Date   

Re: 50 Watt PA Rev. 2

George Korper
 

Ron, assuming I have pin- out correct..

Gate:13.85
Drain .05
Source: 0000

Looking at board bottom with hole in Mosfet on the top, that is reading from right to left


On Mon, Jul 13, 2020 at 11:27 AM George Korper via groups.io <georgekorper=gmail.com@groups.io> wrote:
Thank you. Will check Q3. 
BTW I have never  seen 50 watts on 20. Maybe 30+  watts at 20 volts. 
All the output functions including transformers appear to be okay. 

On Mon, Jul 13, 2020 at 10:49 AM Ronald Taylor <wa7gil@...> wrote:
Hi George. Did you check if Q3 is functioning? On receive the gate of Q3 should be high and the drain should be low. 

Ron

On Mon, Jul 13, 2020 at 7:41 AM Ralf Rosche <ralf.rosche@...> wrote:
Hi George,
output ok means 50W+ ?
If so, the transformers should be correct direction, pease check this twice. 

And there is no short with the ferrit of the torroids in case the enamel of the wire could be damaged?
Check with ohmmeter must be somewhat above some MOhms.

May be one of the pin diode is faulty, or wrong direction?
They are responsible for RX/TX switching.
Hans had a nice description of the functionality in his manual. 

Ralf
 



Re: QCX+ Power

K2DB Paul Mackanos
 

Thank you Hans, just saved me some time !
Paul K2DB

On Mon, Jul 13, 2020 at 11:49 AM Hans Summers <hans.summers@...> wrote:
Hi Paul

The QCX+ already has built-in reverse polarity protection built-in via D3 (1N5819) just as QCX did. 

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

On Mon, Jul 13, 2020 at 6:18 PM K2DB Paul Mackanos <paul.mackanos@...> wrote:
When i got to step: 3.47 Install power connector. I decided not to solder it yet. I have made several mistakes over the years with Reverse Polarity. I decided to just Super glue the power connector in place, and deal with modifying the kit to implement the KC9ON Reverse Polarity Protection Kit available on www.KC9ON.com. I will most likely use shrink tubing on the connector to isolate the DC input and run wiring from the pins of the power connector to the reverse polarity protection kit and then back to the input pads for the power. I am glad I purchased the developmental board, most likely I will build this on the developmental board. I am attaching pictures to show what I am trying to explain.
I am having fun, and taking my time.
Paul K2DB  


Re: QCX+ Power

Hans Summers
 

Hi Paul

The QCX+ already has built-in reverse polarity protection built-in via D3 (1N5819) just as QCX did. 

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

On Mon, Jul 13, 2020 at 6:18 PM K2DB Paul Mackanos <paul.mackanos@...> wrote:
When i got to step: 3.47 Install power connector. I decided not to solder it yet. I have made several mistakes over the years with Reverse Polarity. I decided to just Super glue the power connector in place, and deal with modifying the kit to implement the KC9ON Reverse Polarity Protection Kit available on www.KC9ON.com. I will most likely use shrink tubing on the connector to isolate the DC input and run wiring from the pins of the power connector to the reverse polarity protection kit and then back to the input pads for the power. I am glad I purchased the developmental board, most likely I will build this on the developmental board. I am attaching pictures to show what I am trying to explain.
I am having fun, and taking my time.
Paul K2DB  


Re: #firmware #qcx40 #firmware #qcx40

 

Marek,

It is compatible - all versions are comptible - certainly for driving the display - it's just the behavior and features that differ. I upgraded one of mine from 1.00g all the way to 1.05.

Julina N4JO.

On 7/13/2020 9:01 AM, Marek SP9TKW wrote:
Is there any problem with pluging previous version (T 1.00g) microcontroller instead of current T 1.04 on Rev 5 board?

I purchased assembled version QCX for 20m band, which has issue with block top line. In order to narrow scope of diagnosis I wanted to test old microcontroller on fully working QCX for 40m band. All I want to check if the same problem apears or not. I do not plan calibration process just to see if message apears etc...

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


Re: 50 Watt PA Rev. 2

George Korper
 

Thank you. Will check Q3. 
BTW I have never  seen 50 watts on 20. Maybe 30+  watts at 20 volts. 
All the output functions including transformers appear to be okay. 

