Date   

Re: Opinion sought! What's the best Morse decoder/sender on any platform?

Larry Taylor
 


Re: Opinion sought! What's the best Morse decoder/sender on any platform?

Larry Taylor
 

Budd Churchward makes the MorseDuino. Connects to the headphone jack on any transceiver. It’s Arduino based. It’s an excellent kit on the same quality level you from Hans. 


Re: Need a Builder

Pete Slugg <pete15013@...>
 

Yes, I’m in the Raleigh NC area.
Thanks, Pete K4PHS


Re: Need 0dbm (1mw) power reference

KEN G4APB
 

OK Shane,
I understand now. There was a dc blocking cap to the output, I have added pictures of the irf510 drive (CH1 -DC coupled- 0v on bottom line) for total input currents of 25mA, 50mA, 85ma and 150mA, each achieved as I increase the bias voltage, and CH2 shows the DC coupled output swing. You can see at 150mA level and highest I dare go, bias voltage gives a reduced output.

Also, the drive is not square wave, it is what I get using an ex-or gate as the oscillator, see pic of  level before buffer to .irf510.

73 Ke G4APB


Re: Need a Builder

Greg Walters
 

Howdy Pete, 

I have built 5 QCX originals, I think. Two for me and at least two for others, maybe three. 

I'd offer to finish your Ultimate, but if you are in any kind of rush, like before Thanksgiving, I wouldn't be helpful. 

I'm in a Master's program at the moment and won't get a break until December 4th. 

If you can stand to wait that long, I'd be happy to finish it for you. Naturally it'd get finished a week or so after the 4th. 

My email is good on QRZ if interested. 
--
73,
Greg
KY4GW


Re: QCX-mini kit manufacturing update

Marek SP9TKW
 

Hans,

Thanks for the update, it's really apreciated.

Personally, I can't wait when it will be available for order. 

---------------------------------
73 de Marek SP9TKW


Re: Looking for US3

Lex PH2LB
 

Hallo Hans, Mateo,

Thanks for explaning it. 

 


Re: QCX-mini kit manufacturing update

Shane Justice <justshane@...>
 

Hans,
Thanks for the update and status on your QCX Mini project! Isn't it amazing how decisions of other companies altering a time-honored configuration of a part probably made for 100 years or so can trip up a new design using the well worn methodology? How can that be "progress"?

Production manufacturing is always a challenge, as is obsolescence. That's another thing to keep up on. Back when I was having to watch out for such bugaboos, I subscribed to component manufacturers' alert services so I received notice when components were being marked EOL- End Of Life, so I could tell the supply folks to make lifetime buys to support the expected service lifetimes for products.

Just one more thing to do, among a chorus of one more things. Keep swinging, champ!

73,
Shane


On Oct 16, 2020 at 00:21, Hans Summers <hans.summers@...> wrote:

Hi all

All is progressing with the QCX-mini kit manufacturing, but perhaps a little more slowly than I'd like... but no major problems, just little things. 

We discovered we ran out of Si5351A chips in the warehouse and I had to order another 2500pcs reel from Digikey US, but they are asking lots of compliance questions for export (new rules?), before they'll ship the reel to the PCB assembly factory. 

The 5K gain potentiometer shown in the photos such as this one:
http://qrp-labs.com/images/qcxmini/update2/boards/20200924_112930.jpg
had a split ribbed shaft in the samples (not sure of the official name for this type of control shaft). But we need a round shaft with one flat face, like on the rotary encoder. Otherwise the gromet on the knob has to be fit into the split of the shaft, but then the white marking on the knob doesn't line up perfectly with how you expect it to be for minimum and maximum volume settings. Either that or I need a type of knob that suits the ribbed shafts rather than the type with a gromet screw. But then that might not match the rotary encoder shaft etc. If the gromet is tighened in the proper location then it squeezes the two halves of the split shaft together and the knob then ends up rotating in an off-center way. I don't like it. So... since no 5K pots of that style are available with 1/4-inch round-flat shaft, I decided to custom-manufacture a modified version of the 5K potentiometer which has the correct shaft type! 1000pcs custom manufacturing has a 10 day lead time and is already underway. 

The other thing requiring special manufacturing is the LCD module, the yellow/green type in the high quality module made by the QY company (as I have used in all QRP Labs kits for the last 7 years) is also not a commodity item and it needs to be manufactured to order, which is also a 10 day lead time. 

