Re: My 40M QCX shipped yesterday!
Same here! Excitement mounting.(S.N. 2383)
I've already built one, and it worked beautifully until I messed it up.
Soon I'll be able to use my new one to compare voltage readings, waveforms etc. and get the original one back up and running - I hope!
73, Julian G4ETS
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Re: QCX 80 Transceiver - Connection for a Straight Key
Hans,
Is this still on the agenda? ?Auto detect would be nice but a menu option will do.
Regards
Simon VK3ELH?
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Power lag issue on QCX
#qcx
On key down at low supply voltages there is a lag before reaching the final power. Example: For a 11.5V supply it starts at 1W, and there is a delay of several seconds before a fairly rapid increase, reaching the final value of 2.3W. Glenn VK3YY had a similar problem - solved by replacing LPF capacitors:? /g/QRPLabs/message/16511?p=,,,20,0,0,0::Created,,qcx+rising,20,2,0,6073488,?and indeed I have found that there is no lag at the input to the LPF at the C29-LPF junction. More investigations to follow .. 73, Euan
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Hi all
This is a monthly reminder of?guidelines?for?posting?to the QRP Labs group. Keep these?guidelines?in mind when?posting?to the group.? - Remember your email goes to up to 2500 people - so ask yourself, is it something you really want 2500 people to see?
- Before asking a question, please ensure you have read the relevant manuals and web pages thoroughly, to see if your question is already answered somewhere.
- Also check the FAQs??and??
- Don't write about your kit arriving. Send that to?sales@...?instead - where it is compiled into statistics published here?
- For any questions about shipping or your order, please email?sales@...?instead
- In the event of any missing or damaged component, please email?sales@...?instead
- Please don't write "Happy Christmas", "Happy New Year" etc messages - it's very nice of you but imagine if all 2500 members wrote it...
- It is nice and friendly, to provide your name and callsign - or if you wish, you can add a photograph and whatever details you like, to your profile:?/account?page=profile&profilesubid=0
- Use tags to label the subject; a list of tags is available when posting to from the web interface, or just type in the subject line e.g. #qcx if your post concerns the QCX transceiver kit
- If you are asking for help with a problem, please provide as much information as possible about your problem; "Doctor I feel sick" never helps the doctor to diagnose much, without a lot of further questions; it saves time and messages, if you provide as much information as you can at the outset.?
- If you change the topic of a thread, please edit the subject line or start a new thread, to keep the content and subject lines relevant.
- Remember, a lot of people in the group are hobbyists trying to help other hobbyists for free and in their own spare time.
- If you find the volume of emails too high, remember that you could also configure your group membership to send you "daily digest" emails, collecting all posts for a day into one; or you can configure it to group 12 posts in one email.?
- Be NICE... remember, it is easy to misunderstand each other over email: when we cannot see each others faces, we miss a lot of emotional indications
Thanks & 73 Hans G0UPL
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This checker is ready build , not a kit , for 45 Euro? (-:
73 John
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Here is a FB copy of the AADE :
73 John
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Hi Sean
10K is correct. See?
73 Hans G0UPL
On Thu, Jan 18, 2018 at 12:15 AM, Sean W7SKD <sean.jrdalys@...> wrote: 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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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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John PD7MAA
J68HZ
Retired Doc