Date   

Re: Who owns the list of calls starting with Q #Balloon #20m

Hans Summers
 

Hi Dennis

I think you have misunderstood; the question is about balloon telemetry, the technique that I invented with collaboration from Dave VE3KCL for transmission of balloon telemetry over the WSPR network, and which was subsequently adopted with sometimes some variations, by other balloonists.  Details are here http://qrp-labs.com/flights/s4 . We have now moved on also to time and frequency multiplex, that multiplies the number of channels.

Rewarding the question, nobody "owns" balloon telemetry channels and nobody is in charge officially of allocating them. However it is of course polite to avoid "channels" that others are using and avoid interfering with their flights. I think the best way to do this is to look at recent WSPRnet data and choose a "channel" which has not been used for a while.

73 Hans G0UPL
http://qrp-labs.com

On Fri, Apr 30, 2021 at 7:40 PM Dennis Klipa <klipadk@...> wrote:
Tim,

That is a really odd question but:

1.  This is the wrong board for that question.  You should post it on the GPSL.io board.
2.  The FCC owns the call signs for use in the Amateur Bands.
3.  Ask Bill, WB8ELK.
4.  There are no amateur Call signs that begin with the letter Q, to the best of my knowledge.  I believe Australian CB call signs did start with Q at one time.
5.  Use a call sign for which you have the privilege to use on the designated frequency.  The unit transmits on 14.0956 MHz. Use your own call sign. General Class licensees can transmit on that frequency.

Best Regards,
Dennis, N8ERF


On Fri, Apr 30, 2021 at 11:57 AM Tim Wiwel <tim.wiwel@...> wrote:
We are looking to launch a pico balloon this weekend using a K1FM board.  Currently the board is programmed with Qx9xxxx.   Is anyone else currently using that call?  If so is there anything free that we can use?  Last yr WB8ELK built me a board and reserved a call but I do not recall which it was or how he reserved it.   

KM4EFW



--
Best Regards,
Dennis Klipa


Re: Who owns the list of calls starting with Q #Balloon #20m

Steve Kavanagh
 

There are no callsigns of any kind, amateur or otherwise, that start with Q.  Any such calls will be instantly recognizable as illegal.

73,
Steve VE3SMA


Re: Blown 78M05

Steve
 

You could use a 5v cell phone battery charger to temporarily substitute for the blown regulator section.  


On Friday, April 30, 2021, 12:14:54 PM EDT, Daimon Tilley <daimontilley@...> wrote:


Having sucessfully built my latest QCX Mini (for 40m) this week, I today blew a hole in the front of the 78M05 - not quite sure how, but I must have shorted something. It is a REV2 board and I have ordered some new regulators from eBay. It was not reverse polarity and that diode is still OK. The question is - am I likely to have damaged anything else, or do I need to wait until switch-on to find out? 

Only asking in case others have done this and found damage elsewhere - so I can order in any likely parts in advance.

Thanks.


Re: 50 Ohm Dummy Load Extension #dummyload #power meter #dummyload #power

Arv Evans <arvid.evans@...>
 

Very impressive. 

Arv
_._


On Thu, Apr 29, 2021 at 6:34 PM <jakob@...> wrote:
I recently built the 50 Ohm 20 Watt dummy load from QRP-Labs. It works well with very close to 50 Ohm on most of the ham frequency spectrum. But I was not satisfied by the fact that I need a voltmeter and a calculator when I want to use the power meter feature in the dummy load. So I grabbed my parts box and built a power meter extension. It can measure instant power, peak power and average power over about 2 minutes, selectable with the rotary encoder knob. Press it to reset the peak value detection. It is built with an Arduino Pro Mini 5 Volt, a .91 inch OLED display and a 16 bit AD convertor ADS1115. The battery is a rechargeable 9 Volt type, good for about 24 hour of run time per charge. The software does linearization by interpolation between set points to compensate for the non-linear characteristic of the power sensor diode. I plan to extend the program to add a calibration feature for all ham bands form 160 m to 70 cm and store the set points in the EEPROM of the Arduino. I will see how far up in frequency I can go with the built in 1N4004 diode in the dummy load. The enclosure is from Amazon. 



Re: Who owns the list of calls starting with Q #Balloon #20m

Dennis Klipa
 

Tim,

That is a really odd question but:

1.  This is the wrong board for that question.  You should post it on the GPSL.io board.
2.  The FCC owns the call signs for use in the Amateur Bands.
3.  Ask Bill, WB8ELK.
4.  There are no amateur Call signs that begin with the letter Q, to the best of my knowledge.  I believe Australian CB call signs did start with Q at one time.
5.  Use a call sign for which you have the privilege to use on the designated frequency.  The unit transmits on 14.0956 MHz. Use your own call sign. General Class licensees can transmit on that frequency.

