Date   
Re: QCX Troubleshooting

Hans Summers
 

 
Hans just cost me more money.  After seeing the excellent video.   I "had to have" a DS) 150 even though I have a very good lab scope and my QCX 40 worked perfectly after completion.  Might be useful on my next QRP-Labs build.

Yes I didn't need this 'scope either. I have a very nice 'scope here, Owon XDS3102A 100MHz. But, when I saw this cute little pocket 'scope I was somehow attracted to the concept and I wanted to try it, and at the time of purchasing I had in mind that I could make a video on debugging QCX receiver issues with it. Just to show that though tiny and cheap, and with limitations (the biggest limitation being the low 200kHz bandwidth), it can still be useful. 

FYI I chuckled when I read about Rex W1REX's (of http://www.qrpme.com/) buildathon at QRP ARCI FDIM next week, quoting Rex from https://www.qrparci.org/fdim 

"So this year, the FDIM Buildathon with be a little different. We will build a simple little O*Scope FUN! board for generating nice predictable signals to measure while we learn how to use a pocket oscilloscope....a little build time...and a little learning time! The price is a little higher for this FDIM as everyone will leave with BOTH the O*Scope FUN! learning board AND a very nice JYETech DSO Shell pocket oscilloscope. The scope sells for $39 at Circuit Specialists but I have made arrangements with them to get them at a reduced cost in order to keep the Buildathon price at $50."

As far as I can see, this Circuit Specialists 'scope https://www.circuitspecialists.com/dso150_shell_oscilloscope.html is exactly the same 'scope as the AliExpress one, probably made in the same factory. Just at $39.95, double the price. I'm not complaining. Everyone has to make money to feed themselves and their families. Me too! And W1REX's Buildathon and his "O*Scope FUN!" board look like a lot of fun and I'm really looking forward to dropping in on the buildathon if I can, to check it out... I was tempted to register for it myself but, Dayton is always so so hectic and I know I won't have a minute spare. 

Anyway - if you can't be at Dayton FDIM next week, and/or like me, you can't attend the buildathon... never fear! If you have a QCX then for under $20 watch the video and work through it, even if the QCX is working fine... and work through the troubleshooting page http://qrp-labs.com/qcx/qcxtrouble too - there's a TON of education and fun to be had. All for under $20... kind of, the poor-man's "W1REX FDIM Buildathon" hi hi ;-) 

With all due apologies to W1REX... I'm just shooting off some advance torpedos because W1REX always gives me a tough time at Dayton... so this time I get a kick in first. I always get a lot of heat from him because he says my QRP Labs kits are way too cheap! Hhahahahaha. Luckily I never listen hihihi... Love you, Rex! 

73 Hans G0UPL

Re: QCX Troubleshooting

Curt M.
 

Thanks Hans, this is perfect.  I built one of those scopes a few months ago and it passed their tests as I set it up but I've never used it yet.  I'm glad that you put the two together and now I have a reason to play around with it.

Curt M.

Re: QCX Troubleshooting

N3MNT
 

Hans just cost me more money.  After seeing the excellent video.   I "had to have" a DS) 150 even though I have a very good lab scope and my QCX 40 worked perfectly after completion.  Might be useful on my next QRP-Labs build.

Re: Fun With The QCX!

jjpurdum
 

Hi  Nigel:

The Nokia 5110 is a 48x84 pixel array, while the MCT uses a 240x320 array, so the menus would have to be rearranged a bit. For me, it's the libraries that make all the difference and I do know that there are some available for that display. The code is spread across 9 files, including a Menu.cpp and DisplayManagement.cpp files, which at least presents smaller chunks of code to contend with. It uses an encoder to scroll the menu options anyway, so assuming a 5x8 pixel/character font, I don't see why it couldn't be done.

Jack, W8TEE

On Thursday, May 9, 2019, 7:49:40 AM EDT, Nigel <zs6rn@...> wrote:


Hi Jack :-)

Question for you regarding screen used on your MCT: How easy will it be to change the type of screen used in the MCT project, even if the result is fewer lines of text shown at any one time or smaller font?

