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Audio level request
12
I would like to block Digi mode audio from going to the earphone jack. The audio levels are painfully loud when adjusted for correct usb output to WSJT-X. I am afraid to switch between sidebands or to CW without removing headphones first. Any Suggestions ? QMX+ with 1.02 . de VK6XT
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Tune SWR on QMX+ always shows SWR <1.05
14
Hi, I wanted to tune my magloop antenna with the "Tune SWR" tool in the QMX+ menus, and no matter what I do with the antenna, the SWR never goes above 1.04 or so. That cannot be correct, as I'm using a magloop. Any tips on what I'm doing wrong?
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QRP Labs kit shipping status 20-10 FS
The price of success! My Factory built QMX hiband can be in your hands in a week or so. 12- volt build, enclosure, .027 installed. Works perfectly. Email sfab43@ho**ail.com for more info. Steve JS6TMW/AI6KX
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QMX+ issues
2
My QMX+ was working but when I powered it on this morning the display backlight is not on and the display shows a row of black blocks. Does anyone have any thoughts on where to start troubleshooting. +V or +12v has 12v, VCC has 5.1v, and VDD has 3.3v. I have had some issues with this unit. The 78M33 failed. When I tried to remove it the two small pads lifted. I currently have the 3.3v being supplied by a small DROC 3.3v buck converter. It was working well as of yesterday, I completed several FT8 and SSB QSOs.
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Hello, I recently build QMX+ and noticed a huge noise floor and wistling a 6 m. Therfore I measured sensitifity using a signal generator. Band [MHz] Sens [dBm]@Noise+10dB Noise [dB] 1,85 -100,0 0 3,65 -106,0 0 5,35 -107,0 6 7,07 -107,0 0 10,14 -110,0 2 14,23 -107,0 1 18,1 -103,0 4 21,04 -99,0 9 24,9 -97,0 7 28,1 -103,0 5 50,5 -79,0 20 Method: injection of signal Rx frequency + 1,1 kHz Mode: Digi Noise: signal detected by WSJT-X Sens: Noise floor + 10 dB Noise floor is increasing by frequency, but at 6 m wistling and digital noise make RX unusable. Output at 6m is about 2 W at 9V Vbat (12V Version) 1,5 kHz wistle starts at 20 m and is increasing by frequency Using wsjt-X i evalating waterfall diagram: (QMX+ at 50 Ohm) AVE:1, cumulative Noise [dB] : signal by WSJT-X signal in waterfall diagram AU QMX+ freq [Hz] freq [Hz] freq [Hz] freq [Hz] freq [Hz] freq [Hz] Frequency [MHz] Noise [db] Noisefloor 500 1000 1500 2000 2500 3000 1,84 0 0,2 0,2 0,2 0,8 0,2 0,2 0,2 3,57 0 0,3 0,3 0,3 0,7 0,3 0,3 0,3 5,3 1 0,5 0,5 0,5 1 0,5 0,5 0,5 7,04 5 0,8 0,8 0,8 1,1 0,8 0,8 0,8 10,1 1 0,5 0,5 0,5 0,5 0,5 0,5 0,5 14,1 1 0,5 0,5 1,3 2,8 2,1 0,5 1,5 18,1 5 0,8 1 1,8 2,3 2,1 1,1 2 21,1 7 1 1 2,1 2,6 2,1 1,1 2,1 24,9 7 1 1,2 2,7 2,8 2,7 1,3 2,5 28,1 7 1 1,2 2 1,5 1,5 1,2 2,2 50,3 22 1,8 2,5 3,8 4,2 3,9 2,8 3,8 At higher bands 1,5kHz signal is constant and independent from RX freuqency. At 6m additional audio signals are appearing. 6m RF Filter seems to be ok. Any suggestions to detect cause? vy 73 Michael (DF6TV)
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#qmx plus assembly one LP and Band filter at the time
6
#qmx
Hi Everyone I was wondering if is possible to assemble only one band filter at the time on a qmx plux rev3, this means I have assembled the all QMX leaving out only the toroids of all the filters, the LP and BP ones. Now next I have assembled only the 160m LP and BP and test the filters. The swipes look normal on the 160m. Next is to test transiting to a dummy load only this band, but I get the swr protection kicking in and no power out. voltages look normal. running a swr plot on 160m shows swr 10 on all graph. The main idea is to tune filters one by one with space for the soldering iron making it easy. I have reviewed soldering of transformer and swr brigde plus the jumper to the bnc is in place. My question is, Is it expectable that the SWR is High when only the filters for one band are on the board or this means something else is already wrong from the beginning. Thank you a lot 73 Azgael
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QMX PLUS
5
Hi all I have a qmx plus and I ran 13.6 volts into it on a first time power up it worked for abt 5 min then it shut dow. Then i read about the max of 12v vcc. I am assuming that I lost the buck converter. I have replaced all the sbject transitors that showed bad via the ohm meter still no joy. does anyone of you smart ones have test point diagram fot the buck converter so i can trace it and trouble shoot . thanks you a bunch Joe
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Why no AGC for digital modes, as other modes?
