..I may have been able to answer my own question.? Found a toroid winding calculator online.? Seems that 68 turns on a T50-2 is about 23uH.? Opinions?
de K2TL.. since 1964
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Can someone tell me the inductance of S3 for the 80 meter T1?? I lose track trying to count 68 turns and it would be a whole lot easier just to measure S3 for the proper L.? Everytime I count the turns, no matter what trick I use, i get a different number.? So OK, I'm a loser.? Maybe the value is in the manual someplace but I'm already going blind trying to wind 68 turns of #32 wire on a T50-2.. 83 turns? and loops with the wire provided in the kit is madness.? 68 turns is not much better.? Just please, somebody, tell me what the inductance is and I'll be fine.? Thanks!? ( oh, and if that info is not available, maybe some superhuman can wind 68 turns on a T50-2, measure it, and let me know.? I'll buy you coffee.
de K2TL.. since 1964
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Halden NR7V
Running the filter design in a circuit simulator like LTSpice and using Monte-carlo
analysis should show the effect on performance at various levels of tolerance.?
I have the same meter and find it to not be as accurate as a good lab-grade instrument,
but it is quick and accurate for checking components before soldering them into a board.
Arv? K7HKL
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On Sat, Aug 11, 2018 at 3:41 PM HF via Groups.Io <incorridge= [email protected]> wrote: Hi all... I've been reading on this forum that there have been some issues with the bluish capacitors for the QCX low pass filters.? I recall that the matter is on Hans' list to investigate, but haven't seen an announcement from him about his conclusions yet.? I ordered an LCR meter (marked LCR-T5, has a red PCB with lever socket and buttons marked OFF and TEST) on ebay to check mine.? I'm now building my QCX (20m version).? The nominally 390 pF capacitors C25 and C26 measure at 368 and 370 pF.? The nominally 180 pF capacitors C27 and C28 measure at 164 and 172 pF.? The meter doesn't show them as being particularly lossy.? I don't know the claimed tolerance for these capacitors, so I don't know if being off by 5-9% is significant, nor do I know whether this inexpensive LCR meter is capable of measuring to 5% accuracy. Is this enough information to decide whether to order alternates?
Halden NR7V
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Hi all... I've been reading on this forum that there have been some issues with the bluish capacitors for the QCX low pass filters.? I recall that the matter is on Hans' list to investigate, but haven't seen an announcement from him about his conclusions yet.? I ordered an LCR meter (marked LCR-T5, has a red PCB with lever socket and buttons marked OFF and TEST) on ebay to check mine.? I'm now building my QCX (20m version).? The nominally 390 pF capacitors C25 and C26 measure at 368 and 370 pF.? The nominally 180 pF capacitors C27 and C28 measure at 164 and 172 pF.? The meter doesn't show them as being particularly lossy.? I don't know the claimed tolerance for these capacitors, so I don't know if being off by 5-9% is significant, nor do I know whether this inexpensive LCR meter is capable of measuring to 5% accuracy. Is this enough information to decide whether to order alternates?
Halden NR7V
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The VFO/SigGen kit includes, but does not install, R6.? In AppNote6 for the SigGen Set, the additional jumper is shown running from R6 to pad W0.
Just to verify: when used as part of the SigGen set, R6 should in fact be installed on the QCU board.
Thanks for any/all info!
Bruce K1FFX
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Now, questions about Relay Kit; Re: Problems with Relay Kit;
I just read the topic that his message originally was meant for.? I have a learning question.? What do the jumpers at W0-W1 and W2-W3 physically do on the board?
I am currently using the U3S successfully with LPF at position 0.? I have the relay board all set and ready to go with (5) LPF.? I am missing the relay to put in position 0.
I was considering continuing the final wiring of antenna while I waited on the final relay.??
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Re: Blew up QCX with GPS - repair advice?
Yep, could be that indeed Alan.? Also I should note that I was using an unmodified Rev2 board, so the PA instability issue might have had some hand in this as well.
73,
? Bob
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Martin is right: You first must confirm (enter) the seleted RIT with the left button, then you can leave the function with the right button and the RX offset will stay. The term "RIT" is a bit misleading in the case of the QCX, it is not a RIT like we are all used to from our ICOMs, YAESUs and Kenwoods. I have metioned that to Hans al?ready a few months ago and if I remeber correctly he wanted to think about a change in funtion, but I assume that Hans has so much work that he can't keep up with all our suggestions and wishes as desirable they may be.
