Date   

Re: Nouveau 75A PTT

Donald <donwestpwl@...>
 

Hey John,

Maybe you want to amplify your Nouveau because...

You and your best friend now live out of range of a Nouveau 75, but an amp lets you ragchew reliably. What's better than ragchewing with a buddy, on something you built?
Maybe you like hiking/camping operating, and you like to take a portable amp, for those challenging circumstances.

Maybe you've got a squirrel using your 80 meter antenna for a shortcut to the bird feeder, and you want to see how he reacts to a couple hundred watts of "CQ squirrel, CQ squirrel".

Maybe you've got some big amplifiers and you really enjoy using them with all your radios.

73, Donald, KB5PWL

On 4/15/2020 6:58 AM, John P Lloyd via groups.io wrote:
Hello Rex,
I was reading your email and was wondering what is the point of running high power when the Noveau (and the retro 75, I have both) are basically deaf?

When I inquired about this a few months ago i found on the web the explanation that as the Noveau only was a 5 watt rig and better sensitivity was not needed.

I measured my  Noveau with an elecraft signal source.

Please understand I don't mean any disrespect in my email, just trying to understand the reasoning.

73, john w4jpl


Re: Nauveau 75 no modulation

Tim
 

Measured the signal on mic input and it was RF! Right on TX frequency.
Audio is getting thru but swamped by RF signal.
Tim


Re: Nauveau 75 no modulation

Tim
 

More testing
Connected mic on bench to DC pwer thru 1K resistor, shorted PTT and measure 40mV P-P on oscope while talking in normal voice, seems abt right
Tapped into the mic jack on rig, activated PTT and there was a strong signal applied to mic input from rig, I would say 200-300mV P-P and nulled any audio from mic.
So I think there is an issue with my rig :(.
Tim 


Second Sunday Sprint Results

John Lonigro
 

Based on this month's SSS participation, it's obvious to me that a lot of people are abiding by the "stay at home" directive, and that, as a result, they are spending more time on the radio.  We had 17 people record their scores for April.  I haven't checked but this has got to be a record number of participants.  We even had one person enter for the first time, just recently becoming a member of 4SQRP.  He is Sean Kutzko, KX9X, member #2199.  Welcome Sean!  Hope you are able to participate in future months as well.

The winner for April was Chas, W2SH, with 27 total points. Congratulations Chas.  Chas is also leading in the overall contest, with 60 points.  So in one month, Chas almost doubled his score. Very impressive.  John, K4BAI, came in second this month, with 26 points.  He is also in second place overall, with 46 points.  In third place overall is Nick WB5BKL, with 35 total points.

There were several members who participated for the first time this year, other than Sean (KX9X).  Ed (WG5F), Dale (WN0WWY), Joe (W0MQY), John (AL7JK), George (K3EMS), and David (K5IX) all entered for the first time this year.  I hope you gentlemen will continue participating throughout the year.  It's a lot more fun with 17 entries than with 6 or 8.

Chas can expect his April certificate in his in-box shortly.

Until next month, 72 and stay safe,

John, AA0VE
4SQRP Contest Coordinator


Re: Nauveau 75 no modulation

Tim
 

Well about out of hair! 
Tried everything still no modulation.
Changed mic element, verified mic cable was ok and pins connected properly. 
Out of ideas.
On RX I did notice on very strong signal there was motorboating in audio and no tuning cycled power back to normal.
Not sure that is even related!
Tim 


Re: Nouveau 75A PTT

John P Lloyd
 

Hello Rex,
I was reading your email and was wondering what is the point of running high power when the Noveau (and the retro 75, I have both) are basically deaf?

When I inquired about this a few months ago i found on the web the explanation that as the Noveau only was a 5 watt rig and better sensitivity was not needed.

I measured my  Noveau with an elecraft signal source.

Please understand I don't mean any disrespect in my email, just trying to understand the reasoning.

73, john w4jpl 



Sent via the Samsung Galaxy S8, an AT&T 5G Evolution capable smartphone


-------- Original message --------
From: Rex K0KP <rex@...>
Date: 4/14/20 9:36 PM (GMT-05:00)
To: main@4SQRP.groups.io
Subject: [4SQRP] Nouveau 75A PTT

[Edited Message Follows]

I posted this to the N75 sub group but I'm not sure who might get it there so I will post here as well just in case.

