Date   
Re: QSX radio feature requests

ajparent1/KB1GMX
 

This seems to be splattered across three groups!.

QRPkits made the SLT.  I have one.  Its very slow to setup and a bit annoying.
If you've been tough it a few times its easy to get the last known setting... 
Its hard to know when your getting close as a little to either side and
the SWR is high.

The basic design was about the same coils and caps in powers of 2.
It also means for 7 coils and 7 caps 15 switches with 15th to select
which end the cap is at.  255 possible combinations. 

Automation is good.  Use latching relays and put the cpu to sleep when
done (Arduino can  do that).

Allison

Re: QSX radio feature requests

Alan de G1FXB
 

Hi Glenn / All,
That's a tidy looking build.

Another arduino flavour atu was started by Chris ZL1CVD, did anybody see anything on any suppositories?
The development looks to have stalled and nothing current on his site.
I was certain it was from him & you can guess what PCB I brought....

I've not compared them side by side, with the radio artisan project.
If all else fails I guess it's a case of comparing the relay strategy for L&C and set about changing any necessary pin allocations....?
               
            (Other than Hans, I'm not certain who else has moderator rights.
            Is it worth creating a sub group for dreamers, so we don't clutter the main message list.
            We have to play nicely with others who's only interest will be Pre U3S, U3S, QLG, Clock, VFO, ProgRock, QCX etc, etc...
            It will give them the opportunity to view rather than having it inflicted?)


Alan

On 25/08/2018 01:27, Glenn wrote:
The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe



Re: QSX radio feature requests

jmh6@...
 

Hi All,

Count me in.

John

On Fri, 24 Aug 2018, J68HZ wrote:

Hardware is done and?and  I must say it works extremely well.  One of the best
projects I?ve ever designed.  I?m Just waiting/ helping Jack with his JackAl
project so that I can coerce him into helping me with the coding for this
project.  As designed, it can work as an integrated-to-a-radio 100W tuner,
or just stand-alone.  Speaks several languages to do that.  What I
particularly like about it is that is tunes in less than a second worst case
(even with my kludgy excuse for code).  Stay tuned.  It?s still on target for
$35 or less.  Probably will be selling kits at Dayton next year.
 
I can?t post on the uBITx group any more so I guess you?ll hear it here first!
 
 
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
 
Owner - Operator
Big Signal Ranch ? K9ZC
Staunton, Illinois
 
Owner ? Operator
Villa Grand Piton ? J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com
Like us on Facebook! facebook icon
 
Moderator ? North American QRO Group at Groups.IO.
 
email:  @Doc_Bill
 
 
From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Kelly Jack
Sent: Friday, August 24, 2018 9:34 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QSX radio feature requests
 
Bill,
How are going with your tuner project?
Regards
Simon
VK3ELH
[icon-envelope-tick-green-avg-v1.png]
Virus-free. www.avg.com

Re: QSX radio feature requests

F1BFU - Fr - 79
 

Hello Glenn

Very good. Have you PCB or Where can I get the PCB and the schema?
Do you have documentation for the realization of the reels?

73 QRO Gilles F1BFU/FR


Le sam. 25 août 2018 à 02:27, Glenn <glennp@...> a écrit :
The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe




--
Gilles - F1BFU/FR

Re: QSX radio feature requests

Alan de G1FXB
 

Good afternoon Gilles,

Glenn is quite prolific with projects. Details here:-

http://www.carnut.info/K3NG_ATU/K3NG_Arduino_based_ATU.htm

to highlight just one of his builds.....


original concept was by

https://blog.radioartisan.com/arduino-antenna-tuner/


Alan


On 25/08/2018 11:54, F1BFU - Fr - 79 wrote:
Hello Glenn

Very good. Have you PCB or Where can I get the PCB and the schema?
Do you have documentation for the realization of the reels?

73 QRO Gilles F1BFU/FR

Le sam. 25 août 2018 à 02:27, Glenn <glennp@...> a écrit :
The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe




--
Gilles - F1BFU/FR

Re: Winding QCX T1 #qcx #t1

danielu@upcnet.ro danielu@upcnet.ro
 

Hello,

Here is the video.

https://www.youtube.com/watch?v=DDEPMdDcPOk&feature=youtu.be

Best regards.


Daniel

Re: QSX radio feature requests

Alan de G1FXB
 

Actually both Bill & Glenn's work feature in atleast one other place:-

https://groups.io/g/BITX20/topic/7723927?p=Created,,,20,1,0,0


Alan


On 25/08/2018 12:39, Alan de G1FXB via Groups.Io wrote:
Good afternoon Gilles,

Glenn is quite prolific with projects. Details here:-

http://www.carnut.info/K3NG_ATU/K3NG_Arduino_based_ATU.htm

to highlight just one of his builds.....


original concept was by

https://blog.radioartisan.com/arduino-antenna-tuner/


Alan


On 25/08/2018 11:54, F1BFU - Fr - 79 wrote:
Hello Glenn

Very good. Have you PCB or Where can I get the PCB and the schema?
Do you have documentation for the realization of the reels?

