Date   

Quick videos about the latest QDX News

Ryan Flowers
 

Hi everyone,

I've been trying to do small videos to condense the latest info about the QDX into one 5 minute segment. If you have had a hard time keeping up with all of the threads about QDX, I've got the latest in this video. I'll update this thread with new videos as they come out so as to not spam the group with new topics constantly, if that's alright? I hope you all find them helpful.

I'll also be doing a full QDX series of videos when mine arrives. Construction tips, walk throughs etc. I'll post those in a different thread when the time comes.

This video covers the sale of the first batch, amplifiers, bands, and availability of the next batch: https://www.youtube.com/watch?v=M_8pi-vxJss

73!
--
Ryan Flowers - W7RLF
MiscDotGeek - QRP and More

QCX Mini "Mini Tip" Series 

QCX Mini Troubleshooting and Repair


Re: Signal Synthesizer from QDX Question for Hans

Ziggy
 

Well, FWIW one of those 'semiconductor inventory' sites shows stock at some vendors : <https://www.ic2ic.com/search.jsp?sSearchWord=STM32F401RBT6>

Hard to know if any of that's real though. Or if they are reputable. Hopefully Hans will find a source and we can look forward to another batch before 2027.

On 10/11/2021 7:59 PM, Fred Spinner wrote:
The R package (64 pin LQFP) devices look to be unobtainum now.  Oddly enough other ARM manufacturers don't seem to have the issue that STM is having or not nearly as badly. Unfortunate.  I have several of their developer kits myself. 

The only delivery date estimate that I see for your specific chip is 5/22/22 from Newark.  Maybe 2019 isn't going to end soon after all like I thought... 

I will keep looking for you and let you know if I find a pin compatible ST device.  The 410RET might be available in a month according to Newark but I don't know if the builtins on that chip are okay for what you are doing with the QDX.   They have far too many varieties of parts, maybe that's a big part of their issue. 

Fred W0FMS 


On Mon, Oct 11, 2021, 3:54 PM Hans Summers <hans.summers@...> wrote:
Hi Fred

Yes, the two problem chips are the STM32F401RBT6 and the AK5386. Everything else is easy to get. I actually have about 390 of the AK5386 chips. So if I could just find 390 of the STM32F401RBT6 I could make 390 more QDX immediately. 

Moving to different chips for these two wouldn't be the end of the world, but would involve development work. 

73 Hans G0UPL


-------- Original message --------
From: Fred Spinner <fred.spinner@...>
Date: Tue, Oct 12, 2021, 1:37 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Signal Synthesizer from QDX Question for Hans
Code to do the 90 degree phase shift outputs with something like an Arduino and the si5351 or Chinese clone chip is readily available if you search for it.  So is sample WSPR code using phase shift i2c commands. 

The code for the STM32 is going to be another issue as it's the heart of the receiver and is the actual secret sauce.  But even there... are projects using ARM cores for receivers like the "KeithSDR" project that uses Hans' QSD board as the baseband and a Teensy 4.0/4.1 with a CODEC board.  So I gave you two hints if you want to roll your own from scratch... 

Unfortunately I suspect that Hans will need to completely find a new audio chip for the next run.  He could probably use an F446 chip for the STM32 instead of the 401 ($5 more) and those appear to be in stock at ST Microelectronics.. But it's insane.. Almost all types except the cheapest ARM processors are sold out now with no lead information.   

The "AK" audio chip factory burned for 82 hours in October 2020 and at least Digi-Key claims those CODEC chips are now obsolete.  Only their highest end stuff seems to be coming back.  In theory I2S is a standard though so in theory going to a different chip isn't impossible.  There are in stock substitutes.  Maybe the audio CODEC IC should go on a daughter board in the future... Who would have ever guessed... 

Perfect storm unfortunately for this product... But it's still Uber cool and being a SDR, those changes are quite doable.  I am sure Hans will be back with more eventually.  Things look a little better for chip supply after the first of next year.  We will see. 


