Date   

Re: QRPGuys help site?

Jeff Logullo N0̸MII
 

You might consider joining the "CalQRP" group on Groups.io. Ken WA4MNT announced the product on that list, and I think some of the QRP Guys are all on that list. You might post to that list with the issue you're having, and see if anyone there can make suggestions.

Send an email to <CalQRP+subscribe@groups.io>
or visit the page https://groups.io/g/CalQRP
to sign up.

Jeff N0̸MII 


On Sat, Nov 2, 2019 at 3:41 AM David Wilcox via Groups.Io <Djwilcox01=yahoo.com@groups.io> wrote:
Does anyone know of a QRPGuys help site?  I am having trouble with my DSB FT8 kit.

Thanks.

Dave K8WPE




--
Jeff N0̷MII


Re: nouveau 75 Dave Cripe/Voltage Checks

w9ran
 

Dave,

I've got a band-aid that seems to prevent the thermal runaway from happening but I'm hoping you can provide some insight into "why" and perhaps a better solution.

I found some nasty looking oscillations when scoping the gate of Q11 to see why it was turning on - several volts of unstable crud in the 600-800 kHz range.  A 1nF cap to ground reduced the amplitude and shifted the frequency to the 225 kHz range, so I tried higher values.   As much as 10uF reduces the oscillation without noticeable impact as now for the first time I have positive peaks and 100% modulation (even though I see some spiky things on the carrier which I suspect is the same oscillation).

The problem apparently is an instability in the modulator circuit that I'm just minimizing so the circuit can work but and hopefully this will enable you to get a handle on what's really going on. Meanwhile I think I'll try the radio on the air tomorrow morning!

73, Bob W9RAN


Re: nouveau 75 Dave Cripe/Voltage Checks

w9ran
 

On 11/1/2019 1:30 PM, nm0s_qrp via Groups.Io wrote:
voltages measured for Q3 and Q11 swapped
Ah, no, but I read "IRF-510" and forgot there were two of them, and I was measuring Q1 instead of Q12.   Thus my argument about 0 volts on the drain and resting carrier, etc.

Let me try again with new measured values:

           G        D       S

Q3    9       10.3      12.6    FQP7P06

Q11  7.5    3.5*     12.4    FQP7P06

Q12  5.6    3.5*     2.4       IRF510 (NOT the PA one!)

*  the voltage at the drains of Q11 and Q12 measures 3.5V right after the PTT is keyed, but start to rise rapidly, which creates the thermal runaway problem.   The voltage is > 8 volts within 15 seconds or so and when I measured the temp of the Q11 heatsink it quickly rose to > 50 deg.

As with the values your provided, all the above are with PTT keyed but no modulation.

Sorry for the mixup on Q numbers.   Does this suggest anything new?

73, Bob W9RAN


Re: nouveau 75 Dave Cripe/Voltage Checks

nm0s_qrp <ai9e_qrp@...>
 

In the receive mode, all three of these MOSFETS should have no drive, i.e. the gate voltages should be close to the source voltage.  Bob, I think you have the voltages measured for Q3 and Q11 swapped, as the drain voltage you report for Q3 is the same as the drain for Q12.
It looks like the gate voltages on Q11 and Q12 are not correct.  I would suspect failure of Q10 or Q13.  These would be the ones I would try replacing.

73 Dave


Re: nouveau 75 Dave Cripe/Voltage Checks

w9ran
 

On 11/1/2019 5:39 AM, W9GY wrote:
Hi Bob, got same issue on mine.  Q11 get real hot real fast in tx.  I'm awaiting some FETs to arrive before additional troubleshooting.  Please keep me in the loop as to what you find. -
Hi Jeff,

You bet.   The only one I've heard was WA8SAJ's and it sounded good thru a linear.

When I first noticed that Q11 was burning up, I saw that the tab of Q12 might have contacted Q11's heatsink.   But while I was waiting for replacement FETs to come I realized the drain of Q11 and Q12 are connected together in the circuit anyway so it wouldn't have mattered if they were touching.

So we both received defective PC boards it seems.   The more I try to understand what's going on with this modulator the more confused I get!    A complete set of voltage measurements from key nodes - each terminal of all active devices at a minimum - would be a big help.

