Date   
Re: U3S + 5 watt PA troubleshooting help needed.

Liam Kingsmill <lumetters1@...>
 

Alan, you asked about frequency.  The U3S is feeding a 40 meter antenna with 7.040.005 MHz

The little SW receiver WAS swamped 15 feet away from the U3S when the U3S was working and getting "spotted" in Brazil and Seattle.  Now swamped only if less than a foot away.

The PicoScope is set up this morning.  Plan is to measure U3S RF output and to explore the U3S.  And, likely order a replacement BS170 (or two) from DigiKey.

And if Mr. Summers pointed to a U3S schematic with voltages, life would be just marvelous, here.

Liam

Re: USB soundcard w/stereo mic #rcvr

James Daldry W4JED
 

Hi, Skip

Probably because most "PC" users are using laptops, which have only 1 sound input, which, in many cases, is mono. A laptop "doing" email, as I am right now, uses anywhere from a quarter to a tenth of the energy used by the monitor attached to your PC, not even mentioning the hundreds of watts the PC itself uses. Unless you MUST have that extra 2 frames per second in that first person shooter, or make your living transcoding video you don't need a tower. This laptop is a quad core all-Intel Lenovo that I bought 7 years ago, and will still comfortably run any operating system available for PC's. By the way, it uses 10 watts with Firefox or Thunderbird open, and 1 watt with the lid closed, on standby. Takes roughly 2 seconds to return from standby and fetch new emails. 2 seconds to power off, and 18 seconds to boot. Oh, by the way, I'm running Linux Mint. With Compiz and all effects turned on. Runs Windows 7 nicely in a VM.

Jim W4JED

On 8/28/19 5:36 PM, SkipF, NT1G wrote:
Why not use 'LINE-IN'? That's 'stereo'.
73 de NT1G

On Wed, Aug 28, 2019, 5:34 PM Jean-Marie Polard <contact@...> wrote:

Hello, new in the group, I am happy to know each of you and will try to be as helpful as possible

I use UMC202HD stereo usb soundcard, and I have a usr file to work with it on spectrum lab.

I recommend it !

Best 73's

JOHN F5VLB Brittany, France


Le 28/08/2019 à 22:20, Kārlis Goba a écrit :
I faced pretty much the same issue recently and ended up getting a Behringer UCA222 USB sound card. Works nicely.

--
Karlis YL3JG
-- 
Jean-Marie Polard
F5VLB
email : contact@...
tél : 06.21.91.62.50

Re: Straight Key problem

N3MNT
 

How are you doing this conversion?  " If I convert the mono plug to a stereo plug".  If you are using an adapter that may be your problem.  Wire it directly to a stereo plug as Peter ^^^^^^ said.

Re: U3S + 5 watt PA troubleshooting help needed.

Alan G4ZFQ
 

not wanting to bust the U3S PA stage (as Hans Summers describes) by setting the bias too high.
Liam,

I'm not familiar with driving the amplifier but Hans describes the bias setting for the U3 in detail. I use the "just detectable " current increase method.

How does one test a transistor, other than by substitution?
If the bias control works then it points to correct operation but substitution is the easiest way.

7.040 MHz RF is picked up within a foot of the U3S during a WSPR
transmission

I do not think you have mentioned the frequency, it is 40m? If the BS170 is working I would expect a receiver to be swamped even at a distance.

73 Alan G4ZFQ

Re: USB soundcard w/stereo mic #rcvr

Alan G4ZFQ
 

Can someone recommend a cheap USB sound card that will fill the bill and let me decode I Q signals?
Mike,

As others have said it is not easy to be sure of a stereo input.
Many cheap ones described as "stereo" only refer to the output.
With cheap ones even ones that look identical may not be the same.
Look for one that definitely says stereo input. Then make sure you can get a refund if it is not.
The Xonar U3 is not exactly cheap but is a reasonable USB device.
Many laptops do have a stereo input. They are often configured for a mono mike but if you dig into the sound settings there might be the ability to set it to stereo with a half-decent stereo system.
This is for an older Asus https://sites.google.com/site/g4zfqradio/sdronasus A few older ones listed here https://sites.google.com/site/g4zfqradio/connecting-soundcard-sdr-to-computer#LAPTOPS

73 Alan G4ZFQ

Re: Straight Key problem

Peter GM0EUL
 

Hi Curt
The socket works fine with a straight key, you don't have to connect it to the little micro switch key.   What happens if you set it to straight key and plug in your code warrior?  Each paddle should then act as a straight key and give a continuous tone.  If that happens then basically everything is fine.  For the real straight key use a stereo plug with one lead on the tip and the other on either the ring or the body but don't bridge them.

Hope this helps, let me know if you manage to sort it out.