On Mon, Jul 13, 2020 at 10:49 AM Ronald Taylor <wa7gil@...> wrote:
Hi George. Did you check if Q3 is functioning? On receive the gate of Q3 should be high and the drain should be low. 

Ron

On Mon, Jul 13, 2020 at 7:41 AM Ralf Rosche <ralf.rosche@...> wrote:
Hi George,
output ok means 50W+ ?
If so, the transformers should be correct direction, pease check this twice. 

And there is no short with the ferrit of the torroids in case the enamel of the wire could be damaged?
Check with ohmmeter must be somewhat above some MOhms.

May be one of the pin diode is faulty, or wrong direction?
They are responsible for RX/TX switching.
Hans had a nice description of the functionality in his manual. 

Ralf
 



Re: KIT LPF

bernard BREYNE
 

Good evening, as already said, I have no filter door. I'd like to buy one. I'd like an email address to order it. Thank you.

Le lun. 13 juil. 2020 à 15:34, Bob Benedict, KD8CGH <rkayakr@...> a écrit :
Bernard
  Did you make a filter holder and calibrate at that holder? 
--
  73
    KD8CGH


QCX+ Power

K2DB Paul Mackanos
 

When i got to step: 3.47 Install power connector. I decided not to solder it yet. I have made several mistakes over the years with Reverse Polarity. I decided to just Super glue the power connector in place, and deal with modifying the kit to implement the KC9ON Reverse Polarity Protection Kit available on www.KC9ON.com. I will most likely use shrink tubing on the connector to isolate the DC input and run wiring from the pins of the power connector to the reverse polarity protection kit and then back to the input pads for the power. I am glad I purchased the developmental board, most likely I will build this on the developmental board. I am attaching pictures to show what I am trying to explain.
I am having fun, and taking my time.
Paul K2DB  


Re: 50 Watt PA Rev. 2

Ronald Taylor
 

Hi George. Did you check if Q3 is functioning? On receive the gate of Q3 should be high and the drain should be low. 

Ron

On Mon, Jul 13, 2020 at 7:41 AM Ralf Rosche <ralf.rosche@...> wrote:
Hi George,
output ok means 50W+ ?
If so, the transformers should be correct direction, pease check this twice. 

And there is no short with the ferrit of the torroids in case the enamel of the wire could be damaged?
Check with ohmmeter must be somewhat above some MOhms.

May be one of the pin diode is faulty, or wrong direction?
They are responsible for RX/TX switching.
Hans had a nice description of the functionality in his manual. 

Ralf
 



Re: 50 Watt PA Rev. 2

Ralf Rosche
 

Hi George,
output ok means 50W+ ?
If so, the transformers should be correct direction, pease check this twice. 

And there is no short with the ferrit of the torroids in case the enamel of the wire could be damaged?
Check with ohmmeter must be somewhat above some MOhms.

May be one of the pin diode is faulty, or wrong direction?
They are responsible for RX/TX switching.
Hans had a nice description of the functionality in his manual. 

Ralf
 



50 Watt PA Rev. 2

George Korper
 

Hi All,
I just assembled a 20 meter Amp and the output is ok.
The unit keys, red light turn on but the receive is very attenuated.
I replaced the two BS 170's, checked all the diodes, checked all the inductors.
I checked all the resistors, because they are from a different supplier. 
I cannot see any components are switched.

During assembly as I was soldering I heard a strange gurgling and pop as I was soldering
Q5 so I replaced it. 


This is my first rev. 2 kit with new parts in it, and my first problem lately with amps.
Has anyone just built a freshly arrived Amp kit?
Where do I look from here?

Again the Amp seems to be working but the receive is attenuated.

Thanks,
George


#firmware #qcx40 #firmware #qcx40

Marek SP9TKW
 

Is there any problem with pluging previous version (T 1.00g) microcontroller instead of current T 1.04 on Rev 5 board?

I purchased assembled version QCX for 20m band, which has issue with block top line. In order to narrow scope of diagnosis I wanted to test old microcontroller on fully working QCX for 40m band. All I want to check if the same problem apears or not. I do not plan calibration process just to see if message apears etc...

