Date   

Re: QCX Challenge poll #poll-notice

Shane Justice <justshane@...>
 

Reg,
Amen.

73,
Shane
KE7TR


On Nov 6, 2020 at 12:11, R. Tyson via groups.io <tysons2@...> wrote:

"Posters on this and some other lists may have bibles that say QRP is always 5 watts or less. So that is what it probably means here. In the wider universe - probably not.
73,
Bill KU8H"

No bibles and the wider universe probably agrees with the logic.
I am not sure when QRP , as it is now recognised, actually started. I do know the G-QRP club started somewhere about the mid 1970's. QRP power levels are widely recognised and where agreed upon many years ago. Organisations in many countries agreed on what power levels constituted QRP and it is widely known and understood today.

There is no ambivalence and no "bibles" it is just commonly understood and agreed power levels that constitute QRP. It's an ethos as much as anything and anyone who ever considered 50 watts or more as QRP has never taken onboard the ethos. The thing is... you don't have to abide by the rules but if you don't then you can't claim to be running QRP.

In the USA and UK your licence requires you to use "the minimum amount of power necessary to carry out the necessary communication"  I doubt 1 kw is normally needed !

Reg                 G4NFR


Re: Alignment no definite peaks QCX+

Shane Justice <justshane@...>
 

Ed,

Hang in there buddy. Getting to know a technology radically different from Syperherterodine can be frustrating, as well as full of mystery, but it is possible.

As Hans layer out, it really is as simple as checking the voltages at the input and output of all the opamps in the I and Q paths. If you don't see the midrange values at each opamp that are documented in Hans' assembly and troubleshooting guides, then stop on that stage and concentrate your efforts on determining what is wrong there.

When I had difficulties with my QCX+ kit, I took the schematic from the troubleshooting guide with the I and Q chains highlighted, and wrote down the voltages at every circuit node, directly on the schematic first, then compared them with the table in the troubleshooting guide, and found the precise location of the difficulty- in my case, I had a short - a solder bridge between two resistors of IC7, if I remember correctly.

So, go fish the project out of the recycle container and give it another try! Take your time, and if you get frustrated, take a break until you feel like trying again. You'll get there! We are all here to help each other. I suspect we have all been where you are now, so please don't feel like you are alone on this adventure. You have lots of company.

73,
Shane
KE7TR


On Nov 5, 2020 at 07:14, Ed <k6sdw.usa@...> wrote:

Thank everyone for all your help......I turned QCX+ on yesterday and now no display data.....I'm done, I've spent too much time troubleshooting the kit so the QCX+ went into the recycle bin. The only part I kept is the case. And yes, all my problems were self made, Hans makes a decent kit.

73 ~ ed


Re: decrease in power #wspr

claude P.
 

thank you all i'm going to work
--
Claude QCX france


#clock TMP-36 Temperature Sensor #clock

Luciano Gasparini
 

I recently added one TMP-36 temperature sensor to my clock, though it usually shows temperatures 6°C higher than the real one compared to other thermometers.
Is there any way to adjust it so that it matches the real temperature?

73,
Luciano PT9KK


Re: decrease in power #wspr

Jim Painter
 

On Nov 7, 2020, at 8:00 AM, claude P. <clpagesoph@...> wrote:

would you have a diagram
--
Claude QCX france


Re: decrease in power #wspr

Jim Painter
 

Claude, here is a link to a youtube 10db attenuator.

https://youtu.be/uMYaOATGpbc

Jim...kq3s



On Nov 7, 2020, at 6:36 AM, claude P. <clpagesoph@...> wrote:

hello
With a 7 volt supply, on 20 meters, I get 200 mw, measured with the oscilloscope. Below 7 volts qcx + stops which is normal. I would like to try it below 200mw, for fun. How to reduce the power? Hans, the qcx+ is too good!
--
Claude QCX france


Re: decrease in power #wspr

claude P.
 

would you have a diagram
--
Claude QCX france


Re: decrease in power #wspr

Hans Summers
 

Hi Claude

Attenuators! At 200mW there won't be any trouble with power dissipation etc. It should be easy to build suitable pi-network attenuators for 3dB, 6dB, 10dB whatever... and pop it between the RF output and your antenna system.

