Date   

Re: PA for qcx 40m #qcx40

Gary Bernard
 

What kind of antenna are you using?


On Jun 6, 2020, at 7:28 PM, Darren KN4WML <darrent78@...> wrote:

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: PA for qcx 40m #qcx40

Darren KN4WML
 

How much power? That I don't even know yet, I haven't purchased a meter to test yet. I'm looking to get one by the end of the week.   As far as I know I might not even been transmitting at all.   


On Sat, Jun 6, 2020, 9:34 PM Mike Besemer - WM4B <mwbesemer@...> wrote:

Darren,

 

Just for grins, set up for WSPR and see what you get for spots at http://wspr.aprsinfo.com/.

 

How much power are you using now?

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Darren KN4WML
Sent: Saturday, June 6, 2020 9:29 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] PA for qcx 40m #qcx40

 

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren

KN4WML,


Re: PA for qcx 40m #qcx40

Mike Besemer - WM4B
 

Darren,

 

Just for grins, set up for WSPR and see what you get for spots at http://wspr.aprsinfo.com/.

 

How much power are you using now?

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Darren KN4WML
Sent: Saturday, June 6, 2020 9:29 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] PA for qcx 40m #qcx40

 

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren

KN4WML,


PA for qcx 40m #qcx40

Darren KN4WML
 

Question from a newcomer.   With the 40m qcx, would it be helpful to add on a PA to this kit?  I have an average ant up about 30+- feet in the sky. I receive pretty well in the evenings but I don't seem to be getting any responses back.   I'm thinking I don't have enough powertpower get out?

Darren
KN4WML,


Re: Shipping FAQ

Gwen Patton
 

That's why they're called the US Snail.

US-Snail-Oliphant.jpg

-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P


On Sat, Jun 6, 2020 at 8:28 PM Ham Radio <bernard.murphy@...> wrote:

If a Post Office is involved in a delivery,  the time multiplies.  I have had orders from Tayda (in Thailand) via DHL take 3 calendar days.

For your new QRPLabs toys, use FedEx and spend the extra dollar — well worth it.   
--
73, Bernie, VE3FWF


Re: Shipping FAQ

Ham Radio
 

If a Post Office is involved in a delivery,  the time multiplies.  I have had orders from Tayda (in Thailand) via DHL take 3 calendar days.

For your new QRPLabs toys, use FedEx and spend the extra dollar — well worth it.   
--
73, Bernie, VE3FWF


Re: Clock Alarm with Speaker within Case #clock #case #mods

collinschip2@...
 

Happy Saturday.  Our clock, audio amo, and speaker are now operating great.   We can play the chimes based on an alarm setting.

However,  we are experiencing a steady humming in the speaker when power is enabled and the backlight is on.  I read about a "mute circuit" that may block the humming, when the alarm is not playing. Is there a simplified way to implement a muting circuit?  We would welcome any suggestions.

Also,  we are exploring components or other options (I.e. additional resistors) to dampen or decrease the loudness of the Westminster chimes.  Any suggestions for a low-cost way to do this?

Much thanks for the knowledge in this message board.

Chip Collins,
N4CHP


Re: #qcx serial number #qcx

 

Ah, well now, you may have mistaken me for someone with some authority or control...
Far from it ;-)
Sorry, that would be now be a question for Hans :-)
--
Julian, N4JO.


Re: #qcx serial number #qcx

Jim Painter
 

Julian, the highest order number on that list is 35614. My order number is 36290. Is there an updated list.

Thanks....Jim...KQ3S


On Jun 4, 2020, at 11:23 AM, Julian Opificius <n4jo@...> wrote:


Re: Two possible improvements for the QCX/QCX+

ajparent1/KB1GMX
 

Is this to be a clock or a radio?

Part two if in the field do you carry a GPS or digital smart phone?
Do you need redundant time?

I'm trying to understand why this is a critical feature.

Allison
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Re: Polyphase board

ajparent1/KB1GMX
 

1800hz, no idea where you get that.

See the plots on the stor page   http://qrp-labs.com/polyphase.html

It mentions to 1800 hz for things like WSPR and other digital modes but
the board does as shown.

1800hz for SSB  would be on the narrow side.  But thats not the intended application
other than incidental.  Tweaking the Polyphase alone likely will not get you what
you want as its mostly GIGO.

The yabut is the 4 caps I mentioned last time and that also colors the bandwidth
as will the output transformers.

So the QDS detector caps C3-6 must be smaller.
Also the bandwidth of the 600ohm transformer will be only as specified if loaded
to 600 ohms, even then there will be significant roll off under 300hz and likely
the high side too.  They are designed to old school hard-copper telephone
bandwidth (not Iphone) is 200hz at the low end is maybe about it.

Allison
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Re: Polyphase board

Mike Hadley
 

Thanks for that Alison. The bandwith of the board (as supplied) tops at 1800Hz, Hans suggests that ssb should be okay but am I wrong in thinking 2400 would sound much different?


I would be using both methods of reception, I Q into my pc and polyphase when mobile/portable.


Not sure if any other polyphase users have carried out mods to this board. Guess I'll wait until its fully assembled and use the monitors either side of my head, hi.