Reason for asking is that availability of screen being used in your project in this part of the world is limited / expensive / non-existent (importing via S.A. Postal service is a joke and courier service waaaay too expensive) but I do have something that 'may' work (monochrome screen from Nokia 5110 LCD) with assumption that appropriate library loaded.

Apologies if a newbie question, guessing once code made publicly available all will be clear!

Keep up the GREAT work and as always remember to KEEP SMILING!

73

Nigel ZS6RN ex G8DEV

Good UK sourced Molex 0.1 inch pin terminal crimping tools?

Chris Wilson
 

Chris Wilson 09 May 2019


I need a decent crimping tool for the 0.1 inch spaced Molex pin header
female terminals, can anyone recommend a suitable tool please?



--

2E0ILY
Best regards,
Chris mailto:chris@...



--
Best regards, Chris Wilson (2E0ILY)

Re: Fun With The QCX!

Nigel
 

Hi Jack :-)

Question for you regarding screen used on your MCT: How easy will it be to change the type of screen used in the MCT project, even if the result is fewer lines of text shown at any one time or smaller font?

Reason for asking is that availability of screen being used in your project in this part of the world is limited / expensive / non-existent (importing via S.A. Postal service is a joke and courier service waaaay too expensive) but I do have something that 'may' work (monochrome screen from Nokia 5110 LCD) with assumption that appropriate library loaded.

Apologies if a newbie question, guessing once code made publicly available all will be clear!

Keep up the GREAT work and as always remember to KEEP SMILING!

73

Nigel ZS6RN ex G8DEV

Re: QCX Troubleshooting

Ken KM4NFQ
 

Hello Hans G0UPL,

What I enjoyed the most about the Troubleshooting video was how you explained the use of the DSO150 pocket o'scope. Also, the explanations of how the QCX works were really well done. Thank you very much for producing such an informative troubleshooting video!

I shared the video link with a friend, and he was impressed with your explanation of the  DSO150, as well as the QCX.

Well done!

Best Regards,
Ken, KM4NFQ "Not Fully Qualified"


On Wed, May 8, 2019 at 3:15 AM Hans Summers <hans.summers@...> wrote:

Hi all

In a somewhat optimistic bid to marginally reduce my email burden, and for a bit of fun with the very low cost handheld Chinese 'scopes at under $20, I have produced a new video on QCX Troubleshooting, see http://qrp-labs.com/qcx/troublevideo.html

At 31:06 when I'm finished with troubleshooting, I sent some CQs on 7030 and was answered on the third try, by Nick LZ1NG. It was about 6:15pm local time and the band isn't very busy at that time, conditions weren't great; Nick at 677km is almost my next door neighbour and there was quite deep QSB. But the whole QSO is there and with subtitled transcription. At my end power 4W to OCFD antenna http://hanssummers.com/404ul and I'm using the microswitch as my Morse key. 

Here's a link directly to the QSO:

To weigh in on the "Learning Morse" discussion: I'd say learn the basics using trainers, tutors, writing down characters, whatever is good for you (everyone is different)... but the most important thing is get on air and start using it as soon as you can, even if you do not think that you are ready. You'll be surprised at how quickly you improve... you are having fun and inspiration, that builds enthusiasm... and your improvement will become smooth and painless! 

73 Hans G0UPL

Re: DX-ing with QRP - possible?

Anthony Luscre
 

Patience and Persistence and lots of Operating (all available bands and modes!)

CWSSBRTTYFT8FT4Grand Total
DXCC31430018718845326
DXCC
Band160M63
80M109
60M56
40M165
30M150
20M287
17M266
15M264
12M217
10M273
6M36

On Wed, May 8, 2019 at 6:58 AM Andy <andy9a3jh@...> wrote:
QRP DX-ing is very possible and happen (almost) every day.
You have to be patient and if condx on the HF are good then all depends
of your antenna... and rx on the other side :)
Here I made some recordings of my long path qso with vk3 on 40m:
https://www.youtube.com/watch?v=tjouV0Si_zo

Don’t forget, best amplifier is your antenna!

