Date   

Re: Careless WSPR

Alan G4ZFQ
 

It is almost like something is aligning or settling down
I wondered if anyone else can shed light on it?
Ted,

The easiest way to know is if you monitor your transmission yourself.
Have you got a receiver?

73 Alan G4ZFQ


Re: Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

Steven Dick
 

Previously posted link expired.  Talk was uploaded to Youtube by the presenters and official link is at:

https://www.youtube.com/watch?v=DLZ0HKhEoCM&feature=youtu.be

-Steve K1RF

------ Original Message ------
From: "mike mccarthy" <mikemccarthy_50@...>
Sent: 2/10/2021 6:37:00 AM
Subject: Re: [QRPLabs] Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

Thank you Steve,  I do appreciate you getting in touch and  sending me the link.  I had rearranged my week to be able to be at home to watch it and was feeling frustrated when after getting linked on time, there was a general talk on radio but not about improving morse.  I made a long night of it and used your link to youtube,  it was very worth while.

I think I may get in touch with them to try and improve my CW.

                               Best Wishes,  Mike

Sent from Mail for Windows 10

 

From: Steven Dick
Sent: 09 February 2021 22:34
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

 

I had the same problem.  It didn't start automatically.  I found you had to refresh your browser after it started and then it worked.  Sorry you missed it. It was an excellent presen
However, it IS available for re-watching on youtube at:

https://www.youtube.com/watch?v=0QSeuNQae4E

Their website is at https://longislandcwclub.org/  1314 members, 50 states, 25 countries, 75 classes. It's a large and enthusiastic organization. 

 

-Steve K1RF

 

------ Original Message ------

From: "Mont Pierce KM6WT" <de.km6wt@...>

Sent: 2/9/2021 3:14:45 PM

Subject: Re: [QRPLabs] Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

 

On Mon, Feb 8, 2021 at 06:03 AM, Trystan G0KAY wrote:

Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

what happened ?   :(

I've been sitting on YouTube waiting for about 10 minutes... never started.

YouTube screen just changed to "This video is unavailable".

Hopefully, if it does go on, will it be recorded so we can watch it offline ?


tnx & 73
km6wt

 

Virus-free. www.avast.com

 


Re: Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

mike mccarthy
 

Thank you Steve,  I do appreciate you getting in touch and  sending me the link.  I had rearranged my week to be able to be at home to watch it and was feeling frustrated when after getting linked on time, there was a general talk on radio but not about improving morse.  I made a long night of it and used your link to youtube,  it was very worth while.

I think I may get in touch with them to try and improve my CW.

                               Best Wishes,  Mike

Sent from Mail for Windows 10

 

From: Steven Dick
Sent: 09 February 2021 22:34
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

 

I had the same problem.  It didn't start automatically.  I found you had to refresh your browser after it started and then it worked.  Sorry you missed it. It was an excellent presen
However, it IS available for re-watching on youtube at:

https://www.youtube.com/watch?v=0QSeuNQae4E

Their website is at https://longislandcwclub.org/  1314 members, 50 states, 25 countries, 75 classes. It's a large and enthusiastic organization. 

 

-Steve K1RF

 

------ Original Message ------

From: "Mont Pierce KM6WT" <de.km6wt@...>

Sent: 2/9/2021 3:14:45 PM

Subject: Re: [QRPLabs] Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

 

On Mon, Feb 8, 2021 at 06:03 AM, Trystan G0KAY wrote:

Talk: 8pm UTC, Tues 9th Feb - Long Island CW Club - learning and improving morse code for all

what happened ?   :(

I've been sitting on YouTube waiting for about 10 minutes... never started.

YouTube screen just changed to "This video is unavailable".

Hopefully, if it does go on, will it be recorded so we can watch it offline ?


tnx & 73
km6wt

 

Virus-free. www.avast.com

 


Re: QCX for 2m VHF? #mods #vhf #qcx #chat

Jim Mcilroy
 

Jim

When I got my ticket back in the 70s everybody I knew at my local club knew how to build and use stuff, and was very interested in doing so. The exam was a written one, and as far as I can recall there were few multiple choice questions, and various questions about valves.

I do recognise these days at my local club that there are a significant number of hams who are only interested in operating gear and their eyes glaze over a bit when backs get taken off radios and soldering irons get fired up. One hopes they will grow out of their fears and get more out of their respective ham worlds.

Nevertheless everyone had to do an exam and surely some of that knowledge must get taken on board. I can see you have reservations about that.