73, Bob W9RAN


Re: nouveau 75 Dave Cripe/Voltage Checks

W9GY <jeffw9gy@...>
 

Hi Bob, got same issue on mine.  Q11 get real hot real fast in tx.  I'm awaiting some FETs to arrive before additional troubleshooting.  Please keep me in the loop as to what you find.  -73-
Jeff W9GY Calumet, Mi (UP)


Re: nouveau 75 Dave Cripe/Voltage Checks

w9ran
 

On 10/19/2019 8:45 PM, nm0s_qrp via Groups.Io wrote:
I did a quick check of the power transistors on the main PCB, since the SMT parts are too small to probe safely.  With 12.6v supplied, the transmitter keyed, and no modulation:

            G    D    S
Q3    7.9  9.8  11.7    FQP7P06
Q11   12   0    12      FQP7P06
Q12   5.0  0    0       IRF510

A large deviation from these voltages would indicate damage to the board, or defective component.

Hi Dave,

Thanks for that data, but after comparing with my non-working Nouveau 75 I wonder if you could confirm one of those voltages. If  the drain of Q12 is truly at 0 volts with the PTT keyed, there would be zero resting carrier output, and I'm sure that's not right (even controlled carrier rigs have some resting carrier). I measure 10.5 volts on Q12's drain with the PTT keyed, which produces a resting carrier of 3.25 watts and that seems to be in the right ballpark.

The problem I have is that Q11 gets very hot very fast when any modulation is applied and inadequate modulation - something isn't right in the class G modulator.    Here's what those voltages measure on my Nouveau 75:

          G    D    S
Q3   9.6  10.5  13    FQP7P06
Q11   7.5  0  12.7    FQP7P06
Q12   3.8  10.5  .2   IRF510

This modulator never has worked right.  After the first Q11 melted down, I went ahead and replaced all the big FETs, but that did not fix what's wrong.  The BJTs in the modulator have junctions at least, I don't know of a good way to test the small FETs but at least they aren't shorted.

It looks like something is messing up the bias of Q11 -  if the above voltages help you to point me toward the right area of the modulator circuit, I can make additional measurements and do SMT repair.    I just haven't yet had time to build a spice model for that bootstrapped class G modulator to help me understand how it works.

Thanks and 73,

Bob W9RAN


Re: 40 Meter Net announcement

Johnny AC0BQ
 


Thanks Don
I guess my signals are landing some where!
Thanks for The report 


On Wed, Oct 30, 2019 at 8:41 PM W6BOW via Groups.Io <DBuckter=aol.com@groups.io> wrote:
Dear All,

Re: 4SQRP 40M net 10/30/2019

(Mail Read Via K3FEF WebSDR.)

"WQ5RP" (AC0BQ) Solid copy.
"K4ABC" Solid copy.
"WA9PWP" No copy.

"In Memory of Bart Lawson who became SK last week."

Respectfully,

Don 
W6BOW  SF  CA  USA


-----Original Message-----
From: Johnny Matlock <jomatlock@...>
To: 4sqrpio <4SQRP@groups.io>
Sent: Wed, Oct 30, 2019 3:42 pm
Subject: [4SQRP] 40 Meter Net announcement

Terry is busy tonight so 
I will call the 40 meter net at 8:00
PM central Time.

I will use the Club call WQ5RP
In Memory of Bart Lawson who became SK last week.
He was the Trustee for the Club Call.

Hope to cu either on 40 or 80 meters tonight!
72
Johnny AC0BQ 

--
Check out the 4SQRP website at 4sqrp.com

--
Check out the 4SQRP website at 4sqrp.com


Re: For sale shortwave portable

keith ford
 

I am away from the house this week!   

On Thursday, October 31, 2019, 16:12, bobby rolph <rolph981@...> wrote:

I have a Radio Shack DX 398 portable radio for sale. This is the very same radio as the Sangean 909. It is loaded with many features and is in very good condition. It can work on AM,FM,CW AND SSB. The antenna is in good condition. It comes with a carry pouch, manual and wall wart. I am asking $70 shipped to lower US 48. If you are interested or have any questions contact me direct at rolph981@.... Thanks for looking, 73
Bobby Rolph
KB4QNR


Re: For sale shortwave portable

KB9BVN - <kb9bvn@...>
 

I have a DX 398 I bought from the shack almost 20 years ago and it is one of the best and most durable radios I have ever owned. It mostly sits in the bedroom proving local FM reception but from time to time I connect it to the HF antenna and do some SWLing. Great radio Bobby!

