands are normal at 30 mA. Any suggestions for further testing, a different conclusion, or where to go from here would be greatly appreciated. Also, does anyone know of a way to test the ports on this processor? Thanks in advance, and 73, Gil, AA9FT
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Hi, When running the various diagnostic sweeps I find all bands except 160m seem reasonable similarities to those shown in the manual. But the 160m seems way off. Any ideas what may be causing this and what I should be checking? I'll include screenshots of the sweeps. Many thanks Ian
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Estimate for Release of version 1.2 of ABS solution for QMX+
5
I just/finally bought my QMX+ at Dayton FDIM. Is there an estimate for the upcoming release of version 1.2 of ABS solution for QMX+? Where can I find more details, ie pictures and documentation? Thanks de
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How to enable the internal mic on QMX+ 1.00.02
4
There are three menu choices for enabling mic input, 1-ext mic on paddle jack, 2-internal sound card audio (digi modes) and 3-two tone test audio. How do I enable the internal mic on the front panel? I'm new to this, just built the radio yesterday, I apologize if I'm not following protocol here. THANKS! -- Larry N2AJX
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Hi guys I have built a QMX+ Wound for 12V. FW 1_02_000 From the get go, on TX, I have in my headphones a pulsing sound. No tone to it. It¡¯s a fast pace pulse. Maybe 3-4hz. When using the SWR tune tool the led on my ZM-2 will flash at the same rate. Keying the mic and listening on a SDR I can hear the pulse in the background. I am unable to hear it in a CW tone on the SDR but it is in my headphones on SSB and CW. The pulse does not toggle the rf, it just seems to be embedded in it. On the face of it. It transmits fine. Randomly I get ear bending white noise on start up. (My QMX build went fine and its functioning well, go figure) Hoping someone might have a pointer on this. Have dummy load, dvm and power is meter on the way¡. Thanks in advance. Ian. ZL1HIM
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CW offset & sidetone in 1_02_00 (QMX)
5
Installed the latest firmware. I prefer a lower sidetone, so tried setting both offset and sidetone freq to 600. Normally run 580Hz, but it looks like 600 is the minimum value. This does not seem to persist, when I go back into the menu, I see it has changed back to 700... On my QCXs I just set sidetone freq to 580 and all is good. Any ideas pls ?
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How to enable transmit for winlink
8
Hi folks I have read most of the info on setting up with li k and the qmx...I seem to be able to control the radio and get a receive sig al shown in the vara waterfall. However, when I try to connect, you can see the pauses or bla k portio s on the waterfall, but the rig does not go I to tx mode. Appreciate hearing g what I might be missing. I have tried setting radio to flex and kenwood...same results Cheers Scott
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Hi, I have released a version 1.2 of the solution. Please refer to the readme front page file at the git repository with details: https://github.com/AC8L/QMX_Plus_Autotuner_Internal_Battery_Speaker/ While I am writing this note - a group buy with 35+ participants is happening for this same version 1.2 - organized by Cal (AD8Q) and Stan (KC7XE). -- 73, Sardar (AC8L, 4K6SA, VA3DUA).
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New QMX died while listening
2
I received my fully assembled QMX about a week ago, but dont have a mic, or a cw key yet. I got the high bands since I am a tech so i could use 10m now, and planning on getting my general in june/july. so all i have done is listen a bit. I was hoping to try digital modes with it sunday afternoon. but sunday morning, i turned it on to listen again and about 5 minutes in i change a few bands and then i hear a sharp sound out of my speaker and the radio goes dead. never to power on again. double checked the power supply which was good. even tried a second one and same thing, no power. i took some multimeter readings while it was unplugged and power doesn't seem to be shorted to ground. however measuring resistance between antenna and ground is very low resistance, like under 1 ohm. i haven't opened it up yet as i haven't heard back from Hans. not sure what next steps would be. Thanks for the help / direction. Ted
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Sat 8:39am
Sat 8:39am