Date   

Re: OT: PC Based Scope

Peter GM0EUL
 

I've got a Hantek 6022BE because it came up virtually unused on Ebay so I stuck a bid in and got it.  Its perfectly fine for hf troubleshooting and testing which is all I really do with a scope.  Its well made and nice looking too.

73

Peter GM0EUL

CWops 1899. FISTS 18888, SKCC 16307T, GQRP 15056


Re: groupe

Dave VA3NIE
 

Bienvenue
--
'73 Dave VA3NIE


Re: OT: PC Based Scope

 

I have and love my OWON VDS-1022I. THe I means it has an optoisolator to the USB port built in.

They have a four channel version and a higher frequency version one too, if you have the cash.

https://www.owon.com.hk/list_virtual_oscilloscopes

Julian N4JO.

On 6/25/2020 3:23 PM, Mike Besemer - WM4B wrote:

Greetings all,

Hopefully this isn’t too off-topic for this forum. 

I’ve got a good lab scope and several of the el-cheapo miniature scopes from China, but I’ve been wanting a PC-Based scope so I can capture images – and just because I want one.

Anyone got any suggestions?  Doesn’t need to be cosmic… 2-Channel, 25 MHz or better will do all I need it to do.

73,

Mike

WM4B


OT: PC Based Scope

Mike Besemer - WM4B
 

Greetings all,

Hopefully this isn’t too off-topic for this forum. 

I’ve got a good lab scope and several of the el-cheapo miniature scopes from China, but I’ve been wanting a PC-Based scope so I can capture images – and just because I want one.

Anyone got any suggestions?  Doesn’t need to be cosmic… 2-Channel, 25 MHz or better will do all I need it to do.

73,

Mike

WM4B


Re: Waiting patiently for QCX+ :)

Mike Besemer - WM4B
 

I spiral-bound mine… with nice clear plastic covers.

 

Yeah.. I’m OCD like that.

 

Got notice today that mine is on the way!

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Ricky
Sent: Thursday, June 25, 2020 2:46 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] Waiting patiently for QCX+ :)

 

Well that's all 184 pages all printed on nice Matt photo paper.
Hope I don't get called back to work before it arrives 🤞


Waiting patiently for QCX+ :)

Ricky
 

Well that's all 184 pages all printed on nice Matt photo paper.
Hope I don't get called back to work before it arrives 🤞


Re: PA 10 W

H.-W. Höfermann
 

The 10W-PA actually IS the QSX-PA, pre-released in 2018
73
Hannes, DL4AAJ
Am 25.06.2020 um 20:35 schrieb Julian Opificius:
QSX? That will have a 10 watt output natively, per the spec, and won't
have any need for a 10W linear PA.

Julian, N4JO.

On 6/25/2020 1:26 PM, Jens Groh wrote:
It's all mathematical so far, Bernard, I haven't built one yet. :-)
Will do when QSX is there.

Am 25.06.2020 um 19:18 schrieb bernard BREYNE <f1ieo59250@...>:

Thank you very much Jens for the information. Did you encounter any
particular difficulties during the construction of the PA? Thank
you. Bernard.


--
Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft.
https://www.avast.com/antivirus


Re: PA 10 W

 

QSX? That will have a 10 watt output natively, per the spec, and won't have any need for a 10W linear PA.

Julian, N4JO.

On 6/25/2020 1:26 PM, Jens Groh wrote:
It's all mathematical so far, Bernard, I haven't built one yet. :-) Will do when QSX is there.

Am 25.06.2020 um 19:18 schrieb bernard BREYNE <f1ieo59250@...>:

Thank you very much Jens for the information. Did you encounter any particular difficulties during the construction of the PA? Thank you. Bernard.


Re: PA 10 W

Jens Groh
 

It's all mathematical so far, Bernard, I haven't built one yet. :-) Will do when QSX is there.

Am 25.06.2020 um 19:18 schrieb bernard BREYNE <f1ieo59250@...>:

Thank you very much Jens for the information. Did you encounter any particular difficulties during the construction of the PA? Thank you. Bernard.


Re: PA 10 W

bernard BREYNE
 

Thank you very much, it's actually a very good idea to use a a tenuator to respect the impedance of 50 Ohm.73 dear friend.

