Date   

Re: New kit: 50W PA for QCX

Curt wb8yyy
 

Jerry

FB. You will enjoy the k2 running 10w on cw, and as we get sunspots you can hop oceans on ssb. I confess at the time the kpa100 was my best route to dx on 80m. I agree $650 is nearly enough for a ic7300 or part way to another rig. Hang in there and enjoy whatever rig is in front of you. Maybe visit a club field day this weekend to operate something different. 

73 Curt


Machine IC socket

Leland L. Bahr
 

I got my mini yesterday.  In case anyone wants to know a machine IC socket will work.  The length and width are the same as a punched socket but the height is actually lower then a punched socket.

Lee, w0vt


Re: Just completed a QCX Mini 20M build #20m

 

Agreed, in fact just about everything we do is humorous, and almost by definition, because it has no purpose outside itself, and every element of it can be achieved in simpler and more effective ways. Any time you describe to a youth of today what we do, he or she will look at you as if you're mad. They'd ask "why in heavens name would you ... [insert any activity associated with amateur radio!] " then laugh, and go back to staring at their mobile phones.
--
Julian, N4JO.


Re: Just completed a QCX Mini 20M build #20m

Arv Evans <arvid.evans@...>
 

Yes!  Some of the things we do or say in the name of Ham Radio
seem to be quite humorous.   8-)


On Tue, Jun 22, 2021 at 4:38 PM Julian N4JO <n4jo@...> wrote:
Of course!
In the name of humor...
but you're off the clock now, aren't you?
--
Julian, N4JO.


Re: Just completed a QCX Mini 20M build #20m

 

Of course!
In the name of humor...
but you're off the clock now, aren't you?
--
Julian, N4JO.


Completed 50 Watt PA, but...

Mitchel Sayare
 

Took a couple of days, but finished the 20 meter 50 W PA and it works well. Inputting the approx 4-watt signal from my OCX mini (powered by 12 V DC supply) I get about 15 watts from the PA (powered by 13.6 VDC supply), in the ballpark of what it should produce. HOWEVER, R3, a 2-watt 22-ohm resistor in the input attenuator circuit gets very very hot--too hot to touch. I did a WSPR transmission and it started to turn color. There's a 6 or 7 VRMS drop across it, yielding more than 1.5 watts. I think this accounts for the heat, but I'm wondering if this is the way it's supposed to be. Perhaps it's not built for the 100% duty cycle of WSPR for 2 minutes, or maybe I did something wrong. Any thoughts would be appreciated (and answered). Many thanks. Mitch NK3H


Re: Just completed a QCX Mini 20M build #20m

Ward Merdes
 

Information bias.

On Tue, Jun 22, 2021 at 2:11 PM Julian N4JO <n4jo@...> wrote:
Come now, you know the answer to that... ;-)
We always want what we may not be/are not able to have, or that we risk losing.
Anybody who has ever loved somebody knows that - especially those of us who have been forced to choose between two...
And yes, there's a story behind that observation...
--
Julian, N4JO.

--
WMM
--
Ward Merdes
% MERDES LAW OFFICE, P.C.
P.O. Box 71309
Fairbanks, AK 99707-1309
(907) 452-5400
(907) 452-8879 (f)
***Board Certified Alaskan Personal Injury Attorneys***
This email is confidential and may contain attorney/client and work-product content. If you are not its intended recipient, please return this email to us, accept our apologies for the misdirection, and destroy all copies. The Statute of Limitations for injury/death to an adult is two years in Alaska. Thank you.


Re: Arduino connection to ProgRock

Syd
 

Hans
  After monkeying around I think I got it! Copy and paste the source code, SoftWareSerial, from the manual into a new sketch. Verify, compile and then upload into the Arduino. Having the ProgRock up and running before executing the code might be a nice idea, as well as using 4 on the DIP switch to enable serial data communication when the ProgRock is powered up. The TeraTerm software might be nice to experiment with in the future, but I think what you gave me is the simplest way to go for now! I did try the blink example and that's where I figured out how to compile, and upload to Arduino.
73 wt1v


Re: Just completed a QCX Mini 20M build #20m

 

Come now, you know the answer to that... ;-)
We always want what we may not be/are not able to have, or that we risk losing.
Anybody who has ever loved somebody knows that - especially those of us who have been forced to choose between two...
And yes, there's a story behind that observation...
--
Julian, N4JO.


