Date   

Re: Qcx keyer erratic

 

So let's get down to elemental diagnostics...
Is the QCX 20 new? i.e. Has it ever worked?
Does it only add dits AFTER another dit? Dahs after other dahs? Or seemingly random?
Have you changed anything in the environment?
Might there be wire whiskers in the 3.5mm plug?
Any routing issues with the key cable? Strong magnetic fields? (The circuit relies on internal pull-ups in the processor, so it isn't "brick s-house" immune to induced noise).

--
Julian, N4JO.


Re: L4 Temp QCX 20 Meter Rev 1 upgraded PCB.

William Jenrick
 

If it ain't broke, then don't fix it.....More to worry about in life.....

On Mon, Feb 22, 2021 at 6:30 PM Brian N7BKV <cl@...> wrote:
I was doing some more temperature readings on the QCX Rev1 board.  The hottest spot was the L4 inductor after 30 second Morse string.  This is in the circuit between the key shaping circuit and the BS170 .  MOSFETS.  Measured temp was 100 F (about 38 C).  That's not destructively hot.  But relative to all the other components on the board it is not alarming hot.  But the question I have for those that know the circuit better than me, does this relative temp reading seem OK, or does it indicate a possible fault in a solder connection or other components in the circuit?

Thanks for any observations on this.

Brian N
N7BKV



--
William Jenrick 


Re: QCX+ Audio Eventually Fades Away

n7dv@...
 

Roelof,

C22 was the issue.  I swapped it out, turned the rig on and have had a solid 6.48V on pins 1, 2, 3, 5, 6, & 7 for well over two hours now.  Solid reception.  I have really enjoyed building this kit.  I've even enjoyed the troubleshooting.  It helped me get much more familiar with the radio, which is really what I wanted to get out of building it.

Thank you so much for the spot on advice and the quick response!

73,
Dave N7DV


Re: tuners for experimental antennas and the QCX

Phil/K3UT
 

The T1 will tune bedsprings. --
Philip L. Graitcer
St Simons Island, Georgia
404-245-9780

Times are bad. Children no longer obey their parents, and everyone is writing a book. 

      -Marcus Tullius Cicero, statesman, orator and writer (106-43 BC)




Re: QCX Challenge Feb 2021

Phil/K3UT
 

I saw on the EU stations on the sked page. Could hear any of youse guys. And there were few K and W stations stalking 40 this morning and afternoon. Still, it was fun to connect to a few. 

See you next month!

Phil, K3UT 
40M mini. OCF dipole up 10M. 
--
Philip L. Graitcer
St Simons Island, Georgia
404-245-9780

Times are bad. Children no longer obey their parents, and everyone is writing a book. 

      -Marcus Tullius Cicero, statesman, orator and writer (106-43 BC)




L4 Temp QCX 20 Meter Rev 1 upgraded PCB.

Brian N7BKV
 

I was doing some more temperature readings on the QCX Rev1 board.  The hottest spot was the L4 inductor after 30 second Morse string.  This is in the circuit between the key shaping circuit and the BS170 .  MOSFETS.  Measured temp was 100 F (about 38 C).  That's not destructively hot.  But relative to all the other components on the board it is not alarming hot.  But the question I have for those that know the circuit better than me, does this relative temp reading seem OK, or does it indicate a possible fault in a solder connection or other components in the circuit?

Thanks for any observations on this.

Brian N
N7BKV


Re: tuners for experimental antennas and the QCX

Brian Moore
 

I started out using a QRP-Guys Multi-Z Tuner. It works well on 20/40/17, but cannot match 80m. I sold my QCX-80 in frustration, since I don't have the space for a full-sized 80m antenna and couldn't tune a smaller antenna.

Last year, my Christmas present to myself was an Elecraft T1 Kit. It took two days to carefully assemble, if you've built a QCX, you can build a T1. The build was fun, the only part I found difficult was soldering the relay pins. They are very small and very close to gather. Use a magnifier and double check your work. The T1 worked on first power on and can match anything I have thrown at it so far on all the bands. I love this tuner.

At $159.95, it's not cheap, but imho. it's worth it. Especially if you have several QCXs on different bands or want to use a wide range of antennas. It's also very nice, having a complete station that I assembled myself end-to-end.

73,

Brian - KM6ZX


Re: tuners for experimental antennas and the QCX

@CurtisM
 

I have a zm2 and it works nicely. If it can't match something well add more wire. I do have automakers in my major rigs, but why not a simpler tuner for qrp. 4state qrp may also have a manual tuner. If you might use balanced line that is a consideration. 

