I'm working through a build of the QCX, and noticed that the trimpot in my kit (R47) may be incorrect - it is marked '103' (10K value)? instead of '104' (100K value) as the instructions call for.? Are the instructions correct (is R47 in fact supposed to be a 100K trimpot), or is the component in the bag correct (is R47 supposed to be a 10K trimpot)?
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Several years ago I built several SMDR kits, I had bought a Commercial type LC meter but it wouldn't read the coils, then I found out about the AADE LC checker kit, easy to build and all of us that were building the kits, and a lot of kits later, found that the readings were almost right where they were suppose to be, we learned a lot about winding coils, one kit only required a few turns and at first we wound the coil with the leads close together, big mistake, watching the meter we spread out the coils until we got the proper readings, there was something different about the reference frequency the AADE kit used, it still works, as long as I remove the battery when I'm not using it and when I do use it, make sure I go through the calibration procedure as specified in the instructions.? I was sorry to learn that the owner became a silent key and the kits are no longer available, they were great for QRP kits, hopefully someone will come up with something close to what AADE made.
John K2IZ
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On Wed, Jan 17, 2018 at 3:48 PM, J68HZ <bill@...> wrote:
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The trouble with all of these LCR meters is rarely do they test at frequencies where you will be using the parts. ?The best solution ive found is to set up a test jig with my spectrum analyzer with a known capacitor or inductor in an LC circuit. ?Then scan/ measure at the frequency of use. ?Ive been a bit hard headed about trying to find the perfect LCR meter myself, but it doesn't exist.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it:
email:??bill@... ?
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On Jan 17, 2018, at 2:51 PM, Roger G4IUP < rogerlimbert14@...> wrote: Hi all, I use Peak Electronics LCR45.? It is not cheap but it is good. The DCA ?Semiconductor Analyser ?is also good.
73 Roger G4IUP.
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Re: My 40M QCX shipped yesterday!
Sorry, should have mentioned that it is S/N 2637!
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Re: Sorry Re: [QRPLabs] Magnet Wire " of colour "
I bought some enamelled "craft wire" in a craft/sewing shop a few years ago and one packet proved to be of ALUMINIUM wire.
I've since observed that flower arrangers and sewing shops are unaware of any other difference than the prices, Aluminium wire is slightly cheaper in larger quantities I was later told.
I can't give away a small packet of 0.35mm aluminium wire to an amateur, and the wife has stopped using those techniques, so maybe I should do flower arranging?
Peter ¨C LB0K
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of N1BUG Sent: 17 January 2018 15:11 To: [email protected]Subject: Re: Sorry Re: [QRPLabs] Magnet Wire " of colour " What is the difference between enameled wire sold as magnet wire and enameled wire sold as craft wire? I've always avoided buying the latter, wondering if it is suitable for our purposes. 73, Paul On 01/17/2018 08:01 AM, Mike W wrote: OOPS, wrong link.. sorry.
try
On 17 Jan 2018 at 11:57, Mike W wrote:
I have just received some wire from the "Scientific Wire Company"
28AWG (0.32mm) in many different colours - ideal for winding those
pesky Toroidal things.
Have a look at and their product code SPC-0320
They claim a total of 55 metres - enough to wind 'many QCX' and only
?3.58 plus taxes and postage
In my pack are two reels of light green and red, and one reel of dark
green, purple, brown, blue, orange, silver, old gold and light gold
no connection etc ad nauseam
hth, Mike
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Re: Taking another stab at getting my 80m QCX up and running
deleted the old post to correct bandpass to low pass
Correct (August). I completely hosed the range conversion up in my post.
Here's what I see at the BNC jack using the 50¦¸ termination on the probe. Scale 0-3mV. 1.44mV on the meter. Clearly the signal makes it to the low pass filter input. I guess I'm down to using the signal tracer now.
--
73
NE5U
Mike
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My 40M QCX shipped yesterday!