Re: New kit: 50W PA for QCX

jerry@tr2.com
 

Did you catch the price of the KPA? $650... That's a lot for
100W. I was looking at it because I just scored a QRP K2 transceiver on Ebay.

- Jerry KF6VB

On 2021-06-22 13:12, wb8yyy via groups.io wrote:
i suspect so with careful tuning. Take a look at the 100 watt PA for
the K2, maybe its called the KPA - anyway the assembly manual has a
schematic and parts list. the 10/12m and 15/17m filters are shared as
I recall. But please note its the combination of filter response and
the amplifier bias that allows meeting harmonic regulations.
73 Curt
Links:
------
[1] https://groups.io/g/QRPLabs/message/67617
[2] https://groups.io/mt/68271457/243852
[3] https://groups.io/g/QRPLabs/post
[4] https://groups.io/g/QRPLabs/editsub/243852
[5] https://groups.io/g/QRPLabs/leave/10312280/243852/1190336630/xyzzy


Re: Just completed a QCX Mini 20M build #20m

Arv Evans <arvid.evans@...>
 

Jerry

Because it is just too easy to make contacts at the top
of the sunspot cycle.    8-)

Arv
_._


On Tue, Jun 22, 2021 at 2:18 PM jerry@... <jerry@...> wrote:
This brings up a question that has been bothering me, and surely has no
answer:

   "Why does my interest in Amateur Radio always peak at the bottom of
the sunspot cycle?"

                   - Jerry KF6VB

On 2021-06-22 11:33, Ed Kwik via groups.io wrote:
> You might want to factor in where we are in the current sun spot
> cycle.  30 meters at 10:00 PM my not be so good.  MUF will dip below
> 10 MHz and even 7 MHz late at night with low sun spots.  IMHO 80
> meters would be the best bet at 10:00 PM.
> Ed
> AB8DF
>
>
>






Re: Arduino connection to ProgRock

Mont Pierce KM6WT
 

On Tue, Jun 22, 2021 at 08:46 AM, Hans Summers wrote:
 
In order for the PC to talk the ProgRock you need something to convert between 9600-baud serial data and USB. You can buy little boards for a few $. OR, you can program an Arduino to do the job. In order to program the Arduino to do the job, you have to upload a certain sketch into the Arduino, using the Arduino IDE.
Hi Syd,

As Hans mentions, yes, you can use an Arduino, but as he says, it requires loading the sketch into the Arduino IDE, and then programming the Arduino board.  The Arduino might be a good option for those who are already playing with Arduino programming and have a couple of boards laying around...  But not the best choice if you have to buy something just to convert USB to TTL Serial...

The little boards Hans mentions that convert USB to TTL Serial are cheaper, and easier to hookup and use.
Here's an example of one for about $6 on Amazon (click here).  You can also use it to power the ProgRock.

Also, PuTTY is a much better terminal program than the Arduino Monitor utility...\

When I tried the Arduino monitor, it just shows everything on one long concatenated line...
(I probably don't have it configured right, but cannot see where to change it...)


73,
km6wt


Re: Arduino connection to ProgRock

Arv Evans <arvid.evans@...>
 

Did you first check the voltage put out by your VOM or DVM  when set to ohms
to ensure that you are not damaging components with over-voltage from the meter?

Arv
_._


On Tue, Jun 22, 2021 at 8:19 AM Syd via groups.io <nhuq1=yahoo.com@groups.io> wrote:
The DIP is set for serial mode, and just to make sure I set the correct switch I ohmed the uProc pin to gnd to ascertain the correct DIP switch was set.


Re: QCX-mini failure on new build

Mont Pierce KM6WT
 

On Tue, Jun 22, 2021 at 10:26 AM, Timothy Freeze wrote:
BTW, did you mention whether this is a Rev 1 or Rev 2 PCB ??
       Rev 2, brand new kit I've only had for about 2 weeks.
That's good news. Less to worry about since Hans worked out some of the manufacturing kinks, and now has a test jig to run the boards through their paces before shipping.  (Very Well Appreciated Hans !!! )

 
Please let me know what you recommend I do.  Very encouraging just to get some output.

