Date   

Re: Use of the VFO/Signal Generator as a CW TX VFO #vfo

Steve Rawlings
 

OK - I'm getting desperate now!     

I have been reading the web page at:
https://cdn-shop.adafruit.com/datasheets/Si5351.pdf

I see that there is a OEB (output enable) input pin on the Si5351A.  If I pull OEB 'high' on receive, will the current VFO/Signal Generator continue to produce the selected frequency when OEB goes 'low'?

If so, I don't think that a software change is required: I just need to route a suitable TX/RX signal (from my TX) to the IC..

Does this sound possible?


Regards to all,
Steve
G4ALG


Re: QDX pileup

Hans Summers
 

Hi Jay

Your order went through, it is order ID 50202 and was the 242'nd QDX ordered. Check your spam folder, perhaps the confirmation email went there. 

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

On Tue, Oct 12, 2021 at 12:48 AM Jay Gustin via groups.io <jginaz=yahoo.com@groups.io> wrote:
I received a payment confirmation from PayPal but not from qrplabs. Hope it went through. 




On Monday, October 11, 2021, 2:16 PM, Pat <pat.ring1@...> wrote:

On Mon, Oct 11, 2021 at 01:52 PM, Fred Spinner wrote:
I guess I am glad I had it in the cart before 1800z..
I had it queued up and was hitting enter at 1759z.

--
Jginaz


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

Hans Summers
 

Violence is the solution. 

Normally I try not to incite violence. But in this case, you need to use FORCE on those screws. Get a good large philips screwdriver with a nice big handle... apply torque... everything will comply... 

73 Hans G0UPL

On Tue, Oct 12, 2021 at 6:52 AM Michael - wb6csh via groups.io <wb6csh7=yahoo.com@groups.io> wrote:

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: QCX WARC party - a good day at the office

John Pagett G4YTJ
 

I was only able to do the 1900z session yesterday with my 30m QCX classic. Two QSOs, Zdenek OK2BQN for a QCX to QCX contact, and Juan EA3CWT for a non-QCX contact. All good fun though.

John
G4YTJ


QCX WARC party - a good day at the office

Chris Wood
 

Good morning all,

I took part in the 1300Z session with the best result I've had so far.

OK2BQN for a QCX-QCX contact, DK5FN (KX3 and 15w), IZ3SOI, HB9WG  and F2QJ (all QRO).  Then just after 1400Z, UR5UEY.

I was using my 20m QCX-mini set to 30m with an external LPF feeding my 43m doublet at 8m agl.  So I was quite happy with that and thank you to all.

But the day got better.

An hour later I worked VK6XI on 30m FT8 for my first ever VK.  And in the evening I succeeded in ordering a QDX.

So, a very good day at the office and I hope others had an enjoyable day as well.

Look forward to the next QCX party.

Chris  G4CWS


Re: New kit: QDX - QRP Labs Digital Transceiver

Hans Summers
 

Hi Michael

Actually I realized that QDX already has a positive-going TX signal and that is probably sufficient as a PTT signal, and is present for example at pins 1, 4, 10 and 13 of IC5 74ACT08... it would not be hard to solder a small wire to pin 1 for example. It also has a negative going signal that could be used for amps requiring grounded PTT, this is at the drain of Q2... again it would not be too difficult to solder on a small wire. 

So no firmware change from me is even needed... but there isn't a convenient pin header position for example - so you would need to solder on a small wire in the right place to pick up the desired signal. 

Again - don't run the 50W PA kit at 50W on digi modes, the duty cycle is too high... derate to 25W maximum... 

73 Hans G0UPL

On Tue, Oct 12, 2021 at 3:47 AM Michael VE3WMB <mbabineau.ve3wmb@...> wrote:
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: Feature request please Hans #qcxmini

Jim Manley
 

Hi David, Jack, Allison, Et Al (whomever Al is and whatever he et for his most recent meal!!!),

This is going to appear verbose at first, but it becomes worthwhile.  I fully agree with the sentiments voiced here about thinking twice before lashing out at newbies, and then go take a walk, enjoy a refreshing beverage, cool off … and then don’t do it no matter what the case.  Moms are right when they say, “If you can’t say something nice … “

I’ve been educating and training (two _very_ different things) young(er) folks for 46 years on most matters regarding science, technology, engineering, and mathematics from the middle school through university levels.  When I was commissioned in the Navy, the shiny new All Volunteer Force had recently been instituted, and most of the recruits were no longer representative of the population at large.