Fred Spinner W0FMS 


On Mon, Oct 11, 2021, 1:49 PM Cox <lstoskopf@...> wrote:

I know that your code for the QDX is probably more than a bit closed source or it would soon be underbid with an inferior product.
Until this parts mess if over, is there a chance that you could take your code for the direct synthesis of the digital signal into a simple Si5351A/available chip and sell a kit or such.  I was going to take your QDX and down convert to 630M and the band below, but betting that you could generate those signals directly.  A product for your SPARE time.
Thanks,
N0UU

 


Re: QDX first batch ordering.... Done!

Mike
 

Are we going to be inundated with 450 posts claiming success in ordering the
QDX and many more bemoaning ther failier?
Who the hell cares, its off topic, surely.

On 11 Oct 2021 at 11:04, Jeff | VA2SS via groups.io wrote:

Done and truly happy! :-)

Waiting for the new baby now...

73
--
Jeff | VA2SS


Re: New kit: QDX - QRP Labs Digital Transceiver

N7IHQ
 

On Sat, Oct 9, 2021 at 09:09 AM, Fred Spinner wrote:
Will have to think about PSK.  I think the issue without an external phase modulator would be that the resolution of the synth would not be fine enough.  In theory FSK and PSK are directly mathematically related but yeah to actually do it...
PSK using an amplitude modulator:
A low power PSK31 transmitter using a Class-E power amplifier and envelope modulation

Jim
N7IHQ
 


Re: I win a good bet...

Jim Manley
 

I’ll bet the International House of Pancakes (IHOP) is positively green with envy!!!  I wonder if IHOP has a location inside the UN HQs building in New Yawk (the correct phonetic spelling and pronunciation by us natives there and in New Joisey!).


Jim  KJ7JHE
Lame Deer High School Amateur Radio Club  KJ7JKU


On Mon, Oct 11, 2021 at 4:18 PM Mike - N5AQM <n5aqmdb@...> wrote:
We will need to change the term used when something sells VERY fast from "Selling Like Hot Cakes" to "Selling Like QDX's"

I don't think Hot Cakes ever sold that fast!

I knew I wanted this without knowing much about it. Only what a friend told me on the air the other day. Now I can sit down and see exactly what I purchased!  Already built a mini and have alot of fun with in on WSPR and a little CW. Always enjoy building a good kit and putting it on the air. Hoping for a QDX for the high bands soon also...


73
-Mike


Re: Up-to-date QCX+ tips as of July 25, 2020 #qcx+ #enclosure #manual #case

Michael - wb6csh
 

I did NOT drill out any of the M3 nylon nuts to mount the LCD to the PCB. I'm running into a problem on the potentiometer (R1) side of the PCB; The M3 nut cannot rotate since it is forced up against the rear of R1, when it should be free to tighten up and hold the PCB and the LCD together. Any solutions from anybody?


Re: New kit: QDX - QRP Labs Digital Transceiver

Ryan Flowers
 

Jim, check out JS8Call. It's exactly what you're looking for, and there are more and more people using it all the time. It's grown quite a lot in popularity. https://js8call.com/
--
Ryan Flowers - W7RLF
MiscDotGeek - QRP and More

QCX Mini "Mini Tip" Series 

QCX Mini Troubleshooting and Repair


Re: New kit: QDX - QRP Labs Digital Transceiver

N7IHQ
 

The QDX should work with Olivia also. Although Olivia is great for weak signal QRP, it has a long latency. I wish there was more activity using the newer conversational MFSK based modes like FSQ and DominoEX. I have no interest in the automated modes like WSJT-X.

