Date   
Re: U3S No output.

wes377@...
 

Alan... My TS590 is about a foot away from the U3S unit and I’m not hearing any leakage at all. I’m not sure how that is possible. should be loud in the transceiver?. Could it be my voltage converter 12v to 5v I bought a few on EBay? 

Wes
VA3RYV
   

Re: Improvement for 40m BPF for the U3s

Christoph Schwärzler
 

Another jig for those LPFs and BPFs built here. Optimizing for S21 while checking on impedance (S11) just  becomes so much fun with the NanoVNA. Especially if you use it together with a PC running NanoVNA saver.

The adapter was made using a single sided copper PCB and employing the toner transfer method. I attach a few pics for your info and the .svg file in case you want to build one, too. Import in a graphics program (e.g. Inkscape) and print. Solder SMA females to the PCB and headers to plug the LPF/BPF into.

Vy 73,
Chris OE1CGS

Re: U3S No output.

wes377@...
 

Not updated...I’m going to try and listen again like you said +-  @20 MHz  LCD works perfectly  
there must be leakage. I’ll report back here .

Wes

Re: U3S No output.

Alan G4ZFQ
 

On 01/12/2019 16:55, wes377@... wrote:
As said above ... Not hearing the crystals using my transceiver . Dead silence. No dry joints.
Wes
If nothing else the 20MHz MUST be working, (+/- several KHz) the processor relies on it. Unless the appropriate fuse is wrong. But you have not updated it have you?

73 Alan G4ZFQ

Re: U3S No output.

wes377@...
 

As said above ... Not hearing the crystals using my transceiver . Dead silence. No dry joints.

Wes

Re: U3S No output.

wes377@...
 

The unit programmed perfectly no errors at except at setup with call sign/locator Ect.....
   I’ve gone through the menu system many times thinking I missed something.
    I have no frequency counter but my transceiver should be enough.  Been using the Rev.3/4 build instructions. It must be something simple but I’m not sure where to look. I should be getting leakage absolutely.

Wes
VA3RYV

Re: U3S No output.

M0RON
 

How are you measuring output, wattmeter?
if so it may be that the enamel on the filter toroids or the u3s toroid hasn't been stripped properly. Check with a meter. 
If Q1 gets hot but cools down if bias is backed off Q1 should be ok, set it according to manual. 
You should be able to hear the crystal though. What are you using as a power source? All power input pins wired correctly? Random thought, is the synth inserted the correct way round? 
u3s is quite robust, probably a dry joint somewhere. 
Andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.

QCX/QSX Elmering and Discussion

Ed Kwik
 

Hi Everyone!
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Please join us Monday Dec 2, 2019 7:00 PM Eastern Time / Dec 3, 00:00 UTC for our next QRP Labs QCX/QSX transceiver Chat where the main topics will be the QRP Labs QCX single band CW transceiver and the soon to be released QSX multiband CW/SSB transceiver. It's fun, it's easy, and it's free. You only need a computer, a smart phone, or a tablet that can connect to the Internet. OR if you can't be close to any of those you can join by audio with any standard phone. Just follow the directions below.

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Re: Improvement for 40m BPF for the U3s

ajparent1/KB1GMX
 

Testing is best done as S21 (through).  For that do both OSL and
ISO -Through cal.

Testing using S11 is what I'd call the hard way as you have a nanoVNA.
I used that approach when all l had was a MFJ259B, but that was much
more difficult.

Also if the tuning produced a very double humped peak with more than
2DB dip in the middle the filter is either over coupled or its built different
than spec even 1 more turn on the larger winding or one less on the
smaller could be a factor depending on band.

Allison
--
Please reply on list so we can share.
Off list email goes to trash, I had to due to scrapers.

Re: U3S No output.

Alan G4ZFQ
 

Shouldn’t I be hearing the 20mhz crystal or the 27mhz crystal on the transiever?
Wes

Yes, and you should at least hear the output on your RX even if there is no PA and just leakage from the Si5351.
Does the display work, show no errors?

73 Alan G4ZFQ

Re: #qcx40 #problem no audio #qcx40 #problem

john.rogers@...
 

#resolved
Thanks Jim.
I found the volume control potentiometer was bad--wiper not connected internally.
Not exactly what you were thinking, but thanks to your clue the pot resistance was the first thing I checked.

I replaced the pot with a 10K linear that I had on hand--(replacing a 5k Log). It seems to work just as well

Hope to say hello on the air some day.

Cheers,
John
AC2SG

Re: U3S No output.

wes377@...
 

Shouldn’t I be hearing the 20mhz crystal or the 27mhz crystal on the transiever?

Wes

Re: U3S No output.

wes377@...
 

Yes tried tuning around to find it. Dead quiet
and yes PA is jumpered to 5+ volts. I’m thinking a faulty Q1 although it does get hot if I go to far clockwise on the trimmer so I backed it off where it just gets warm. Possibly the enamel on one of the bifilar T1 leads maybe although I did clean them well.

Wes

Re: U3S No output.

KEN G4APB
 

Wes,
try tuning around on your Rx. Until the CAL on the U3S shows it on freq (assuming your GPS is set to do this), it could be a couple of khz off the displayed frequency.

ken g4apb 

Re: U3S No output.

Roger Hill
 

Did you remember to jumper the 5 volt line to the PA positive?

Roger
G3YTN

On 1 Dec 2019, at 15:35, wes377@... wrote:
All the links are in according The the hardware options.... just a single LPF for now

Wes

Re: U3S No output.

wes377@...
 

All the links are in according The the hardware options.... just a single LPF for now

Wes

Re: Strange chip upgrade problem #avr

Roger G4IUP
 

Hello Alan.
Well I seem to recall I did tell Avrdudess to ignore and proceed but nothing happened. The initial readback was something odd like a string of zeroes. It works fine as T1.01a though. Still have it so will try again sometime. By the way I have learned an awful lot from your posts which are greatly appreciated!
73 Roger G4IUP

Re: U3S No output.

wes377@...
 

Yes ..... zero output.
   This is gonna be hard to explain I can tell.
its set for WSPR.
    I hear nothing on the WSPR frequency according to the LPF I’ve built. As I’ve built 6 LPFs.
   Yes I’m trying to hear it in my TS590 which next to the U3S about 6 inches away lol!!!. I’m using Slot 0 only. No relay switch kit.
 Just the U3S.

Wes

Re: Strange chip upgrade problem #avr

N3MNT
 

Did you try "detect chip" in the software app?

Re: Strange chip upgrade problem #avr

Alan G4ZFQ
 

That is strange as I have exactly the same problem with an old T1.01a chip.
Roger,

I can't say why but as Buddy knows it IS the right chip then the programming software should be told to ignore the lack of recognition.
This seems to happen occasionally, it's happened to me.

73 Alan G4ZFQ