73 es GL,
Andy e21/9a3jh





--
Anthony Luscre

K8ZT
Ohio Section Section Youth Coordinator & Education Outreach
ARRL - The National Association For Amateur Radio™
 
a@... (best for Education & Technology)
k8zt@... (best for Amateur Radio)

The Web Resource Hoarder- www.ZTLearn.com
Web Resource Hoarder Blog

K8ZT Radio Website- www.k8zt.com
My Radio Blog- k8zt.blogspot.com


Re: DX-ing with QRP - possible?

Andy
 

Hi all,
My antenna configuration is switchable West/East/Omni, delay line is made by coax cable like in ON4UN Low bands DXing book or similar:
http://www.hamuniverse.com/n4jteverticalarray.html
This is low angle DX antenna and for local qso’s (<1500km) dipole at 10-12m will give you (little bit) better results on 40m. 2 element of vertical array are not noisy antennas if QRM not come from main lobe, F/B of this array is >16dB.
I used verticals also for portable, fishing rod 10m and 12 radials 8-10m. For 80m inverted L on same fishing rod is also interesting.

Anyway, CQ WW WPX CW contest  this month is good opportunity for all to make new DXCC QSO's with QCX, good luck!

73,
Andy e21/9a3jh

On 05/09/2019 12:44 AM, Joe Street wrote:
I agree about the radials being a hastle, but if you do have two 33' poles you could skip the ground system, set them 1/2 wave apart and make a half square.  This can be end fed just like an EFHW and gives gain in both directions broadside and is fairly portable, at least I consider it portable for say operating in a park, it's not a sota kind of portable.  If your poles are a little short you can put capacitance hats at the lower ends of the verticals.

On Wed, May 8, 2019 at 12:56 PM Arv Evans <arvid.evans@... <mailto:arvid.evans@...>> wrote:

Allison

What are your thoughts regarding loading coils on the ground plane
wires?
Should they be at the base, or out near the ends?  How would one
tune each
if there are many loaded ground plain wires?  Ground ATU...(GTU)...?

Arv
_._


On Wed, May 8, 2019 at 10:40 AM ajparent1/KB1GMX <kb1gmx@...
<mailto:kb1gmx@...>> wrote:

With a good ground plane a pair of phased vertical can be a
very good antenna for
RF quiet locations.  Not every one can put up two 33ft poles. 
The problem is 16 or
more radials under each is a task.  A lot of work and not
portable.

A vertical End fed halfwave if you have a  high enough support
is a great antenna.  If sloped
toward the desired direction it can be even better as then its
only one significant support
(say 40ft high for a 40M antenna) and offers a little gain in
the preferred direction.

Still for 40M a good 40ft or higher high dipole as flat top or
inverted V is a goto antenna.

The biggest issue is space and noise for 40M.  Next is keeping
the antenna efficient (avoid
loading coils)

Allison

Re: QCX Troubleshooting

Michael Sharp
 

Fred,
I think a lot of this OT discussion is considered “idle chatter” while we all patiently await the release of the QSX.

Granted, it does take up some bandwidth, but I (and I’m sure I’m not alone here...) have learned a few things along the way from others efforts. A lot of the subjects that have come to my Inbox have been interesting indeed, if not mildly entaining, and at least, informative.

Perhaps the solution to this “problem” is to preceed the subject line with the letters “OT” (e.g. OT - Learning CW), that way Hans can filter his input. Afterall, this is his creation... things like this will happen.

Re: Antenna #antenna

elliot.george.martin@...
 

Thanks for everybodies responses. I'm knew to all of this so I don't even know where to start but I have a QCX so I figure it is still a relevant discussion.

OCXO/Si5351A Synth kit

Mike Berg
 

Just built up the oven controlled synthesizer and was wondering what the final recommendations were for the oven controller mods to prevent runaway?