This was particularly the case where many former college students and even graduates, that the Vietnam era draft had “strongly encouraged” to help fill the ranks, were no longer “volunteering”.  As I had overheard a very wise then-Colonel, and future Commandant of the Marine Corps and National Security Advisor, tell his junior officers, “Grow where you’re planted”, when they loudly complained that they weren’t seeing combat when SoDamn Insane was driven from power.

They weren’t yet aware (nor are most U.S. taxpayers, but refugees worldwide are) that about 95% of all real-world operations conducted by the U.S. military are humanitarian rescue and support.  Whenever a weather or conflict caused disaster balloon goes up, the President doesn’t ask where Air Force bombers or Army Divisions are, they ask where the deployed Navy/Marine Corps Amphibious Ready Groups and aircraft carriers are (the latter often have USMC tactical aircraft such as F/A-18s or F-35s embarked).

90% of the young men and women who are responsible for maintaining, repairing, and operating the extremely technologically complex hardware, software, and procedural processes to succeed in assigned missions have never been outside their home state, let alone the other side of the planet.  Many have never been more than 100 miles from where they were born.

The military gets a few months to turn raw recruits into personnel with a sense of responsibility for themselves and to their compatriots.  Most get another six months of specialty training and those enlisting for upwards of six years go through around a year of technically-intensive education and training.  Additional advanced education and training are provided in exchange for future reenlistment periods.

Only about 10% of high school students today can qualify to enter the military, with most disqualified by obesity and lack of physical fitness, felony illicit drug abuse, distribution, and/or violence, asthma/allergies, and poor educational performance, especially in even the most basic mathematics and science.  For an example of the latter, they can’t perform long division and fraction arithmetic, let alone simple ratio problems, percentages, and unit conversions … 

So, we in the military have to get them up-to-speed on what they were supposed to have learned in the previous 13 (often plus) years of school.  Community colleges have become the new middle and high schools, frankly because many junior teachers are thrown into middle school teaching because that’s where students with discipline issues haven’t yet been diverted into correctional programs.  The average new teacher is gone within two years, and 95% are gone within five years.

Part of this is because teachers in classrooms when No Child Left Behind was passed in 2004 have never had to take the ~30 semester hours of graduate level courses that teachers entering the profession later do (with attendant additional student debt).  Being senior now, those grandmothered/fathered (85% women) teachers typically have no idea what junior teachers have to sacrifice to get into teaching today.  The former get paid bonuses to supposedly mentor the latter, but the junior teachers have to show their “mentors” what’s supposed to be done by the senior teachers.

Since Boomer teachers with STEM degrees have essentially all retired, most STEM teaching jobs today are being filled by former humanities teachers who pass STEM cram courses designed to get them through the two or three 100-question subject matter tests for each discipline.  They often have little-to-no interest in the subjects, let alone take college courses to add a STEM BA to their resumes/curricula vitae (and a BS?  HA!), but are merely doing it to be paid  bonuses.

When I ask freshmen to describe what they know about math, they can generally only perform four-function arithmetic (maybe only with a calculator).  As for science, when asked to define the scientific method, most wind up referencing Newton’s Laws (I suspect that’s only because there are cookies with that name!).

Sorry to ramble, but perhaps now you have at least an inkling as to why Johnny/Juan/Jamal/… can’t numerate, and Jane/Juanita/Jasmin/… can’t hypothesize, not to mention all of the other most fundamental STEM skills.  This may also explain why you see such basic questions about concepts that you mastered early in your K-12 academic career.  It gets worse - most adults below the age of 50 are just as innumerate and scientifically illiterate, and they’re frequently parents or even grandparents-at-an-early-age who can provide no assistance when their progeny need help with homework.

We hams are literally a dying breed, with an average age in our early 70s.  There is a new cadre of young hams coming, but if they’re ignored when they wander into a club meeting, and aren’t actively encouraged to join and participate in club events, they will never come back.  Volunteer to be an Elmer/Elmette and introduce them to equipment and skill demos, field days, contests, local community service events (e.g., emergency comms exercises, Meals on Wheels for older hams and their spouses/significant others, POTA/SOTA outings, etc.), repeater installation, maintenance, and upgrade sessions, holiday parties, and so forth.