Jim
N7IHQ


On Sat, Oct 9, 2021 at 02:20 PM, Johan Bodin wrote:

QDX will probably work well with FSQ / FSQcall too. A fun and efficient keyboard-to-keyboard mode developed by ZL2AFP and ZL1BPU.

    https://www.qsl.net/zl1bpu/MFSK/FSQweb.htm

FSQ is supported by FLdigi as well :)

73 de SM6LKM, Johan
 
Hans Summers wrote:
QDX can do any sequential FSK mode. That includes FT8, JS8Call, WSPR, JT4, JT9, JT65, RTTY, others I'm sure... but does not include phase shift modes (PSK31) or modes transmitting more than one tone simultaneously; for those a real SSB exciter really would be needed. FLDigi includes RTTY and a bunch of other modes - I am not familiar with all the protocols of those modes, but if they are sequential FSK then they will work with QDX. QDX doesn't care about the mode, as long as the tones you send it are only one tone at a time!
 
73 Hans G0UPL
http://qrp-labs.com


Re: Antenna analyzer with Si5351 #antennas #si5351a

Steve in Okinawa
 

Try it without the diodes that are across the antenna input.


Re: New kit: QDX - QRP Labs Digital Transceiver

 

On Mon, Oct 11, 2021 at 06:38 PM, Hans Summers wrote:
QDX has no PTT output signal. But I will enhance the firmware to provide such a signal at a convenient pin header pad. Then it will be up to you to add some kind of connector such as a 3.5mm stereo jack, by drilling a new hole in the enclosure. 
I was thinking the same thing, that the output of the QDX will be extremely clean and it could be a good candidate for use with a suitable external linear amp for those who want a little more output power. 

If there is a spare pin available on the processor for PTT and this was supported in a future firmware release, it would be pretty easy for a user to retrofit a simple transistor switch (normally doesn't need to source a lot of current) to provide external capability for PTT via a user installed jack.  I am not an expert on this, but I think that most amps require a short switching delay after PTT is exerted and before RF is applied (I think that for my Tokyo HyPower HL45B it was about 10ms) so perhaps in addition to a PTT ON/OFF parameter there could also be a PTT Delay that is user configured via the terminal UI and saved in Flash. 

Cheers

Michael VE3WMB 


Re: Printing QRP Labs manuals for personal use ? (copyright)

 

Hans :

Thanks !

Yes I was going to wait until the QDX manual gets updated before printing. 
I assumed that it would be ok to commercially print a copy, but when it comes to copyright it is always best to ask. 

Cheers

Michael VE3WMB 


Antenna analyzer with Si5351 #antennas #si5351a

NahuelArg
 

Hi everyone! I did an antenna analyzer with pic18f250, si5351 and sa612(Ne612). I have a hardware problem. It seems to work fine if I test for example with a impedance about 50 ohms. But when I test with a impedance like 100 ohms or 18 ohms the instrument lose accuracy. Anyone of the group that made some similar antenna analyzer could have a similar issue?  I will add some picture of the circuit just for show you how is the circuit diagram. Im using two outputs of the Si5351. One to test the impedance value and the other as "local oscillator" for feed the mixers. Any advice will be greatful for me! Thank you all for your help!


Re: Signal Synthesizer from QDX Question for Hans

Fred Spinner
 

The R package (64 pin LQFP) devices look to be unobtainum now.  Oddly enough other ARM manufacturers don't seem to have the issue that STM is having or not nearly as badly. Unfortunate.  I have several of their developer kits myself. 

The only delivery date estimate that I see for your specific chip is 5/22/22 from Newark.  Maybe 2019 isn't going to end soon after all like I thought... 

I will keep looking for you and let you know if I find a pin compatible ST device.  The 410RET might be available in a month according to Newark but I don't know if the builtins on that chip are okay for what you are doing with the QDX.   They have far too many varieties of parts, maybe that's a big part of their issue. 

Fred W0FMS 


On Mon, Oct 11, 2021, 3:54 PM Hans Summers <hans.summers@...> wrote:
Hi Fred

Yes, the two problem chips are the STM32F401RBT6 and the AK5386. Everything else is easy to get. I actually have about 390 of the AK5386 chips. So if I could just find 390 of the STM32F401RBT6 I could make 390 more QDX immediately. 

Moving to different chips for these two wouldn't be the end of the world, but would involve development work. 