73
Peter GM0EUL

Straight Key problem

Curt Gidding
 

When I set the QCX with Straight Key in menu and plus a straight with a mono plug into the paddle jack, I get a group of solid dashes.  If I convert the mono plug to a stereo plug I get the same thing. The small straight key works OK.  To use an outboard straight key will I have to wire one in where the small one. The paddle jack works OK with a Vibroplex Code warrior.
Thanks for your replies.   KC9UL

Re: USB soundcard w/stereo mic #rcvr

Shirley Dulcey KE1L
 

Most desktop computers have a Line In jack. That's the right choice
for connecting your I/Q outputs if you have one.

Laptop computers rarely have Line In. They only have Microphone In,
which is mono on most laptops. The newest ones have a combined
microphone/headphone jack like the ones that phones used to have;
those are always mono. You will need some other form of audio input,
most commonly a USB sound card, to do I/Q audio on a laptop.

On Wed, Aug 28, 2019 at 5:36 PM SkipF, NT1G <@SkipF> wrote:

Why not use 'LINE-IN'? That's 'stereo'.
73 de NT1G

On Wed, Aug 28, 2019, 5:34 PM Jean-Marie Polard <contact@...> wrote:

Hello, new in the group, I am happy to know each of you and will try to be as helpful as possible

I use UMC202HD stereo usb soundcard, and I have a usr file to work with it on spectrum lab.

I recommend it !

Best 73's

JOHN F5VLB Brittany, France


Le 28/08/2019 à 22:20, Kārlis Goba a écrit :

I faced pretty much the same issue recently and ended up getting a Behringer UCA222 USB sound card. Works nicely.

--
Karlis YL3JG

--
Jean-Marie Polard
F5VLB
email : contact@...
tél : 06.21.91.62.50

Re: USB soundcard w/stereo mic #rcvr

Bruce K1FFX
 

I also use the Behringer UCA202.  I already had one as part of my home studio, tried out with the QRP Labs receiver module, it worked great ... so I bought a second dedicated to ham shack use.  Whereas I always had trouble with Window 7's sound input/output using the jack's on my Dell laptop, never have had an issue using the Behringer (USB sound card).

Cheers -

Bruce K1FFX

Re: New member

Ron Yates <yatesvilleron@...>
 

Hey Brian, fine business you are involved in…

 

My direct PM is yatesvilleron@....  I am checking with my primary HAM Club W4BFB in Charlotte to see what they might have done in the past in this regard. 

 

73, Ron Yates

 

From: QRPLabs@groups.io <QRPLabs@groups.io> On Behalf Of B C
Sent: Wednesday, August 28, 2019 7:25 PM
To: 'QRPLabs@groups.io' <QRPLabs@groups.io>
Subject: Re: [QRPLabs] New member

 


Hi Ron,

I too am just starting to explore High Altitude Ballooning. I work at the Horwitz DeRemer Planetarium in Waukesha, Wi and we are planning a launch next summer to supplement a summer at-home study program where kids can track the balloon online from home, decode telemetery, study weather, and geography and maybe promote ham radio at the same time. 

 

Lots to learn..technology, regulations..I am planning some lower tech tests or ground base tests to figure out how everything goes together.  Let's share..

 

Brian K9WIS

 

-----------------------------------------

From: "Ron Yates"
To: QRPLabs@groups.io
Cc:
Sent: Wednesday August 28 2019 5:54:06PM
Subject: [QRPLabs] New member


Hi All, I don’t bring any technical skills or experience with me.  But I do have a recurring interest in Amateur Radio High Altitude Ballooning so I am in learning mode.  I am also a new Amateur Radio operator this year.  I will stay out of the way and you can know you have one more admirer cheering on your work.

 

Ron Yates AE4RY

Re: USB soundcard w/stereo mic #rcvr

K9WIS
 

I picked up a USB sound dongle on EBAY that was stereo and had 4 additional USB ports to run my my CAT and PTT signals. It was really cheap..Around $10. I can run my whole station off  one USB port on my computer.

Brian K9WIS

-----------------------------------------

From: "Mike Berg"
To: QRPLabs@groups.io
Cc:
Sent: Wednesday August 28 2019 2:33:18PM
Subject: [QRPLabs] USB soundcard w/stereo mic #rcvr

I'm building the Tayloe receiver kit and I doubt my motherboard sound systems have stereo mic inputs.

I'm pretty sure my Signalink USB is mono in as well.

Can someone recommend a cheap USB sound card that will fill the bill and let me decode I Q signals?
73
Mike N0QBH

Re: New member

K9WIS
 


Hi Ron,
I too am just starting to explore High Altitude Ballooning. I work at the Horwitz DeRemer Planetarium in Waukesha, Wi and we are planning a launch next summer to supplement a summer at-home study program where kids can track the balloon online from home, decode telemetery, study weather, and geography and maybe promote ham radio at the same time. 

Lots to learn..technology, regulations..I am planning some lower tech tests or ground base tests to figure out how everything goes together.  Let's share..

