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Re: U3s misbehaving...
Alan G4ZFQ
The TX Frequent is 200 HZ wide 14.097000 - 14.097200 centre is 14.097100 MHz the confusion is:Andrew, Due to the fact that WSPR was first used with a SSB RXTX set to USB the Dial Frequency of that RXTX is quoted. WSPR then uses 1400-1600Hz modulation frequencies. The resulting RF is therefore 1400-1600Hz above the SSB "Dial Frequency". (Dial frequency = zeroHz modulation, USB modulation is above that frequency.) The actual filter characteristics used is not really relevant as long as it lets these signals through. SSB of course does not feature with stand-alone transmit gear like the U3. That's where the confusion starts. 73 Alan G4ZFQ * Band Dial freq (MHz) Tx freq (MHz)
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Re: #qcx+ More photos
Happy Father's Day Hans.
Take a little time off and spend it with the family. Time you'll never get back. Thank you for all you do! -- 73, Greg KY4GW
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Re: U3s misbehaving...
The TX Frequent is 200 HZ wide 14.097000 - 14.097200 centre is 14.097100 MHz the confusion is:
The RX dial frequency due to the 3 KHz band width filter, there need to be an offset to put the RX window in the centre of the filters response see below:
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Re: QRP Tuner Kit ?
dl5ybz@...
I use a the Elecraft T1 Kit ( https://elecraft.com/products/copy-of-t1-antenna-tuner-kit ) with a lot of fun.. yes.. it does not really match the prize tag of the QCX and may need extra balun or choke for some kind of antennas.. but on the other hand you may place this little box just at the feeding point of your antenna and trigger the auto tune by a remote wire... and yes.. the 9 V Battery will last very long..
There are Tuners that match even an open BNC connector on 80 m Band to 50 Ohm.. (also known as attenuators .. :) . ) But keep in mind.. there is no BEST TUNER.. it always depends on your antenna and what kind of matching is needed.. and take your feedline into account .. the best Tuner is no extra Tuner at all and very often a simple coil and capacitor will do the job for you in single band use very well.. (a toy to test the complex impedance of your antenna might be the best invest first... it will tell you the difference between expected values and real world...you can't transmit with it.. but you can calculate your matching network and best of all.. you get an idea, what kind of transformation will work best for this antenna and how lossy it might be) 73 de Olaf
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Re: QRP Tuner Kit ?
Emtech ZM-2 - I built one from a circuit diagram I found on the web and sometime later realised it was in fact the ZM-2.
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Re: #qcx+ More photos
Hans Summers
Thanks Ben, Gary! 73 Hans G0UPL
On Sun, Jun 21, 2020 at 6:00 AM Ben Bangerter, K0IKR via groups.io <bwbangerter=yahoo.com@groups.io> wrote: Hans, have a wonderful day with your wife and the little darlings, and forget about us whiners for a bit. Thank you for all you do for this community. Happy Fathers Day!
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Re: VFO Signal Generator with incorrect fundamental and sinusoidal contamination
#vfo
Byron Smith
Alan, You can calibrate the VFO by adjusting the Reference Frequency value, look in 2.7 of the VFO/Signal Generator operation manual. You should be able to remove all frequency error within the limitations of your measurement setup. Byron W9ELM
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Re: #qcx+ More photos
Ben Bangerter, K0IKR
Hans, have a wonderful day with your wife and the little darlings, and forget about us whiners for a bit. Thank you for all you do for this community. Happy Fathers Day!
73, Ben K0IKR
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Re: Gps problem.
collinschip2@...
Thanks. in fact, despite the solder in one hole, those holes are unused. We have wicked away the solder in that hole. Chip
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Re: #qcx+ More photos
Gary Bernard
Hans, how you do it I’ll never know. It’s beautiful. My order goes in tomorrow morning. Great dad’s day gift from me too me.
toggle quoted messageShow quoted text
Congrats, Gary W0CKI
On Jun 20, 2020, at 5:33 PM, Hans Summers <hans.summers@...> wrote:
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Re: #qcx+ More photos
Thank you for your extra efforts. Enjoy tomorrow with your family, we will still be here on Monday.
