Date   

Re: Sudden failure in early life

Steve in Okinawa
 

Good to know I wouldn't be the first lucky one!

73 JS6TMW

On 3/17/2018 2:47 AM, V Zecchinelli wrote:
I had a similar issue with no data on the LCD.  Replacing the ATMega
solved the problem.

73 de N1VIN (Vince)


On 3/16/2018 8:30 AM, Steve in Okinawa wrote:
I've removed the input toroid completely. I think I had two wires
reversed, so that would explain some part of the problem. And I have the
correct voltage at the R1-R2 divider, so I probably had grounded it.

BUT - still no data on the LCD. I checked all the connections. Contrast
voltage range is correct. The 20 MHz oscillator is going strong. Is it
just possible that the microprocessor gave up the ghost while I was
having lunch????

JS6TMW


On 3/16/2018 7:59 PM, Alan G4ZFQ wrote:
   I was also trying to figure out why I saw zero voltage at the
junction of R1 and R2, as related to not being able to peak the BPF.
Steve,

The RX will not work unless this is correct.

By the way, is the hole numbering on the schematic on p.52 correct?
No-one has commented about this before.

there was nothing on
the LCD. The contrast adjusts but no data from the microprocessor.
Most
discouraging. I have the usual test instruments but no idea where to
start looking for the problem.
A start for troubleshooting http://qrp-labs.com/qcx/qcxtrouble.html

73 Alan G4ZFQ






Re: Sudden failure in early life

Steve in Okinawa
 

Glen,

I must have written the numbers down wrong. Checked it again and IC9 pin 3 is 4.5 volts, still wrong but it's not a regulator problem (regulator is putting out 5.1v)


On 3/17/2018 3:42 AM, Glen Leinweber wrote:
Steve,
Among a few other suspicious voltages:
IC9 pin 3: 5.9V !!
This looks bad. Your 5v regulator IC11 should be putting out 5V, not 5.9V
These regulators can only supply voltage, and cannot deal with
something that tries to pull them higher.
Perhaps a current path somewhere between +12v and the 5V rail?
Re-check that the regulator is actually providing +5v at its output.


Re: GPS Kit Question #qlg

Michael Baker
 

Yellow LED is on all the time. No blinking. I'll attempt to attach a 5V source directly to the board and see what happens.


On Wed, Mar 14, 2018, 12:02 Bill Oelker <boelker@...> wrote:
Hook the 4 pin connector + -  to a good 5VDC supply and see if it locks up. Observe the polarity. Don't hook it to the QCX till you get past this test. It may take a few minutes to find itself but this way you can't hurt it. Or interfere with it. You didn't mention if the red power led lights, or the yellow led blinks. Make sure Leds are oriented correctly. Scope the leads if you have one. Is the battery oriented correctly. The satellite data doen't display correctly on the QCX , thats a known bug. Bill KN8DMK


Re: A word about QRP Labs capacitors and toroids

Chris Wilson
 

Hello Andrew,


137 kHz is damn near VHF these days ;)

2018-01-05 W4DEX to DL0A0 on 8269.9 Hz Distance 7257.9 Kms
A new world record distance for message decoding in the 36km band.

A recent successful transmission below 9kHz went from East to West
trans Atlantic, too.

On Friday, March 16, 2018 you said,

Just relocked at this I consider 2200 M almost AF!!! However my VNA does go now to 10 KHZ
BR Andrew
--

2E0ILY
Best regards,
Chris mailto:chris@chriswilson.tv
--
Best regards, Chris Wilson (2E0ILY)


Ultimate 3S and separete receiver #chat

Stuart Cameron Vk5ade
 

A new chat has been created:

Hi All, i was wondering how you set up a U3S and a receiver and a single antenna as portable station.
I am wanting to put a WSPR beacon at my second property which is many hundreds of kilometers from here.
Is this possibly 
73
Stuart VK5ade 

  

View/Join This Chat


Re: QRSS Grabbers

Andy G0FTD <punkbiscuit@...>
 

Nice little website Paul.