I am generally in agreement with your last paragraph and it is much easier to build at higher frequencies these days. A good quality BNC connector will work up to about 3.5 GHz. I used to work at a microwave components factory and would measure anything I could get my hands on. Prior to that I cut my teeth on GAT-5 and GAT-6 transistors working at 8 GHz for satellite comms and they were tricky to match and easier to blow up. Had steadier hands then.

So, yeah, we agree on some things.

I noticed your other post about a simple 2m CW rig. Good idea. Not so simple for many to do a prototype but double sided copper sheets would be your friend.

I also have a Datong PC1 in my junk box that I bought in a lot as scrap. I intended just to use the box but I notice that it has a parametric mixer and a 144MHz filter. I'm sure I could have some fun with that.

Also have a couple of Avala PCBs which were the forerunners for the Genesis SDRs. They are intended for HF but they are easy to work on and could possibly be integrated with 2m VHF components. That would have to be a downconverter design as the mixer chips are 74HC4066s. Not as good as the QCX design but probably pretty good at 40m. Later on we'll see.

Jim

On 10/02/2021 08:41, Jim Allyn - N7JA wrote:
On Mon, Feb 8, 2021 at 09:51 AM, Jim Mcilroy wrote:
I must confess that I assumed that most hams would know the distinct differences between HF and VHF design and construction.
I don't know why you would assume that.  Clearly the original poster didn't know the differences between HF and VHF design and construction, else he wouldn't have asked, "Would the QCX design not be able to make an VHF version?"  Maybe things are different where you live, but here in the United States, it seems to me that a significant number of hams, perhaps a majority, don't know the difference between HF and VHF.  I have heard lots of US hams admit that they know basically nothing: in their own words, they just memorized enough questions and answers to pass the test, then promptly forgot everything.  An example of how much some hams here (don't) know:  within the last year or so, I heard a discussion on one of the local repeaters about baluns.  One of the guys wanted to know what kind of balun he needed: "I see there are one to one baluns, and four to one baluns, and nine to one baluns.  How do I know which one I need?"  The answer he received was, "If you want to operate on one band, you need a one to one balun.  If you want to operate on four bands, you need a four to one balun.  If you want to operate on nine bands, you need a nine to one balun."  I looked up the gentleman who gave that answer on QRZ.com, and he holds an Extra Class license.  I'll leave it to you to consider whether that gentleman is likely to know much about the differences between HF and VHF design and construction.

On the other hand, one could argue that there is no difference between HF and VHF design and construction.  The principles are the same: keep all component leads and signal paths as short as possible, minimize the loop area circumscribed by the signal paths and their return paths, keep different types of signals (analog and digital, for example) away from each other, ensure that bypass capacitors have a low impedance at the design frequency, and so on.  The differences are in the details.  Practically speaking, an inch of wire doesn't exist in a circuit designed for 80 meters, at 70 centimeters that same piece of wire is a fairly large inductor.


Careless WSPR

Ted 2E0THH
 

I have been experimenting with WSPR for a couple of years now on 40m with my QCX classic and most recently with my new fabulous Mini.

I have experienced a very curious condition when the rig has been off or I have been using it for QSOs. I am finding when returning to WSPR it seems to take a period of time before the rig is "discovered" again by receiving stations.

For instance, last night after powering up, nothing for over 2 hours and then they all piled in.
For WSPR, the rig is running with a GPS permanently attached for discipline, and I have the frequency set bang in the middle of the 40m WSPR band at 7.040100.

It is almost like something is aligning or settling down but I can't put my finger on it. I have a vague notion I have read of something similar some time back on here.

I wondered if anyone else can shed light on it?

73s Ted
2E0THH


Re: Trying to understand differential heating issues of PA Fets in QCX40

Alan G4ZFQ
 

The GM3SBC BS170 matcher
*s*harpie, scratch, etch
I almost always scratch.
Of course the matcher is only for perfectionists using the BS170 in linear modes.

73 Alan G4ZFQ


Re: Trying to understand differential heating issues of PA Fets in QCX40

Alan G4ZFQ
 

Running the QCX40 as a WSPR beacon overnight at a feeble 7.5 volts still
Tony,

That must be around 1 watt which is not really feeble where WSPR is concerned:-) It's the most I ever use although there is a case for more on 80m and below.

Note that the VK is long path. (Assuming it was this morning.)

