Date   
Re: No output QCX 40 output drains show 1.6 watts in receive

George Korper
 

I understand with the voltage on the gate of the output transistor, it is consistent  with the output on the drain.
but is the IC3 bad? My electronics education is not deep enough to come up with it ( hi hi) Everything was working fine so at least I can rule out
bad soldering, but replacing the output transistors was stupid. I NOW HAVE LEARNED WHY YOU INSIST ON VOLTAGE MEASUREMENT FIRST. Thanks for being a good Elmer. 


On Tue, Dec 10, 2019 at 10:37 PM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
Alan,  I checked pin 3 again and it is still showing 5 volts. which I see shouldn't be 5 but zero.
The transmit voltages are not changed but the same as receive.


On Tue, Dec 10, 2019 at 5:30 PM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
I sent you receive voltages. Thanks for the link, I forgot to reread the trouble shooting section.
There was no change in voltages in transmit, so
I can see the 12 Volts is not on the pins in transmit.
In transmit nothing on the IC3 changes.


On Tue, Dec 10, 2019 at 4:59 PM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
IC3 Voltages LCD unplugged:
some values rounded off.
1) 5
2) 5
3) 5
4) .02
5) .01
6) 5
7) 0
8) 5
9) 0
10) 0
 11) 0
12) 5
13) 5
14) 5

On Tue, Dec 10, 2019 at 4:31 PM Alan G4ZFQ <alan4alan@...> wrote:
> I went ahead and replaced Q6. No change.

George,

Replacing things blindly may not work. It is not unusual for several
components to blow in the PA, replacing one component may blow it again.
Voltage readings are important. Also check voltages after you remove a
suspect but before you renew it.

> I will try to get voltages on IC3, but I didn't see the voltages listed
> in the list, are they somewhere else?

http://www.qrp-labs.com/qcx/qcxtrouble.html#transmit
> May I remove the LCD do get to to IC3 and still take the voltages?
Yes

> The QCX was running fine.......

Quite a story:-) Settle down do it slowly. Measure voltages, remove
anything suspect, measure voltages.. Report here.

73 Alan G4ZFQ



Re: No output QCX 40 output drains show 1.6 watts in receive

George Korper
 

Alan,  I checked pin 3 again and it is still showing 5 volts. which I see shouldn't be 5 but zero.
The transmit voltages are not changed but the same as receive.


On Tue, Dec 10, 2019 at 5:30 PM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
I sent you receive voltages. Thanks for the link, I forgot to reread the trouble shooting section.
There was no change in voltages in transmit, so
I can see the 12 Volts is not on the pins in transmit.
In transmit nothing on the IC3 changes.


On Tue, Dec 10, 2019 at 4:59 PM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
IC3 Voltages LCD unplugged:
some values rounded off.
1) 5
2) 5
3) 5
4) .02
5) .01
6) 5
7) 0
8) 5
9) 0
10) 0
 11) 0
12) 5
13) 5
14) 5

On Tue, Dec 10, 2019 at 4:31 PM Alan G4ZFQ <alan4alan@...> wrote:
> I went ahead and replaced Q6. No change.

George,

Replacing things blindly may not work. It is not unusual for several
components to blow in the PA, replacing one component may blow it again.
Voltage readings are important. Also check voltages after you remove a
suspect but before you renew it.

> I will try to get voltages on IC3, but I didn't see the voltages listed
> in the list, are they somewhere else?

http://www.qrp-labs.com/qcx/qcxtrouble.html#transmit
> May I remove the LCD do get to to IC3 and still take the voltages?
Yes

> The QCX was running fine.......

Quite a story:-) Settle down do it slowly. Measure voltages, remove
anything suspect, measure voltages.. Report here.

73 Alan G4ZFQ



Re: Setting up & alignment problems.

ajparent1/KB1GMX
 

If you have no audio thats the starting point.

First check to see that you have 5V at the regulator output.  Then does the display light and communicate.

