Date   
20m QCX Slight Tapping Sound

Curt M.
 

Hi everyone, I finished my QCX last month and it works very well but I do seem to get a light 'tap, tap, tap, tap" sound at perfectly repeatable intervals.  It not extremely bad but it would be nice to eliminate it.  I get that sound if it's running on battery power or on a 13.8v power supply so it almost seems like something with the processor or maybe clock frequency;  

If I press the menu button to go in and change something the tapping sound stops completely.  When I exit out of the menu mode the tapping sound comes back. The sound is just slightly above the noise and if I remember correctly, the sound changes volume a little as I tune around the 20m band and in some parts of the band it almost disappears.

Any ideas?

Curt M.

Re: What do you use your spare button for on your U3S case??

Ton - PA0ARR
 

You could also use this tool:
Https://yo6ssw.github.io/u3s-eeprom-tool/
Use a programmer to get the eep file from the 328. With the tool you can edit the whole eeprom and write it back with the programmer.
73 Ton PA0ARR

Re: OLED screen for QCX

ve3smf
 

Looking at the specifications, rated from minus 40C to 80 C.

Ref: https://www.mouser.ca/datasheet/2/271/REC001602AWPP5N00000%20datasheet-760677.pdf

5.Absolute Maximum Ratings
Item Symbol Min Max Unit Notes Operating Temperature TOP -40 +80 ℃ 
Storage Temperature TST -40 +80 ℃ 
Supply Voltage For Logic VDD-VSS -0.3 5.3 V 

Thanks for asking this question.  I am working on another project that this information will help.

Stuart VE3SMF VE8SMF

 

Re: Help with 1.00g QCX Firmware Upgrade File #firmware #qcx

Curt M.
 

Thanks Hans, that's what I ended up doing.  I stumbled upon that by accident the other night.

Curt M.

Re: What do you use your spare button for on your U3S case??

KEN G4APB
 

You could of course record the reference frequency after calibration and simply re-set it again in the menu after a reset. You would not need to run hours of cal cycles then. Also to run repeated cal cycles, set to one wspr cycle and set Frame to 04 00 and Cal to 10 115.
73 Ken g4apb

What do you use your spare button for on your U3S case??

m0bmn
 

Hi all

I don’t know if your anything like me but I am always playing with my U3S kit and changing synths, or settings, ending up doing a reset etc and I got fed-up of waiting hours for the calibration to get me on frequency (and causing QRM) sometimes.

I have now fitted a small ATTINY85 module that activates the menu and edit buttons to do as many calibration cycles as I need without me having to keep pressing buttons and sitting there for ages.

I just toggle the spare button and walk away, have a cuppa and come back to a nicely calibrated U3S.

Here is the circuit I use.

If anyone knows any reason that I should not do this PLEASE let me know.

 

 

The Calibrate switch is the spare switch on the QRPLabs case if you use it, other wise any switch will do. It seems to work fine without any problems. It will just keep running the calibration cycle until you toggle the spare switch off again. I find I need about 6 or 7 cycles on my settings when I change the synth from standard to txco or back again, or following a reset.

Here is the code if anyone wants to make one (please don’t laugh to loud when you see my bad coding!) if you cant setup your module I can provide one programmed at cost (£5 inc Post) but it’s a good learning experience to roll your own if you can.

 

//U3S calibration

//By P.WEBB M0BMN

//Feel Free to do what you will with this

// Use at your own risk!! but works fine for me!

int MenuPin=0;//menu switch pin number

int EditPin=1;//edit switch pin number

int CalPin=2;//Calibrate switch pin number

bool Cal=HIGH;

void setup() {

pinMode(MenuPin,OUTPUT);

pinMode (EditPin,OUTPUT);

pinMode (CalPin,INPUT_PULLUP);

}

void loop() {

Cal=digitalRead(CalPin);

if (Cal==LOW){

    Calibrate();

    delay(40000);// time to wait while calibration takes place

  }// Above time (40 sec's) is adjustable if you wish, my cal time is set to 30 secs.

}

void Calibrate(){

digitalWrite(MenuPin,HIGH);

delay (6000);

digitalWrite(MenuPin,LOW);

delay(1000);

digitalWrite(EditPin,HIGH);

delay(250);

digitalWrite(EditPin,LOW);

}

Re: Absolute frequency accuracy vs. drift during a WSPR report?

John Canfield
 

Thanks Alan.
--
John, WB5THT

Re: Balloon

Braden Glett
 

Wow, that is extremely cool. I would have been too unsure of the jurisdictional issues surrounding such an effort to actually pull the trigger on it, thankfully not everyone is as big a scaredy-cat as I am. (Or, more likely, they actually know the legalities surrounding this sort of thing, lol!)
GREAT JOB, MIKAEL!!

Re: Absolute frequency accuracy vs. drift during a WSPR report?

