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Nouveau 75 Errata


nm0s_qrp <ai9e_qrp@...>
 

For those who have just purchased our new Nouveau 75 kit, a sharp-eyed builder has spotted two errata in the manual dated 7-21-19.  They are:
 
1.  The instruction manual dated 7-21-19 has incorrect directions for inserting Q2.  It should read: 'Insert Q2 with the large flat side facing the RIGHT of the board.'
 
2.  Instructions for connecting the ribbon cable were incomplete.  Pin 1 on the PCB connects to the LED board terminal labeled 'CLK'.

A corrected manual will be uploaded to the kit web page soon.

73 Dave Cripe NM0S


Paul AI4EE
 

Where does the CLK1 on the synthesizer chip go to? Can't find it on the schematic. Thanks.


On 8/9/2019 10:58 AM, nm0s_qrp via Groups.Io wrote:
For those who have just purchased our new Nouveau 75 kit, a sharp-eyed builder has spotted two errata in the manual dated 7-21-19.  They are:
 
1.  The instruction manual dated 7-21-19 has incorrect directions for inserting Q2.  It should read: 'Insert Q2 with the large flat side facing the RIGHT of the board.'
 
2.  Instructions for connecting the ribbon cable were incomplete.  Pin 1 on the PCB connects to the LED board terminal labeled 'CLK'.

A corrected manual will be uploaded to the kit web page soon.

73 Dave Cripe NM0S

Virus-free. www.avast.com


K4ENC
 

Got the info and corrected my build  but now have a heat problem with q 11 in rec.   made a contact with it and told it sounds great...any suggestions on the heat issue


K4ENC
 

IT  STARTS HEATING UP AS SOON AS U FLIP THE SW.....DIDNT NOTICE IT WITH THE FIRST CONTACE  RIGHT OFF...TO EXCITED THAT IT WAS WORKING??
                          BOB

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

From: "K4ENC"
To: main@4SQRP.groups.io
Cc:
Sent: Sunday August 11 2019 2:22:14PM
Subject: Re: [4SQRP] Nouveau 75 Errata

Got the info and corrected my build  but now have a heat problem with q 11 in rec.   made a contact with it and told it sounds great...any suggestions on the heat issue


K4ENC
 

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


Dave Benson
 

The voltage across R39 (10K) should be 0V in receive. You also want to verify
 the resistance to ground there (w/ power removed) in case there's a short somewhere.

- Dave, K1SWL


On Mon, Aug 12, 2019 at 8:20 AM K4ENC <K4ENC@...> wrote:

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


nm0s_qrp <ai9e_qrp@...>
 

If there is heating in Q11 during receive, that suggests there may be leakage in Q12.  Is it getting warm as well?  Check the gate voltages of both Q11 and Q12 during receive, and make sure they are not being turned on.

73 Dave NM0S


Bill VanKirk
 

I noted in the manual L-2 shows 17T and L-4 18T. The schematic shows L-2 16T and L-4 16T. Which one is correct?

Thanks!
Bill

--
73
Bill
W0PT


K4ENC
 

HI  DAVE
             7.1 V  ACROSS R39                      NOTHING TO GR.

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

From: "Dave Benson"
To: main@4sqrp.groups.io
Cc:
Sent: Monday August 12 2019 1:16:47PM
Subject: Re: [4SQRP] Nouveau 75 Errata

The voltage across R39 (10K) should be 0V in receive. You also want to verify
 the resistance to ground there (w/ power removed) in case there's a short somewhere.

- Dave, K1SWL


On Mon, Aug 12, 2019 at 8:20 AM K4ENC <K4ENC@...> wrote:

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


nm0s_qrp <ai9e_qrp@...>
 

One of my priority items for this week is to compile a troubleshooting guide with expected voltages.  You'll see it hopefully by the end of the week.

73 Dave


Dave Benson
 

Bob-

There's clearly leakage current in that area of the circuitry. Dave C's on it, so you're in good hands.

73- Dave


On Mon, Aug 12, 2019 at 2:37 PM K4ENC <K4ENC@...> wrote:
HI  DAVE
             7.1 V  ACROSS R39                      NOTHING TO GR.

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

From: "Dave Benson"
To: main@4sqrp.groups.io
Cc:
Sent: Monday August 12 2019 1:16:47PM
Subject: Re: [4SQRP] Nouveau 75 Errata

The voltage across R39 (10K) should be 0V in receive. You also want to verify
 the resistance to ground there (w/ power removed) in case there's a short somewhere.

- Dave, K1SWL


On Mon, Aug 12, 2019 at 8:20 AM K4ENC <K4ENC@...> wrote:

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


K4ENC
 

HI  DAVE
         FOUND Q 10 RUNNING HOT ALONG WITH Q-11???????????????????????/
                                     BOB

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

From: "K4ENC"
To: "main@4SQRP.groups.io"
Cc:
Sent: Monday August 12 2019 2:04:32PM
Subject: Re: [4SQRP] Nouveau 75 Errata

HI  DAVE
             7.1 V  ACROSS R39                      NOTHING TO GR.