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Re: QCX from 9.6V supply - worth trying? (plus low voltage sidetone issue)
If you just want a low cost power supply, you can get 3 18650 e-cig batteries and get a 12v supply out of that.? 3s battery packs are a couple bucks, and it should be easy to find chargers and cells on a college campus.
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Re: Assembly manual for VFO/SigGen kit QCU Rev 4
#vfo
Hi Bruce
The changes to the PCB for Rev 4 were inconsequential, there is no separate Rev 4 manual... use the Rev 3 one...?
My suggestion build the VFO board first and the Synth board, and get it working... then worry about adding the relay board and 6 LPFs according to the App Note AN006 at
73 Hans G0UPL
I'm about to start construction of the VFO/SigGen HF Sinewave Set, of which one component is the VFO/SigGen kit.? The PCB is marked QCU Rev 4.? The URL to download its assembly manual includes QCU Rev 4 in its title.? However, when I open the PDF, its big red letters up top say? Rev 1 or Rev 3.? I'm assuming it's just an editing oversight, but I wanted to make sure there isn't a Rev 4 assembly manual out there, before I heat up the soldering iron.
Also wondering if there is an implied or recommended order for assembling the various modules that comprise the set.
Thanks for any info.
Bruce K1FFX
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Hi all
Just a note to say, if you emailed me but I haven't replied, it is because I'm a bit behind on the emails. It is hard enough to keep up with the email traffic normally. But this week even harder, as I am currently in South Africa attending the YOTA 2018 summercamp (a.k.a. wintercamp, technically). YOTA = Youngsters On The Air.?
Clearly, on the organizer side, not the participant side, as I don't meet the Y criteria in YOTA by a factor of nearly 3dB. I have been so busy I haven't been OTA since December either... so fail on all counts ;-)
So please bear with me until I can catch on on the emails when I get home towards the end of next week.?
73 Hans G0UPL
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I think its acting normal. I have my U3S connected via an ammeter, and honestly the backlight current isn't much if you are on a power supply. I suggest setting it to he visible. Carefully adjust the pa bias, and you should be ready for transmit. It may take many cal cycles before rig falls into wspr window, so patiently wait for spots.
Curt
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Re: Where are the emails?
Receiving now. Went back over all? settings , found an odd box on groups.io homepage and it said something like messages bouncing [don't remember exact terms used-it's gone now]. Anyway, I checked the box and all seems normal now. Thanks for all feedback.
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Re: Where are the emails?
Did they get routed to your Spam folder?
Jack, W8TEE
On Friday, August 10, 2018, 8:53:17 PM EDT, Allen Poland <atpoland@...> wrote:
None here.? I¡¯m swamped daily. ?
From: [email protected] [mailto:[email protected]] On Behalf Of Jim Kilgore
Sent: Friday, August 10, 2018 3:49 PM
To: [email protected]
Subject: [QRPLabs] Where are the emails? ? It has been a week since I've received any emails from the QRPLabs group. Don't see any changes in spam filter or anything. Is anyone else experiencing this problem?
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Re: Where are the emails?
Yes same here i have sent a couple through earlier in the week with no reply.
Stuart Vk5ade
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Re: Where are the emails?
Hi Jim,
I'm receiving a dozen or more each day for the past week, and some days get more.
Larry AC8YE
On Fri, Aug 10, 2018 at 3:57 PM, Jim Kilgore <jakil@...> wrote: So it's local. Will now begin troubleshooting the signal path. Thanks
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Hey gang,
I'm working on setting up (and getting to know) a new U3S which I just finished assembling yesterday. ?It has a QLG1 GPS and the firmware is v3.12.
During the build I configured the U3S pcb for "software variable brightness." ?In the firmware I set the "Bright" timeout setting to turn off the backlight after 5 minutes of no activity. ?This seems to works fine.
HOWEVER, when the backlight turns off I can't rewake the display! ?Pushing and / or holding either the left or right buttons doesn't do anything. ?I have to turn the power off and back on to get the display light back on on. ?Since I haven't done any transmitting yet I can't tell if the firmware is locking up or if it's just the backlight.
Is anyone else using the software backlight timeout feature and does it work properly for you?
For now I've just turned the backlight timeout off.
73,
John
AA7US
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Hi all, For those interested in delivery times:
26th July ordered QCX20.
27th July despatched from QRP Labs.
31st July despatched from Turkey.
? 9th Aug received UK International Processing Centre Heathrow London.
10th Aug received.
73's Dave M3PMG
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Re: Where are the emails?
So it's local. Will now begin troubleshooting the signal path. Thanks
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Klaus Beckers
jjpurdum
Larry - AC8YE
AA7US