Curt wb8yyy


Re: QCX Challenge Feb 2021

Peter GM0EUL
 

Hi All
The 1900 session was marginally better.  I was doubling up on QCX challenge and CWops "giving back" so using more power.  QCX40 with a Juma PA100-D amplifier running 45 watts to an end fed half wave (actually a full wave on 40, its cut as an efhw on 80m).  Managed two qsos with Peter F5OKB and Guliano IZ3PZI.  Peter was definitely not running a qcx, and I don't think Guiliano was either though the qsb was terrible and I wasn't getting everything by any means.

I used the sked page and its great.  

73

Peter GM0EUL

CWops 1899. FISTS 18888, SKCC 16307T, GQRP 15056



On Mon, 22 Feb 2021 at 22:22, Chris Wood via groups.io <g4cws=yahoo.co.uk@groups.io> wrote:
Only 30 minutes available for the 1300Z session on 20m - no response to CQs, but had a 'speed date' 599 with EM25VER in Ukraine and just managed to pull a slightly longer QSO out of the noise with NY2PO, Pat in New York. 
Barefoot QCX-mini 4w into 43m doublet at 8 m agl.  Happy with that even if not QCXs.

Chris  G4CWS


Re: QCX+ Audio Eventually Fades Away

William Jenrick
 

No worries. @ 75 I am rarely offended nor execute my 2nd Amendments rights  on anyone anymore...As I said: I am not trying to bad mouth Hans' kits, only his choice of components to keep his kits @ a "GREAT PRICE RANGE". "You get what you pay for''. But, I would be happy to pay more for better components and a double sided pcb that makes it easy to replace components at will versus how small the kit is and if you can fit it into your lunch bucket
Being in the electronic industry as a field service engineer at a high tech company for over 40 yrs, I know good components from bad. And yes you are right. If it works for a week it will probably work forever. Problem is, when I was hired as an electronic tech back in 1966 we used to troubleshoot to the component level. Which works well for Ham radio operators and my customers at the time, who would not blink an eye for paying for a blown component over having to replace an entire 28 layer pcb ($$$$$) full of micro surface soldered chips,which is what I had to deal with when I retired. Just because a diode took a s..t!!!!
Since I retired, I wanted to get back to Ham Radio for something to do other than sitting on the front porch waiting to die from covid. I let my General License expire without renewing it some 60 yrs ago, but I still have my gold plated Vibroplex Bug and just bought a imboiniac key (didn't have those in my day) and kind of boot leg a friend of mine call sign until I can retake the test. Good luck with that. No testing sites within 150 miles due to covid.
Good luck to you and respectfully yours, w

On Mon, Feb 22, 2021 at 1:53 PM howard winwood G4GPF <winwoodh@...> wrote:
Before you bad mouth anyone please make sure you have ALL the facts, not just your assumptions.
As has been said on this group before, a resistor of the wrong value can do a lot of damage, as can a minute solder bridge, that would need a powerful magnifier and good eyesight to spot.
IC’s are generally very reliable, made in their millions, I have yet to find a faulty one in 50 years of electronic construction. In my experience it is the constructor that killed the IC.
To answer your question, Yes! the resistor colour code HAS changed, there is an extra band on all  modern resistors and you CAN NOT use the old 3 band colour code scheme to identify modern resistors.
Perhaps THAT is why you have had problems?
The first option most people take, is that if ones project does not work, then it must be faulty components.
There are instances of counterfeit components for sale from China but it would not be financially worth it to counterfeit already cheap components.

I would suggest looking nearer to home

Sorry to be so brutal, but someone had to say it.

On 22 Feb 2021, at 21:23, William Jenrick <wjenrick1@...> wrote:

I don't want to bad mouth Hans's kits. They are fantastic for what you pay for. Manuals, instruction, what it will do (if you are lucky) etc are par none. BUT, I am not too hot on the quality of some of the components. I am waiting for a locally sourced Si chip which blew out after 2 weeks of operation. I bought 5 of them (.89 $ each). I only hope that I am able to surface mount it over starting over building a new kit from scratch.
I was amazed that after I built my QCX/40 mtr transceiver that it worked right off the bat, only having to remove a few turns from the "Troid from Hell" to tune it up. 
will
PS Has the resistor color code changed in the last 60 years since I first got started in electronics/ham radio and did not renew my general class license?   I had to use a ohm meter to double check everyone!!!!



On Mon, Feb 22, 2021 at 12:57 PM Roelof Bakker <roelof@...> wrote:
Hello Dave,

I had a similar issue with my QCX+ for 80 m.

To take a long story short, the fault appeared to be C22, which suffered from a minor leakage.
Over time this pulled the input of IC10 low, first causing distorted audio and then shutting off completely.

73,
Roelof, pa0rdt 




--
William Jenrick 
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--
William Jenrick 


Re: QCX Challenge Feb 2021

Chris Wood
 

Only 30 minutes available for the 1300Z session on 20m - no response to CQs, but had a 'speed date' 599 with EM25VER in Ukraine and just managed to pull a slightly longer QSO out of the noise with NY2PO, Pat in New York. 
Barefoot QCX-mini 4w into 43m doublet at 8 m agl.  Happy with that even if not QCXs.