Le jeu. 25 juin 2020 à 19:23, Shirley Dulcey KE1L <mark@...> a écrit :
When you connect something to the 10W amp to drive it, you want to make sure that the driver device sees a nice friendly 50 ohm load. One way to do that is to use a bit of attenuation between them; 3dB or 6dB works well. That does increase the drive requirement to 50mW or 100mW. I have used one along with a Softrock RXTX, using 6dB of attenuation plus reduced drive to the Softrock to get the desired 10W out.

On Thu, Jun 25, 2020 at 1:19 PM bernard BREYNE <f1ieo59250@...> wrote:
Thank you very much Jens for the information. Did you encounter any particular difficulties during the construction of the PA? Thank you. Bernard.

Le jeu. 25 juin 2020 à 19:09, Jens Groh <jens.alt01@...> a écrit :
Bonjour Bernard,

other group members helped me with the same question, so today it's my turn:

10W, minus 26dB –> 25mW

Best wishes
Jens

Am 25.06.2020 um 19:00 schrieb bernard BREYNE <f1ieo59250@...>:

Hello everyone, can someone tell me what level of power should one inject at the entrance of the PA 10W to actually come out 10w? thank you in advance for the intelligence. 73 QRO


Re: PA 10 W

Shirley Dulcey KE1L
 

When you connect something to the 10W amp to drive it, you want to make sure that the driver device sees a nice friendly 50 ohm load. One way to do that is to use a bit of attenuation between them; 3dB or 6dB works well. That does increase the drive requirement to 50mW or 100mW. I have used one along with a Softrock RXTX, using 6dB of attenuation plus reduced drive to the Softrock to get the desired 10W out.


On Thu, Jun 25, 2020 at 1:19 PM bernard BREYNE <f1ieo59250@...> wrote:
Thank you very much Jens for the information. Did you encounter any particular difficulties during the construction of the PA? Thank you. Bernard.

Le jeu. 25 juin 2020 à 19:09, Jens Groh <jens.alt01@...> a écrit :
Bonjour Bernard,

other group members helped me with the same question, so today it's my turn:

10W, minus 26dB –> 25mW

Best wishes
Jens

Am 25.06.2020 um 19:00 schrieb bernard BREYNE <f1ieo59250@...>:

Hello everyone, can someone tell me what level of power should one inject at the entrance of the PA 10W to actually come out 10w? thank you in advance for the intelligence. 73 QRO


Re: PA 10 W

bernard BREYNE
 

Thank you very much Jens for the information. Did you encounter any particular difficulties during the construction of the PA? Thank you. Bernard.

Le jeu. 25 juin 2020 à 19:09, Jens Groh <jens.alt01@...> a écrit :
Bonjour Bernard,

other group members helped me with the same question, so today it's my turn:

10W, minus 26dB –> 25mW

Best wishes
Jens

Am 25.06.2020 um 19:00 schrieb bernard BREYNE <f1ieo59250@...>:

Hello everyone, can someone tell me what level of power should one inject at the entrance of the PA 10W to actually come out 10w? thank you in advance for the intelligence. 73 QRO


Re: PA 10 W

Jens Groh
 

Bonjour Bernard,

other group members helped me with the same question, so today it's my turn:

10W, minus 26dB –> 25mW

Best wishes
Jens

Am 25.06.2020 um 19:00 schrieb bernard BREYNE <f1ieo59250@...>:

Hello everyone, can someone tell me what level of power should one inject at the entrance of the PA 10W to actually come out 10w? thank you in advance for the intelligence. 73 QRO


PA 10 W

bernard BREYNE
 

Hello everyone, can someone tell me what level of power should one inject at the entrance of the PA 10W to actually come out 10w? thank you in advance for the intelligence. 73 QRO


groupe

bernard BREYNE
 

Merci beaucoup de m'avoir accepté dans le groupe. Je construit beaucoup et je viens d'acheter le PA10 W + les filtres de bandes. 73 QRO 


Re: U3S output ( single band unit versus LPF board unit )

Vernon Matheson
 

Hi Cathal...

I am comparing a sigle band U3S with 5 watt PA kit and a multiband U3S with a 5 watt PA kit

Doing the comparison i used the same 10M LPF  as well as the same 5 watt PA kit for testing each setup.

In the single band the LPF is in slot zero and in the multiband in slot 1 as that is where the LPF with the highest frequency is supposed to be installed on the LPF board.

