Date   

QCX Mini Upgrde ...

Andrew Cunningham
 

Hans ...


Loved the video ... will watch it over & over I know 


Can we have a “ Micro CW Key “ from Brass or Alu ... maybe to go along with the radios


( Use & Love My KK5PY Micro Te-Ne-Ke )


http://g0mwt.org.uk/skills/cars-skills-aug2015.htm?LMCL=H7gKGd


Dunno if you’ve implemented “ Continuous Drive Control “ Yet with the aid of a Linear Pot Switch or Flick Switches


But I still think this a great, neat idea ... particularly for folks wanting to really push the challenge both in & outdoors


Up The Mountains Of Our World-Audience with this 


“ Easy To Achieve dB Cut-Back “ Feature would be a great selling point


I’m a REAL QRPp Freak As well as QRP who hasn’t tried QRPp yet but is dyin to go - 


Just can't find “ An easy minimalist way of achieving this “ 


From the confines of my Bed !  Due to health issues


Before I go Hans - What QCX’s On HF Bands as selling point are still available I have few Bands I’d love to fill


Thanks Man For All The Years Of Excellent Work


Sent From Andy - GM0NWI’s  iPhone


Re: QCX-mini update

Kees T
 

Hans,

Amazing, you did it !! ...not that I had any doubts. Excellent Human Factors testing with the LCD, sunglasses, etc. I like those much better than the blue ones. 

Very impressed with the overall QCX-Mini ....and the small uSDX daughter card is the icing on the cake. Yes. please include it with the kit.

Great work !! Can't wait to order.

73 Kees K5BCQ


Re: QCX+ T1 Toroid Wire Length? #20m #qcx+ #20m #toroid

Chuck ke9uw
 

The wire supplied is 28 ga and the length for the 80M T1 T50 large winding is 48 inches. You can scale with that for the other bands. The toroids are T37 instead of T50 so I’m going to guess that the wire required is about 37/50 ths of what they would have been if they were T50s.


Re: QCX-mini update

Hans Summers
 

Hi Michael

Shout out to the Norcal 40A in the background of the QCX Mini video :)

I had an original back when they came out. Never finished it and it was lost to the turmoils of a tumultuous life. For the memory I bought another from Wilderness at Ozarcon 2007. I built it but the frequency annunciation didn't work and I didn't have time at that moment to investigate that... so put it on the shelf. Where it still sits 13 years later. Different continent (twice), different shelf (thrice). Same concept. I'll fix it one day...

73 Hans G0UPL 


Re: QCX-mini update

Hans Summers
 

Good point, I forgot that. Thanks for fhe reminder. I must see if I can put them in. Edge mount? How can that work... the edge is up against the enclosure wall. 

73 Hans G0UPL 

On Fri, Sep 11, 2020, 22:31 <namerati@...> wrote:
No alternate pads for an SMA connector?


On Fri, Sep 11, 2020 at 07:23:16PM +0300, Hans Summers wrote:
>Hi all
>
>I am excited to provide an update on the QCX-mini project
>http://qrp-labs.com/qcxmini.html
>
>Again to stress: QCX-mini has the same schematic (almost), firmware,
>operation and performance as QCX and QCX+. It is just a different physical
>manifestation. This is not a major R&D effort. It is a pleasant breather.
>The tasks are limited to mechanical re-engineering and some
>re-documentation later. So please don't all start yelling at me about what
>I ought to be spending my time and energy on instead.
>
>To summarize: I laid out a PCB. Two in fact (it's a sandwich). And got some
>made. I have ordered two sets of components and one set arrived yesterday;
>the other (the bulk of the R and C, SMD parts from Farnell UK) will arrive
>in about 1 week. I designed an enclosure and made technical drawings, and
>my usual enclosure factory has produced a prototype to my specification,
>which is in the post and will likely get here in about 2 weeks from now.
>
>So far everything fits together very well and at this stage I do not
>anticipate any major roadblocks.
>
>It's a really beautiful little radio! I am looking forward to hauling
>myself to a nearby mountain to try it out.
>
>73 Hans G0UPL
>http://qrp-labs.com
>
>
>





Re: QCX-mini update

Michael N6MST
 

Shout out to the Norcal 40A in the background of the QCX Mini video :)


Re: QCX-mini update

namerati@...
 

No alternate pads for an SMA connector?

On Fri, Sep 11, 2020 at 07:23:16PM +0300, Hans Summers wrote:
Hi all

I am excited to provide an update on the QCX-mini project
http://qrp-labs.com/qcxmini.html

Again to stress: QCX-mini has the same schematic (almost), firmware,
operation and performance as QCX and QCX+. It is just a different physical
manifestation. This is not a major R&D effort. It is a pleasant breather.
The tasks are limited to mechanical re-engineering and some
re-documentation later. So please don't all start yelling at me about what
I ought to be spending my time and energy on instead.

To summarize: I laid out a PCB. Two in fact (it's a sandwich). And got some
made. I have ordered two sets of components and one set arrived yesterday;
the other (the bulk of the R and C, SMD parts from Farnell UK) will arrive
in about 1 week. I designed an enclosure and made technical drawings, and
my usual enclosure factory has produced a prototype to my specification,
which is in the post and will likely get here in about 2 weeks from now.

So far everything fits together very well and at this stage I do not
anticipate any major roadblocks.

It's a really beautiful little radio! I am looking forward to hauling
myself to a nearby mountain to try it out.