Did you do the tests in my previous post?  And could you hear a signal on Si5351a's output frequency?
If yes, also indicates that the processor IS running, as it also has been able to communicate with the Si5351.

If the previous tests were successful, next I would test the connectivity between the IC2 socket, and the LCD.
Do the following with the Mini unplugged and with no external connections.:
    Remove the LCD board
    Remove the IC2 ATMEGA328 and set it aside.
    Plug the LCD board back into the main board.

    Turn the Mini up-side-down, and locate the following pins on the IC2 sockets' pins sticking out the bottom of the PCB.
     Locate pins 2,3,4, and 5.  These are the data pins going to the LCD.

     On the LCD at the top edge of the board where you soldered the two boards together, locate the pads for D4, D5, D6 and D7

     Stand the Mini up on it's bottom edge, and
     with ohm meter, DVM, or continuity checker, very that
          (  note: D0-D3 on the LCD are not used, but, still include them in the "Not connected" testing)
          IC2 pin 2   is connected  to  LCD pad "D4", also verify its NOT connected to D0, D1, D2, D3, D5, D6 or D7
          IC2 pin 3   is connected  to  LCD pad "D5", also verify its NOT connected to D0, D1, D2, D3, D4, D6 or D7
          IC2 pin 4   is connected  to  LCD pad "D6", also verify its NOT connected to D0, D1, D2, D3, D4, D6 or D7
          IC2 pin 5   is connected  to  LCD pad "D7", also verify its NOT connected to D0, D1, D2, D3, D4, D5 or D6


Another test you can do is connect the Mini's display board up to any other QRP Labs product that uses the 1602 display.  You will need to look at the schematics to see the pinout on the Mini's header/socket, and use Dupont styled breadboard jumber wires to connect them together.

I really like the way Hans used sockets on the VFO/SigGen, Clock, U3S kits for the LCDs...  On the QCX line there just wasn't enough room to put the 16 pin socket...   Amazing really how compact Hans design for the QCX-mini.


73,
km6wt


Re: New kit: 50W PA for QCX

Curt wb8yyy
 

i suspect so with careful tuning.  Take a look at the 100 watt PA for the K2, maybe its called the KPA - anyway the assembly manual has a schematic and parts list.  the 10/12m and 15/17m filters are shared as I recall.  But please note its the combination of filter response and the amplifier bias that allows meeting harmonic regulations.  

73 Curt


Re: Just completed a QCX Mini 20M build #20m

jerry@tr2.com
 

This brings up a question that has been bothering me, and surely has no answer:

"Why does my interest in Amateur Radio always peak at the bottom of the sunspot cycle?"

- Jerry KF6VB

On 2021-06-22 11:33, Ed Kwik via groups.io wrote:
You might want to factor in where we are in the current sun spot
cycle. 30 meters at 10:00 PM my not be so good. MUF will dip below
10 MHz and even 7 MHz late at night with low sun spots. IMHO 80
meters would be the best bet at 10:00 PM.
Ed
AB8DF


Re: Just completed a QCX Mini 20M build #20m

 

That's a good point. Even though things are beginning to improve by all accounts, we're certainly not "there" yet.

Well again, I have an 84ft random wire up at about 20 to 25 ft that'll work for 80m and up, and even though I'm not going planning on doing voice yet, I can still use my IC-7000 for those bands, now that I have a tuner for it. Even if it's mostly local nets, at least it's better than nothing.

So I'm set for 20 and 40 (and soon 30) at QRP, which will work for my planned motorcycle jaunts, and with the PS I have for the 7000 I can probably put in 50W DC at the home base if I need to. Now there's a plan :-)

 

--
Julian, N4JO.


Re: Just completed a QCX Mini 20M build #20m

 

Yup, I'm sure just listening to real CW in real conversations will give me experience with the humanized CW cadences, and give me exposure to words. My new multi-band EFHS should arrive tomorrow, and I'll get it up this weekend. It'll be interesting to see if I get better performance than my 85ft random...

--
Julian, N4JO.