Always nice to read stuff from a real enthusiast, keep up the good work.


73 de Andy
https://sites.google.com/site/g0ftdradio/home


Re: Possible problem

Denis F6GKQ
 

Hi John,

That's fine if you can make a side by side comparison between your two kits. I hope you'll find the problem doing so.
Good luck, and, please, give us the solution when found.

--
73 from Denis, F6GKQ
QCX 40m nr 3082


Re: Possible problem

lajes67
 

Hi Denis,

     Yes I made sure that the volume was at mid range setting but it makes no difference, I mentioned that step 8.7 has C-1 in the mid range setting, it's everything after that I cannot adjust, I had to replace R27, same value, 500 ohms, the other two are 50k ohm variables.

     I'll be doing a lot of "stare and compare" with the first kit I built.

Thanks and 73 John K2IZ


Re: Possible problem

lajes67
 

Hi Wes,

     Thanks for the reply, as I mentioned this isn't my first rodeo, I use kit 434 as a reference, and now I'll be doing a "stare and compare" with 2556.

     Yes I made sure to wind T-1 in the same direction for the primary and the secondary's, being left handed made it a bit of a chore, before and after installing T-1 I made sure to meter out the leads, DVM, after soldering I rechecked again and I have continuity at the solder pads, same thing goes for L-1 through 4, all wound the same way and I have continuity on each one at the solder pads.

     I mentioned that I had installed R27 the wrong way, I installed a new one, same value, yes it is a multi-turn 500 ohm resistor, R17 and 24 are the 50k ohm multi turn resistors, with the vol. pot R36 in full CCW position I get a reading of 8, turn it full CW and I get a reading of 13, put R36 in the mid range position and I get 9, I ran the pot through the entire range of 100-500 ohms and it makes no difference, and the same goes for the next two steps. 

     The adjustment for step 8.7 is right on, the C1 trimmer cap has the variable plates in the middle of the stator plates, like the picture shows.

     Right now all the controls are attached to the board with short pieces of wire, I will be putting this into a case when I get everything finished, that also goes for the antenna, I have a short piece of RG-174 soldered to the board and the other end is not connected.

     I'll be spending this evening looking over a lot of things, comparing the new with the old and see if something jumps out at me, as I mentioned, I'm not that familiar with an O scope, I spent 41 years in telco doing data, TTY and computers, but I'm willing at age 70 to break open a book or two.

73 John K2IZ


Re: QRSS Grabbers

N1BUG
 

The N1BUG LF/MF grabber has not been active for some time. I am not
aware of anyone currently transmitting QRSS or DFCW on those bands
(except K2ORS who I can hear with my ears), plus my high duty cycle
WSPR-2 and WSPR-15 transmitting on LF would make a huge mess of it.
When it is active it can be viewed here:

http://www.n1bug.com/station/grabber/

My U3S is doing great on 2200m WSPR-2 / WSPR-15 !

73,
Paul N1BUG

On 03/16/2018 02:58 PM, Andy G0FTD via Groups.Io wrote:
Are there KP3FT and N1BUG grabbers active ?

Just had a look on QSL.NET but found nothing.


Re: QRSS Grabbers

Andy G0FTD <punkbiscuit@...>
 

On Fri, Mar 16, 2018 at 12:01 pm, KP3FT wrote:
I'm not running a Grabber, but I do often upload screenshots to qsl.net.  N2NXZ is sending Grabber spots to qsl.net, and Eddie's info fixed the upload problem for him.
OK thanks for the clarification.

73 de Andy


Re: QRSS Grabbers

KP3FT
 

I'm not running a Grabber, but I do often upload screenshots to qsl.net.  N2NXZ is sending Grabber spots to qsl.net, and Eddie's info fixed the upload problem for him.


From: Andy G0FTD via Groups.Io <punkbiscuit@...>
To: QRPLabs@groups.io
Sent: Friday, March 16, 2018 2:58 PM
Subject: Re: [QRPLabs] QRSS Grabbers

Are there KP3FT and N1BUG grabbers active ?