Someone will be happy with it.

de KB9BVN

On 10/31/2019 5:12 PM, bobby rolph wrote:
I have a Radio Shack DX 398 portable radio for sale. This is the very same radio as the Sangean 909. It is loaded with many features and is in very good condition. It can work on AM,FM,CW AND SSB. The antenna is in good condition. It comes with a carry pouch, manual and wall wart. I am asking $70 shipped to lower US 48. If you are interested or have any questions contact me direct at rolph981@... <mailto:rolph981@...>. Thanks for looking, 73
Bobby Rolph
KB4QNR


For sale shortwave portable

bobby rolph
 

I have a Radio Shack DX 398 portable radio for sale. This is the very same radio as the Sangean 909. It is loaded with many features and is in very good condition. It can work on AM,FM,CW AND SSB. The antenna is in good condition. It comes with a carry pouch, manual and wall wart. I am asking $70 shipped to lower US 48. If you are interested or have any questions contact me direct at rolph981@.... Thanks for looking, 73
Bobby Rolph
KB4QNR


4SQRP DELTA MIKE ROMEO NET

Robert
 

TONIGHT'S TOPIC WAS HEATH KIT RIGS, DID YOU EVER HAVE ONE?

TONIGHT'S CHECK INS

NK8O CHARLES
WG5F ED
W8NWA MIKE
N4KV JOHN
AC0BQ JOHNNY
WW9H JIM
N0TGR DICK
WA9BNZ BILL
KB0MOE DON
N0SO MIKE

GREAT NET THANKS TO  ALL WHO CHECKED IN TO THE NET WHERE SUNSPOTS JUST DON'T MATTER MUCH HI HI

73'S
BERT
N0YJ


40 AND 80 METER NET REPORT

Johnny AC0BQ
 

Ge All:
Thanks for the nice nets tonight.
I was using the 4 sqrp Club call WQ5RP in Bart Lawson's memory tonight.
He was the trustee of the club call as well as good friend and will
be missed by many.
--
Check ins were:
40 metersWB0CFF CARL
WA9PWP PAUL
K4ABC JIM

80 M check in's were:
WA9PWP PAUL
NK80 CHAS
N0YJ BERT
WB0CFF CARL
and
W0PWE JERRY at 2 watts! Nice job Jerry!

Thanks all for helping me remember a old friend that became SK las week.
Rest in peace Bart!
72
Johnny AC0BQ


QRP....."More smiles per Watt"
72
JOHNNY AC0BQ ..


Re: 40 Meter Net announcement

W6BOW
 

Dear All,

Re: 4SQRP 40M net 10/30/2019

(Mail Read Via K3FEF WebSDR.)

"WQ5RP" (AC0BQ) Solid copy.
"K4ABC" Solid copy.
"WA9PWP" No copy.

"In Memory of Bart Lawson who became SK last week."

Respectfully,

Don 
W6BOW  SF  CA  USA


-----Original Message-----
From: Johnny Matlock <jomatlock@...>
To: 4sqrpio <4SQRP@groups.io>
Sent: Wed, Oct 30, 2019 3:42 pm
Subject: [4SQRP] 40 Meter Net announcement

Terry is busy tonight so 
I will call the 40 meter net at 8:00
PM central Time.

I will use the Club call WQ5RP
In Memory of Bart Lawson who became SK last week.
He was the Trustee for the Club Call.

Hope to cu either on 40 or 80 meters tonight!
72
Johnny AC0BQ 

--
Check out the 4SQRP website at 4sqrp.com


Wednesday Evening 40 and 80 meter Nets - Wed, 10/30/2019 #cal-notice

main@4SQRP.groups.io Calendar <noreply@...>
 

Wednesday Evening 40 and 80 meter Nets

When:
Wednesday, 30 October 2019
8:00pm to 9:00pm
(GMT-05:00) America/Chicago

Where:
40 and 80 Meters

Organizer:
jomatlock@...

Description:
The 40 Meter Net will be at 8:00 pm DST central time  on 7.122 +-. QRM
NCS is WQ5RP Terry.

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central DST Time Wednesday). 
The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operators are Johnny AC0BQ or Paul N0NBD.

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 0300 UTC (9:00PM Central Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: Nouveau 75 Power Output

Charles W. Powell
 

I was worried that my Nouveau 75 was not putting out enough power because it only showed about 3 watts of carrier on my scope.  But I finally picked up the mic today and jumped into the end of a QSO and get a 5x9 report from Fort Scott, just shy of 50 miles south as the crow flies.  My antenna is probably too high for ideal NVIS, but it did work.   The audio is apparently quite good with the limiter lighting the panel LED on high peaks.