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


Re: KIT LPF

Bob Benedict, KD8CGH
 

Bernard
  Did you make a filter holder and calibrate at that holder? 
--
  73
    KD8CGH


Re: KIT LPF

bernard BREYNE
 

Bonjour cher OM , merci pour la réponse. Effectivement je me suis mal exprimé. Mes courbes de réponses me semble pas bonnes. Je vous envoie quelques photos. A moins que ne ne branche pas correctement le filtre ou que les paramètres du Nanovna ne sont pas bon ? seul le 80 m me semble correct.
Merci pour votre aide. 73 F1IEO


Re: KIT LPF

Bob Benedict, KD8CGH
 

Thanks - Nice!
I like having the calibration on the test fixture. That's much more convenient, and probably more consistent, than they way I calibrate my homemade fixture.
--
  73
    KD8CGH


QCX Audio AGC

Mike
 

I found the attached article on AGC while looking for ALC, typical finger
trouble here.. but it seems that the circuit may be worth a try with the QCX.
hth, Mike


Re: KIT LPF

bernard BREYNE
 

Hello thank you very much for the information. I would love to order a turntable to test the LPF filters like you. What address or email can I order this from? thank you F1IEO I do not understand well the previous order info.

Le lun. 13 juil. 2020 à 09:19, J P Watters via groups.io <kc9kko=mac.com@groups.io> a écrit :

I forgot to attach a photo to show how nicely it attaches to the NanoVNA.


Re: BPF too good? #filter

Adrian Scripcă
 

Hi all,

I also get a good IL of ~1dB when properly tuning the 40meter BPF version. I used a HP70000 series SA+TG combo for characterising; please find the plot attached.

All the best,
Adrian, YO6SSW


On Wed, Jul 8, 2020 at 11:28 PM ajparent1/KB1GMX <kb1gmx@...> wrote:


I really hate the on line editor as it has enough lag to get old versions.
(groups IO and net issue).

Seems there is a lot of mixing of LPF and BPF, they are not the same thing
and expected result is different.

For LPF loss should not exceed  .5Db in the pass band is expected and correct.
Its curve for S21 (through loss) should be mostly flat from some low frequency
though the band to the corner frequency and then a slope down to -50db
or greater.  Lumps or steps indicate wrong values or grounding issue as
well as lumps and steps in the region that is sloping should not be there.

For band pass the band width and loss will vary from band to band but
under 2db (s21) is nominal for the filters.  One must use a wide enough
sweep to insure all resonators are in the band pass and there are no
external peaks that would result in excess loss.   Note he position of
the input and output links should be the same relative to each other
and nearest to the cold (grounded) end of the inductor for both best
S11 and S21.  Reminer if measuring S11 the far end of the filter does
have to be terminated in the design resistance (50 ohms for these).

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting

 

 
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: KIT LPF

J P Watters <kc9kko@...>
 

I forgot to attach a photo to show how nicely it attaches to the NanoVNA.


Re: Test

Larry KA5T
 

Thank you :)
Larry
KA5T

On Jul 12, 2020, at 9:32 PM, Ryan Flowers <geocrasher@...> wrote:


Message Test Failure. Beep boop. I'm a computer. Whiirrrrrrr click click beep. Kerchunk. 

(Just kidding- your message came through fine!)


On Sun, Jul 12, 2020 at 7:10 PM Larry KA5T <ka5t@...> wrote:
Test




--
Ryan Flowers - W7RLF
MiscDotGeek - QRP and More


Re: KIT LPF

J P Watters <kc9kko@...>
 

Bernard and Bob,

I stumbled across a ham that created a circuit board that mates with the NanoVNA, I put male connectors on it an attached it directly to the NanoVNA.
No Cables, And easy to calibrate with the on board jumpers. 

https://www.ph2lb.nl/blog/index.php?page=for-sale-qrp-labs-filter-adapter-pcb-v2-for-nanovna-parts

Soldered 4 100 ohm SMD resistors, a couple of 4 position female headers and half a dozen 2 position male headers.

If you want to attached the adapter with cables, solder on a couple female SMA PCB coax edge connectors
or use male connectors to attach it directly to the NanoVNA.

After years of using calibrated open, shorts and loads for calibrating my VNA analyzer, I liked the idea of using
computer 2 position header shorting jumpers to do the calibration. Eliminates the cable swapping.
It makes it as almost as easy as some of the auto calibrate VNA's.

..jpw J P Watters
KC9KKO