73 Hans G0UPL


-------- Original message --------
From: Fred Spinner <fred.spinner@...>
Date: Tue, Oct 12, 2021, 1:37 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Signal Synthesizer from QDX Question for Hans
Code to do the 90 degree phase shift outputs with something like an Arduino and the si5351 or Chinese clone chip is readily available if you search for it.  So is sample WSPR code using phase shift i2c commands. 

The code for the STM32 is going to be another issue as it's the heart of the receiver and is the actual secret sauce.  But even there... are projects using ARM cores for receivers like the "KeithSDR" project that uses Hans' QSD board as the baseband and a Teensy 4.0/4.1 with a CODEC board.  So I gave you two hints if you want to roll your own from scratch... 

Unfortunately I suspect that Hans will need to completely find a new audio chip for the next run.  He could probably use an F446 chip for the STM32 instead of the 401 ($5 more) and those appear to be in stock at ST Microelectronics.. But it's insane.. Almost all types except the cheapest ARM processors are sold out now with no lead information.   

The "AK" audio chip factory burned for 82 hours in October 2020 and at least Digi-Key claims those CODEC chips are now obsolete.  Only their highest end stuff seems to be coming back.  In theory I2S is a standard though so in theory going to a different chip isn't impossible.  There are in stock substitutes.  Maybe the audio CODEC IC should go on a daughter board in the future... Who would have ever guessed... 

Perfect storm unfortunately for this product... But it's still Uber cool and being a SDR, those changes are quite doable.  I am sure Hans will be back with more eventually.  Things look a little better for chip supply after the first of next year.  We will see. 


Fred Spinner W0FMS 


On Mon, Oct 11, 2021, 1:49 PM Cox <lstoskopf@...> wrote:

I know that your code for the QDX is probably more than a bit closed source or it would soon be underbid with an inferior product.
Until this parts mess if over, is there a chance that you could take your code for the direct synthesis of the digital signal into a simple Si5351A/available chip and sell a kit or such.  I was going to take your QDX and down convert to 630M and the band below, but betting that you could generate those signals directly.  A product for your SPARE time.
Thanks,
N0UU

 


Re: New kit: QDX - QRP Labs Digital Transceiver

Dave Edwards
 

I for one will be a customer for the next round!

.....Dave

On 10/11/21 6:46 PM, Hans Summers wrote:
Hi Gwen

Many thanks for the very nice feedback and kind words. 

I'm glad you got through the pileup! My apologies to those that didn't. I should have produced more. But it's hard to judge and risky and expensive... I made these boards back at the beginning of 2020. I will now try to find a way to produce more QDX, even if it needs component changes. 

QCX-mini... The PCBs have spent about 12 days now waiting in TNT's warehouse in Hong Kong Airport. I actually called TNT this morning and complained that I paid extra for expidited express service so? TNT were very apologetic but told me there are severe capacity problems and all the flights are packed... It is literally waiting its turn. He said it should fly out Tuesday or Wednesday. Once it gets out of Hong Kong it's usually pretty quick thereafter. 

73 Hans G0UPL


-------- Original message --------
From: Gwen Patton <ardrhi@...>
Date: Tue, Oct 12, 2021, 12:41 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] New kit: QDX - QRP Labs Digital Transceiver
I was ready to click at 17:58 UTC. When it hit top of the hour, I refreshed the screen to get availability. Server hiccupped. Hit refresh again, got new screen showing available units. Hit the radio button for the case and continued. Went through the process, having to refresh the screen when it hit SQL hiccups. Got to the payment page, and it just stalled. Refreshed, went through the couple of screens it had to backtrack, and it stalled again. Refreshed and stepped forward again, and got success! Finished the transaction and have the confirmations that I managed to YOINK! one QDX and case. Whole thing took maybe 3 minutes. Worth the worry that I wouldn't get one.

