Date   
Re: Resistor Error ?

Alan G4ZFQ
 

I have R18 (4.3k) installed in R41's location and R41 (470ohm) – not yet installed.
Paul

R18 must be 4.3K, IQ balance will be affected by the change in gain.
R41 might work with a 4.3K but it is no doubt specified as 470 for a reason.
Best do it right.

73 Alan G4ZFQ

Resistor Error ?

w2eck
 

Building the QCX and when I got down to installing last two resistors and think I found an error.

I have R18 (4.3k) installed in R41's location and R41 (470ohm) – not yet installed.

So my question, albeit possibly a dumb one, do I need to uninstall R18 and procure another to install or will the QCX work with these two resistors transposed?

73 Paul w2eck

Re: Is wsprnet falling to pieces again ?

Graham, VE3GTC
 

Indeed.  Some times of the day it is relatively quite quick and responsive and at other times very slow or times out.

Day time seems to be better than mid to late evening (local North America Eastern Time) - perhaps similar in other areas?

Sometimes it seems if try to connect or refresh a connection at an odd minute  i.e. 01, 03, 05, 07, 09, 11 ... etc the connection seems to be better than when done much closer to even minute. We know that WSJT-x and other programs do their upload after the last WSPR frame which ends just before the even minute.  Too bad the application does not permit selection of an "off" upload time or better has the inbuilt smarts to upload at some random time based on location or some such thing.  Can you just imagine the network load of 10,000 (more or less) WSJT-X applications trying to upload to the server, what a traffic jam that would be!

Google maps are something else again - Open Source Maps would be a better choice and there was some talk changing but doesn't appear to be any movement.

cheers, Graham ve3gtc

Re: Is wsprnet falling to pieces again ?

Roger Hill
 

I disagree. It is pretty bad here near Leeds most times of the day.
Roger
G3YTN


On 18 September 2019 19:18:59 BST, "geoff M0ORE via Groups.Io" <m0ore@...> wrote:

No problem in England at any time of day, Google map not registered is a distraction but does not stop function.

On 18/09/2019 19:06, Alan wrote:

It works fine in the mornings as do the 3rd party extensions in the UK. I complained about slow operation a short while back, seems something good happened. What do you want for free?

 

73

Alan

G8LCO

 

Sent from Mail for Windows 10

 

From: Andy Brilleaux via Groups.Io
Sent: 18 September 2019 07:02 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] Is wsprnet falling to pieces again ?

 

Really dreadful in the last few months.
Long response times and failed connections.
At one point this would be a xmas holidays event (peak time).
Now is any time.

73 de Andy

 


--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Re: Is wsprnet falling to pieces again ?

geoff M0ORE
 

No problem in England at any time of day, Google map not registered is a distraction but does not stop function.

On 18/09/2019 19:06, Alan wrote:

It works fine in the mornings as do the 3rd party extensions in the UK. I complained about slow operation a short while back, seems something good happened. What do you want for free?

 

73

Alan

G8LCO

 

Sent from Mail for Windows 10

 

From: Andy Brilleaux via Groups.Io
Sent: 18 September 2019 07:02 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] Is wsprnet falling to pieces again ?

 

Really dreadful in the last few months.
Long response times and failed connections.
At one point this would be a xmas holidays event (peak time).
Now is any time.

73 de Andy

 

Re: Is wsprnet falling to pieces again ?

Alan
 

It works fine in the mornings as do the 3rd party extensions in the UK. I complained about slow operation a short while back, seems something good happened. What do you want for free?

 

73

Alan

G8LCO

 

Sent from Mail for Windows 10

 

From: Andy Brilleaux via Groups.Io
Sent: 18 September 2019 07:02 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] Is wsprnet falling to pieces again ?

 

Really dreadful in the last few months.
Long response times and failed connections.
At one point this would be a xmas holidays event (peak time).
Now is any time.

73 de Andy

 

Is wsprnet falling to pieces again ?

Andy Brilleaux <punkbiscuit@...>
 

Really dreadful in the last few months.
Long response times and failed connections.
At one point this would be a xmas holidays event (peak time).
Now is any time.

73 de Andy

Re: AGC

Axel
 

Hi Allison,
Thank you for your advice! I think, this will be very helpful. I'm curious about what the result will be.

73 Axel DF1ET

Re: AGC

ajparent1/KB1GMX
 

The problem with AGC on any radio is keeping TX operations from
pumping up the RX agc since most derieve AGC control voltage
from RX audio.