73 Hans G0UPL 

On Sat, Nov 7, 2020, 14:36 claude P. <clpagesoph@...> wrote:
hello
With a 7 volt supply, on 20 meters, I get 200 mw, measured with the oscilloscope. Below 7 volts qcx + stops which is normal. I would like to try it below 200mw, for fun. How to reduce the power? Hans, the qcx+ is too good!
--
Claude QCX france


decrease in power #wspr

claude P.
 

hello
With a 7 volt supply, on 20 meters, I get 200 mw, measured with the oscilloscope. Below 7 volts qcx + stops which is normal. I would like to try it below 200mw, for fun. How to reduce the power? Hans, the qcx+ is too good!
--
Claude QCX france


Re: Control of backlight on QCX+

Hans Summers
 

Hi John

Yes that would work well, and is a very good use for the modification, on a standard QCX/QCX+. The blue LCDs are not readable with no backlight. But reduced lighting would often make sense. Actually I think I will make this mod on both my QCX 40 and QCX+ 20 here! Often if I'm operating in the Zombie shift of the QCX Challenge at  0300-0400Z which in my timezone is 6-7am, in reduced lighting it would be nice to make the LCD less glaring, at the click of a button!

73 Hans G0UPL

On Sat, Nov 7, 2020, 02:03 John Pagett via groups.io <john.pagett=virgin.net@groups.io> wrote:
Presumably the BSS123 could be shunted with a suitable resistor (drain to source) so that the brightness is toggled between full and dim...

John
G4YTJ






Re: 40 meter QCX Classic in BamaTech Case For Sale

nz0tham@...
 

I will entertain reasonable offers!

73, Bill NZ0T


Re: QCX Challenge poll #poll-notice

@CurtisM
 

Reg

a bit before my time, but on this side of the pond a group called QRP ARCI was among the pioneers.  funny thing they started with QRP being 100 watts or less (was this input or output power okay trivia) but the leadership pushed the matter of limiting QRP to 5 watts or less output power.  was this because it was a then perceived transistor limit? 

now the matter of QRP SSB is a bit controversial -- some contests require 5 watts or less but there is some convention for allowing 10 watts.  yes when the ions are strong SSB can do QRP - I have had some surprising contacts with my uBitx.  and I remember a QSO with an OM who was portable near the sea when I was using my FT817 into my 2 element yagi likely on 20m. 

okay one can cite these limits as convention, I think the OM referencing the Bible was tongue-in-cheek ... but in an older English translation I think the word solder does appear there. 

for WSPR my view is the barefoot U3S is 'real qrp' for that mode - as 200 mW crosses oceans on 7 and 10 MHz rather easily from my verticals.  but I confess I need to QRO on the lower bands. 

enjoy your radiations all

curt wb8yyy


Re: Control of backlight on QCX+

John Pagett
 

Presumably the BSS123 could be shunted with a suitable resistor (drain to source) so that the brightness is toggled between full and dim...

John
G4YTJ


Re: Control of backlight on QCX+

G3SPL
 

Great!  Many thanks Bruce.
--
Peter Lee
G3SPL


Re: Control of backlight on QCX+

Bruce K1FFX
 

I think this is what you are looking for:

https://groups.io/g/QRPLabs/message/55088

- Bruce K1FFX


Control of backlight on QCX+

G3SPL
 

I seem to recollect Hans saying that he would post the modification needed so that the QCX+ backlight can be controlled using firmware 1.06.  I can't find this anywhere.  I want to see what is required to do this.  I have already increased the value of the feed resistor to 560 ohms which still gives a very adequate brightness and saves about 15mA of battery drain (from memory).  But, if the mod is simple, I might consider doing it to have the option of disabling the backlight at times.
--
Peter Lee
G3SPL


Re: VFO/Signal Generator with offset

Hans Summers
 

Mont, Samuel

No need for anyone to feel stupid, not at all. This stuff can be rather confusing... I'm just glad we could clear it all up. And glad there isn't any issue in the firmware that I'd have to spend scarce time investigating and fixing ;-)

73 Hans G0UPL 

On Fri, Nov 6, 2020, 17:35 <samuel@...> wrote:
Mont

I appreciate you trying to help me.