Congratulations once again for a fabulously popular and downright appallingly wonderful rig, Hans! When I watched the video, I was completely gobsmacked at what you managed to cobble up. I don't care how much I hurt after I finish putting this gem together, I'll dope myself to the eyeballs once I'm done working with molten metal and sharp tools. I'm hoping this rig will work ok with my Gallium OS Chromebook (the only way to operate ham software on a Chromebook that's reliable). You mentioned that you run computers with Xubuntu there, and Gallium is based on Xubuntu, so I'm pretty certain it'll work okay. I'll have to make a new antenna for it, and put together a separate go-kit for taking it into the field. I've got the go-kit for the QCX-Mini almost done...need to finish up and tune the antenna, a Pacific Antenna trap dipole for 20 and 40. You've got an order for a preassembled 20m Mini sitting in your preorders that'll go into the kit with the 40m unit I already have, so I'm on tenterhooks for you getting the new shipment of boards and stuff and can get it built and shipped soon. (Not being a nudge. It takes as long as it takes.)

You've created some of the most amazing gear in the past few years. I bless that I was born in a time that lets me experience the sheer creativity displayed by people like you. It makes me love this hobby more and more, to have such wonderful gear to do it with. Kudos, Hans, for doing such groundbreaking and amazing work.

I'll probably try to find room in the case for a 9v PD trigger board, so I can just power it by running a USB-C cable from one of my PD power banks. I already have the board. I'll just have to carve a slot in the case somewhere I can mount the board safely. My QRP go-kits will all have USB-C power banks for running the rig. It works remarkably well, and the power banks are cheaper in the long run. (And I can keep my phone charged too!)

73,
Gwen, NG3P


Re: I win a good bet...

Mike - N5AQM
 

We will need to change the term used when something sells VERY fast from "Selling Like Hot Cakes" to "Selling Like QDX's"

I don't think Hot Cakes ever sold that fast!

I knew I wanted this without knowing much about it. Only what a friend told me on the air the other day. Now I can sit down and see exactly what I purchased!  Already built a mini and have alot of fun with in on WSPR and a little CW. Always enjoy building a good kit and putting it on the air. Hoping for a QDX for the high bands soon also...


73
-Mike


Re: Signal Synthesizer from QDX Question for Hans

Hans Summers
 

Hi Fred

Yes, the two problem chips are the STM32F401RBT6 and the AK5386. Everything else is easy to get. I actually have about 390 of the AK5386 chips. So if I could just find 390 of the STM32F401RBT6 I could make 390 more QDX immediately. 

Moving to different chips for these two wouldn't be the end of the world, but would involve development work. 

73 Hans G0UPL
http://qrp-labs.com


-------- Original message --------
From: Fred Spinner <fred.spinner@...>
Date: Tue, Oct 12, 2021, 1:37 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Signal Synthesizer from QDX Question for Hans
Code to do the 90 degree phase shift outputs with something like an Arduino and the si5351 or Chinese clone chip is readily available if you search for it.  So is sample WSPR code using phase shift i2c commands. 

The code for the STM32 is going to be another issue as it's the heart of the receiver and is the actual secret sauce.  But even there... are projects using ARM cores for receivers like the "KeithSDR" project that uses Hans' QSD board as the baseband and a Teensy 4.0/4.1 with a CODEC board.  So I gave you two hints if you want to roll your own from scratch... 

Unfortunately I suspect that Hans will need to completely find a new audio chip for the next run.  He could probably use an F446 chip for the STM32 instead of the 401 ($5 more) and those appear to be in stock at ST Microelectronics.. But it's insane.. Almost all types except the cheapest ARM processors are sold out now with no lead information.   

The "AK" audio chip factory burned for 82 hours in October 2020 and at least Digi-Key claims those CODEC chips are now obsolete.  Only their highest end stuff seems to be coming back.  In theory I2S is a standard though so in theory going to a different chip isn't impossible.  There are in stock substitutes.  Maybe the audio CODEC IC should go on a daughter board in the future... Who would have ever guessed... 

Perfect storm unfortunately for this product... But it's still Uber cool and being a SDR, those changes are quite doable.  I am sure Hans will be back with more eventually.  Things look a little better for chip supply after the first of next year.  We will see. 