Best Regards,
Dennis, N8ERF


On Fri, Apr 30, 2021 at 11:57 AM Tim Wiwel <tim.wiwel@...> wrote:
We are looking to launch a pico balloon this weekend using a K1FM board.  Currently the board is programmed with Qx9xxxx.   Is anyone else currently using that call?  If so is there anything free that we can use?  Last yr WB8ELK built me a board and reserved a call but I do not recall which it was or how he reserved it.   

KM4EFW



--
Best Regards,
Dennis Klipa


Blown 78M05

Daimon Tilley
 

Having sucessfully built my latest QCX Mini (for 40m) this week, I today blew a hole in the front of the 78M05 - not quite sure how, but I must have shorted something. It is a REV2 board and I have ordered some new regulators from eBay. It was not reverse polarity and that diode is still OK. The question is - am I likely to have damaged anything else, or do I need to wait until switch-on to find out? 

Only asking in case others have done this and found damage elsewhere - so I can order in any likely parts in advance.

Thanks.


Who owns the list of calls starting with Q #Balloon #20m

Tim Wiwel
 

We are looking to launch a pico balloon this weekend using a K1FM board.  Currently the board is programmed with Qx9xxxx.   Is anyone else currently using that call?  If so is there anything free that we can use?  Last yr WB8ELK built me a board and reserved a call but I do not recall which it was or how he reserved it.   

KM4EFW


Re: 50 Ohm Dummy Load Extension #dummyload #power meter #dummyload #power

jakob@...
 

Hi Vojtech. There are many commercially available power/SWR meters out there that I could buy, but that is not my point. I want to have fun building something useful for my own use, and if someone is interested to do something similar, I would be happy to share information. I am not in business for ham equipment, and I leave that to professionals like Hans. By the way, I got caught with a fake Chinese copy of the  Adafruit 16 bit AD converter ADS1115. It only converts 12 bits and leave 4 LSB zero. I got it from Amazon some time ago. Just a warning if you want to copy! Now I ordered replacement from Adafruit directly. I need these extra bits to obtain reasonable accuracy in the single bit dBm range.


OCXO/Si5351A Calibration/Testing...Wierd Failure!! #ocxo

Lee Hooper KG5VU
 

I assembled the OCXO kit a few weeks ago.  All seemed to go extremely well until I attempted to set the temperature of the crystal oven.  With the R21 potentiometer fully counterclockwise, the U3S functions as with the standard Si5351A module.  

When I advance the R21 to heat the crystal oven the power supply current begins to pulse rather dramatically at 1-2 second intervals.  The front panel display of the U3S generally goes blank or gives "startup" display. The frequency, monitored on my hf receiver, changes or sometimes the signal disappears completely (Probably the U3S is doing a restart).

I thought this might just be the power supply.  Tried an alternate power supply to no avail.  (I am powering the U3S thru Pin 2 and the heater transistors thru Pin 3 of the 11 pin connector at the bottom of the U3s board but both are connected to a common regulated power supply.). I have not tried using two completely separate power supplies... seems like this should not be necessary.

Has anyone encountered (and hopefully resolved) such a situation? 


Re: QCX in QSO on Youtube

Jim Ziegler
 

On Fri, 30 Apr 2021 06:34:09 -0700
"ON7DQ Luc" <on7dq@hotmail.com> wrote:

I think my QCX 40m at 5W and 33m random endfed antenna did a nice job.
How do you feed it, tuner?

--
Jim Ziegler 吳記明 <jim@jcz.us>


QCX in QSO on Youtube

ON7DQ Luc
 

During the last QCX Challenge, I had a nice QSO with Adam, SQ5VCO (but he was not using a QCX).
What I didn't know was that Adam recorded the QSO, to use it as an example in his CW Academy class.

With my permission, he made a nice video of it, making a full transcript of the QSO.
You can see/hear it here:
https://www.youtube.com/watch?v=xcrHEUxeNLw
Enjoy!
I think my QCX 40m at 5W and 33m random endfed antenna did a nice job.

73,
Luc ON7DQ


Re: Missing L6 from QCX-Mini?

Mike Easterbrook
 

Had same  problem sizing the 1n4148's.  Component spacing on top side of board wouldn't allow me to get the vernier calipers anywhere close. In the end guessed wrongly & ordered "323" size - much too small - spent a long time on hands & knees trying to retrieve "pinged" diodes.  Managed to solder them in somehow - works but doesn't look pretty.
Anyway rig powered up first time & Si5351 error is gone.  Everything working - 1.9W out at 12V.  After LPF tune-up a la Hans excellent video now giving 4.5W @ 12V & 5.7W @ 13.8V.

I would recommend anyone seeing Si5351 error check/change D1 & D2 before changing the Si5351. I assumed I was destroying the chip by overheating during my initial soldering attempts.  Probably several Si's that I've rejected after the first one were actually good!