Two things;
Minimize the side tone level.  As tx sidetone will also drive audio agc.

Insure any rx to tx transfer does nto cause pops or clicks as that
also show up int he audio and will drive most audio agc to become
active (or over active).

Clamp the AGC to some level that represents a no signal receive
during transmit.  That allows the AGC to only work on receive.

If those things are properly done then agc on RX will not harm
the QSK capability.  Didn't say it was easy.

Allison

Re: AGC

Axel
 

My experiences with QSK with AGC now are (speed: 15 wpm): Between words, AGC's decay and receiver's sensitivity is enough to here the received signal. Between letters, I had once the impression to hear a received signal, but would say, generally sensitivity is to low between letters.

I intend to either increase AGC speed or to change the way sidetone is fed into the audio stage.

73
Axel, DF1ET

Re: Si5351A error

geoff M0ORE
 

It's that little gremlin that the solder manufacturers put in the solder to make disappear when you turn away.

On 17/09/2019 22:44, Charles Mims wrote:
Thanks for the help.  One of the leads on D1 had become unsoldered.
Now to get everything else going.

73 Charles KG5ZLH

On Mon, Sep 16, 2019 at 2:44 AM Alan G4ZFQ <alan4alan@...> wrote:
> When restarted i get
> the message Si5351A error.  Have I fried it?  If not how do I get past
> the error message.

Charles,

This means that IC2 is not talking to IC1.
Check the SCL, SDA connections. And the voltage on those lines. Also the
voltage supplied by D1/2. Check Xtal 2 is soldered well.
Look at the Si5351 with a glass, in the past a few have been badly soldered.

73 Alan G4ZFQ



Re: Si5351A error

Charles Mims
 

Thanks for the help.  One of the leads on D1 had become unsoldered.
Now to get everything else going.

73 Charles KG5ZLH


On Mon, Sep 16, 2019 at 2:44 AM Alan G4ZFQ <alan4alan@...> wrote:
> When restarted i get
> the message Si5351A error.  Have I fried it?  If not how do I get past
> the error message.

Charles,

This means that IC2 is not talking to IC1.
Check the SCL, SDA connections. And the voltage on those lines. Also the
voltage supplied by D1/2. Check Xtal 2 is soldered well.
Look at the Si5351 with a glass, in the past a few have been badly soldered.

73 Alan G4ZFQ



Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

f5ihn
 

Hi,

problem solved !

I was confused by the presence of 1 pps of the yellow led, which in turn is the TX data being sent.
The green led of the real 1 pps signal is off, I checked and the RF module doesn't send any signal.
No short-ciircuit, nor any trouble with the 74ACT08 that I removed for testing.

I replaced the board by another one I purchased earlier for the QCX, and all is fine now.

I'll check with Hans if there's a chance to get an RF module for replacement.

73
F5IHN David

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

Alan G4ZFQ
 

I would respectfully suggest some additional or changed
wording in the manual might make this a little clearer.
Chris

Yes, the part you quote "In particular : " this means that the actual reference
oscillator value is 150Hz too high. So enter 27,000,150 in the “Ref.
Frq.” setting."

"the actual reference oscillator value" is somewhat confusing, although the end result is correct.
Perhaps it should say "the actual reference oscillator value is too low"?
Hummm the more I look I begin to think it could be explained better, what if the Ref Frq setting was already 27.004,000 then the new Ref would be..?

Output frequency/Frequency Set*Ref Frq = New Ref Frq

13.500075/13.5000000*27.004000 = 27.004152 in this case 152Hz higher than before.

Maybe when I first tried this I got confused and that's why I work it out once more rather than read the instructions and get confused? My maths is just about good enough for me to calculate these frequencies in proportion:-)

73 Alan G4ZFQ

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

Chris Wilson
 

Hello Alan,

Tuesday, September 17, 2019

Thank you Alan, I believe I see it now, and I am sure you are
correct, but I would respectfully suggest some additional or changed
wording in the manual might make this a little clearer. If *YOU* have
to doubt in some little way if you have it correct us "mere U3S
mortals" may justifiably be left a bit perplexed <LOL>. I may enter
the menus tonight and fix my rather horrible kludge! Thanks again.


Best regards,
Chris 2E0ILY mailto:chris@...


AG> Chris

For example, > suppose you set the output frequency to 13.500000 MHz but you>
AG> actually measure 13.500075. Your output frequency is 75 Hz too high.