Chris  G4CWS


Re: QCX+ Audio Eventually Fades Away

howard winwood G4GPF
 

Before you bad mouth anyone please make sure you have ALL the facts, not just your assumptions.
As has been said on this group before, a resistor of the wrong value can do a lot of damage, as can a minute solder bridge, that would need a powerful magnifier and good eyesight to spot.
IC’s are generally very reliable, made in their millions, I have yet to find a faulty one in 50 years of electronic construction. In my experience it is the constructor that killed the IC.
To answer your question, Yes! the resistor colour code HAS changed, there is an extra band on all  modern resistors and you CAN NOT use the old 3 band colour code scheme to identify modern resistors.
Perhaps THAT is why you have had problems?
The first option most people take, is that if ones project does not work, then it must be faulty components.
There are instances of counterfeit components for sale from China but it would not be financially worth it to counterfeit already cheap components.

I would suggest looking nearer to home

Sorry to be so brutal, but someone had to say it.

On 22 Feb 2021, at 21:23, William Jenrick <wjenrick1@...> wrote:

I don't want to bad mouth Hans's kits. They are fantastic for what you pay for. Manuals, instruction, what it will do (if you are lucky) etc are par none. BUT, I am not too hot on the quality of some of the components. I am waiting for a locally sourced Si chip which blew out after 2 weeks of operation. I bought 5 of them (.89 $ each). I only hope that I am able to surface mount it over starting over building a new kit from scratch.
I was amazed that after I built my QCX/40 mtr transceiver that it worked right off the bat, only having to remove a few turns from the "Troid from Hell" to tune it up. 
will
PS Has the resistor color code changed in the last 60 years since I first got started in electronics/ham radio and did not renew my general class license?   I had to use a ohm meter to double check everyone!!!!



On Mon, Feb 22, 2021 at 12:57 PM Roelof Bakker <roelof@...> wrote:
Hello Dave,

I had a similar issue with my QCX+ for 80 m.

To take a long story short, the fault appeared to be C22, which suffered from a minor leakage.
Over time this pulled the input of IC10 low, first causing distorted audio and then shutting off completely.

73,
Roelof, pa0rdt 




--
William Jenrick 
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_._,_._,_


Re: QCX+ Audio Eventually Fades Away

William Jenrick
 

I don't want to bad mouth Hans's kits. They are fantastic for what you pay for. Manuals, instruction, what it will do (if you are lucky) etc are par none. BUT, I am not too hot on the quality of some of the components. I am waiting for a locally sourced Si chip which blew out after 2 weeks of operation. I bought 5 of them (.89 $ each). I only hope that I am able to surface mount it over starting over building a new kit from scratch.
I was amazed that after I built my QCX/40 mtr transceiver that it worked right off the bat, only having to remove a few turns from the "Troid from Hell" to tune it up. 
will
PS Has the resistor color code changed in the last 60 years since I first got started in electronics/ham radio and did not renew my general class license?   I had to use a ohm meter to double check everyone!!!!



On Mon, Feb 22, 2021 at 12:57 PM Roelof Bakker <roelof@...> wrote:
Hello Dave,

I had a similar issue with my QCX+ for 80 m.

To take a long story short, the fault appeared to be C22, which suffered from a minor leakage.
Over time this pulled the input of IC10 low, first causing distorted audio and then shutting off completely.

73,
Roelof, pa0rdt 



--
William Jenrick 


Re: Abnormal voltage on 74ACT #troubleshooting

Jean-Paul
 

Hello,

I changed the 3 BS170 of PA + Q4 + Q6 and it's transmitting again.

But I still have that wird signal on pin 9... strange!

Jean-Paul


Re: QCX+ Audio Eventually Fades Away

Roelof Bakker
 

Hello Dave,

I had a similar issue with my QCX+ for 80 m.

To take a long story short, the fault appeared to be C22, which suffered from a minor leakage.
Over time this pulled the input of IC10 low, first causing distorted audio and then shutting off completely.

73,
Roelof, pa0rdt 


Re: tuners for experimental antennas and the QCX

namerati@...
 

On Mon, Feb 22, 2021 at 12:26:04PM -0700, Fred Spinner wrote:
Anecdotal, but the LDG AT-11 I built years ago matched better than the
built in tuner in a TS-440SAT did.
The LDG AT-11 is an interesting case, and after looking up the performance numbers for the design I am starting to wonder if I got something fundamentally wrong.