73 Alan G4ZFQ


Re: First purchase QCX+ 40M

Roger Nolter <rnolter@...>
 

Bruce

Thank you very much!  Looking forward to building and using this kit a lot. I did buy the case with it and will checkout what you sent. Thanks!!

73
Roger
KG4MQF 


On Feb 9, 2021, at 1:01 PM, Bruce K1FFX <rosen.bruce@...> wrote:

Hi, Roger -

Congrats!

1. Follow the instructions in the build manual carefully.
2. Take it slow.
3. Following the instructions will get you easily through step 1, which is winding T1.  I found that
hand drawing of which leads go where to be invaluable.
4. See hints on the QRP Labs Builders page on Facebook (and may also have been posted here) about
assembling the front panel, if you have also purchased the QRP Labs case.
5. See the video which Hans posted on YouTube about optimizing output power (although less relevant
for the 40m version ... might not be needed)

It's a really enjoyable build ... I've done two of them (40m and 20m), without a hitch.

Good luck!

Cheers -

Bruce K1FFX


Re: Trying to understand differential heating issues of PA Fets in QCX40

tony.volpe.1951@...
 

Running the QCX40 as a WSPR beacon overnight at a feeble 7.5 volts still brings in some good spots. The Antarctic and Australian spots were around -25 to -27db with one at -32db snr out of the five spots. The receiving sites are of course both in a very low noise environment to be fair, so they are doing most of the work at the receiving end.

Still a nice sight to wake up to in the morning.

Tony - G0BZB


Re: QCX for 2m VHF? #mods #vhf #qcx #chat

Evan Hand
 

An off-topic idea (not based on QCX) might be to convert a cheap (Baofeng) FM transceiver to CW.  They can be had for less than $30 US.  Could be as simple as a code practice oscillator input into the mic.  Could be to modify the modulator to not deviate the frequency and supply a local IF level oscillator to get the tone.

Just an out of the box (and again OFF-TOPIC) thought.

Please excuse the message, I just could not help myself.
73
Evan
AC9TU


Re: QCX for 2m VHF? #mods #vhf #qcx #chat

Jim Allyn - N7JA
 

I like the idea of practicing CW with the local hams on VHF.  A couple of hams locally have been practicing CW with each other on 20 meters.  For a good portion of the day, they can be head over a considerable area.  CW practice on 2 meters avoids that.  A small, inexpensive, low power 2 meter CW transceiver would be great for code practice with the locals.


Re: QCX for 2m VHF? #mods #vhf #qcx #chat

Jim Allyn - N7JA
 

On Mon, Feb 8, 2021 at 09:51 AM, Jim Mcilroy wrote:
I must confess that I assumed that most hams would know the distinct differences between HF and VHF design and construction.
I don't know why you would assume that.  Clearly the original poster didn't know the differences between HF and VHF design and construction, else he wouldn't have asked, "Would the QCX design not be able to make an VHF version?"  Maybe things are different where you live, but here in the United States, it seems to me that a significant number of hams, perhaps a majority, don't know the difference between HF and VHF.  I have heard lots of US hams admit that they know basically nothing: in their own words, they just memorized enough questions and answers to pass the test, then promptly forgot everything.  An example of how much some hams here (don't) know:  within the last year or so, I heard a discussion on one of the local repeaters about baluns.  One of the guys wanted to know what kind of balun he needed: "I see there are one to one baluns, and four to one baluns, and nine to one baluns.  How do I know which one I need?"  The answer he received was, "If you want to operate on one band, you need a one to one balun.  If you want to operate on four bands, you need a four to one balun.  If you want to operate on nine bands, you need a nine to one balun."  I looked up the gentleman who gave that answer on QRZ.com, and he holds an Extra Class license.  I'll leave it to you to consider whether that gentleman is likely to know much about the differences between HF and VHF design and construction.

On the other hand, one could argue that there is no difference between HF and VHF design and construction.  The principles are the same: keep all component leads and signal paths as short as possible, minimize the loop area circumscribed by the signal paths and their return paths, keep different types of signals (analog and digital, for example) away from each other, ensure that bypass capacitors have a low impedance at the design frequency, and so on.  The differences are in the details.  Practically speaking, an inch of wire doesn't exist in a circuit designed for 80 meters, at 70 centimeters that same piece of wire is a fairly large inductor.