I would sincerely like to thank the many Elmers and Elmettes here who have (often unknowingly) provided assistance via their highly-informative, extremely useful, and often humorous posts and links.  Special thanks to Gwen Patton (NG3P) for her sage and detailed advice, and the dozens of others who have donated equipment to the school ham clubs I’ve established.

I also want to thank those who have enabled me to buy assembled and unassembled kits within my fun money budget and over time as it gets replenished.  I fund computing, robotics, and telecommunications classroom, lab, and club purchases for extremely rural and reservation schools in the Mountain West out of my own pocket because school districts require use of authorized vendors (board members’ brothers-in-law, et al).  Purchases also have to be identified in the coming years’ budget submissions at least 12 to 18 months in advance.

We now return you to your life, already in progress … 


Jim  KJ7JHE
Lame Deer High School Amateur Radio Club  KJ7JKU


On Fri, Oct 8, 2021 at 6:35 AM jjpurdum via groups.io <jjpurdum=yahoo.com@groups.io> wrote:
David:

Well said. I was a teacher for over 40 years and there are many times when I asked myself how could anyone who can still fog a mirror ask such a stupid question. Then, I remember my Elmer, Chuck Ziegler (W8FTQ, SK), and the endless questions he endured from a 10 year old PITA. His answers were always polite, informative, and never condescending.

I realize that today, I'm still a PITA. Al Peter (AC8GY), my co-author and new Elmer, has to endure endless hardware questions that I'm sure test his patience. Still, he doesn't give up on me and I've learned a bunch from him.

As some of you know, I'm a software guy, but always wanted to be a EE. Just before the 9th grade, you and your parents had a "Path Conference" with a counselor to decide a vocational or pre-college path. I told him I wanted to be a EE and he looked at my parents and said: "Jack's not smart enough to go to college. He should stay here and fix farm equipment." That one sentence haunted me from that day on. Always remember that words are forever and even a casual, off-hand, remark can have lasting, and sometimes, devastating, effect on a person. Try to extend the patience and kindness you were likely shown years ago when you were someone's PITA.

Jack, W8TEE

On Friday, October 8, 2021, 02:49:31 AM EDT, David Wilcox K8WPE via groups.io <djwilcox01=yahoo.com@groups.io> wrote:


Guys,

I have been a ham since 1960 and could easily make something like this but there are many hams out there who do not have my experience or Allison’s.  Please be more gentle and maybe refer the newbies to an article about said tuner, tuners, and tuning an antenna.  Right now I am Elmering an 82 year old retired pediatric dentist (general class) who is driving me nutz with his questions but I am having a ball helping him and seeing his eyes light up.  He always apologizes for his questions and they always come at a time when I am busy with something else, but I do stop and try to answer him and then look something more up and get back to him.  Please be gentle with answers.  Too many prospective hams and newly licensed hams are driven back in their hole never to be heard from or seen again.

As simple as Hans rigs are they always seem to generate questions that are probably answered in the manual but even I (at 76) sometimes don’t “see” it even on the third time reading through it.  

Thanks for all the gentle answers I have read in this site, sometimes from Hans himself.  I know there are those who don’t like splitting a site but maybe we need one for the “experts”, one for the “pseudo” experts, and one for the newbies.  I would follow all of them.

As for antennas there is a lot to learn on the QRP Guys site, both kits , simple tuners, and how to use them:  https://qrpguys.com/antennas.  For the more advanced and interested newbies this site is very good:  https://www.dj0ip.de/antennas/  And yes, don't forget the Four State QRP guys site: http://www.4sqrp.com/4stuner.php. They also have many other simple kits for the newbie.  I have built most of them and they are easy and work.  Dave Cripe’s QRPOmeter is a great learning tool at http://www.4sqrp.com/QRPometer.php. It is “retired” but he sells them on eBay:  https://www.ebay.com/itm/QRPoMeter-Digital-15W-QRP-Wattmeter-Dummy-Load-VSWR-Meter-Kit-/255043537914?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0  It’s one of the best QRP dummy load and power meters I have used and I have many tools for that.

Dave K8WPE since 1960 and still learning, and “re learning” things I forgot years ago.  Sorry for being so verbose but I thought some kindness and information could be dispensed here.  Yes, adding this stuff to a nice QRP kit would be great but only adds complexity. Building separate modules can take some of the hair pulling out of this suggestion and teach another aspect of this wonderful hobby.  