73 QRO Gilles F1BFU/FR

Le sam. 25 août 2018 à 02:27, Glenn <glennp@...> a écrit :
The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe




--
Gilles - F1BFU/FR


Re: QSX radio feature requests

Braden Glett
 

Allison,
My T1 tuner says it's good up to 20 watts. I've never tested that limit, but it sounds like you may have and found it to be incorrect?
Brady kd8zm

Re: QCX vol control and S mtr

Alan de G1FXB
 

Hi Bob,

S-Meter = Uncalibrated, both AF gain and the scaling setting see
Assembly manual section describing  alignment menu option 7.7
(Page No# 99 of the Version3 A4 formatted PDF, may be different depending on your version / locale)
Affect readout.


Alan

On 25/08/2018 15:13, Chopper wrote:
Not sure if I just did not pay attention to this before or if something has changed.  I noticed that the signal strength meter is effected by volume control.  ie if I increase the volume, the S mtr shows a stronger signal. Need to go look at circuit to see where S mtr is generated but afraid it is a software generated sig.  Is this correct operation?

Re: Winding QCX T1 #qcx #t1

terry murphy
 

Brilliant!


Thanks
Terry-W6LEO

Re: QSX radio feature requests

Arv Evans
 

Bill

My own QRP ATU uses binary progression of inductances with a 0-150 pf
variable cap and a switch for adding another 150 pf fixed C.  It doesn't seem
to be too much of a stretch to have the C values also binary progression. 
Might take a bit of thought for those not used to programming in machine
code but it does seem doable. 

I'm curious about how small latching relays work.  My only experience in
that area is with much larger units.  They had two coils, one to operate the relay
and another to release the lock.  Do the small ones work that way. or is
there some other methodology?  Magnetic latch?

Arv
_._


On Fri, Aug 24, 2018 at 8:17 PM J68HZ <bill@...> wrote:

Woah, wait.  Toggle switches to replace the relays???!!!!  So how do you propose that would work… do a binary search towards a low SWR solution?  That reminds me of loading the operating system into an ATARI 8080 system using front panel switches…  could take forever and a few days.  If you are worried about current draw, go with latching relays.  Back in March, I bought several hundred latching relays for $0.89 each… yes they can be had cheap if you buy them right from the source.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook!

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Arv Evans
Sent: Friday, August 24, 2018 8:18 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QSX radio feature requests

 

Glen

The K3NG ATU is an interesting design but uses several relays.  That is fine for automation

purposes, but I wonder if the design could be reproduced with a handful of DPDT rocker or

toggle switches replacing the relays.  Maybe there needs to be 2 versions of this well thought

out design, one that is automated and another that is manual for low current draw and increased

battery life for portable use.

Arv
_._

 

On Fri, Aug 24, 2018 at 6:27 PM Glenn <glennp@...> wrote:

The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe


Virus-free. www.avg.com

Re: QSX radio feature requests

jjpurdum
 

Arv:

Why machine code? Why not use C?

Jack, W8TEE

On Saturday, August 25, 2018, 11:22:29 AM EDT, Arv Evans <arvid.evans@...> wrote:


Bill

My own QRP ATU uses binary progression of inductances with a 0-150 pf
variable cap and a switch for adding another 150 pf fixed C.  It doesn't seem
to be too much of a stretch to have the C values also binary progression. 
Might take a bit of thought for those not used to programming in machine
code but it does seem doable. 

I'm curious about how small latching relays work.  My only experience in
that area is with much larger units.  They had two coils, one to operate the relay
and another to release the lock.  Do the small ones work that way. or is
there some other methodology?  Magnetic latch?

Arv
_._


On Fri, Aug 24, 2018 at 8:17 PM J68HZ <bill@...> wrote:

Woah, wait.  Toggle switches to replace the relays???!!!!  So how do you propose that would work… do a binary search towards a low SWR solution?  That reminds me of loading the operating system into an ATARI 8080 system using front panel switches…  could take forever and a few days.  If you are worried about current draw, go with latching relays.  Back in March, I bought several hundred latching relays for $0.89 each… yes they can be had cheap if you buy them right from the source.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Arv Evans
Sent: Friday, August 24, 2018 8:18 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QSX radio feature requests

 

Glen

The K3NG ATU is an interesting design but uses several relays.  That is fine for automation

purposes, but I wonder if the design could be reproduced with a handful of DPDT rocker or

toggle switches replacing the relays.  Maybe there needs to be 2 versions of this well thought

out design, one that is automated and another that is manual for low current draw and increased

battery life for portable use.