The volume control due to location of other parts is tricky so make sure you
haven't shorted the terminals or not connected them!

turn the volume up some and with headphone plugged it can you hear any
hiss?   Touch a screw driver tip to the middle (wiper lead) of the volume
control hear a click or buzz?

WIth a  simple meter (digital or analog) measure voltages at 
IC 10 pin1 and IC9 pin 1 do they come close to the listed voltages in
the manual?

NOTE use the trouble shooting procedure in the manual.  Simple
problems can be hard to find if this (radio construction or electronics)
is all new to you.

Since you didn't solder in the SI5153 if its not doing its thing look at
what you did solder like the ATMEGA328P MPU socket.  

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

Re: Setting up & alignment problems.

Alan G4ZFQ
 

I am trying to Align i-Q balance, phase lo and phase high, I have no audio,
Albert,

Check all voltages as in the manual.

73 Alan G4ZFQ

Re: Setting up & alignment problems.

Dave Edwards
 

Albert....I was in your shoes EXACTLY last night.

I never made it to the phase lo and phase high, because the I-Q balance just showed 0...or perhaps it was 1, But, either way....did not have any effect when twiddling the trimmer cap.

From the little bit of panic reading I did, I was able to guess that I should first check the 3 clock signals. Do you have a scope?

I can help you with those, but another thing to check is to buzz out with an ohm meter each of the windings of that transformer....so the start of the 38 turn winding should show a short to its' end. And similarly, each of the 5 turn windings should show a short from start to end on the circuit board.

In my case, the second winding (5 turns) did not show a short from the two pads where it should be soldered.  Too small for me to tell what the heck was going on, so I yanked the transformer, and started it over this morning. Then, it worked....and I went through the rest of the alignment, and made a contact this morning!!

On 12/10/19 2:17 PM, g4oge@... wrote:
Hi, I've built a 40 meter version of the QCX, and I am trying to Align i-Q balance, phase lo and phase high, I have no audio, and the adjustment number (top right of display) is constantly 00 wherever the volume is, I have gone over the board and re-soldered and checked for solder jumps, I checked 2 pairs of phones but no sound, not sure where to start even, any advice appreciated. Albert

Setting up & alignment problems.

Albert Rowe
 

Hi, I've built a 40 meter version of the QCX, and I am trying to Align i-Q balance, phase lo and phase high, I have no audio, and the adjustment number (top right of display) is constantly 00 wherever the volume is, I have gone over the board and re-soldered and checked for solder jumps, I checked 2 pairs of phones but no sound, not sure where to start even, any advice appreciated. Albert

Re: No output QCX 40 output drains show 1.6 watts in receive

George Korper
 

I sent you receive voltages. Thanks for the link, I forgot to reread the trouble shooting section.
There was no change in voltages in transmit, so
I can see the 12 Volts is not on the pins in transmit.
In transmit nothing on the IC3 changes.


On Tue, Dec 10, 2019 at 4:59 PM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
IC3 Voltages LCD unplugged:
some values rounded off.
1) 5
2) 5
3) 5
4) .02
5) .01
6) 5
7) 0
8) 5
9) 0
10) 0
 11) 0
12) 5
13) 5
14) 5

On Tue, Dec 10, 2019 at 4:31 PM Alan G4ZFQ <alan4alan@...> wrote:
> I went ahead and replaced Q6. No change.

George,

Replacing things blindly may not work. It is not unusual for several
components to blow in the PA, replacing one component may blow it again.
Voltage readings are important. Also check voltages after you remove a
suspect but before you renew it.

> I will try to get voltages on IC3, but I didn't see the voltages listed
> in the list, are they somewhere else?

http://www.qrp-labs.com/qcx/qcxtrouble.html#transmit
> May I remove the LCD do get to to IC3 and still take the voltages?
Yes

> The QCX was running fine.......

Quite a story:-) Settle down do it slowly. Measure voltages, remove
anything suspect, measure voltages.. Report here.

73 Alan G4ZFQ



Re: QCX/QSX Elmering and Discussion

Ryan Flowers
 

If you have an antenna analyzer, you can sweep a filter and get a pretty good idea of its performance. 