I have to admit, I was more than excited when the radio worked so well.  

72,

Charles - NK8O

On Oct 30, 2019, at 10:23 AM, Curt M. <WU3URADIO@...> wrote:

[Edited Message Follows]

I'm using an end fed wire.  One guy has a full size 80m dipole and the other was only about 5 miles away with a Tarheel on the mobile.  The guy that could hear me on the 7300 was the guy with the Tarheel.  The guy with the full size 80m dipole couldn't hear me on either radio.

My end fed wire is short for 80m at 44' but I nearly have my Worked All States on 80m SSB phone but that's with 100w.


40 Meter Net announcement

Johnny AC0BQ
 

Terry is busy tonight so 
I will call the 40 meter net at 8:00
PM central Time.

I will use the Club call WQ5RP
In Memory of Bart Lawson who became SK last week.
He was the Trustee for the Club Call.

Hope to cu either on 40 or 80 meters tonight!
72
Johnny AC0BQ 

--
Check out the 4SQRP website at 4sqrp.com


Upcoming Event: Wednesday Evening 40 and 80 meter Nets - Wed, 10/30/2019 8:00pm-9:00pm #cal-reminder

main@4SQRP.groups.io Calendar <main@...>
 

Reminder: Wednesday Evening 40 and 80 meter Nets

When: Wednesday, 30 October 2019, 8:00pm to 9:00pm, (GMT-05:00) America/Chicago

Where:40 and 80 Meters

View Event

Organizer: jomatlock@...

Description: The 40 Meter Net will be at 8:00 pm DST central time  on 7.122 +-. QRM
NCS is WQ5RP Terry.

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central DST Time Wednesday). 
The 80 meter net will be called on 3.564 MHz +/- QRM.
Net control operators are Johnny AC0BQ or Paul N0NBD.

* NEW *  Wednesday evening DMR Voice Net will be at (Thursday) 0300 UTC (9:00PM Central Time Wednesday/)
Four States QRP has a Brandmeister DMR Talk Group (TG31654). Join us to discuss QRP, ask questions, or just ragchew. The Wednesday net is a directed net  but any other time you may use the Talk Group to chat with other QRPers.
Net Control operator is Bert NØYJ.


Re: Nouveau 75 Power Output

Curt M.
 
Edited

I'm using an end fed wire.  One guy has a full size 80m dipole and the other was only about 5 miles away with a Tarheel on the mobile.  The guy that could hear me on the 7300 was the guy with the Tarheel.  The guy with the full size 80m dipole couldn't hear me on either radio.

My end fed wire is short for 80m at 44' but I nearly have my Worked All States on 80m SSB phone but that's with 100w.


Re: Nouveau 75 Power Output

Dave Benson
 

Curt-

>I tried to make a local contact with it and the two guys couldn't hear me.  I used my IC-7300 on full power (25w) and the same antenna and they said they could barely make me out.<

If they're local... and not hearing you.... I'll ask if your antenna is a vertical.

Jim- W1PID- and I couldn't even hear each other on CW when I used a vertical.  We're 30 miles apart.  Now that I have a dipole up, we're 20-over-S9 on 75M at 10W PEP.

73- Dave





On Wed, Oct 30, 2019 at 10:31 AM Curt M. <WU3URADIO@...> wrote:
Has anyone done any testing on the power output of their Nouveau 75?

I have an basic inexpensive DIamond SX200 meter which I suspect isn't perfect across all of the bands for which it was designed for.  If I set the switch for PEP I getting a carrier of 4w.  If I set the mic gain to where it just starts to turn the LED on and I give  fairly loud "Hello!" into the mic I think the meter jumps up to around 10-12w.  If I turn the mic gain up and in the same tone say, "Hello!" it goes to about 18w.

I was kind of thinking that with the mic gain set correctly I would get a little higher output than the 10-12w that I am seeing.  Again, it could be the meter but that's all that's I have.  My Bird 43 without the PEP option will probably not give me a good reading.  Actually I checked the carrier with it and using a brand new 25w slug and it was about 2.5w.  

What's everyone else's experience been with power tests?  Not sure if mine has an issue or not.  The receive clarity is excellent.  

I tried to make a local contact with it and the two guys couldn't hear me.  I used my IC-7300 on full power (25w) and the same antenna and they said they could barely make me out.

Curt M.