David J. Wilcox’s iPad

On Oct 7, 2021, at 4:57 PM, ajparent1/KB1GMX <kb1gmx@...> wrote:

Reg,

Indeed.

I scratch build my own designs, I have no excuse as a retired engineer.  Kits
are handy for saving me time rounding up parts.  But to be blunt a tuning unit
is for me a 10 minute junk box sourced project. 

If the antenna is built right then ATU is not needed.    I have one in my portable kit
and I do check it from time to time, it just works and more stuff is a complication
that is not needed.

As to a simple indicator of power out trivial thing and handy as well.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due to address harvesting


@Hans - Curious about the QDX PA drain waveform

Johan Bodin
 

Hi Hans

Congratulations to the QDX success!

The PA looks like a "current switching class D" amplifier. I am curious about the drain waveform on the BS170s. It would be interesting to see how the leakage inductance of output transformer T1 plays with the transistor, and stray, capacitances. Do you have an o'scope picture of that?

73 Johan SM6LKM


Re: Signal Synthesizer from QDX Question for Hans

Hans Summers
 

Hi Antii

There are many such suppliers listing stock of various things. When you try and buy it, or inquire about it, there is NO STOCK or if there is, the price is 5x what is listed. There's an awful lot of junk all over the internet. Anyway I made an inquiry to these utsource guys and received reply "sorry, we have no stock.". Hi hi. But at least now they have my contact details so they can bother me three times per week asking me if I need any parts and they can help me find them :-//   Welcome to 2021... 

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


On Tue, Oct 12, 2021 at 11:12 AM Antti Vähälummukka <vahisa@...> wrote:
Hi Hans,

I guess you already know this but utsource seems to have thousands of the STM32F401RBT6 chips available.

Antti OH5KB


ti 12. lokak. 2021 klo 1.54 Hans Summers (hans.summers@...) kirjoitti:
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

 



--
ana


Re: Signal Synthesizer from QDX Question for Hans

Antti Vähälummukka
 

Hi Hans,

I guess you already know this but utsource seems to have thousands of the STM32F401RBT6 chips available.

Antti OH5KB


ti 12. lokak. 2021 klo 1.54 Hans Summers (hans.summers@...) kirjoitti:

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

 



--
ana


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

Carl Clarke (2E0LUA)
 

Err, yeah why not? Isn't the topic 'QDX first batch ordering'? People are happy to have a new device to experiment with and use. Me too :) Well done QRP Labs!


Re: Chinese copies of uSDR/X

JE Jesson
 

Wayne Green was always interesting and I keep all my 73 magazines as they STILL have great homebrew articles in addition to Wayne's NSD editorials.

73, Joe W2JEJ


On Mon, Oct 11, 2021 at 1:39 PM jjpurdum via groups.io <jjpurdum=yahoo.com@groups.io> wrote:
In the US, about 25% of employed people are employed by the gov't. Add on top of that those people who live on gov't transfer payments: rent/food subsidies, welfare, etc., and you probably have 40% of the population beholding to the gov't. While not all of those vote for a single party, most will vote for policies that keep the gov't "big". People forget the gov't produces nothing. It can only redirect resources by taking them from one (productive) group and giving those resources to another (often less productive) group. That is, the gov't "gives" you nothing...other people do.

Jack, W8TEE

On Monday, October 11, 2021, 01:31:25 PM EDT, Dave VE3GSO <ve3gso@...> wrote:


If the sensible people stop voting for people and parties that will make positive change, then the crazies have won by default.  And there is a lot of crazy out there!

As Wayne Green used to say "Never Say Die".  If you don't know who Wayne Green was, do your research.

Dave

On Mon, Oct 11, 2021 at 1:21 PM Albert Tatlock's Greatest Hits - Vol 1 via groups.io <andyfoad=rocketmail.com@groups.io> wrote:
On Mon, Oct 11, 2021 at 04:43 PM, Hans Summers wrote:
In 2021 it is more difficult than ever to run a small business. It is becoming more and more impossible. It doesn't matter what nonsense the politicians tell you, about how they want to encourage entrepreneurs, innovation, small business... they're all lying. The reality is that in every country I've ever done business, EVERYTHING is stacked in favour of big business, multinationals... the small guy is of no relevance to anyone. 
I've given up voting.
It's all BS and nothing ever changes.


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

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