Arv
_._

 

On Fri, Aug 24, 2018 at 6:27 PM Glenn <glennp@...> wrote:

The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe


Virus-free. www.avg.com

Re: QSX PA board

ulidf5sf2002
 

Hello Hans,

have you meassured IMD3 and IMD5 on all band ?
I am curious about it.

Tanks
Uli
DF5SF

Re: QSX radio feature requests

Arv Evans
 

Jack

My comment was more about being familiar with binary progression than about
actually writing code.    8-)

Guess I'm showing my age if I admit that my first computer was a sales sample
8008 from Intel and it did boot to a paper-tape drive by entering the boot sequence
with toggle switches.  We have come a long way since then.

Arv
_._


On Sat, Aug 25, 2018 at 9:25 AM jjpurdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
Arv:

Why machine code? Why not use C?

Jack, W8TEE

On Saturday, August 25, 2018, 11:22:29 AM EDT, Arv Evans <arvid.evans@...> wrote:


Bill

My own QRP ATU uses binary progression of inductances with a 0-150 pf
variable cap and a switch for adding another 150 pf fixed C.  It doesn't seem
to be too much of a stretch to have the C values also binary progression. 
Might take a bit of thought for those not used to programming in machine
code but it does seem doable. 

I'm curious about how small latching relays work.  My only experience in
that area is with much larger units.  They had two coils, one to operate the relay
and another to release the lock.  Do the small ones work that way. or is
there some other methodology?  Magnetic latch?

Arv
_._


On Fri, Aug 24, 2018 at 8:17 PM J68HZ <bill@...> wrote:

Woah, wait.  Toggle switches to replace the relays???!!!!  So how do you propose that would work… do a binary search towards a low SWR solution?  That reminds me of loading the operating system into an ATARI 8080 system using front panel switches…  could take forever and a few days.  If you are worried about current draw, go with latching relays.  Back in March, I bought several hundred latching relays for $0.89 each… yes they can be had cheap if you buy them right from the source.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Arv Evans
Sent: Friday, August 24, 2018 8:18 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QSX radio feature requests

 

Glen

The K3NG ATU is an interesting design but uses several relays.  That is fine for automation

purposes, but I wonder if the design could be reproduced with a handful of DPDT rocker or

toggle switches replacing the relays.  Maybe there needs to be 2 versions of this well thought

out design, one that is automated and another that is manual for low current draw and increased

battery life for portable use.

Arv
_._

 

On Fri, Aug 24, 2018 at 6:27 PM Glenn <glennp@...> wrote:

The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe


Virus-free. www.avg.com

Re: QSX radio feature requests

jjpurdum
 

Arv:

I had the Altair "binary blisters" for several years, so I know what you mean. One of my favorite T-shirts say:

    There are 10 kinds of people in the world:
        Those who know binary and
        those who don't.

Jack, W8TEE

On Saturday, August 25, 2018, 11:43:49 AM EDT, Arv Evans <arvid.evans@...> wrote:


Jack

My comment was more about being familiar with binary progression than about
actually writing code.    8-)

Guess I'm showing my age if I admit that my first computer was a sales sample
8008 from Intel and it did boot to a paper-tape drive by entering the boot sequence
with toggle switches.  We have come a long way since then.

Arv
_._


On Sat, Aug 25, 2018 at 9:25 AM jjpurdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
Arv:

Why machine code? Why not use C?

Jack, W8TEE

On Saturday, August 25, 2018, 11:22:29 AM EDT, Arv Evans <arvid.evans@...> wrote:


Bill

My own QRP ATU uses binary progression of inductances with a 0-150 pf
variable cap and a switch for adding another 150 pf fixed C.  It doesn't seem
to be too much of a stretch to have the C values also binary progression. 
Might take a bit of thought for those not used to programming in machine
code but it does seem doable. 

I'm curious about how small latching relays work.  My only experience in
that area is with much larger units.  They had two coils, one to operate the relay
and another to release the lock.  Do the small ones work that way. or is
there some other methodology?  Magnetic latch?

Arv
_._


On Fri, Aug 24, 2018 at 8:17 PM J68HZ <bill@...> wrote:

Woah, wait.  Toggle switches to replace the relays???!!!!  So how do you propose that would work… do a binary search towards a low SWR solution?  That reminds me of loading the operating system into an ATARI 8080 system using front panel switches…  could take forever and a few days.  If you are worried about current draw, go with latching relays.  Back in March, I bought several hundred latching relays for $0.89 each… yes they can be had cheap if you buy them right from the source.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Arv Evans
Sent: Friday, August 24, 2018 8:18 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QSX radio feature requests

 

Glen

The K3NG ATU is an interesting design but uses several relays.  That is fine for automation

purposes, but I wonder if the design could be reproduced with a handful of DPDT rocker or

toggle switches replacing the relays.  Maybe there needs to be 2 versions of this well thought

out design, one that is automated and another that is manual for low current draw and increased

battery life for portable use.