Fred Spinner W0FMS 


On Mon, Oct 11, 2021, 1:49 PM Cox <lstoskopf@...> wrote:

I know that your code for the QDX is probably more than a bit closed source or it would soon be underbid with an inferior product.
Until this parts mess if over, is there a chance that you could take your code for the direct synthesis of the digital signal into a simple Si5351A/available chip and sell a kit or such.  I was going to take your QDX and down convert to 630M and the band below, but betting that you could generate those signals directly.  A product for your SPARE time.
Thanks,
N0UU

 


Re: New kit: QDX - QRP Labs Digital Transceiver

Hans Summers
 

Hi Gwen

Many thanks for the very nice feedback and kind words. 

I'm glad you got through the pileup! My apologies to those that didn't. I should have produced more. But it's hard to judge and risky and expensive... I made these boards back at the beginning of 2020. I will now try to find a way to produce more QDX, even if it needs component changes. 

QCX-mini... The PCBs have spent about 12 days now waiting in TNT's warehouse in Hong Kong Airport. I actually called TNT this morning and complained that I paid extra for expidited express service so? TNT were very apologetic but told me there are severe capacity problems and all the flights are packed... It is literally waiting its turn. He said it should fly out Tuesday or Wednesday. Once it gets out of Hong Kong it's usually pretty quick thereafter. 

73 Hans G0UPL
http://qrp-labs.com


-------- Original message --------
From: Gwen Patton <ardrhi@...>
Date: Tue, Oct 12, 2021, 12:41 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] New kit: QDX - QRP Labs Digital Transceiver
I was ready to click at 17:58 UTC. When it hit top of the hour, I refreshed the screen to get availability. Server hiccupped. Hit refresh again, got new screen showing available units. Hit the radio button for the case and continued. Went through the process, having to refresh the screen when it hit SQL hiccups. Got to the payment page, and it just stalled. Refreshed, went through the couple of screens it had to backtrack, and it stalled again. Refreshed and stepped forward again, and got success! Finished the transaction and have the confirmations that I managed to YOINK! one QDX and case. Whole thing took maybe 3 minutes. Worth the worry that I wouldn't get one.

Congratulations once again for a fabulously popular and downright appallingly wonderful rig, Hans! When I watched the video, I was completely gobsmacked at what you managed to cobble up. I don't care how much I hurt after I finish putting this gem together, I'll dope myself to the eyeballs once I'm done working with molten metal and sharp tools. I'm hoping this rig will work ok with my Gallium OS Chromebook (the only way to operate ham software on a Chromebook that's reliable). You mentioned that you run computers with Xubuntu there, and Gallium is based on Xubuntu, so I'm pretty certain it'll work okay. I'll have to make a new antenna for it, and put together a separate go-kit for taking it into the field. I've got the go-kit for the QCX-Mini almost done...need to finish up and tune the antenna, a Pacific Antenna trap dipole for 20 and 40. You've got an order for a preassembled 20m Mini sitting in your preorders that'll go into the kit with the 40m unit I already have, so I'm on tenterhooks for you getting the new shipment of boards and stuff and can get it built and shipped soon. (Not being a nudge. It takes as long as it takes.)

You've created some of the most amazing gear in the past few years. I bless that I was born in a time that lets me experience the sheer creativity displayed by people like you. It makes me love this hobby more and more, to have such wonderful gear to do it with. Kudos, Hans, for doing such groundbreaking and amazing work.

I'll probably try to find room in the case for a 9v PD trigger board, so I can just power it by running a USB-C cable from one of my PD power banks. I already have the board. I'll just have to carve a slot in the case somewhere I can mount the board safely. My QRP go-kits will all have USB-C power banks for running the rig. It works remarkably well, and the power banks are cheaper in the long run. (And I can keep my phone charged too!)

73,
Gwen, NG3P


Re: New kit: QDX - QRP Labs Digital Transceiver

Hans Summers
 

Hi Larry

Several people asked this question in various places. 