I'm running some PIC assembly code from AA0ZZ and the synth checks out hardware wise and I want to avoid any issues others may have had before I finish soldering the case shut.

73
Mike  N0QBH

Re: Learning CW

Stephen Farthing G0XAR JO92ON97
 

As an aside to this interesting conversation when I worked for a living one of my team, sadly not a Ham, had worked for the Royal Air Force and was fluent in several variations of morse. As I recall he could read English, Russian, Arabic and Farsee (Persian) at high speed, often several conversations at once. He was a short wave listener and I was hoping to convince him to take his licence exam. Sadly he died quite suddenly so he never got around to it. 

Without wishing to hijack the topic I wonder how many of us are fluent in other than English morse. 

Regards, 

Steve G0XAR 

Re: Antenna #antenna

Curt M.
 

After re-reading your original post I just realized that you were looking just to measure SWR and not tune the antenna.  My mistake.  But if you are looking for a tuner to tune up a long wire or something like that, the 4 States QRP Tuner is working great for me and it's supposed to be good up to 10 watts.

Re: Antenna #antenna

Curt M.
 

I built one of the Four State QRP tuners.  It works great.  I've made all of my QCX contacts through that tuner.  I also use it with my 10m beacon.  You can build it in an evening and I think it's one of the best designs out there for a QRP tuner.  I really like the red and green LEDs which helps you tune pretty fast once you learn which letter to set the dial for on the band that you want to tune.

http://www.4sqrp.com/4stuner.php 

Re: Soldering suggestions

geoff M0ORE
 

I'm using a Weller TC65, 45 Watt, 50 volts. Best iron I've ever had. Plenty of spare tips and a spare switch and element if I need them. Use it for everything from brass enclosures to SMD chips by just changing the tip.

On 08/05/2019 17:56, ajparent1/KB1GMX wrote:
My preferred is a Weller WES51also temperature controlled.  Not cheap but 
it works well for me.

My collection of irons go back to the Weller TCP60 that used curie point control 
that was pretty good for its day.  Its long since extinct.  I still use it as it can put
enough heat into a PL259 connector to solder the shell.

Biggest issue is as stated not enough or too much heat followed by not enough
thermal mass.  The ones that get too hot tend to burn up tips or worse everything
it touches.

The other detail  is quality solder,  63/37 kester-44 in .030 is a good start.

Allison

Re: SWR qsx reboots #antenna

hanz PA3ZZ
 

Joe and Paul,

MNI TNX !!!!
Perfect. I changed from a power supply to the battery and i works perfect. Found my self on rnb .

Many thanks guys.
VY 73 hanz

Re: SWR qsx reboots #antenna

paul wegwert
 

Hanz,

I think you mean QCX. Try a different power supply. It may be drawing more current than the p/s can handle. Also check you antenna connections. The QCX may be drawing more current when using the antenna vice the dummy load due to a higher SWR. I have had that happen to me with a wall wart and bad SWR meter.

Good luck,

73's

Paul
KD9JYV


Re: SWR qsx reboots #antenna

Joe Street
 

Common mode current?  How did you RF ground the QCX?  What kind of antenna/feedline?  Any common mode choke used?

On Wed, May 8, 2019 at 1:58 PM hanz PA3ZZ <hanz@...> wrote:
OM's
Just build the qsx 40meters.
RX is perfect
TX perfect on a dummload.
When i connect my antenna, swr 1:1.38, measured with rigexpert and a press the paddle or key the qcx restarts.
Connecting a dummy load,all fine, output 3 watts by 12 volt.

Anny ideas

tnx 73 hanz yl3jd

Re: Learning CW

K2DB Paul Mackanos
 

It has been so long since I learn CW, I can't remember how I did it other than a bunch of us in high school had a ham radio club and five of us would keep sending code back and forth between each other and increase our speed.
 
All five of us are still alive and kicking, and we all have code speeds north of 40 words a minute.
 
Sorry to let you know that I have no idea what method we used back then 

73 Paul K2DB