Re: Trying to understand differential heating issues of PA Fets in QCX40

Steve Rawlings
 

I am very grateful to Marc PA1DMG for taking the time to summarise, most clearly, the reason for not needing to include balancing mechanisms when using FETs in parallel.

I have now found an NXP (Nexperia) application note on the subject that can be found at:
https://assets.nexperia.com/documents/application-note/AN11599.pdf

The application note tends to confirm Marc's summary, and also emphasises the importance of ensuring that all the FETs are operated at the same temperature to derive maximum benefit from the positive temperature coefficient of FETs.

The application note does mention the use of gate resistors and source resistors to assist balanced operation in some applications.  If I were suspecting poor current sharing in my FET PA, I'd still be tempted to experiment with source resistors -- if only to provide convenient test points.

A fascinating topic.  Like Tony, I am very grateful to all the contributors for their comments, and the lessons!

Regards to all,
Steve


Re: First purchase QCX+ 40M

Mont Pierce KM6WT
 

On Tue, Feb 9, 2021 at 02:38 PM, Steve in Okinawa wrote:
Noooo! You might be surprised by how much current a fresh 9-volt battery can put into a short circuit. Use a series resistor.
Very good point on fresh battery...

Myself, I use a run down 9V battery to start with. 
But I also like the idea to use a resistor to limit current.

73,
km6wt


Re: Will a mini with TCXO do WSPR?

MVS Sarma
 

Should do, but wspr is also linked to world standard time of dat in utc . If the rig has that facility , why not. 

Regards
Sarma vu3zmv



On Wed, 10 Feb 2021, 1:43 am Michael Greene, <kn6ize@...> wrote:
Mine does WSPR just fine but you need to change the frequency settings in the alignment menu. See that section of the manual.


Re: QLG1 retirement; new QLG2 module provides many improvements

Hans Summers
 

Hi Anthony

Will the discontinuation of the QLG1 effect outstanding orders? I've ordered a couple of kits that were delayed (e.g. QCX+) until mid February but now everything seems back in stock except the QLG1. Will my entire order now be delayed until QLG2 is in stock?

No. We have reserved enough stock of QLG1 to fulfill all existing pending orders that included QLG1. There may be a stock counting error that may mean +/- a couple QLG1 but in general the theory is, that there are enough QLG1. So don't worry.

73 Hans G0UPL 


Re: QLG1 retirement; new QLG2 module provides many improvements

AnCa
 

Will the discontinuation of the QLG1 effect outstanding orders? I've ordered a couple of kits that were delayed (e.g. QCX+) until mid February but now everything seems back in stock except the QLG1. Will my entire order now be delayed until QLG2 is in stock?


Re: First purchase QCX+ 40M

Greg Winterflood VK8MD
 

PS: I live 1,000 miles in any direction from a large urban centre. I was surprised to find the little jig in the photo.  It was in the lone hobbyist electronics store in Alice Springs. I was more surprised to find it was only $19AUD given that 'transport' usually increases prices steeply. The jig was also suggested somewhere on this site. [Again, thank you!] It has been a wonderful aid for this 73 year old who only has one working eye. Populating the board on the component side and then flipping it over is a breeze. Highly recommended if you can get one.

73 Greg
---
Greg Winterflood VK8KMD
Alice Springs, Central Australia
PG66wh


Re: First purchase QCX+ 40M

Greg Winterflood VK8MD
 

Bruce, I am about half way through putting my first QCX+ 30metre kit together.

I had noted that many people complain about trouble assembling T1 and had seen a hint on this site which I followed. [I've lost track of where or who posted it, but thank you very much!]

I first wound the large winding and put both ends through holes 1 and 2 on the PCB, loosely twisting the ends together to more or less hold the toroid in place.

I then wound the three smaller windings by bringing the wire up through an outside hole in the PCB and over the top and under the toroid to make enough passes for my 30 meter build before sending the wire through the appropriate inside hole to be soldered in place underneath the PCB.   

There was some jiggling involved, but doing it that way was so easy that no expletives were necessary ;-)

73, Greg
--
Greg Winterflood VK8KMD
Alice Springs, Central Australia
PG66wh


Re: Will a mini with TCXO do WSPR?

Mont Pierce KM6WT
 

On Tue, Feb 9, 2021 at 03:27 PM, Mont Pierce KM6WT wrote:
2) Set the time EACH time the QCX+ is turned on.
Naturally, this is true for all QCX line, QCX, QCX+, and QCX-mini


73
km6wt

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