QDX has no PTT output signal. But I will enhance the firmware to provide such a signal at a convenient pin header pad. Then it will be up to you to add some kind of connector such as a 3.5mm stereo jack, by drilling a new hole in the enclosure. 

The 50W PA kit was not designed for high duty cycle operation. Digi modes are quite different to CW that the Amp was designed for. Therefore I recommend running the Amp at not more than 25W output (half power). 

73 Hans G0UPL
http://qrp-labs.com


-------- Original message --------
From: Larry Acklin <acklin@...>
Date: Tue, Oct 12, 2021, 12:57 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] New kit: QDX - QRP Labs Digital Transceiver
Any thoughts about QRO with the 50W amp? I suppose PTT would need to be derived from something. 

73 
Larry
KB3CUF 

On Mon, Oct 11, 2021 at 5:41 PM Gwen Patton <ardrhi@...> wrote:
I was ready to click at 17:58 UTC. When it hit top of the hour, I refreshed the screen to get availability. Server hiccupped. Hit refresh again, got new screen showing available units. Hit the radio button for the case and continued. Went through the process, having to refresh the screen when it hit SQL hiccups. Got to the payment page, and it just stalled. Refreshed, went through the couple of screens it had to backtrack, and it stalled again. Refreshed and stepped forward again, and got success! Finished the transaction and have the confirmations that I managed to YOINK! one QDX and case. Whole thing took maybe 3 minutes. Worth the worry that I wouldn't get one.

Congratulations once again for a fabulously popular and downright appallingly wonderful rig, Hans! When I watched the video, I was completely gobsmacked at what you managed to cobble up. I don't care how much I hurt after I finish putting this gem together, I'll dope myself to the eyeballs once I'm done working with molten metal and sharp tools. I'm hoping this rig will work ok with my Gallium OS Chromebook (the only way to operate ham software on a Chromebook that's reliable). You mentioned that you run computers with Xubuntu there, and Gallium is based on Xubuntu, so I'm pretty certain it'll work okay. I'll have to make a new antenna for it, and put together a separate go-kit for taking it into the field. I've got the go-kit for the QCX-Mini almost done...need to finish up and tune the antenna, a Pacific Antenna trap dipole for 20 and 40. You've got an order for a preassembled 20m Mini sitting in your preorders that'll go into the kit with the 40m unit I already have, so I'm on tenterhooks for you getting the new shipment of boards and stuff and can get it built and shipped soon. (Not being a nudge. It takes as long as it takes.)

You've created some of the most amazing gear in the past few years. I bless that I was born in a time that lets me experience the sheer creativity displayed by people like you. It makes me love this hobby more and more, to have such wonderful gear to do it with. Kudos, Hans, for doing such groundbreaking and amazing work.

I'll probably try to find room in the case for a 9v PD trigger board, so I can just power it by running a USB-C cable from one of my PD power banks. I already have the board. I'll just have to carve a slot in the case somewhere I can mount the board safely. My QRP go-kits will all have USB-C power banks for running the rig. It works remarkably well, and the power banks are cheaper in the long run. (And I can keep my phone charged too!)

73,
Gwen, NG3P


Re: Signal Synthesizer from QDX Question for Hans

Fred Spinner
 

Code to do the 90 degree phase shift outputs with something like an Arduino and the si5351 or Chinese clone chip is readily available if you search for it.  So is sample WSPR code using phase shift i2c commands. 

The code for the STM32 is going to be another issue as it's the heart of the receiver and is the actual secret sauce.  But even there... are projects using ARM cores for receivers like the "KeithSDR" project that uses Hans' QSD board as the baseband and a Teensy 4.0/4.1 with a CODEC board.  So I gave you two hints if you want to roll your own from scratch... 

Unfortunately I suspect that Hans will need to completely find a new audio chip for the next run.  He could probably use an F446 chip for the STM32 instead of the 401 ($5 more) and those appear to be in stock at ST Microelectronics.. But it's insane.. Almost all types except the cheapest ARM processors are sold out now with no lead information.   