Alan G4ZFQ
 

I continue to be somewhat puzzled about frequency accuracy compared to drift as reported by WSPR receiving stations. Here's an example from a recent 30 meter report:
Wouldn't my GPS re-calibrate the oscillator after transmissions? I do realize we are dealing with a few variables here like drift of the receiving stations, etc. I have a new OXCO I haven't put into service on this particular U3S so I need to play with that (without the GPS interface.)
John,

You reported frequency is best ignored unless you know it is from a station of good repute. WSPRnet just reports an average in the "Activity" window.
Yes they both report zero drift, a rather more reliable measurement. Those very few with RX drift would normally be noticed by being the only one who reports drift.
I've noted the OCXO/GPS comments, I think that no GPS is only relevant when setting up. You may then use GPS to calibrate the U3S.

73 Alan G4ZFQ

Re: Help with 1.00g QCX Firmware Upgrade File #firmware #qcx

Hans Summers
 

Hi all

If you right click and then click save, it should just save the .hex file on your local disk. Doesn't change it at all. No kind of viewing or editing is needed. Avrdude will process it directly.

73 Hans G0UPL 



On Fri, Feb 22, 2019, 17:00 Ken Talbott <ktalbott@...> wrote:
When you click the link, the browser attempts to open the file. The CR/LF that should terminate each line is lost. Save this file, the use use an editor to ensure that each line had proper termination, including the last line in the file. The file then loads properly. 
ken ke4rg

Absolute frequency accuracy vs. drift during a WSPR report?

John Canfield
 

I continue to be somewhat puzzled about frequency accuracy compared to drift as reported by WSPR receiving stations. Here's an example from a recent 30 meter report:


2019-02-21 23:40   WB5THT   10.140248   -21   0   EM00   0.5   WA1DLZ   FN54bp   2990   50 
 2019-02-21 23:20   WB5THT   10.140159   -25   0   EM00   0.5   VE3PRO   EN94hk   2191   40 

My second U3S (with the non-OXCO oscillator) transmit frequency is set to 10.140202 for the 30 meter band. So what I'm seeing in the above report is my reported receive frequency is 10.140248 and 10.140159 by two different stations but during their receive my transmitter had zero drift. Is this correct? The above somewhat random frequency delta is repeated by various receive stations for 20 and 30 meters.

Wouldn't my GPS re-calibrate the oscillator after transmissions? I do realize we are dealing with a few variables here like drift of the receiving stations, etc. I have a new OXCO I haven't put into service on this particular U3S so I need to play with that (without the GPS interface.)


--
John, WB5THT

Best decoder setting results #qcx

Ted 2E0THH
 

Just interested what everyone is using for their best results with the QCX?
I've recently deferred to the settings in the manual (which I assume are the defaults)

73s Ted
M7ECH

Re: Help with 1.00g QCX Firmware Upgrade File #firmware #qcx

Ken Talbott
 

When you click the link, the browser attempts to open the file. The CR/LF that should terminate each line is lost. Save this file, the use use an editor to ensure that each line had proper termination, including the last line in the file. The file then loads properly. 
ken ke4rg

Re: Broken R36 B5K 5K Logarithmic potentiometer #parts

Zdenek OK2BQN
 

Re: Broken R36 B5K 5K Logarithmic potentiometer #parts

Richard G4TGJ
 

Why not ask QRP Labs for a replacement?
--
73
Richard
G4TGJ

Re: OLED screen for QCX

Hans Summers
 

Hi James

If you want to send me one of the ones that doesn't work I can see if there is an easy timing modification I can do, to fix it. 

73 Hans G0UPL

On Fri, Feb 22, 2019 at 9:28 AM <qrplabs@...> wrote:
Ahoy folks,

I've been digging options for getting an OLED working with my QCX.  The biggest issue that I keep running into is the timing requirements of these displays, as mentioned above.  They needs some slightly different delays to behave properly, but they do work.  That being said, here's what I've encountered thus far as I've experimented with these displays:
  • Mircrotips OLED (https://www.mouser.com/ProductDetail/668-REC001602AYPP5N - the picture is wrong in this listing) My first choice, if only for the sunlight readability.  5V, same pinout, same interface expectations.  Only issues are some wandering text / other artifacts due to the aforementioned timing.  But for that, this sunlight readable OLED would be an awesome upgrade. Datasheet reports a typical power draw of 46mA, max draw of 54mA, not verified.  Interestingly, the display manufacturer sticker says "RAYSTAR"
  • Adafruit OLED a.k.a. Winstar (https://www.adafruit.com/product/823) - Was a bit surprised to discover that, by all indications, this is the same board as above.  Winstar, Raystar, and New Haven (below) are all the exact same board.  Same silk screen, same layout, same everything.  And the same behavior.  This one is a nice shade of blue, but beyond that, same as above. Datasheet reports 30mA typically, no listed max, not verified. 
  • New Haven (https://www.digikey.com/product-detail/en/newhaven-display-intl/NHD-0216KZW-AY5/NHD-0216KZW-AY5-ND/2626454) - Same song and dance as above. Datasheet reports 30mA typically, 50mA max, not verified.  Has a few more color options than the others.
  • New Haven (https://www.digikey.com/product-detail/en/newhaven-display-intl/NHD-0216SZW-BB5/NHD-0216SZW-BB5-ND/6564817) - slightly different in that this is a larger display.  pinout is a bit different, arranged 16,15,1-14 rather than 1-16.  Works if you take the time to breadboard it up, but not a direct plug in option.  A bit more power usage, with the datasheet reporting typical 62mA draw and a max of 65mA, but what do you expect for a larger display?
  • Vishay Dale - Not actually purchased, but from photos / datasheets, it appears again to be the same board as the others.  