Each U3S uses the 25 turn T1

The 5 watt PA is between the U3S and LPF in both cases.

It's not a big deal but just made me wonder why.

I haven't checked current draw yet.

Vernon


Re: U3s surprise #40m #wspr

David R. Hassall WA5DJJ
 

Dear Jakob,
I have a documented 1uW contact on QRSS for 1,164 miles between me and W4HBK in Pensacola, Florida back on May 17, 2014.   QRSS and other weak signal modes do travel much farther than we ever imagined.   The total test between WA5DJJ and W4HBK is documented on my website at: http://www.zianet.com/dhassall/BILLIONMPW.html It was a team effort between Bill W4HBK and I and I have not seen anything since to top it.   I doubt that it can be done on WSPR but that is an assumption made without testing the theory.   Propagation is astonishing sometimes and a lot of it's actions we take for granted. 
Take care and have fun. Try some QRSS with that U3S between those WSPR Transmissions and be prepared to be amazed again at where your signal goes.
73/74 Dave WA5DJJ
ALL BAND QRSS SUPER GRABBER http://www.qsl.net/wa5djj/


Re: U3s surprise #40m #wspr

BrianB
 

Jacob,

I’m not surprised at your success.

A while back a number of us participated in the “Under 1mW Challenge” which was a totally informal fun event. My U3S here in California was heard all over the US, Canada, Australia, and China.

73,
BrianB 


Re: U3S output ( single band unit versus LPF board unit )

Cathal Ferris
 

Hi Vernon,

Just to clarify.

You have one U3S kit, built with the LPF relay board, and with the PA unit inline between the U3S and the LPF, and another U3s kit built as a single band but also using a PA?
That you see an output power difference between the two kits, multiband kit with the 10m filter in slot 1 and the single band kit?

Or are you comparing the same U2s kit with and without the LPF in place? If so, are you correctly putting the PA between the U3S and the LPF relay board? If not, do you have the appropriate LPF between the PA and the antenna?

Are you using the same physical 10m LPF filter to do the comparison?
Is there a difference in the power draw by the U3S between the two configurations?

If it's a comparison between a single band U3s and a multiband U3s, it could entirely be down to construction and component differences between the kits. 

Always fun trying to troubleshoot things like this, but a better understanding of the current setup is needed.

-Cathal.


Re: #qcx+ Final manual version

Hans Summers
 

Hi Jelle, Warren

I changed the Palm Radio link to http://palm-radio.de/ which works, as you say; this way if Palm do anything with the website then the link will still be useful. 

Just noticed: Page 155. R36 is missing from diagram. C21 is in the 5.7 CW filter section. But R36 is mentioned in the text of section 5.8 but not shown in that sections diagram.

Yes but it does say: "This potentiometer is located on the front panel PCB and is not shown on this diagram section (below)."

Life is further mixed up because R36 is now the new RX signal 10K pull-up resistor. And on the front panel PCB, the gain control potentiometer is referred to as R1... but R1 is a fixed (10K) resistor on the main PCB. So there is a bit of a mix-up here, in nomenclature only, which I will need to resolve in a future PCB revision perhaps. But it is a minor problem, nothing is really unclear. 

The mix-up came about because for the last 10 years I have been using the free version of Eagle, it is limited to one page and a PCB area of 80 sq cm, among other limitations. The QCX just fit into that, so do all other QRP Labs kits, until QCX+. In QCX+ the main PCB breaks the 80 sq cm limit. So I paid for the annual fee of Eagle now. Which means I can have larger PCBs, so I could design QCX+; and multiple sheets. But I actually didn't use the multiple sheet feature, I have two separate projects, one for the front panel board and one for the main board; that means that component numbering between the two isn't maintained by the program; so when I removed the 5K pot to put it on the front panel board, and then added the 10K RX pullup resistor, the program allocated the first available resistor number, which was R36. And on the front board, it became R1. Arrghhhh.... anyway as I said... very small thing. 

The best way to manage this would be each board has component numbering starting at 100, 200 etc. I did this correctly with the TCXO module PCB, which has two capacitors called C101 and C102. 

Anyway - I amended the manual to make sure R36 (10K) is mentioned in the parts list; and the 5K pot is now referred to as R1 (Front panel) in the parts list. 

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