Arv
_._

 

On Fri, Aug 24, 2018 at 6:27 PM Glenn <glennp@...> wrote:

The K3NG ATU lends itself to home brew.   And changes to the power level required. My own build I estimate at around 20-30W and uses smd 2-3kV caps (overkill) and the usual relay switching of L&C. Two relays are used to switch the ends for L-C or C-L. I used standard relays, not latching, due to cost here in VK. Control board uses a NANO with a 0.96" OLED display.

vk3pe


Virus-free. www.avg.com

Re: QSX radio feature requests

ajparent1/KB1GMX
 

Brady,

I found that some cases of high SWR on the output side the voltage on the
detector diodes killed them at 20W but not at below 15W.  For matching 3:1
or less it was not an issue.  Since most of their low power radios are 12W max
its rarely an issue.  Excellent match to my Argonaut 505 and FT817.

However, I've used it to tune end fed half waves, and 8ft whip at 20M and I
firmly believe its able to tune a nail at 40M or at least try.  Its quick about it.

As kits go it was a fun build.  Lots of toroids!

Allison

Re: QSX PA board

ajparent1/KB1GMX
 

Uli,

Why?  It will likely be better than some IRFxxx based
if only because its not run to -1db compression and 
it behaves well with high drain currents (100-300ma
bias per device) which is typical of most MOSFET amps.

Since its not a external power amp and part of the
radios power chain its hard to test standalone and have
valid results.  I'd like to test it but an exciter is not handy
at this point for two tone testing (is is an exciter
dependent number).

Allison

Re: Winding QCX T1 #qcx #t1

ajparent1/KB1GMX
 

Over the years I've used a very hot iron and solder. 

Then i got a very small solder pot (about 1" wide and maybe 1" deep)
and its fast and effective when I need to strip a lot of enameled wire. 
Little rosin on the lead and dip it. Down side for the pot is about
10 minute warm up.

I have to try the hot air solder/desolder tool.

The other tool using two small drums (.5") of material like rubber with
abrasive embedded turned with a small motor.  It rotates so that the
wire is pulled in and does a fine job as you pull it out.  Really simple
and very effective.

I try to not scrape or sand as that usually weakens the wire.

Allison

Re: QSX radio feature requests

Richard Harris
 

Whilst on the subject of auto-ATUs.....

I've made a home brew auto-ATU for my 20m QCX.  It uses three binary stepped toroid inductors and three binary stepped NPO ceramic capacitors and it has a seventh relay to switch between CL and LC matching, so similar to the Elecraft KAXT1.  The processor is a PICAXE 28X2 - the PICAXE is a PIC with a "PICAXE basic" interpreter and so is slower than an Arduino but plenty fast enough for this application.  The PICAXE is also very easy to program and most of my projects have at least one.

I was concerned about damage to the PA FETs because the impedance seen by the FETs could vary over a wide range when tuning, so rather than a conventional SWR bridge (such the Bruene circuit used in the T1) an eighth relay switches in a 50 Ohm resistive bridge when tuning is taking place and so the SWR seen by the TX never exceeds 2:1.  The processor grounds the QCX keyer dot contact and the relays change during dot spaces and the bridge balance is checked during each transmitted dot.  

There are a total of 128 combinations of Ls and Cs and the processor works its way through these combinations until the bridge approaches balance and then it varies the L and C plus and minus a setting or two to find the optimum the balance.  It takes a few seconds to find a match depending on the keyer speed that has been set.

I don't have a permanent outdoor antenna but the 20m QCX + auto-ATU works well with about 25 feet of wire hung around my ground floor shack and I have worked across the Atlantic with this combination. 

The Elecraft KAXT1 uses 5V latching relays - a very neat design.  My auto-ATU uses inexpensive 12V relays because minimizing current consumption wasn't a requirement.

Richard G3OTK

Re: Receiving on harmonics of Receiver LO?

erik@...
 

Did some measurements on receiving on harmonics of the LO
It seems the receiver is rather sensitive on harmonics of the LO. More like between -3dB and -6dB on first harmonic instead of -9dB
I also measured what the receiver does on harmonics of the antenna signal. Testing with a rather clean sinus input there is a signal at 3rd harmonic at about -35dB. Mirror rejection completely fails on these harmonics. Still need to verify if the input sinus is clean enough

If all these measurements are correct (not sure) it is terribly clear why you need a good BPF with direct conversion


--
Erik@Home