So to sum it up: there are a number of OLED options that plug in and sort-of work.  Without the timing modifications to the source code, the radio is semi-usable, but annoying.  This is a modification / improvement that will have to wait for either some Hans time or for a new OLED producer to show up with a chipset that does a better job of emulating the LCD 16x2 options that are currently on the market. 

James
ww0o




Re: OLED screen for QCX

qrplabs@...
 

Ahoy folks,

I've been digging options for getting an OLED working with my QCX.  The biggest issue that I keep running into is the timing requirements of these displays, as mentioned above.  They needs some slightly different delays to behave properly, but they do work.  That being said, here's what I've encountered thus far as I've experimented with these displays:
  • Mircrotips OLED (https://www.mouser.com/ProductDetail/668-REC001602AYPP5N - the picture is wrong in this listing) My first choice, if only for the sunlight readability.  5V, same pinout, same interface expectations.  Only issues are some wandering text / other artifacts due to the aforementioned timing.  But for that, this sunlight readable OLED would be an awesome upgrade. Datasheet reports a typical power draw of 46mA, max draw of 54mA, not verified.  Interestingly, the display manufacturer sticker says "RAYSTAR"
  • Adafruit OLED a.k.a. Winstar (https://www.adafruit.com/product/823) - Was a bit surprised to discover that, by all indications, this is the same board as above.  Winstar, Raystar, and New Haven (below) are all the exact same board.  Same silk screen, same layout, same everything.  And the same behavior.  This one is a nice shade of blue, but beyond that, same as above. Datasheet reports 30mA typically, no listed max, not verified. 
  • New Haven (https://www.digikey.com/product-detail/en/newhaven-display-intl/NHD-0216KZW-AY5/NHD-0216KZW-AY5-ND/2626454) - Same song and dance as above. Datasheet reports 30mA typically, 50mA max, not verified.  Has a few more color options than the others.
  • New Haven (https://www.digikey.com/product-detail/en/newhaven-display-intl/NHD-0216SZW-BB5/NHD-0216SZW-BB5-ND/6564817) - slightly different in that this is a larger display.  pinout is a bit different, arranged 16,15,1-14 rather than 1-16.  Works if you take the time to breadboard it up, but not a direct plug in option.  A bit more power usage, with the datasheet reporting typical 62mA draw and a max of 65mA, but what do you expect for a larger display?
  • Vishay Dale - Not actually purchased, but from photos / datasheets, it appears again to be the same board as the others.  

So to sum it up: there are a number of OLED options that plug in and sort-of work.  Without the timing modifications to the source code, the radio is semi-usable, but annoying.  This is a modification / improvement that will have to wait for either some Hans time or for a new OLED producer to show up with a chipset that does a better job of emulating the LCD 16x2 options that are currently on the market. 

James
ww0o




Re: Broken R36 B5K 5K Logarithmic potentiometer #parts

bernd@...
 

Thanks a lot. I think i will be able to fix this now <3

Re: QSX: What will happen if and when the kit is available? #qsx

Hans Summers
 

 
My only question is how the multi-band will come out. Will it only be single-band at first?

Yes, this is explained on http://qrp-labs.com/qsx . First it's a single band. When it is launched, I will finish the multi-band filter board. The rest of the radio, and the PA, already work for any HF band. Later you can upgrade it to multi-band.
 
If I get it assembled by you will I be able to install the multi-band upgrade easily or will it involve soldering? I'm not against soldering, just not as skilled and lacking in resources.

I have not considered yet whether we will offer it in an assembled form like we do for QCX on a limited basis.  

The filter module is a plug-in unit; but you would need to solder the connectors to the main board.

73 Hans G0UPL

Re: QSX: What will happen if and when the kit is available? #qsx

Andrew K8AKC
 

My only question is how the multi-band will come out. Will it only be single-band at first? If I get it assembled by you will I be able to install the multi-band upgrade easily or will it involve soldering? I'm not against soldering, just not as skilled and lacking in resources.