We can both go to the "feeling stupid" corner for a while

Samuel 


Re: QCX+ and QLG1 GPS issue

Hans Summers
 

Hi Michael 

Thanks for the very nice feedback. The manual is good, but where it can be improved I'm pleased to take the feedback to make it better still. There's a huge amount of work behind these kits and all by me, so I'm not surprised if sometimes there are errors or omissions, or something could be expressed more clearly. 

Regarding your "no fixes" problem this is simply a problem in the firmware with parsing the GPS serial data. The display f-- is incorrect. I found the solution only recently and implemented it in firmware version 1.06. Your QLG1 GPS is certainly using satellites in its position fix computation, at least 4... if it is not, it cannot display the A or produce a 1pps signal (green flashing LED). The problem is just a firmware bug which in some circumstances prevents the information being properly parsed and displayed. (Don't bother to take it to an open space, it won't change anything). 

Have fun!

73 Hans G0UPL 


On Fri, Nov 6, 2020, 18:35 Michael Greene <kn6ize@...> wrote:
Hans,
Thank you for being so amazingly attentive to the quality of your product. One of the very best parts of this quality is the manual. Please don't take my explanation as a criticism in any way, only a description of why I mis-interpreted things because I did not fully understand how the radio was designed to handle the multi-use of the paddle inputs.
In some happy news, I am now able to use 8.11 and 8.12 successfully. Also, in Beacon mode, I see the GPS is now updating the grid square and clock. On menu 8.13, it shows an A for valid reading and shows the number of satellites and signal strength. I'm not yet getting any fixes, but the GPS is inside my house, so I need to take it to a spot where I know it has a clear shot and see if that helps. In any case, I think I'm good enough to operate the way I want to.
Next up, I'm thinking to couple the QRP Labs clock with another QLG1 GPS and I'll have a super shack clock.
Thanks for all your patience and explanation. Being new to ham radio and building, I am really pleased with your support and the products you offer and the amazingly helpful community in this group.
Michael


Re: QCX Challenge poll #poll-notice

R. Tyson
 

"Posters on this and some other lists may have bibles that say QRP is always 5 watts or less. So that is what it probably means here. In the wider universe - probably not.
73,
Bill KU8H"

No bibles and the wider universe probably agrees with the logic.
I am not sure when QRP , as it is now recognised, actually started. I do know the G-QRP club started somewhere about the mid 1970's. QRP power levels are widely recognised and where agreed upon many years ago. Organisations in many countries agreed on what power levels constituted QRP and it is widely known and understood today.

There is no ambivalence and no "bibles" it is just commonly understood and agreed power levels that constitute QRP. It's an ethos as much as anything and anyone who ever considered 50 watts or more as QRP has never taken onboard the ethos. The thing is... you don't have to abide by the rules but if you don't then you can't claim to be running QRP.

In the USA and UK your licence requires you to use "the minimum amount of power necessary to carry out the necessary communication"  I doubt 1 kw is normally needed !

Reg                 G4NFR


Re: QCX Challenge poll #poll-notice

Evan Hand
 

We can discuss what the QRP power level is for other modes.  BUT, there is really only one mode for normal communication with the QCX: CW.  QRP is well defined for that mode - 5watts.  This could change when (if?) the QSX is released.  Until then CW is the mode.

In my opinion, we do not really need to get any deeper than that.
73
Evan
AC9TU

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