Regarding a PTT solution for my Nouveau so that it will key an external amplifier please refer to the attached schematic and photos.  A relay works fine to key the external amplifier because the Nouveau has an exceptionally long delay after keying the mic circuit before it begins generating RF.  The relay gives additional isolation without any amplifier hot switching even with the extra time for the isolation relay to close.  This works well with my AL-811H and my RF2K+.  The RF2K+ will generate legal limit AM with the 5 watt Nouveau drive.

Thanks to David Cripe NM0S for help with this.


Upcoming Event: Wednesday Evening 40 and 80 meter Nets - Wed, 04/15/2020 8:00pm-9:00pm #cal-reminder

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

Reminder: Wednesday Evening 40 and 80 meter Nets

When: Wednesday, 15 April 2020, 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 central time  on 7.122 +-. QRM
NCS is WQ5RP Operator to be determined.

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central 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: Nauveau 75 no modulation

AndyH
 

Hi Tim,

   There's a good copy of the schematic in the build instructions on pages 14-16:  http://www.4sqrp.com/kits/n75/N75NewManual.pdf
  
    73, Andy, KG5RKP


On Tue, Apr 14, 2020 at 11:29 AM, Tim wrote:
took back off mic and there is something wrong with wiring!
is there a clearer schematic for rig? when I view the one on 4sqrp site it is blurry
Tim


Re: Nauveau 75 no modulation

K0WDO Will Osborn
 

Okay now I understand! Thanks for the terrific explanation Bob!

73, Will
K0WDO

On Apr 14, 2020, at 12:37 PM, w9ran <w9ran@oneradio.net> wrote:

On 4/14/2020 12:06 PM, K0WDO Will Osborn via groups.io wrote:
Are you thinking we’re using the speaker as a dynamic mic of sorts instead of the electret and that’s why we have to crank the gain all the way up and shout?
To be clear, the speaker connection from the speaker-mic is not hooked up inside the radio, only the mic terminal is used. It's on the ring closest to the sleeve and seems to be a non-standard wiring scheme. The PTT switch is connected in series inside the mic and PTT is sensed by Q14 and U2 while the mic audio from the electret element is capacitively coupled to another section of U2 where it is amplified and gain-adjusted. If the radio is switching to transmit mode (speaker audio is muted) but there is no TX audio, I'd look in that area.

I guess it was done this way because of the desire to supply a mic as part of the kit, but in my view it would have been preferable to go with a conventional mic preamp and PTT line that would be grounded to transmit so users would be able to easily use any mic of their choice, or an external audio source. The supplied mic sounds OK but lacks the mids and highs that greatly improve speech intelligibility. I use a TRRS extension cable on it since the right-angle plug was always rubbing against the knob and adjusting the mic gain setting for me ;-)

73, Bob W9RAN





Re: Nauveau 75 no modulation

Tim
 

No using condenser mic
I see 2200 ohm resistor across mic output lifted it ant no PTT so there needs to some resistance there
I an going to see what  max resistance will trip PTT maybe that will cut the attenuation 
Second up is change mic element I have a few spares
Even wired correctly and mic gain to max I an getting no modulation!
Tim W4YN


Re: Nauveau 75 no modulation

w9ran <w9ran@...>
 

On 4/14/2020 12:06 PM, K0WDO Will Osborn via groups.io wrote:
Are you thinking we’re using the speaker as a dynamic mic of sorts instead of the electret and that’s why we have to crank the gain all the way up and shout?
To be clear, the speaker connection from the speaker-mic is not hooked up inside the radio, only the mic terminal is used.   It's on the ring closest to the sleeve and seems to be a non-standard wiring scheme.   The PTT switch is connected in series inside the mic and PTT is sensed by Q14 and U2 while the mic audio from the electret element is capacitively coupled to another section of U2 where it is amplified and gain-adjusted.    If the radio is switching to transmit mode (speaker audio is muted) but there is no TX audio, I'd look in that area.