Happy, happy danced!? ?Can't wait to get started building!
73, Bill NZ0T
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Hi all, I use Peak Electronics LCR45.? It is not cheap but it is good. The DCA ?Semiconductor Analyser ?is also good.
73 Roger G4IUP.
On 17 Jan 2018 20:34, < rentwist@...> wrote: Here's what I use (but I do more surface mount than leaded these days):
Granted, not what many would consider cheap but "good ting no cheap, cheap ting no good!"
Had an AADE unit but was not happy with the strange readings I would sometimes get.? Returned it for a refund after building it and testing with it a while (this was all quite a few years ago).
73,
Robert, WA2T
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Here's what I use (but I do more surface mount than leaded these days):
Granted, not what many would consider cheap but "good ting no cheap, cheap ting no good!"
Had an AADE unit but was not happy with the strange readings I would sometimes get.? Returned it for a refund after building it and testing with it a while (this was all quite a few years ago).
73,
Robert, WA2T
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Re: QCX#2019 lost RF power out?
Hello Bernd,
Yes, I am checking those coils points to see if it might be that problem.? I may have to pull the coils and remount them.?
?? I was hoping it might be something else that I was missing, and could check.? Thanks for your help.
73, Kent KC9LIF
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hello kent, I would first alll tension according to manual page 123 ... check.
Then definitely all loot places on touch, and paint spots especially on the coils.
I had such a mistake s.einer coil after the device already worked a year without errors.
greeting bernd df4jy
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I put the WSPR on a dummy load and disconnected the receiver antenna which gave a useable signal.
Using the WSPR Waterfall I have ¡°birdy ¡° type signals across the band during WSPR transmission.
Bob, However you check you are likely to see multiple "signals". The important thing is the levels of these compared with the fundamental as shown by the WSPR decoder. This is providing you are certain there is no overload, signals can be strong even from a dummy load. It is not unusual to see multiple decodes from stations some distance away, these might be 30 or more dB below the fundamental. 73 Alan G4ZFQ Using CW mode with the QXL set to 14.097.100 I find the following on the receiver and waterfall:
signal at 14.096.4 in USB mode
signal at 14.097.1 in CW mode
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Re: key short the first dash
Hi Viktor! I think it is a problem with key contacts.? If you pass through the contacts of the 5-10 mA DC? at the moment of contact, it destroys the thin oxide film and makes the contact more reliable. The necessary changes in the diagram are shown in the Appendix.
73! Anatoly UT5ULX
Hi,
I observe the similar issue from time to time (when using external cw paddle).
Cheers,
Victor
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Re: QCX#2019 lost RF power out?
hello kent, I would first alll tension according to manual page 123 ... check. Then definitely all loot places on touch, and paint spots especially on the coils. I had such a mistake s.einer coil after the device already worked a year without errors.
greeting bernd df4jy
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Re: length of toroid wire
Dave
The on-line calculator at allow you to enter the number of turns for your core size
and will return the length of wire required.? There are other on-line calculators that do the same
thing.? is just the one that I routinely use.
Arv? K7HKL
_._
On Wed, Jan 17, 2018 at 11:07 AM, dave dabay <kd3pc@...> wrote: I am up to the winding L4 section of the manual and do not see a cut length for the wire for 20 meter operation?
I did scan the manual for this and did not see any reference.
Ideas, or ...
thanks
dave
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Thank you both. I cannot decode but I do not believe that is the whole problem.?
I have done Crystal/GPS alignment per the manual. I put the WSPR on a dummy load and disconnected the receiver antenna which gave a useable signal.?
Using the WSPR Waterfall I have ¡°birdy ¡° type signals across the band during WSPR transmission.?