Re: Just completed a QCX Mini 20M build #20m

Ed Kwik
 

You might want to factor in where we are in the current sun spot cycle. 30 meters at 10:00 PM my not be so good. MUF will dip below 10 MHz and even 7 MHz late at night with low sun spots. IMHO 80 meters would be the best bet at 10:00 PM.
Ed
AB8DF


Re: Just completed a QCX Mini 20M build #20m

jerry@tr2.com
 

On 2021-06-21 23:33, VK5EEE wrote:
Jerry, unless I misunderstood, you are now at cWPM 30 and eWPM 20 and
"faster than needed for QSO"
*** More like "faster than I would dare on a QSO".

close the gap at
20/20 get rid of Farnsworth as it is no longer needed, then work your
way up to 21/21, 22/22 etc?
*** I like 30WPM characters. Because at that speed, you can't count the dits - your mind HAS to train itself to recognize the
rhythms.

I did get up to 22WPM ( no Farnsworth ) in the mid-80's. I had a code practice program that ran on my TRS-80 computer. Took the Extra with code - having gotten to 22, 20 was easy.

I'd like to get to 30 for real - some day. I am using LCWO.net to learn to mill copy. Since I type something like 90WPM, 30 should be doable.

I see two things in my way - 1. Knowing the individual characters so solidly that you NEVER mistake them. 2. Getting
a "queue discipline" working - where you are typing a few characters behind. Because you cannot type the current char - you don't know what it is, till it's done. And then you must type that char WHILE another char is coming in.