The enclosure manufacture is underway and so is the PCB manufacture. A lot of these things are all happening in parallel. 

Meanwhile I have been working on an enhancement to the QCX firmware, to add a way to switch the QCX-mini LCD module backlight on and off. Which is working fine now too. There's a menu item for the backlight (which is persisted in EEPROM through power cycling). You can also double-tap the rotary encoder shaft button to toggle the backlight, this state is not persisted in EEPROM. I think this is a reasonably convenient way to control the backlight. Though the firmware is the same as QCX/QCX+, these features will have no effect in a QCX/QCX+.

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


Re: 50W PA

Shane Justice <justshane@...>
 

Hi John,

I am awaiting the arrival of two components to finish my build of the QCX+, so I haven't read past the assembly portion of the manual yet. Having said that, look to see if there is a straight key mode in the menu. If so, follow those insyructions and you can use the appropriate tip/ring/ring connections on the paddle to put the radio in transmit. If you have a paddle handy, you can use it and just hold down either the dit or dah paddle to temporarily put the radio in transmit. I'm thinking Hans would have covered the bases here and have some comments about this situation. Hopefully I will get my parts tomorrow and will be performing these steps myself. I hope this helps!

73,
Shane
KE7TR


On Oct 15, 2020 at 21:41, John <valjomobile@...> wrote:

I have just completed building a QCX+ transceiver and a 50W PA amplifier.  I have calibrated and adjusted the QCX+ and are now about to adjust the 50W PA.  The manual for the 50W PA (section 7.4) mentions the use of a micro switch in the QCX to ‘key’ the 50W PA when adjusting.  Now that the QCX+ no longer has a micro switch can anybody advise me what builders do these days to ‘key’ the 50W PA?

Much obliged

John

VK8AL


Re: 50W PA

g4edg
 

Don't forget to put the QCX into practice mode while you set up the 50w amplifier bias.

Steve G4EDG


Re: Need 0dbm (1mw) power reference

Shane Justice <justshane@...>
 

Hi Ken,

I was wondering if there was DC offset of the waveform. The assymetry of the sinewave is curious. I am searching for the cause- if you travel back through the signal path, does the square wave have 50% duty cycle? If not, check the values of resistors and capacitors to make sure the right values are in circuit. There could be other reasons for the assymetry in the sinewave, but that's what strikes me here at first blush, in the middle of the night here.

I am interested to know what might be affecting this waveform.

73
Shane
KE7TR


On Oct 16, 2020 at 00:14, KEN G4APB via groups.io <lfoofui.nbz42@...> wrote:

Hi Shane,
The DC trace is the same, were you expecting anything different? My scope BW is 100MHz  and I am only looking at a 1.8MHz signal.

The sine wave in the ac coupled photo appears asymmetrical- top peaks are narrower than bottom/troughs. Also, at least one bottom trough has some non-smooth characteristics....
So...what are you suggesting?? I dont have an lpf cleaning this signal up as I wanted all the harmonics to come thru for use on higher bands.
 
The current drawn is 85mA, not 850mA. I was showing this as I thought it was too high, this is supposed to run from a PP3 battery.

73 Ken G4APB


Re: 50W PA

John <valjomobile@...>
 

Thanks Peter

Cheers

John

VK8AL

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Peter GM0EUL
Sent: Friday, 16 October 2020 4:28 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] 50W PA

 

Hi John
The micro switch in the old QCX was in parallel with the key Jack and worked as an integrated straight key.  Just connect a key or a switch to the key Jack of your QCX+ and use that.

Hope this helps
73
Peter GM0EUL


Re: 20m QCX+ internal battery pack connection point

Pierre Guillot <jc_glt@...>
 

Added to my former post this mini SWR indicator, which protects the finals during the tuning : 
 https://www.qrpkits.com/miniswr.html


Re: QCX-mini kit manufacturing update

Hans Summers
 

Thanks Jules

Yes, not easy! But this is not the first time I've made a kit :-)   So these things are all expected and known. What I neglected to mention, I also have to write the manual! 

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

On Fri, Oct 16, 2020 at 10:28 AM Julian Rolfe via groups.io <g4uet=yahoo.co.uk@groups.io> wrote:
Thanks for the update Hans. These progress reports really help explain how challenging manufacturing a ‘simple’ kit can be and hopefully folk are extremely appreciative of the considerable effort you are putting into what will be a fantastic addition to anyones radio ‘weaponary’.