Using CW mode with the QXL set to 14.097.100 I find the following on the receiver and waterfall:
signal at 14.096.4 in USB mode
signal at 14.097.1 in CW mode
On Wednesday, January 17, 2018, 11:33 AM, Bob Sutton via Groups.Io <zl1rs@...> wrote:
WSPR encoding in the early
QCX firmware versions has a bug (half the WSPR
transmission is incorrect).? It was
fixed in version T1.00e.? The QCX firmware history refers:
1.00e
| 07.Dec-2017 | - Bug fix: stored message sending now sends
at current keyer speed (not stored default)
- Bug fix: WSPR tones in the second half of the transmission
were potentially corrupted |
On 18/01/2018 5:53 AM, Roger Hill
wrote:
Hi Bob.
Do you have a receive setup for WSPR? If so, see if you can
decode your own signal. You will need to use a dummy load on
your receiver antenna, and perhaps turn on any RF attenuators
that your receiver supports, so that you don't overload it.
Roger
G3YTN
On 2018-01-17 16:49, Bob Cutter via Groups.Io wrote:
My
#308(no software upgrade)on 20 is operating well with several
contacts, including 5 SOTA.?
?
However I have failed on WSPR. Same antenna and varied
times so propagation should not be the culprit.?
?
External receiver and power meter show transmissions and
GPS has good data. I have performed the GPS calibration of the
transceiver.
?
I have varied the transmit frequency between 14.097.020 and
180.
?
Any suggestions?
?
72, Bob KI0G?
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Re: length of toroid wire
Try toroids.info on the web.
Roger
G3YTN
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On 2018-01-17 18:07, dave dabay wrote:
I am up to the winding L4 section of the manual and do not see a cut length for the wire for 20 meter operation?
I did scan the manual for this and did not see any reference.
Ideas, or ...
thanks
dave
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Re: Magnet Wire " of colour "
i had bought few wireslike these from ebay.
?But i find they are little tensile unlike pure copper. ?they are used for decorative lecing etc ?? But one smart guy advised making color enamel wires is DAM EASY. Just use marker pens and pass the wire thro its tip slowly. ?once the winding and terminating is over we dont care for the colors. All the best ?sarma ?vu3zmv
On Wed, Jan 17, 2018 at 10:56 PM, geoffrey pike via Groups.Io <gi0gdp@...> wrote: a better link:-
On Wednesday, 17 January 2018, 17:05, Mike W <mike@...> wrote:
Well, I've just rewound the trifilar toroid for one of my QRPLabs receivers
and I don't see any difference in RX performance between? the wire supplied in
the kit and the multi coloured trifilar wind of the 'craft' wire. So, AFIC the
multi coloured winding wins easily. no doubt that its wired correctly and if
the build fails to work you know to look elsewhere
On 17 Jan 2018 at 11:57, Mike W wrote:
> I have just received some wire from the "Scientific Wire Company"
> 28AWG (0.32mm) in many different colours - ideal for winding those pesky
> Toroidal things.
> Have a look at and? their? product code SPC-0320
> They claim a total of 55 metres - enough? to wind 'many QCX' and only ?3.58
> plus taxes and postage
>
> In my pack are two reels of light green and red, and one reel of dark
> green,
> purple, brown, blue, orange, silver, old gold and light gold
>
> no connection etc ad nauseam
>
> hth, Mike
>
>
>
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I am up to the winding L4 section of the manual and do not see a cut length for the wire for 20 meter operation?
I did scan the manual for this and did not see any reference.
Ideas, or ...
thanks
dave
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QCX#2019 lost RF power out?
Hi All,
For some reason, my 40M QCX has no RF power out.? It had the full expected out for the 12v that I was running after I went thru alignment (3.5W).? It also has very good Rx.? However, when I tried to use it a few weeks later, it did not put out any power.? It measures 0.01W on the internal RF Power meter (9.2) at L1 and 0.03 when measuring drains of the BS170s.? Any idea what might have caused this loss of output?? BTW, at 12.3V the Rx current is 117mA, while the Tx current is 187mA.
Thanks, Kent
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J68HZ
Retired Doc
Bernd