It's been a long journey for this Christmas present but finally well worth the effort.
Mike

Virus-free. www.avg.com


Re: QRP Labs kit stocks update

k4aen@...
 

Thanks, Hans.  Great to know.

If Elecraft were only as transparent on their production and shipping!

VY 73

Tom
K4AEN


Re: 50 Ohm Dummy Load Extension #dummyload #power meter #dummyload #power

Vojtech Bubnik
 

Seeing your digital power meter, I would like to point to my self-powered Tayloe style digital power meter / SWR bridge design. The design is open and well documented and it IMHO a perfect companion to a small QRP rig that does not contain a SWR bridge.
BlinkySWR/manual-0.2-S.md at master · bubnikv/BlinkySWR (github.com)
Here is a picture of the prototype
bubnikv/BlinkySWR: Tiny, cheap, simple, accurate, self powered resistive SWR and power meter for SOTA and back packers (github.com)
and description of the design process
BlinkySWR/design at master · bubnikv/BlinkySWR (github.com)

I am not sure whether promotion of own products is allowed, I don't think I compete with any of Hans' products. If this is a problem, Hans please delete my post. The BlinkySWR could be purchased at BlinkySWR (remoteqth.com)
However the design is simple enough to be replicated. To be self powered, the LEDs need to be high intensity red ones and the linear regulator is quite special, it is a low quiescent current, low drop and high voltage type.

73, Vojtech OK1IAK


Re: QRP Labs update: business almost as usual

Hans Summers
 

Hi Ken

I already mentioned this in my stock update email that I sent right after the business almost as usual email... see http://qrp-labs.com/qlg2 for updates on QLG2. 

73 Hans G0UPL
http://qrp-labs.com

On Fri, Apr 30, 2021 at 8:32 AM KEN G4APB via groups.io <lfoofui.nbz42=ntlworld.com@groups.io> wrote:
Hi Hans,
any update on shipping of the QLG2 units please?
Stay safe and well.
Ken G4APB


Re: QRP Labs update: business almost as usual

KEN G4APB
 

Hi Hans,
any update on shipping of the QLG2 units please?
Stay safe and well.
Ken G4APB


Re: QSX on 6m instead of 160m?

NQ5P
 

FYI, the Ham is M0GBZ, and his modifications and results are on the QRP-Labs BPF (receiver) kit page, https://www.qrp-labs.com/bpfkit.html.


Re: #case QCX+ #case

wa8yan.radio
 

Looks really nice.  I'd be tempted to buy one but I dont have a 3d printer so can't make my own.



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: oe7mbt@...
Date: 4/29/21 9:44 AM (GMT-05:00)
To: QRPLabs@groups.io
Subject: [QRPLabs] #case QCX+

Hi Community...

I'm trying to design my own case for the QCX +. I like custom and personalized enclosures for my projects.

It is not finished yet ....

https://www.prusaprinters.org/de/prints/65299-qrp-labs-qcx-plus-housing/files

73 de Marco, OE7MBT


Re: QSX on 6m instead of 160m?

Curt wb8yyy
 

Well the vertical here is 36 feet tall and the longest radials are 50 feet. It reaches thousands of miles, you might be able to do better. 

For qsx maybe the PA and TR switching might be the limit. If Hans firmware can support it a few builders could go for some more extravagant substitution. As for field or small home station use, certainly it will be a lot of rig if its mostly used across 40 to 10 meters. Maybe buy a second one to mod for use only on 6 meters or just the upper bands. 

Expect adaptability and remember first release may begin as a monoband rig.

Curt


Re: 50 Ohm Dummy Load Extension #dummyload #power meter #dummyload #power

William Jenrick
 

Sweet, Ill buy one!!!

On Thu, Apr 29, 2021 at 5:34 PM <jakob@...> wrote:
I recently built the 50 Ohm 20 Watt dummy load from QRP-Labs. It works well with very close to 50 Ohm on most of the ham frequency spectrum. But I was not satisfied by the fact that I need a voltmeter and a calculator when I want to use the power meter feature in the dummy load. So I grabbed my parts box and built a power meter extension. It can measure instant power, peak power and average power over about 2 minutes, selectable with the rotary encoder knob. Press it to reset the peak value detection. It is built with an Arduino Pro Mini 5 Volt, a .91 inch OLED display and a 16 bit AD convertor ADS1115. The battery is a rechargeable 9 Volt type, good for about 24 hour of run time per charge. The software does linearization by interpolation between set points to compensate for the non-linear characteristic of the power sensor diode. I plan to extend the program to add a calibration feature for all ham bands form 160 m to 70 cm and store the set points in the EEPROM of the Arduino. I will see how far up in frequency I can go with the built in 1N4004 diode in the dummy load. The enclosure is from Amazon. 




--
William Jenrick 

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