The "AK" audio chip factory burned for 82 hours in October 2020 and at least Digi-Key claims those CODEC chips are now obsolete.  Only their highest end stuff seems to be coming back.  In theory I2S is a standard though so in theory going to a different chip isn't impossible.  There are in stock substitutes.  Maybe the audio CODEC IC should go on a daughter board in the future... Who would have ever guessed... 

Perfect storm unfortunately for this product... But it's still Uber cool and being a SDR, those changes are quite doable.  I am sure Hans will be back with more eventually.  Things look a little better for chip supply after the first of next year.  We will see. 


Fred Spinner W0FMS 


On Mon, Oct 11, 2021, 1:49 PM Cox <lstoskopf@...> wrote:

I know that your code for the QDX is probably more than a bit closed source or it would soon be underbid with an inferior product.
Until this parts mess if over, is there a chance that you could take your code for the direct synthesis of the digital signal into a simple Si5351A/available chip and sell a kit or such.  I was going to take your QDX and down convert to 630M and the band below, but betting that you could generate those signals directly.  A product for your SPARE time.
Thanks,
N0UU

 


Re: Chinese copies of uSDR/X

Hans Summers
 

Hi Manuel 

Of course you may call me a friend as I always mention you and consider you too as a friend. We had a few heated differences once but that is a long way behind us, and all forgotten now in the mists of time.

The problem of support... Well yes, I feel your pain. Support and also reputation... When something you designed with a certain level of performance gets produced with different components and a much lower level of performance, it gives a bad reputation to what you worked so hard on and that must hurt, too. It's a horrible situation. I've experienced that too. 

Price... It's a difficult one. There are many ways to price a thing. My way (QRP Labs way) is to try and design a thing as innovatively as possible so it uses least parts and is engineered optimally, and produce it as best and inexpensively as possible, then sell it at a price by multiplication by a factor, that gives me something to live on, let's me stay in my lab, and avoid being sent back to corporate rat race. It ends up a very good price and lots of people buy and enjoy and learn from it, and it builds a fantastic community and promotes our wonderful hobby. I believe you think in this kind of way too. 

But most of the world doesn't see things this way. Price is set by a supply and demand balance. A seller will try and make as much money as the market will let him make. This kind of seller doesn't care about our hobby, he just cares about his pocket. But this is what we find in almost every area of the world we live in. These uSDX sellers who don't care about anything except filling their pocket, are sadly the norm, not the exception. While there are people willing to pay those prices, these sellers will happily sell to them... Perhaps even more "sad" is the fact people actually are buying at those prices, and have some expectation of what they're getting, which is markedly different from the reality. 

73 insomniacly
Hans G0UPL
http://qrp-labs.com


-------- Original message --------
From: "Manuel; DL2MAN" <DL2MAN@...>
Date: Tue, Oct 12, 2021, 12:03 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Chinese copies of uSDR/X
When we started this project, it´s no secret that we had a little conflict with Hans at that time.
But I ensured him back then, that we had absolutely no commercial interests, and that is still true up to today.
I don´t know if I may call Hans a friend today, but we have a very open relationship and frequently exchange in a friendly way, so I think, we´re kind of friends today.

The Problem I have, with this chinese situation is not the fact, the chinese made that thing to money. 
In fact, now, because of teir sales, it´s starting to get popular, like the NanoVNA or the HackRF One.
The Problem is the High Price Tag they put on it. It was thought of as the lowest entry point for a half decent radio.
The Problem is the design errors they built into it, and people having problems come to the uSDX group and ask for help.
The Problem is they took something and not even had the decency to publish a schematic with their changes along with it, so one could at least support it. (at least in one case)
But we can´t stop that from happening, so our reaction to that is: Complete disclosure. Full Transparency.
Maybe this leads to some motivation for the chinese sellers to fix some of those problems.

73 Manuel; DL2MAN

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