Brian K9WIS

-----------------------------------------

From: "Ron Yates"
To: QRPLabs@groups.io
Cc:
Sent: Wednesday August 28 2019 5:54:06PM
Subject: [QRPLabs] New member

Hi All, I don’t bring any technical skills or experience with me.  But I do have a recurring interest in Amateur Radio High Altitude Ballooning so I am in learning mode.  I am also a new Amateur Radio operator this year.  I will stay out of the way and you can know you have one more admirer cheering on your work.

 

Ron Yates AE4RY

Re: New member

Ross Henderson
 

Hey Ron: Welcome to the zoo and good luck in your new hobby.


On Wednesday, August 28, 2019, 4:57:49 PM CDT, Ron Yates <yatesvilleron@...> wrote:


Hi All, I don’t bring any technical skills or experience with me.  But I do have a recurring interest in Amateur Radio High Altitude Ballooning so I am in learning mode.  I am also a new Amateur Radio operator this year.  I will stay out of the way and you can know you have one more admirer cheering on your work.

 

Ron Yates AE4RY

Re: USB soundcard w/stereo mic #rcvr

Mike Berg
 

"Why not use 'LINE-IN'? That's 'stereo'.
73 de NT1G"

That's too simple - assuming it works :)
How are the others using this receiver kit decoding?
73
Mike  N0QBH

Re: U3S + 5 watt PA troubleshooting help needed.

Liam Kingsmill <lumetters1@...>
 

A mention forgot:  7.040 MHz RF is picked up within a foot of the U3S during a WSPR transmission, but may be from a stage prior to the U3S PA.  Move the little SW radio a couple of feet from the U3S and the signal decreases greatly.

There's a PicoScope 2204A ten feet away, but without U3S troubleshooting instructions, I wouldn't know what's what.  I don't know how to troubleshoot anything with a transistor inside.

Liam

New member

Ron Yates <yatesvilleron@...>
 

Hi All, I don’t bring any technical skills or experience with me.  But I do have a recurring interest in Amateur Radio High Altitude Ballooning so I am in learning mode.  I am also a new Amateur Radio operator this year.  I will stay out of the way and you can know you have one more admirer cheering on your work.

 

Ron Yates AE4RY

Re: USB soundcard w/stereo mic #rcvr

SkipF, NT1G <skip.flem@...>
 

Why not use 'LINE-IN'? That's 'stereo'.
73 de NT1G

On Wed, Aug 28, 2019, 5:34 PM Jean-Marie Polard <contact@...> wrote:

Hello, new in the group, I am happy to know each of you and will try to be as helpful as possible

I use UMC202HD stereo usb soundcard, and I have a usr file to work with it on spectrum lab.

I recommend it !

Best 73's

JOHN F5VLB Brittany, France


Le 28/08/2019 à 22:20, Kārlis Goba a écrit :
I faced pretty much the same issue recently and ended up getting a Behringer UCA222 USB sound card. Works nicely.

--
Karlis YL3JG
-- 
Jean-Marie Polard
F5VLB
email : contact@...
tél : 06.21.91.62.50

Re: U3S + 5 watt PA troubleshooting help needed.

Liam Kingsmill <lumetters1@...>
 

Alan, here's update #3:    The GPS and U3S work well together.  However, not enough RF is produced when the U3S starts WSPR transmission.  Avg 120ma when in WSPR transmission or not transmitting.  I'm assuming the bias is not high enough to allow RF to flow.  I raised the bias. 

The next WSPR transmission dropped the supply current from the raised setting of 135ma (calibrate condition) to 120ma during WSPR transmission.  I'd expected the current to increase during WSPR transmission, not drop.

I don't recall the current during calibrate or WSPR transmission when the U3S transmitted WSPR and the RF output appeared to be normal.  Lots of "spots" reported back then.

Now,  I'm in "What the hell?"  mode, not wanting to bust the U3S PA stage (as Hans Summers describes) by setting the bias too high.  How does one test a transistor, other than by substitution?

Liam KI7UPZ

Re: USB soundcard w/stereo mic #rcvr

contact@...
 

Hello, new in the group, I am happy to know each of you and will try to be as helpful as possible

I use UMC202HD stereo usb soundcard, and I have a usr file to work with it on spectrum lab.

I recommend it !

Best 73's

JOHN F5VLB Brittany, France


Le 28/08/2019 à 22:20, Kārlis Goba a écrit :
I faced pretty much the same issue recently and ended up getting a Behringer UCA222 USB sound card. Works nicely.

--
Karlis YL3JG
-- 
Jean-Marie Polard
F5VLB
email : contact@...
tél : 06.21.91.62.50

Re: USB soundcard w/stereo mic #rcvr

Kārlis Goba
 

I faced pretty much the same issue recently and ended up getting a Behringer UCA222 USB sound card. Works nicely.

--
Karlis YL3JG