Just had a look on QSL.NET but found nothing.

73 de Andy



Re: QRSS Grabbers

Andy G0FTD <punkbiscuit@...>
 

Are there KP3FT and N1BUG grabbers active ?

Just had a look on QSL.NET but found nothing.

73 de Andy


Re: QRSS Grabbers

KP3FT
 

Hi Paul,

Yes, you're right, I just checked mine .  Sorry, was confused. 

Eddie, disregard my question about .jpeg vs .jpg.  73


From: N1BUG <paul@...>
To: QRPLabs@groups.io
Sent: Friday, March 16, 2018 2:31 PM
Subject: Re: [QRPLabs] QRSS Grabbers

The version of Argo I use (build 145) creates and uploads files with
extenstion .jpg

Paul


On 03/16/2018 02:20 PM, npton wrote:
> Huh, I don't use Argo didn't realise that. When the team contact me
> I will mention it.
>
>
> On 16/03/2018 17:55, KP3FT via Groups.Io wrote:
>> I forgot to add, ARGO only saves in .jpeg, .gif. and .bmp file
>> extensions, not .jpg.  Will .jpeg extension still work?






Re: Sudden failure in early life

Glen Leinweber
 

Steve,
Among a few other suspicious voltages:
IC9 pin 3: 5.9V !!
This looks bad. Your 5v regulator IC11 should be putting out 5V, not 5.9V
These regulators can only supply voltage, and cannot deal with
something that tries to pull them higher.
Perhaps a current path somewhere between +12v and the 5V rail?
Re-check that the regulator is actually providing +5v at its output.


Re: QRSS Grabbers

N1BUG
 

The version of Argo I use (build 145) creates and uploads files with
extenstion .jpg

Paul

On 03/16/2018 02:20 PM, npton wrote:
Huh, I don't use Argo didn't realise that. When the team contact me
I will mention it.


On 16/03/2018 17:55, KP3FT via Groups.Io wrote:
I forgot to add, ARGO only saves in .jpeg, .gif. and .bmp file
extensions, not .jpg.  Will .jpeg extension still work?


Re: QRSS Grabbers

KP3FT
 

Thanks for all your efforts.  I and a friend of mine have been relying on qsl.net FTP uploads, and wondered what had happened.  73!

KP3FT


From: npton <g3zjo@...>
To: QRPLabs@groups.io
Sent: Friday, March 16, 2018 2:20 PM
Subject: Re: [QRPLabs] QRSS Grabbers

Huh, I don't use Argo didn't realise that. When the team contact me I will mention it.

On 16/03/2018 17:55, KP3FT via Groups.Io wrote:
I forgot to add, ARGO only saves in .jpeg, .gif. and .bmp file extensions, not .jpg.  Will .jpeg extension still work?



From: npton <g3zjo@...>
To: QRPLabs@groups.io
Sent: Friday, March 16, 2018 12:20 PM
Subject: [QRPLabs] QRSS Grabbers

I am sure some QRPLabbers must have a Grabber on QSL.net.
There have been some changes at QSL.net recently. Your Grabs uploaded are not being updated properly on your Grabber. This is due to the caching of all files on the Server.
The team at QSL.net have come up with a solution. The filenames used must have a special EXCEPTION. This can't be done for individual files so we have agreed a standard set which should prove adequate for all users. All you need to do is to change your image file name to one of the following in the range :-
vlf1.jpg to vlf9.jpg, lf1.jpg to lf9.jpg, mf1.jpg to mf9.jpg, hf1.jpg to hf9.jpg, vhf1.jpg to vhf9.jpg, uhf1.jpg to uhf9.jpg
Finally be sure to read the box below.
73 Eddie G3ZJO






Re: Sudden failure in early life

Alan G4ZFQ
 

Nothing or two rows of blocks depending on the pot position.
If you read the troubleshooter it gives you instructions on what to do next.
What firmware?