Best and Thanks, 🙏
Jules - G4UET


Re: QCX-mini kit manufacturing update

Julian Rolfe
 

Thanks for the update Hans. These progress reports really help explain how challenging manufacturing a ‘simple’ kit can be and hopefully folk are extremely appreciative of the considerable effort you are putting into what will be a fantastic addition to anyones radio ‘weaponary’.

Best and Thanks, 🙏
Jules - G4UET


QCX-mini kit manufacturing update

Hans Summers
 

Hi all

All is progressing with the QCX-mini kit manufacturing, but perhaps a little more slowly than I'd like... but no major problems, just little things. 

We discovered we ran out of Si5351A chips in the warehouse and I had to order another 2500pcs reel from Digikey US, but they are asking lots of compliance questions for export (new rules?), before they'll ship the reel to the PCB assembly factory. 

The 5K gain potentiometer shown in the photos such as this one:
http://qrp-labs.com/images/qcxmini/update2/boards/20200924_112930.jpg
had a split ribbed shaft in the samples (not sure of the official name for this type of control shaft). But we need a round shaft with one flat face, like on the rotary encoder. Otherwise the gromet on the knob has to be fit into the split of the shaft, but then the white marking on the knob doesn't line up perfectly with how you expect it to be for minimum and maximum volume settings. Either that or I need a type of knob that suits the ribbed shafts rather than the type with a gromet screw. But then that might not match the rotary encoder shaft etc. If the gromet is tighened in the proper location then it squeezes the two halves of the split shaft together and the knob then ends up rotating in an off-center way. I don't like it. So... since no 5K pots of that style are available with 1/4-inch round-flat shaft, I decided to custom-manufacture a modified version of the 5K potentiometer which has the correct shaft type! 1000pcs custom manufacturing has a 10 day lead time and is already underway. 

The other thing requiring special manufacturing is the LCD module, the yellow/green type in the high quality module made by the QY company (as I have used in all QRP Labs kits for the last 7 years) is also not a commodity item and it needs to be manufactured to order, which is also a 10 day lead time. 

The enclosure manufacture is underway and so is the PCB manufacture. A lot of these things are all happening in parallel. 

Meanwhile I have been working on an enhancement to the QCX firmware, to add a way to switch the QCX-mini LCD module backlight on and off. Which is working fine now too. There's a menu item for the backlight (which is persisted in EEPROM through power cycling). You can also double-tap the rotary encoder shaft button to toggle the backlight, this state is not persisted in EEPROM. I think this is a reasonably convenient way to control the backlight. Though the firmware is the same as QCX/QCX+, these features will have no effect in a QCX/QCX+.

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


Re: Need 0dbm (1mw) power reference

KEN G4APB
 

Hi Shane,
The DC trace is the same, were you expecting anything different? My scope BW is 100MHz  and I am only looking at a 1.8MHz signal.

The sine wave in the ac coupled photo appears asymmetrical- top peaks are narrower than bottom/troughs. Also, at least one bottom trough has some non-smooth characteristics....
So...what are you suggesting?? I dont have an lpf cleaning this signal up as I wanted all the harmonics to come thru for use on higher bands.
 
The current drawn is 85mA, not 850mA. I was showing this as I thought it was too high, this is supposed to run from a PP3 battery.

73 Ken G4APB


Re: 50W PA

Peter GM0EUL
 

Hi John
The micro switch in the old QCX was in parallel with the key Jack and worked as an integrated straight key.  Just connect a key or a switch to the key Jack of your QCX+ and use that.

Hope this helps
73
Peter GM0EUL


50W PA

John <valjomobile@...>
 

I have just completed building a QCX+ transceiver and a 50W PA amplifier.  I have calibrated and adjusted the QCX+ and are now about to adjust the 50W PA.  The manual for the 50W PA (section 7.4) mentions the use of a micro switch in the QCX to ‘key’ the 50W PA when adjusting.  Now that the QCX+ no longer has a micro switch can anybody advise me what builders do these days to ‘key’ the 50W PA?

Much obliged

John

VK8AL


Re: Need a Builder

Shane Justice <justshane@...>
 

Bob,
Looks like Pete is in North Carolina.

Shane


On Oct 15, 2020 at 17:13, N3MNT <bob@...> wrote:

Where are you located?