I documented it here:

https://miscdotgeek.com/qrp-labs-band-pass-filter-tips/
--
Ryan Flowers - W7RLF
The BITX40 FAQ

Re: No output QCX 40 output drains show 1.6 watts in receive

George Korper
 

IC3 Voltages LCD unplugged:
some values rounded off.
1) 5
2) 5
3) 5
4) .02
5) .01
6) 5
7) 0
8) 5
9) 0
10) 0
 11) 0
12) 5
13) 5
14) 5

On Tue, Dec 10, 2019 at 4:31 PM Alan G4ZFQ <alan4alan@...> wrote:
> I went ahead and replaced Q6. No change.

George,

Replacing things blindly may not work. It is not unusual for several
components to blow in the PA, replacing one component may blow it again.
Voltage readings are important. Also check voltages after you remove a
suspect but before you renew it.

> I will try to get voltages on IC3, but I didn't see the voltages listed
> in the list, are they somewhere else?

http://www.qrp-labs.com/qcx/qcxtrouble.html#transmit
> May I remove the LCD do get to to IC3 and still take the voltages?
Yes

> The QCX was running fine.......

Quite a story:-) Settle down do it slowly. Measure voltages, remove
anything suspect, measure voltages.. Report here.

73 Alan G4ZFQ



Re: No output QCX 40 output drains show 1.6 watts in receive

Alan G4ZFQ
 

I went ahead and replaced Q6. No change.
George,

Replacing things blindly may not work. It is not unusual for several components to blow in the PA, replacing one component may blow it again. Voltage readings are important. Also check voltages after you remove a suspect but before you renew it.

I will try to get voltages on IC3, but I didn't see the voltages listed in the list, are they somewhere else?
http://www.qrp-labs.com/qcx/qcxtrouble.html#transmit
May I remove the LCD do get to to IC3 and still take the voltages?
Yes

The QCX was running fine.......
Quite a story:-) Settle down do it slowly. Measure voltages, remove anything suspect, measure voltages.. Report here.

73 Alan G4ZFQ

Re: No output QCX 40 output drains show 1.6 watts in receive

George Korper
 

Thank you Alan,
Ok so far. First I have a QRL dummy load and it is plugged in. 
I went ahead and replaced Q6. No change. 
I will try to get voltages on IC3, but I didn't see the voltages listed in the list, are they somewhere else?
May I remove the LCD do get to to IC3 and still take the voltages?
The QCX was running fine, but my straight key which was plugged my have
come on while the OLG was connected and running WSPR. I looked at the key and a tiny, tiny speck
of some material was caught in the minute  gap and it took a piece of paper to remove it. If it can happen it will happen I guess.
That is one supposition. In my collection of cables I pulled the key when I realized what was happening and the plug hit something
on the open end of the QCX and some sparks flew. After I cleaned it up, thinking all was lost I checked the QCX and I did see output,
when I realized I had high SWR for some reason, and it turned out what ever happened back in the rat's nest the MFJ SDR switch
was no longer working. The QCX seemed fine, at least in my nervous condition but now I was rattled and decided I should to wait until
morning. I was wrong, now there was no output. The bottom line is at sometime the QCX was operating with the WSPR running and the key shorted, As for the MFG which has an RF sensor that may have just been bad for a while and causing the high SWR. I  noticed that the high SWR caused the QCX to go up very high in power. So as for the cause it is murky!
I have read Han's manual over and over and I do wish I had just settled for seeing that it is better off running at 2 to 3 watts out on my wattmeter
which is 5 watts into a dummy load using the internal rf probe. I would have saved the groups time and a lot of anguish adjusting toroids, etc.

I'd change Q4 but first I will await your reply on IC3 and the removal of the LCD.

.


On Tue, Dec 10, 2019 at 10:56 AM Alan G4ZFQ <alan4alan@...> wrote:
>   I replaced the three BS 170's  in the amp and using
> internal wattmeter show no output

George,

>and 1.6 watts on the drains during
> receive..