I guess it was done this way because of the desire to supply a mic as part of the kit,  but in my view it would have been preferable to go with a conventional mic preamp and PTT line that would be grounded to transmit so users would be able to easily use any mic of their choice, or an external audio source.   The supplied mic sounds OK but lacks the mids and highs that greatly improve speech intelligibility.   I use a TRRS extension cable on it since the right-angle plug was always rubbing against the knob and adjusting the mic gain setting for me ;-)

73, Bob W9RAN


Re: Nauveau 75 no modulation

K0WDO Will Osborn
 

This is how mine is wired. Are you thinking we’re using the speaker as a dynamic mic of sorts instead of the electret and that’s why we have to crank the gain all the way up and shout?

73, Will 
K0WDO 


On Apr 14, 2020, at 11:01 AM, KG0DQ <KG0DQ.listen@...> wrote:

Tim,

Check your microphone, it’s not a high dollar microphone. Mine was wired wrong. The speaker was wired to the tip and the electret was on the ring ground was the sleeve. 


Re: Nauveau 75 no modulation

K0WDO Will Osborn
 

Hi Tim! Finished my N75a yesterday. I had the same issue and thought I had a bad mic until I maxed out the mic gain and talked very loud in the mic. Even at 90% mic gain there is zero audio but turn it clockwise till it stops and I now get about 10 watts PEP and a 4 watt carrier. I can hear myself on a nearby receiver. 

Keep us posted! I’m still testing mine. 

73, Will 
K0WDO 


On Apr 14, 2020, at 8:45 AM, Tim <w4yn@...> wrote:

Nice 5 watt carrier but I get no modulation with MIc.
PTT on mic is very stiff but I do not think that is a problem.
Anyone else have that issue before I drag out Oscope!
Tim W4YN


Re: Nauveau 75 no modulation

N7JS
 

With the stock microphone, I'm having to crank up the mic gain all the way to get the LED to flicker.  Also noticing a lot of hum on the audio (even though using a regulated power supply).

73 Jim, N7JS

On 4/14/2020 8:22 AM, KG0DQ wrote:
Tim,

Check your microphone, it’s not a high dollar microphone. Mine was wired wrong. The speaker was wired to the tip and the electret was on the ring ground was the sleeve. 


Re: Nauveau 75 no modulation

Timothy East
 

I don’t have a better copy. Perhaps contacting the kitter or a member of 4sqrp leadership to obtain a clearer schematic. 
Tim
K0EMP 

On Apr 14, 2020, at 11:29, Tim <w4yn@...> wrote:

took back off mic and there is something wrong with wiring!
is there a clearer schematic for rig? when I view the one on 4sqrp site it is blurry
Tim


Re: Nauveau 75 no modulation

Tim
 

took back off mic and there is something wrong with wiring!
is there a clearer schematic for rig? when I view the one on 4sqrp site it is blurry
Tim


Re: Nauveau 75 no modulation

Timothy East
 

Tim,
This is Tim, K0EMP.

I also had a similar experience.  Turned out I had a short in the mic cable just below the mic head.  I suggest you check the mic writing first and if that is not it that you next try keying the PPT and manipulating the mic cable to see if things start working.

Mine did start up and I got a replacement mic that corrected the problem completely.

Best of luck.  Its a great kit.

Tim
K0EMP

On Apr 14, 2020, at 9:22 AM, KG0DQ <KG0DQ.listen@...> wrote:

Tim,

Check your microphone, it’s not a high dollar microphone. Mine was wired wrong. The speaker was wired to the tip and the electret was on the ring ground was the sleeve. 


Re: Nauveau 75 no modulation

KG0DQ
 

Tim,

Check your microphone, it’s not a high dollar microphone. Mine was wired wrong. The speaker was wired to the tip and the electret was on the ring ground was the sleeve. 


Nauveau 75 no modulation

Tim
 

Nice 5 watt carrier but I get no modulation with MIc.
PTT on mic is very stiff but I do not think that is a problem.
Anyone else have that issue before I drag out Oscope!
Tim W4YN


Upcoming Event: Wednesday Evening 40 and 80 meter Nets - Wed, 04/15/2020 8:00pm-9:00pm #cal-reminder

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

Reminder: Wednesday Evening 40 and 80 meter Nets

When: Wednesday, 15 April 2020, 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 central time  on 7.122 +-. QRM
NCS is WQ5RP Operator to be determined.

Wednesday evening 80 Meter CW Net. will be at  (8:30PM Central 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.

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