AG> So the U3 is thinking the crystal is lower than it actually is. It is
AG> informed by what the stored Reference Frequency tells it.
AG> I guess we all get confused by this, I have to stop and think.
AG> I hope that is correct:-)

AG> 73 Alan G4ZFQ

AG>



--
Best regards, Chris Wilson (2E0ILY)

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

Alan G4ZFQ
 

Chris

For example, > suppose you set the output frequency to 13.500000 MHz but you>
actually measure 13.500075. Your output frequency is 75 Hz too high.

So the U3 is thinking the crystal is lower than it actually is. It is informed by what the stored Reference Frequency tells it.
I guess we all get confused by this, I have to stop and think.
I hope that is correct:-)

73 Alan G4ZFQ

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

Alan G4ZFQ
 

I assume I should see the heart symbol.
David,

Yes, provided that the GPS is locked.
If the QLG1 flashes then the heartbeat should be seen.

73 Alan G4ZFQ

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

f5ihn
 

Hello Alan,

thanks for the quick reply.
Indeed the GPS must be enabled, and it is so. Current time is display and I can get all the GPS data on the stand-by screen display.

I believe also that the GPS would calibrate.
I remember about one thing: as explained page 23 od the Operation manual, a heart beat symbol should be displayed. It is not. That makes me wondering if the U3S really see the GPS ...
I will trace the 1 pps signal til the MCU, this evening.

I will double check "Cal time" and "Cal step" so the calibration can complete, I'm not sure about the value I entered. Anyway I assume I should see the heart symbol.

73
F5IHN David

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

Chris Wilson
 

Hello Alan,

Tuesday, September 17, 2019

OK, call me dumb, I have broad shoulders and a sense of humour :) I
have never really understood this section of the manual:

"Once you have measured the actual output frequency, you can
calculate the required correction to the 27MHz reference frequency
and enter it in the “Ref. Frq.” configuration setting. For example,
suppose you set the output frequency to 13.500000 MHz but you
actually measure 13.500075. Your output frequency is 75 Hz too high.
Since your output frequency setting is 2 times less than the 27MHz
reference oscillator frequency, this means that the actual reference
oscillator value is 150Hz too high. So enter 27,000,150 in the “Ref.
Frq.” setting."

In particular : " this means that the actual reference
oscillator value is 150Hz too high. So enter 27,000,150 in the “Ref.
Frq.” setting."

I have always thought this should read 26,000,850 in the Reference
Frequency setting if it was too high....


Now, make me look an idiot and teach me where I am going wrong
please.

I work solely LF with my GPS locked U3S so just set the TX frequency 2 Hz low
and compensate the tiny error that way. probably because I don't
understand that section of the manual.... ;)


Best regards,
Chris 2E0ILY mailto:chris@...


The actual TX frequency is abt 200 Hz too high.
The assembling manual page 19 says that no calibration is required when
having the GPS, with regards to the 27 MHz "Ref. Frq" parameter.
AG> David,

AG> Page 15 tells you about calibration.
AG> If you have PPS then GPS must be enabled. Then set calibration as
AG> suggested on page 15, make step (default 1) larger to calibrate quickly,
AG> then smaller for final accuracy .

It is said also that the internal freq would be 26.998 rather than
27.004 when having the GPS. Looking in the parameters, 27.004 is shown
instead of 26.998.
AG> ~27.004 is normal for the standard crystal.

I plan to slightly change "Ref. Frq" and look for any change in the
output freq.
AG> Calibration should do this.

AG> 73 Alan G4ZFQ

AG>



--
Best regards, Chris Wilson (2E0ILY)

Re: calibration of U3S + GPS #u3s #qlg1 #si5351a

Alan G4ZFQ
 

The actual TX frequency is abt 200 Hz too high.
The assembling manual page 19 says that no calibration is required when having the GPS, with regards to the 27 MHz "Ref. Frq" parameter.
David,

Page 15 tells you about calibration.
If you have PPS then GPS must be enabled. Then set calibration as suggested on page 15, make step (default 1) larger to calibrate quickly, then smaller for final accuracy .

It is said also that the internal freq would be 26.998 rather than 27.004 when having the GPS. Looking in the parameters, 27.004 is shown instead of 26.998.
~27.004 is normal for the standard crystal.

I plan to slightly change "Ref. Frq" and look for any change in the output freq.
Calibration should do this.

73 Alan G4ZFQ