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



Re: QCX-mini update

Hans Summers
 

Hi Bob

It's a different pot. Smaller size and green. The pins stick out of the plastic body. More pricey but I needed the small size. See attached.

73 Hans G0UPL 


On Fri, Sep 11, 2020, 22:11 Bob M. <wa1mik@...> wrote:
Looks like a bunch of nice improvements.

From reading lots of posts here, it does seem as if a lot of people had problems with the 5k volume control lugs either disconnecting from the phenolic or losing contact elsewhere. Does your new design address this problem at all, either by a different wiring method or a different pot?

Bob M.


Re: QCX+ mechanical problem

Jim Manley
 

I haven't found it necessary to drill/file/sand any nuts, but I do occasionally find that scratching them to be beneficial during extended build sessions.  Scratching a line on a nut and the PC board helps identify their correct orientation when adequately tightened if I have to disassemble and reassemble boards - what was your mind-in-the-gutter thinking?  I will now return to my hidey-hole to avoid massive incoming flak anyway!


Re: QCX-mini update

Bob M.
 

Looks like a bunch of nice improvements.

From reading lots of posts here, it does seem as if a lot of people had problems with the 5k volume control lugs either disconnecting from the phenolic or losing contact elsewhere. Does your new design address this problem at all, either by a different wiring method or a different pot?

Bob M.


Re: QCX-mini update

Ben
 

Wow, that is a good looking transceiver! For you not a major effort, but man, I am amazed ^_^ Even the alignment pots are reachable. I also like the CAT and PTT ports for when using the rig at home.


Re: Nice power supply for 50 Watt amp

R. Tyson
 

G'day sport,
Thanks for the comment. I like the sense of humour  >:-)

I guess these AC chargers are a few years old so may be better than new stuff.

73's
Reg          G4NFR


Re: QCX+ mechanical problem

Sheldon Hartling
 

Hi Elwood,

I didn’t find It necessary to drill out any nuts/spacers.  I did however find it useful to cut down two of the nylon nuts.
Details (pictures) here.

73, Sheldon VE1GPY


Re: Thoughts on Low Power and fewer turns on LP filter toroids

Steve in Okinawa
 

Very cool project, Hans. Now who will be the first to make a PPP (permeability power peaker) for a QCX? (And I noted the comment about your earthed soldering iron tip, for only today the mains GCFI blacked out the whole house when I attempted to solder some antenna coax braid.)     73,. Steve


Re: QCX-mini update

Brian George
 

Wow! It sounds absolutely fantastic. Can't wait to get one. Well done Hans - all your efforts are greatly appreciated.

73
Brian
G3ZOH


Re: QCX+ RF Power #qcx

Ronald Taylor
 

Hi  David. On the 20 Meter version, some folks find that removing a couple of turns from L1, L2 and L3 will increase power output, if the issue is a lower than expected power output due to lower than expected cutoff frequency of the lowpass filter. You can also spread or squeeze turns on these toroids to get some improvement. I wouldn't remove more than 2 turns unless you have a spectrum analyzer to verify you are still meeting the spurious output requirements.

This turns removal is mentioned in the last sentence before the conclusion in Hans' troubleshooting procedure. https://qrp-labs.com/qcx/qcxtrouble.html
which is a very interesting and informative read..... 73 ... Ron


On Fri, Sep 11, 2020 at 10:46 AM David Griffiths <davidmgriffiths42@...> wrote:
Across the resistors Evan, before the diode.

David
G4DMG


Re: QCX+ RF Power #qcx

David G4DMG
 

Across the resistors Evan, before the diode.

David
G4DMG


Re: QCX+ RF Power #qcx

Evan Hand
 

David,
Where are you measuring on the dummy load?  If across the resistors and not the power tap, then your power measurement is correct.  If you are using the Power Connection on the dummy load, that is rectified voltage, so you would use the Vp*Vp/100 to get the approximate power out.  That would then be more like 5 watts.

The most accurate would be across the resistors.

73
Evan
A


Re: QCX-mini update

Dave VE3GSO
 

Very exciting.  Just read the full description including photos and sports car and sunglasses.  I know a CW bicycle mobile practitioner who will benefit. (Not me!)

Dave


On Sep 11, 2020, at 12:23, Hans Summers <hans.summers@...> wrote:


Hi all

I am excited to provide an update on the QCX-mini project http://qrp-labs.com/qcxmini.html

Again to stress: QCX-mini has the same schematic (almost), firmware, operation and performance as QCX and QCX+. It is just a different physical manifestation. This is not a major R&D effort. It is a pleasant breather. The tasks are limited to mechanical re-engineering and some re-documentation later. So please don't all start yelling at me about what I ought to be spending my time and energy on instead. 

To summarize: I laid out a PCB. Two in fact (it's a sandwich). And got some made. I have ordered two sets of components and one set arrived yesterday; the other (the bulk of the R and C, SMD parts from Farnell UK) will arrive in about 1 week. I designed an enclosure and made technical drawings, and my usual enclosure factory has produced a prototype to my specification, which is in the post and will likely get here in about 2 weeks from now. 

So far everything fits together very well and at this stage I do not anticipate any major roadblocks. 

It's a really beautiful little radio! I am looking forward to hauling myself to a nearby mountain to try it out. 

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


Re: QCX+ mechanical problem

Bill Cromwell
 

Hi,

Filing a nut to get it to fit is good practice for scratch building gear:)

73,

Bill KU8H

bark less - wag more

On 9/11/20 12:57 PM, K3YV wrote:
Thanks much. I did take your advice but still had to file the nut to get it to fit. All ended well. 73