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#qcx+ More photos
Hans Summers
Hi all The rest of the QCX+ Assembly went without a hitch (following the disappointment regarding the incorrect LCD module). I have put some more photographs on this page: http://qrp-labs.com/qcxp/qcxpphotos.html which also show the installation of the QCX+ Dev kit. I greatly enjoyed putting this together, finish it this evening. All works perfectly. Ladies and gentlemen, although you might accuse me of being slightly biased, and well in fact I suppose I definitely am a bit biased, I have to tell you anyway: this is one helluva a fine and beautiful radio. I'm sure you're gonna LOVE IT! Meanwhile it seems time has rolled on again and it is 2:30am here now, and I'm suspecting the 2.something monstroids and their Mummy are perhaps going to take me out somewhere for Father's day breakfast in the morning. So GN and happy QCX+ dreams. . . 73 Hans G0UPL http://qrp-labs.com
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Re: QCX+ arrived!
Paul AI4EE
My wife says I can wait.
So I will. Paul AI4EE
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Re: VFO Signal Generator with incorrect fundamental and sinusoidal contamination
#vfo
alan bohne
Geoff queried whether I knew the accuracy parameters for the USB Osc, and thus ultimately determine whether the VFO/Sig Gen Clk0 frequency is in fact offset from the VFO frequency displayed by the kit. The USB Osc reputedly has max and “equivalent” sample rates of 20 Mhz/sec and 2.4 Ghz/sec, and a time accuracy of 25 ppm. Additionally, the Mouser website indicates that 27 Mhz crystals have both a tolerance and frequency stability within about 10-100 ppm (assumedly dependent upon specific part selected), all of which suggests there may be no way I can truly explain the source(s) of my “apparent” observed differences Having no truly verifiable method to answer this question, I conducted a purely nonscientific test to see whether any qualitative (and mildly quantitative) answer could be deduced. Using a PC tone generator, I determined I could reliably, audibly determine 20-30hz tonal differences around the FT817 sidetone frequency of 700hz. I then checked the FT817 10Mhz tuning against WWV and found it seemingly dead on (or at least within a +/- 20hz offset). I then sent the VFO clk0 sinewave signal into the FT817 at 3 frequencies (10.1/21.0/28.0 Mhz) and adjusted the FT817 tone until it matched the 700 hz tone from the PC. At each VFO setting, it was consistently determined that the actual VFO Clk0 frequency was about 44 hz higher (range was 43-45 hz) than the frequency displayed by the kit. I then retested the VFO/Sig Gen with the USB Osc and today found the USB measured offset was about 82 Hz higher than that displayed by the kit (about 3 hz higher than yesterday… temp difference…VFO or USB Osc instability ???). Anyway…, this purely nonscientific, small sample size, test “suggests” that both the VFO output sinewave is higher than that displayed by the kit (about 44 hz), and the USB Osc is measuring about 38 hz higher than actual. Unquestionably, someone will point out the various uncertainties in all aspects of this minimal test, and combinatorially/statistically show my deduction is in error…or simply refer me back to the tolerance and stability numbers I mentioned above..and perhaps correctly suggest I will never know what is going on unless I use some very sophisticated lab equipment…but…at the moment it is all I can come up with given my setup…and it was fun…and I learned a tiny bit more re equipment than 2 days ago…and yes…I have a long way to go… Tnx, Alan, K1ARW
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Re: A few good Beta Readers needed...
I thought I could see the light at the end of the tunnel, then I realised it
toggle quoted messageShow quoted text
was someone else, with a torch, coming the other way..
On 20 Jun 2020 at 13:53, Bill Cromwell wrote:
Hi,
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Thank you you both for the clarifications. I know what to put in my shopping cart now ;-)
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Re: QRP Tuner Kit ?
This looks just like the QRP-Guys multi-tune, which also handles
balanced line and high and lo-Z wire outputs. https://qrpguys.com/multi-tuner Julian N4JO.
On 6/20/2020 3:36 PM, August Treubig
wrote:
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Re: QRP Tuner Kit ?
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Re: QRP Tuner Kit ?
robert tharp <rtharp0001@...>
Emtech ZM-2.
On Sat, Jun 20, 2020 at 3:52 PM w2eck <eckerpw@...> wrote: Thanks guys for the replies - I liked the looks of the 4SQRP Tuner Kit and just ordered one.
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Re: QRP Tuner Kit ?
w2eck
Thanks guys for the replies - I liked the looks of the 4SQRP Tuner Kit and just ordered one.
73 Paul w2eck
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