The LDG AT-11 was apparently measured as "only" being able to match a range of 10-500 ohms:
(see last page)
https://ldgelectronics.com/wp-content/uploads/2018/12/at-11article.pdf

Now, the AT-11 is an 8x8 L-network (vs 7x7 or 5x5 for the ATU-100) and is quoted as having L/C ranges of 0-20µH and 0-1280pF.

The T1 (which I had heard would match 40-4000 ohms) has L/C ranges of 0-7.5µH and 0-1300pF.

The ATU-100 (7x7 version) is specified for inductance/capacitance ranges of 0-8.5µH and 10-1870pF.

Can someone explain to me how the AT-11 could have a *much* larger inductance range, but still be able to tune an order of magnitude smaller range of impedances?

Or did I hear wrong about the T1's tunable inductance range being 40-4000 ohms, and is it closer to the 10-500 range of the AT-11?

N7DDC has posted smith charts of the ATU100 (7x7) but I have not yet worked out how to translate them into a usable impedance range value:
https://groups.io/g/ATU100/topic/computer_simulation_model_for/80572292

Can anyone here provide some insight?

As for balanced tuners having a narrow matching range, that is at least
true for my vintage Johnson Matchbox... But they are known to be lower loss
as well... Different tools for different jobs...
Do you know how much lower loss? I have seen insertion loss results for the ZM-2/ZM-4 somewhere, but not yet any tests for L-networks.


Re: tuners for experimental antennas and the QCX

Karl Schwab
 

I have only 1 antenna tuner at KO8S and it is a Dentron MT-3000a manual tuner that I have had here for years!  I use it for all my radios, QRP and QRO up to the legal limit tuning all my HF antennas; center fed Zepp and Yagi's.  Using this tuner, I have never damaged any of my radios!  Some of my newer radios have a built in auto tuner and I never use them.  I tried stand alone auto tuners, and I am a bit leery of them, i.e., might damage a radio that does not have PA protection. I have been at this hobby for many years, and I am sticking with what works for me and I am just passing my experience along.  Karl


Re: QCX Challenge Feb 2021

ON7DQ Luc
 

My 19:00Z session
Only QRV on 40m.
Good to see several people using the sked page, very easy to find their frequency.
But  alas, I couldn't hear any of the others (and no other QCX called me). 
I worked 5 stations that I saw on the bandmap (https://dxcluster.ha8tks.hu/rbn_ct1boh/), but none were QCX. More luck next time.

Rig: same setup as in the 13:00 session, power 50W

Luc ON7DQ


Talk: “Cherokee Challenge Flight – London to Sydney the slow way – by Andy Hardy G1AJH (ex VK2CHA)”

Trystan G0KAY
 

Tuesday 23rd 8 pm (2000 UTC) 

“Cherokee Challenge Flight – London to Sydney the slow way – by Andy Hardy G1AJH (ex VK2CHA)”

Join us on this amazing adventure of a lifetime. Two chaps, a light aircraft and an HF radio piloting their way from Blighty to Oz, the slow way! Andy Hardy G1AJH (ex VK2CHA). So make sure your seats and tray tables are in the upright position, make sure your seat belt is securely fastened and that your carry-on luggage is stowed in the overhead lockers. Get ready for takeoff! Chocks away. 

This event is hosted on Zoom: https://zoom.us/j/7730730073 (Meeting ID: 773 073 0073 )

Also Live-streaming on YouTube with live chat: https://tinyurl.com/buryradio 

(Bury Radio Society, with Warrington ARC)


Re: Qcx keyer erratic

Hans Summers
 

Hi Jim

I use my QCXs at 15wpm and they always work perfectly. I'm using the latest firmware 1.07a.

I had 9 QSOs today on 20m in the 1300Z session of the QCX QSO party and a few minutes after the hour ended. Since I've had almost no QSOs in the last 3 months (just two I think), I reduced the speed to 14wpm after the first QSO to give myself a chance to get in practice again, gently. 

I do wonder if you have problems with RF getting into your paddle cable. Coax common mode currents and grounding issues can wreak havoc. 

73 Hans G0UPL 


On Mon, Feb 22, 2021, 23:12 Jim Painter via groups.io <Jfpainter=yahoo.com@groups.io> wrote:
Trying to do QCX challenge on 20m. My keyer was so screwed up I couldn’t answer anyone. Decided to do a reset on the QCX. Started working fine. Reset had set speed back to 12wpm. When I crank up to 15 wpm starts giving extra dit and dahs. Sometimes misses dits and dahs. I have no problem with 15wpm on my other rigs. Guess I’ll just leave it at 12wpm.

Hans, do you have any ideas. My fist is not great but I’ve always been able to handle 15wpm.

73...Jim....KQ3S



On Feb 22, 2021, at 10:30 AM, Daniel Walter via groups.io <nm3a=yahoo.com@groups.io> wrote:

Auto Space off? Typo?
--
73, Dan  NM3A

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