- Jerry







On 21 Jun 2021, at 16:28, jerry@tr2.com wrote:
All,
I am seriously working on spiffing up my CW. Right now, I start
off
most mornings with lcwo.net [1]. Am doing morse machine and code
groups at
effective 20WPM and character speed 30WPM. These are far faster
than I
would attempt for a QSO.
I warm up with the "morse machine". I like it because there is no
pressure.
It sends a character, waits for you to copy it, then sends another
character. So
the effective speed is very slow, but you learn to recognize the
rhythms inside
the characters.
Then I go to the code groups. Right now, I'm running about 95%
accuracy at
20WPM effective. When it gets to 100%, I'll bump it to 21WPM...
- Jerry KF6VB
On 2021-06-21 08:44, VK5EEE wrote:
That's all great!
eWPM meaning "effective" words per minute, so the actual words per
minute, which is lower, due to the gaps. You can, for a few minutes,
increase the speed eWPM and even cWPM a little, to make it harder,
so
that when you then decrease to what you are at generally, a few
minutes later, it will seem much easier and slower than it actually
is.
The reason I say not to go higher than 15 cWPM (character speed) is
this: if you go lower than that, as you know, you'll end up maybe
"counting" things. But, if you go higher, you aren't going to get to
send in QSO at 20/20 cWPM/eWPM are you? Isn't that a bit of a tall
order? As you said, sending 20/15 won't sound right to people, so
for
that reason, you want to get to 15/15 first, as you gradually
increase
the eWPM (meaning decrease the gaps between characters). You don't
want to reach 20/15 and then take longer to get to 20/20.
15WPM (15/15) is plenty for QSO. So keep character speed cWPM at 15.
And just work on increasing eWPM (effective or actual words per
minute) also to 15, eventually.
Are you good at trouble shooting QCX in other words, tracing where a
fault is in no TX or no RX? Reason I ask is that I'm going to need
some help, ideally at agreed times on video link, as I'm OK
building,
but hopeless at finding cause of faults. If you can assist with that
then I could also before or after, or at alternate sessions, assist
with your CW. How we can do the CW practice though isn't via video
link as such, but via audio, or via "Mumble" server (quite easy to
set
up, it's a downloadable app), where there is a "CW server" with good
features, so I could send to you with QCX side tone and you can
reply
same way.
Just an idea as I'll have time I think from early July, until then
things are a bit stressful.
The reason a lot of people learn CW at these high speeds is because
they're really aiming to recognise short burts of sound (sometimes
aided by decoders) for callsigns and contests or "DX 5NN TU", none
of
which I find very satisfying. For actual "real" QSO as you know
these
take place for the most part between 15-20 WPM, and many above 20
WPM
but fewer as the speed goes higher, also fewer as the speed goes
below
15WPM.
This comes to my mind just now, and it is a pity this method is not
used in amateur radio (much or barely) whilst it was common place in
professional "commercial" CW -- QSZ. QSZ means repeat each word
twice,
though QSZ3 would mean thrice, etc. This is a really effective way
of
getting messages through during QRN, QRM, QSB but also would be
effective for you in QSO. I and many others would surely be happy to
QSZ at 15WPM instead of sending at 10 WPM. This means that you get
each and every word sent twice, making it much easier to fill in
what
you missed, as you write it down.
If you sent QRS15 QSZ2 I'd understand what you meant, probably few
others would. You could thus find also good practice and fun in
"slow
traffic nets" of which there are some in USA, where you receive and
pass on messages (radiograms) and the OPS there would be very happy
to
both QRS and QSZ and moreover they will know what these codes mean
:-)
That upcoming EFHW sounds great :-)
GN from here and welcome to Email me directly to continue as I'm not
sure if this was your thread, and is now off topic?
On 21 Jun 2021, at 14:47, Julian N4JO <n4jo@barnlea.com> wrote:
Thanks for the encouragement, Louis!
Yes... I never thought that I'd get into CW - I certainly didn't
have that in mind when I finally committed to get my ticket in the
US back at the beginning of '19. Somehow I heard about Hans and his
QCX QRP design, and something clicked.. Now it has become a solid
commitment that I can't let go of. I _really_ want to be able to
toodle around the country on my motorbike and sling wires into trees
when I finally get to retire...
I believe you are absolutely right about the "Farnsworth Gap", Louis
(I had heard that advice from others too): I found I can easily
identify characters up at 25 and beyond, but can't read _NEW_ words
or callsigns at anything like that speed. For a while I was getting
about 75% or better of "100 most frequently used words" at 30/25,
but as soon as I slowed down my word speed for things like simulated
QSOs, or new words, it all fell to pieces. We really do learn
cadence, don't we? Again, you're absolutely right about it being
risky to rely too much on Farnsworth: there is no point in allow
that, because I can't be asking QSO partners to "please send at
20/10" - that's ridiculous. And the words really don't come when we
have more than a 5WPM gap, do they?
Right now the Wolphi Morse trainer that I use extensively on my
phone is set to 20/12, but I can't read at 12, so I have been
wondering whether to just stick it out or to reduce cWPM to 15 (I
really didn't want to go below 20), and use 10 for words (what is
the "e" in your 'eWPM? I know you mean "words", but what does the
"e" mean?)
On your recommendation I'll drop to 15 cWPM (no, I definitely won't
go below that: it took a lot to learn not to count, and I don't want
to go back there) and do whatever I can do for wWPM - 8 is probably
a good start, though maybe I can do 10 at 15cWPM - and see how that
goes. I have been advised to do at least occasional spells of
"higher-than-I-can-copy" speeds just to push the mind, but as you
say, I need to be relaxed for that.
Thanks again; I know how to move forward now, and I think I'll be
able to finally warm some leaves around my EF random wire with my
QSXs this summer ;-)
Actually, the family have ordered me a four-band EFHW for Father's
Day, so maybe I'll string that up when it arrives, and the random
wire will work for 30m and 80m...
OK, back to work now...
--
Julian, N4JO.
--
Love 30m and CW?
http://www.30cw.net [2]
Links:
------
[1] https://groups.io/g/QRPLabs/message/67555
[2] https://groups.io/mt/83212465/243852
[3] https://groups.io/g/QRPLabs/post
[4] https://groups.io/g/QRPLabs/mutehashtag/20m
[5] https://groups.io/g/QRPLabs/editsub/243852
[6]
https://groups.io/g/QRPLabs/leave/10312280/243852/1190336630/xyzzy
--
Love 30m and CW?
http://www.30cw.net
Links:
------
[1] http://lcwo.net/
[2] http://www.30cw.net/
[3] https://groups.io/g/QRPLabs/message/67579
[4] https://groups.io/mt/83212465/243852
[5] https://groups.io/g/QRPLabs/post
[6] https://groups.io/g/QRPLabs/mutehashtag/20m
[7] https://groups.io/g/QRPLabs/editsub/243852
[8] https://groups.io/g/QRPLabs/leave/10312280/243852/1190336630/xyzzy

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