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

From: "Dave Benson"
To: main@4sqrp.groups.io
Cc:
Sent: Monday August 12 2019 1:16:47PM
Subject: Re: [4SQRP] Nouveau 75 Errata

The voltage across R39 (10K) should be 0V in receive. You also want to verify
 the resistance to ground there (w/ power removed) in case there's a short somewhere.

- Dave, K1SWL


On Mon, Aug 12, 2019 at 8:20 AM K4ENC <K4ENC@...> wrote:

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


K4ENC
 

found  q 10 is getting hot along with q 11...……...any ideas ???????

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

From: "Dave Benson"
To: main@4sqrp.groups.io
Cc:
Sent: Monday August 12 2019 1:16:47PM
Subject: Re: [4SQRP] Nouveau 75 Errata

The voltage across R39 (10K) should be 0V in receive. You also want to verify
 the resistance to ground there (w/ power removed) in case there's a short somewhere.

- Dave, K1SWL


On Mon, Aug 12, 2019 at 8:20 AM K4ENC <K4ENC@...> wrote:

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


Jim Long
 

With these issues being discussed, is it wise not to install these until a decision is made about a fix, or can one proceed?     I hate to unsolder, because I am not skilled in doing it.

Jim 



nm0s_qrp <ai9e_qrp@...>
 
Edited

Regarding the observed Q11, Q10 heating, in normal operation these will exhibit no heating at all in the receive mode.
 
What I suspect has happened is that Q11 and Q12 had shorted together with power applied, and damaged some components on the board, resulting in the heating observed.
 
Notice that Q11 and Q12 are close together on the board.  This is why the assembly instructions explicitly specify that the heat sink mounting screws are to be installed through the back of the heat sink, emerging through the tab of the transistor.  This limits the opportunity for the two transistors to come in electrical contact.
 
So to reiterate, the hardware stackup should be screw, passing through flat washer, back of heat sink, black heat sink pad, back of transistor, lock washer, and nut.
 
The three legs on the heat sink should be snipped off.
 
Before soldering the transistor to the board, check the spacing between the heat sink and the board to make certain that the sink does not contact any of the surface mount components on the board.  Readjust the sink on the transistor if necessary.  Only then should you solder the transistor down.
 
Finally, be certain that there is no contact between Q11 and Q12 before power up.
 
That should prevent any of damage to components due to heat sink shorting.
 
73 Dave NM0S


nm0s_qrp <ai9e_qrp@...>
 

The manual is correct.  I'll correct the schematic ASAP.


hamhog1
 

The photos from the photo page show just the opposite arrangement of the screws for the heat sink.

Gary K4VIG


--
Gary K4VIG


K4ENC
 

THE HEATING PROBLEN FIXED   REPLACED Q 11...………….
WHEN RIG IS TURNED ON DESPLY  SHOWS   NO 75 AND THEN GOES TO FREQ THAT WAS SET????? ANY IDEAS???
                            BOB  K4ENC

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

From: "K4ENC"
To: "main@4SQRP.groups.io"
Cc:
Sent: Monday August 12 2019 2:04:32PM
Subject: Re: [4SQRP] Nouveau 75 Errata

HI  DAVE
             7.1 V  ACROSS R39                      NOTHING TO GR.

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

From: "Dave Benson"
To: main@4sqrp.groups.io
Cc:
Sent: Monday August 12 2019 1:16:47PM
Subject: Re: [4SQRP] Nouveau 75 Errata

The voltage across R39 (10K) should be 0V in receive. You also want to verify
 the resistance to ground there (w/ power removed) in case there's a short somewhere.

- Dave, K1SWL


On Mon, Aug 12, 2019 at 8:20 AM K4ENC <K4ENC@...> wrote:

Looking   some volt reading around  Q11  and D 6……………….Q11 running very hot in rec.

                                                       Bob

 

Sent from Mail for Windows 10

 


K4ENC
 

IS THERE ANOTHER WAY TO GET RX   AND TX  TOGETHER..CANT  COPY WWV OR CUBA WITH RIG   EVEN AT 0300...………….  OTHER OPTIONS?????

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

From: "nm0s_qrp via Groups.Io"
To: main@4sqrp.groups.io
Cc:
Sent: Tuesday August 13 2019 1:03:38PM
Subject: Re: [4SQRP] Nouveau 75 Errata

One of my priority items for this week is to compile a troubleshooting guide with expected voltages.  You'll see it hopefully by the end of the week.

73 Dave
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Charles W. Powell
 

So is the silk screen for Q2 incorrect on the board?  Looking from the front of the board, the flat side is to the LEFT.  I will wait to hear before I install it.

72,

Charles - NK8O