Mike G4JXX

Sent from my Xperia™ by Sony smartphone


External amplifier control for U3

Manuel Verde Salmerón
 

Hi.
I have ultimate U3, plate "Rev 2".
I want to put an external applicator to increase the output power
First I'm going to do the transformation to go from U3 to U3S. (Https://www.qrp-labs.com/ultimate3/u3mods/u3tou3s.html)
When making this modification, the microprocessor's PB5 signal is not used.
Can this signal be used to activate an external amplifier?
How else could it be done?
Regards.
Manuel EA7TB


Re: How about an ultra-portable "QCX mini" version? #qcx

ajparent1/KB1GMX
 

Atmel and Microchip is one and the same also the largest MPU maker and has several
dozen architectures.

PIC16.18.24,32
MIPS, 
ARM
8051 family  based
and likely a few forgotten.

Arduino is not a MPU, its a system and the key element is helping the user get past
the hardware to doing something.  By doing that it often obscures the underlying
hardware enough to make it easy to use and also hard to exploit all its features. 

Bottom line discussing Arduino in the context of QCX is senseless.  It happens
to use the Atmega328 (its a series and happens to be used in the UNO, not the
nano that's a 328PU 32pin TQSD which has two more A-D.) and programmed
to the iron level.  That means one has to have knowledge of all the internal
registers  and understand the features.  The  language and tools used are
only means to the ends.

Likely I'm one of the few that designed, built and programmed micro processors 
starting with the great grand daddy of them all the 8008 when it was $180 for
the cheap slower part.  And most of those created since.  Typically in assembler.

Allison
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Re: Shipping FAQ

ajparent1/KB1GMX
 

That and on the east coast much of the in coming goes though customs and
I've seen three weeks calendar time but a full 9 days of it was in customs.

Then again I also remember an order (NOT QRPL) that three months
(airmail!) three decades ago from another source from GB!  Every time
it hit the ground it sat for a week minimum. The idea of any where in
the world in days it nuts to me.

Allison
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Re: Polyphase board

ajparent1/KB1GMX
 

Have to ask.   How much bandwidth do you need?
 
Nearly 3000hz is wider than most filters used in SSB transmitters.
Most of mine are 2.1 and 2.4Khz and 2.8khz is considered wide.
Also despite your RX band width width the amount of transmitted
information is far more limited and you will not hear "more" other
than greater adjacent frequency interference that is within your
pass-band.


However you may need to alter C3-C6 to a lower value.  Try 33nF or 10nF
Reason for this is the  detectors are low pass in nature and those capacitors
are part of that.

I'd go on line and find a calc or spreadsheet for recalculating the values
before going there.  High order RC filters tend to have a lot of interaction.

If your using a computer to render audio from I&Q then the polyphase board
is not needed.

Allison
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Re: Shipping FAQ

Don Baker
 

Business Days are basically M - F so count the days and subtract weekends and bank/legal holidays. add up to a week for Covid slowdown.

Don
WB9STS

On Jun 6, 2020, at 11:59 AM, Glenn ODonnell <k3pp@...> wrote:

Thank you Hans!

My QCX80 (old school, not a QCX+ announced days after I ordered) shipped 29-April. It will be my third! I was in no hurry, so I chose the slow-poke cheapskate shipping. It still hasn't arrived, but I'm still within the USA window and I'm still in no hurry. As Don Baker (call?) says, "Chill" ... which is just what I'm doing. 

I sincerely appreciate all the work Hans puts into all of this! It's truly a remarkable commitment that is largely altruistic. He's hardly getting rich by selling $50 radios!

I will add my data point to the ship times once mine arrives. 

VY 73 de Glenn K3PP 


Re: QCX 40 meter build help, 700 HZ tone shows up in weird place... #40m #si5351a

Wes AE6ZM
 

Jim, that sure does happen. Personally I would make a first step to see what signal is present along the IC1-6 to IC3C trace. If the Tune signal shows up when touching a probe to points along this trace, then the problem is not IC1. Reflowing a tiny SMD device like IC1 has its own world of problematic consequences. That would not be my recommended first step. 

--
> I finally got it all together...now I can't remember where I put it<

VY 73,
Wes

AE6ZM

Sierra Vista, AZ

 


Polyphase board

Mike Hadley
 

Has anyone changed resistor values on this board to increase the bandwidth for better ssb recovery? 


Re: QCX 40 meter build help, 700 HZ tone shows up in weird place... #40m #si5351a

James Daldry W4JED
 

Hi, Mark

I would start by taking a fine solder pencil tip and reflowing the connections on IC1. It wouldn't be the first time I saw a leg on an SMD chip hanging a couple of thou above the foil, making like a tiny microswitch CW key.

73

Jim W4JED

On 6/5/20 10:50 PM, n8iaj via groups.io wrote:
Hi everyone!

      Thank you for the add.  I'm really excited about building my 40 meter QCX I ordered.  Got a problem that is perplexing me and I want to pose to the group.

I'm troubleshooting on why I do not have a 700 hz tone when I go to 8.7 BPF Alignment.  So I'm using a cheap DSO 150 scope and start tracing as by Han's troubleshooting video.  
Here is the weird part, Start 8.7 BPF alignment, plug in headphones,  I start at the source for the tone output, IC1 pin 6, I touch it with the probe - Tone comes on through earphones and my display jumps up to 10 and allows me to peak it at 11.  I remove the probe from the pin, it all stops and my display goes down to 3, no audio.

Has anyone out here come across this?  Of course, I've checked my solder joints and values of components.  All my IC's show correct voltages but no 700 hz tone on the pins.

I sincerely ask for any suggestions and thoughts on what I can do.  I know I'm so close to getting this on the air. Not to mention the cabinet I've been building for it.

Thanks for reading.

Mark