I went down the whole list of voltage checks.
As you are concerned with the micro these are not required at the moment. Although micro voltages might be.

73 Alan G4ZFQ

Lots_ of problems, so
maybe you can figure out where I should be looking. I'll only list the significant voltage discrepancies:
Clk0 and Clk1 test pins - no squarewave, no DC
Top side of C43 0.95v
Top sides of C44, C45, C46 all 1.31v
_IC5 pin 1, pin 2_  1.31v, _pin3_  0.86v, _pin5 _0.87v, _pins 6,7_  1.32v
_IC6 pins 1,2,3,5,6,7_ all 1.37v
_IC7 pins 1,2,3,5,6,7_ all 1.37v
_IC8 pins 1,2,3,5,6,7_ all 1.38-1.40v
_IC9 pin 3_  5.9v, _pin 5_  1.38v, _pins 6,7_  1.41v
_IC10 pins 5,6_  5.9v
_LCD pin4 1.21v_, _pins 7,8,9,10,11_  5v_,_ _pins 12, __13_ 0v.
I hope this provides plenty of clues.
73,
Steve
On 3/17/2018 12:06 AM, Alan G4ZFQ wrote:
correct voltage at the R1-R2 divider, so I probably had grounded it.

Steve,

Yes, maybe, just keep an eye on it as you progress.
I checked all the connections. Contrast
voltage range is correct. The 20 MHz oscillator is going strong. Is it
just possible that the microprocessor gave up the ghost while I was
http://qrp-labs.com/qcx/qcxtrouble.html

Probably unlikely, bit just about possible. More likely joints, shorts.
Do all the checks in the LCD section show no errors?

73 Alan G4ZFQ


Re: QRSS Grabbers

npton
 

Huh, I don't use Argo didn't realise that. When the team contact me I will mention it.


On 16/03/2018 17:55, KP3FT via Groups.Io wrote:
I forgot to add, ARGO only saves in .jpeg, .gif. and .bmp file extensions, not .jpg.  Will .jpeg extension still work?



From: npton <g3zjo@...>
To: QRPLabs@groups.io
Sent: Friday, March 16, 2018 12:20 PM
Subject: [QRPLabs] QRSS Grabbers

I am sure some QRPLabbers must have a Grabber on QSL.net.
There have been some changes at QSL.net recently. Your Grabs uploaded are not being updated properly on your Grabber. This is due to the caching of all files on the Server.
The team at QSL.net have come up with a solution. The filenames used must have a special EXCEPTION. This can't be done for individual files so we have agreed a standard set which should prove adequate for all users. All you need to do is to change your image file name to one of the following in the range :-
vlf1.jpg to vlf9.jpg, lf1.jpg to lf9.jpg, mf1.jpg to mf9.jpg, hf1.jpg to hf9.jpg, vhf1.jpg to vhf9.jpg, uhf1.jpg to uhf9.jpg
Finally be sure to read the box below.
73 Eddie G3ZJO




Re: FT8 for U3?

Don Meyerhoff
 

Would be just a chip change?

73

Don Meyerhoff
WA2SWX

On Dec 6, 2017 8:52 AM, "Hans Summers" <hans.summers@...> wrote:
Hi Dean

I already coded FT8 in my U3, next version v3.13, last week. I have not yet had a chance to test it. v3.13 also contains JT4 and RTTY modes. 

73 Hans G0UPL

On Wed, Dec 6, 2017 at 4:48 PM, Dean Smith <g7eob1@...> wrote:
I think there are two answers to this one, but i'll ask all the same!
Any chance of FT8 mode being included in the U3 firmware.
I know the room in the ATMEGA is tight!  (PI mode anybody still use it???)
I understand this mode is a quick version of JT65 (15 second slots)!
The idea behind this is that it would be possible to fit in another tx mode within a frame.
I'm sure most will have 15 seconds spare, before calibration starts?!
thoughts anybody???
Dean G7EOB