6
To Da Wiz; thank you, and a request, to make it better. Personally, I would appreciate the choice to use AGC, with my QMX+, or not, for all modes. I have used fast or slow AGC with my FT-990 and TS-790A for years, for different modes, and have found no noticeable performance penalty, except that the sound from no AGC was harsh and undesirable, and the S meter unusable. Some folks will not RTFMs to turn off the AGC, or properly tweak other software or hardware, and complain about imagined "bugs" - but for this ol' geezer, the choice would be appreciated, and I promise I will not whine about the consequences ;-) Thanks for a hearing, DA Ol' Dog, wa4hei
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OoT-RADIO HIFI TAMAGUCHI
2
Hello there, I found something amazing is possible. We need intelligent friends and we want to speak with them on many different topics. Do you remember that Tamaguchi baby robots need 24 hours of attention ? I found that it's possible to train large language models lot smaller than chat gpt , free , open source and expandable and than load that model in to 90 dollars worth of raspberry pi 5 and add to that chip an oled touch sensitive screen and a ram and than you have a box you can carry around and chat with it I am thinking of training and expanding the mini llama llm model 1GB- or a 7GB one with stereophile magazines - around a 60 years collection - and with some large amateur radio magazines collection , arrl books in 80 years - not all of them , only I can find free pdf - and electronics , physics books. I can reach hundreds of them But I have two ways to walk. The first one is to translate every book and magazine into Turkish and train the mini llama OR other LLM with 800 000 pages of Turkish and the same amount of English data. It would take 2 weeks to translate the data into Turkish and another 72 hours to train the LLAMA or larger model and 72 hours to optimize it with a GPU card. BUT I found that it's possible to hire a GTX 1080 12 GB GPU WINDOWS 10-11 Computer from Shadow PC company for 29 dollars per month. Computer memory is 256 GB. Every Turkish or foreign radio or hifi amateur can use this . I will publish all the data free at GITHUB. Mustafa Umut Sara? Istanbul TA2JCO , 73
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Hi all Well I got back to Dayton and after some work to release my suitcases full of electronics, which were impounded by customs at our local airport, all is well. I have a large backlog of sleep and emails to catch up on, as well as the jet lag... Since the SSB firmware beta release at the end of March, sales volume doubled compared to the normal monthly average. The waiting list for assembled radios also doubled (see attached chart which includes Dayton booth orders for assembled transceivers). Unfortunately I am informed by my colleagues that some kits have run out before the new batches arrived. It takes several months to arrange manufacturing of a batch of 1,000 QMX or QMX+ kits, including component procurement from various parts of the planet, PCB manufacture and SMD assembly, preparing the kits of through-hole parts etc. It's a little difficult to judge the timing exactly. So: QMX: no stock. All through hole parts are either on hand, or on the way. The PCB assembly is completed and just pending shipment. All QMX kit and assembled radios orders are waiting for this new batch of QMX boards to arrive. QLG3 GPS: no stock. There was an unexpected lead time on the E108 module but they were delivered yesterday. Now pending the SMD factory to assemble the boards, they will be shipped (along with lots of other board batches I ordered). Any QMX+ orders that include the QLG3 option are pending the arrival of the new batch of QLG3 boards. I updated the shipping status page: https://qrp-labs.com/status We have several other kits that are low on stock (including QMX+) but the new boards and parts are expected to arrive before the stock reaches zero. Thank you for your continued support. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl
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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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