The wattmeter only gives sensible results on the output when going into
a dummy load. All other checks should be with the voltmeter.

> I replaced Q5 and no difference.

Check Q6 voltages.  Your "1.6 watts" seems to show that is faulty.
Also check IC3 voltages.
  >Not sure which voltages to check.
As in the manual.

Do you know what happened to cause this? Any observations?

73 Alan G4ZFQ
> I realize there should be no watts on the drain in receive as I checked
> my QCX 20.
> Thanks,
>



Re: QCX/QSX Elmering and Discussion

Christoph Schwärzler
 

Hi Dave,

pls check my original message (https://groups.io/g/QRPLabs/message/40666). You will find the .svg file there.

Vy 73,
Chris, OE1CGS

Re: No output QCX 40 output drains show 1.6 watts in receive

Alan G4ZFQ
 

 I replaced the three BS 170's  in the amp and using
internal wattmeter show no output
George,

and 1.6 watts on the drains during receive..
The wattmeter only gives sensible results on the output when going into a dummy load. All other checks should be with the voltmeter.

I replaced Q5 and no difference.
Check Q6 voltages. Your "1.6 watts" seems to show that is faulty.
Also check IC3 voltages.
>Not sure which voltages to check.
As in the manual.

Do you know what happened to cause this? Any observations?

73 Alan G4ZFQ
I realize there should be no watts on the drain in receive as I checked my QCX 20.
Thanks,

Re: #qcx #firmware 1.03 release (CAT, real time clock) #qcx #firmware

Hans Summers
 

Hi Remi & Zoran

I will check these problems but I do not think either of them are related specifically to 1.03. The lost decoded CW text on dial change is a pre-existing thing and Remi, I think the GPS problems you mention would apply to all QCX versions. It is tested for compatibility with QLG1 but some other modules may be less successful... but I will have a look at that and see if anything can be done. 

73 Hans G0UPL

On Mon, Dec 9, 2019 at 5:01 PM <zj0369@...> wrote:
Hi Hans,

Just to bring it to attention.
If Rx decode is enabled, and there is some decoded message in the second line, when frequency is tuned, decoded text is deleted until new text is updated/displayed. This happens in VFO A, VFO B and also in Split mode for the right part of the second row. This mean that decoded text is not lost, but only cleared and not restored on each dial change. Similar, decoded text is restored back also on each change of the VFO displayed, A, B or Split by using right button.
Nothing problematic, only cosmetic issues.

73, Zoran Z32ZZZ

Re: New qcx build, and problems

Ronald Taylor
 

I stand corrected. Just checked my working QCX20 and indeed CLK2 is not coming out of IC1 at all unless in alignment mode or when transmitting. I really thought it was there all the time. Sorry to add to the confusion. Glad you found this issue with windings. Good luck with that. It’s a great rig. Hope you enjoy using it after it’s all done… 73 … Ron


On Mon, Dec 9, 2019 at 4:07 PM Dave Edwards <kd2e@...> wrote:

Ron...that is what I thought. That is how I read it.  The high from the cpu AND gates the clk2 signal along to antenna.

But....

I was told pin 10 of IC3 is active only when in alignment mode.

What's more....I tested that out, and the clock signal only showed up at pin 10 when I was in alignment mode.  I don't get it!!

But....I was buzzing out the transformer, and found my winding 2 to not be making the correct continuity. So....I'll rewind that tomorrow, and give it another

go.

Thanks for chiming in!

....Dave

On 12/9/19 5:16 PM, Ronald Taylor wrote:
Dave, actually CLK2 signal SHOULD be on pin 10 of IC3 all the time. But it should only be on pin 8, as well as coming into the antenna port end of the low pass filter and into the receiver when in the alignment mode. This mode is turned on when a high from the microprocessor comes in to pin 9 of IC3. 

You should probably check continuity through the bandpass filter as a starting point. If all that looks good then check out Hans’ troubleshooting procedure on the website. It tells some steps to take to troubleshoot the receiver front end. 

73..... Ron

On Mon, Dec 9, 2019 at 07:41 Dave Edwards <kd2e@...> wrote:

Just finished my QCX yesterday....No joy!!

Can anyone tell me if the Clk2 signal at IC3, pin 10 should be there even before entering into alignment?

(clk0, and clk1 are).

I had no signal during Peak BPF ...on display, or headphones.


Thanks all!

....Dave

Re: New qcx build, and problems

Dave Edwards
 

Ron...that is what I thought. That is how I read it.  The high from the cpu AND gates the clk2 signal along to antenna.

But....

I was told pin 10 of IC3 is active only when in alignment mode.

What's more....I tested that out, and the clock signal only showed up at pin 10 when I was in alignment mode.  I don't get it!!

But....I was buzzing out the transformer, and found my winding 2 to not be making the correct continuity. So....I'll rewind that tomorrow, and give it another

go.

Thanks for chiming in!

....Dave

On 12/9/19 5:16 PM, Ronald Taylor wrote:
Dave, actually CLK2 signal SHOULD be on pin 10 of IC3 all the time. But it should only be on pin 8, as well as coming into the antenna port end of the low pass filter and into the receiver when in the alignment mode. This mode is turned on when a high from the microprocessor comes in to pin 9 of IC3. 

You should probably check continuity through the bandpass filter as a starting point. If all that looks good then check out Hans’ troubleshooting procedure on the website. It tells some steps to take to troubleshoot the receiver front end. 

73..... Ron

On Mon, Dec 9, 2019 at 07:41 Dave Edwards <kd2e@...> wrote:

Just finished my QCX yesterday....No joy!!

Can anyone tell me if the Clk2 signal at IC3, pin 10 should be there even before entering into alignment?

(clk0, and clk1 are).

I had no signal during Peak BPF ...on display, or headphones.


Thanks all!

....Dave

Re: New qcx build, and problems

Dave Edwards
 

Thanks Richard.....Some more time at the bench today, and I also found what you noted.

So, I have my clk2!!   :-)

Buzzing out my transformer showed that winding 2 is not making continuity at the specified pads.

So, I pulled it out, and will rewind/reinstall tomorrow.

Got my fingers crossed that this is the culprit!!

....Dave

On 12/9/19 5:48 PM, Richard G4TGJ wrote:
I've just checked my QCX and there is only a signal on pin 10 in alignment mode. There is no signal in receive mode. I didn't check transmit.
--
73
Richard
G4TGJ

Re: New qcx build, and problems

Richard G4TGJ
 

I've just checked my QCX and there is only a signal on pin 10 in alignment mode. There is no signal in receive mode. I didn't check transmit.
--
73
Richard
G4TGJ

Re: New U3S WSPR setup questions

John
 

Bob, just 15 min ago I found the RX mode and coded my void slots for 20 M rx, and now just reading this email. I am waiting for the top of the hour to watch the sequence.
Wednesday is schedule to set the TX bias to the correct level. I am starting with 3 BS-170.
I think I will set the scope across the dummy load. See if all the filters are working OK
--
Pura Vida

John W Clark
73
TI4JWC   TI4/N0URE  N0URE

Re: New qcx build, and problems

Ronald Taylor
 

Dave, actually CLK2 signal SHOULD be on pin 10 of IC3 all the time. But it should only be on pin 8, as well as coming into the antenna port end of the low pass filter and into the receiver when in the alignment mode. This mode is turned on when a high from the microprocessor comes in to pin 9 of IC3. 

You should probably check continuity through the bandpass filter as a starting point. If all that looks good then check out Hans’ troubleshooting procedure on the website. It tells some steps to take to troubleshoot the receiver front end. 

73..... Ron

On Mon, Dec 9, 2019 at 07:41 Dave Edwards <kd2e@...> wrote:

Just finished my QCX yesterday....No joy!!

Can anyone tell me if the Clk2 signal at IC3, pin 10 should be there even before entering into alignment?

(clk0, and clk1 are).

I had no signal during Peak BPF ...on display, or headphones.


Thanks all!

....Dave