Re: How much heat is "a lot"
OK, change in question: I managed to get the components soldered...but sure enough, the audio jacks are neither of them quite flat to the board. :-(
What's my best strategy for rework? Desolder them completely (if I can) and secure them properly with a rubber band or something next time?
/m
On Mon, Sep 23, 2024, at 20:38, Michael - WD0OM wrote:
I've got to the point where I'm trying to install the rear-panel connectors on my QMX+, and here is where my novice status as a solderer shows the most:
Just how much heat and time is "a lot". Because the DC jack (which is perhaps foolishly where I started, but it is listed first) is laughing at me! :-)
Michael WD0OM
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I've got to the point where I'm trying to install the rear-panel connectors on my QMX+, and here is where my novice status as a solderer shows the most:
Just how much heat and time is "a lot". Because the DC jack (which is perhaps foolishly where I started, but it is listed first) is laughing at me! :-)
Michael WD0OM
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QDX HB 20m RF filter sweep is very high
Just built my Rev 4 QDX HB (12V) after it has sat in the box for a couple years or more. Am doing initial testing. My RF filter sweeps look pretty good for all bands except 20m... there is actually a dip in the sweep at 20m, and it peaks at about 17.5 MHz. I see some old posts about this being relatively common but I didn't find any follow up.
Is this normal? Is there a fix that I am missing?
73, Steve AK0M
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Re: Still no output on QMX
Good to know! Thanks!
73, Paul -- AI7JR
On 9/23/24 11:39, Donald S Brant Jr via
groups.io wrote:
On Mon, Sep 23, 2024 at 02:18 PM, Paul - AI7JR wrote:
In general, how do changes in input voltage affect
the efficiency of a typical buck/boost supply?
I am not a power supply expert, but from what I have seen, the
efficiency seems to be more related to load current, with a
broad peak and a shallow falloff, and fairly insensitive to
input/output ratio, but typically above 90%.
73, Don N2VGU
--
Paul -- AI7JR
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Re: 180pf (181) Capacitor Needed
Dear Tisha AA4HA
There is a bubble wrapped envelope on the way to you first class mail with two 180 pf capacitors.?
I had two different styles so I sent you one of each.?? I think this will solve you capacitor problem.
The envelope should be delivered by Friday 9/27/2024.??
?
Hope they will work for you.??
Take care and have fun,
73 Dave WA5DJJ
SUPER GRABBER - ,qsl.net/wa5djj/
?
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Re: QMX+ Kit - Capacitor Marking
K indicates +/-10% tolerance. J indicates +/-5% ?tolerance .
Nudging the turns on L404 one way or another should accommodate any variations in the cap value.
However since you have already measured the capacitance of the part as “pretty much 33 picofarads” it should probably be a non-issue.
Ray WB6TPU
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Show quoted text
On Sep 23, 2024, at 1:48?PM, Greg McCain via groups.io <gamccain50@...> wrote:
? My new QMX+ kit arrived in Virginia today, only 7 days after the 'shipped' notice from QRP Labs. Amazing considering that includes a weekend.?
?
Checked the contents and everything is there BUT ..
?
The Capacitor for C402 is labeled '33K' instead of '330' or '33J'. It measures out pretty much at 33 picofarads, but the'K' apparently? may indicate a 10% tolerance vs others in the BOM that have the 'J' designator.
?
Is it good to use?
?
Thanks in advance.
?
73 GREG KI4NVX?
?
?
?
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Re: QRP Labs Turkey Workshop?
Hans,?
Alas I’m off to Budapest and Rome for October. But I’d be happy to arrange something later or earlier next year. I wonder if I could tempt Jan and Alan as well.?
73s Steve?
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QMX+ Kit - Capacitor Marking
My new QMX+ kit arrived in Virginia today, only 7 days after the 'shipped' notice from QRP Labs. Amazing considering that includes a weekend.?
?
Checked the contents and everything is there BUT ..
?
The Capacitor for C402 is labeled '33K' instead of '330' or '33J'. It measures out pretty much at 33 picofarads, but the'K' apparently? may indicate a 10% tolerance vs others in the BOM that have the 'J' designator.
?
Is it good to use?
?
Thanks in advance.
?
73 GREG KI4NVX?
?
?
?
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Re: QRP Labs Turkey Workshop?
I would definitely be interested, however I have as yet renewed my passport, I could plan for next year with the XYL. I would love to explore those ruins.
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Here's the proper link to the USB cable that I use between my QMX and PC.
?
?
As I recall from other discussions on this topic within this group, the shield of the USB cable is not, by spec, supposed to connect to the ground side of both connected devices, which is surprising to the uninitiated. But many cable manufacturers do make that connection.
?
?
--
73
de Roy - KI0ER
Littleton, Colorado USA
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Re: QRP Labs Turkey Workshop?
Hans,
why must you tempt us, so?! :-D
Sadly, I
think I'd need a lot more lead time to plan a trip like that from
Minnesota! But that doesn't mean I didn't at least peek at
flights...
/m
On
Mon, Sep 23, 2024, at 13:54, Hans Summers wrote:
Hi
all
We would like to see if there is
interest in arranging a workshop here in Dalyan, Turkey. Location is
25km from Dalaman international airport (about 25 minutes' drive) with
direct low-cost flights from many European destinations including
Austria, UK, Slovakia, Ireland, Germany, Belgium, Netherlands,
Switzerland, Poland and of course,
Turkey.?
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Re: QRP Labs Turkey Workshop?
Oh man! I wish I could. I’ve traveled a lot of Turkey but not your region. Always beautiful country and great food.?
Ken/NO4D Wishing and Daydreaming ?
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Show quoted text
On Sep 23, 2024, at 2:55?PM, Hans Summers via groups.io <hans.summers@...> wrote:
? Hi all
We would like to see if there is interest in arranging a workshop here in Dalyan, Turkey. Location is 25km from Dalaman international airport (about 25 minutes' drive) with direct low-cost flights from many European destinations including Austria, UK, Slovakia, Ireland, Germany, Belgium, Netherlands, Switzerland, Poland and of course, Turkey.?
The area is a few km inland from the sea with access via river estuary to the beautiful Iztuzu beach, which is also a protected nature reserve for nesting sea turtles. The ancient ruins of the city of Kaunos () is within a few km walking distance.?
The weather at this time of year is very nice, averaging?+26C midday in October without about 75% chance of pure?blue sky sunny days. The weather is still warm enough for comfortable swimming in the sea and?pool, and many tours and trips are still available as it is not yet the end of the summer season.?
For the XYLs there?are many activities?possible including natural thermal springs mudbaths, boat trip tours and local markets. For the radio amateur you are welcome to buy and assemble some of your favourite kits here in QRP Labs HQ complete with testing and alignment?while here, all equipment will be provided (test equipment, soldering irons). There are lots of hiking areas and mountains in the area so if portable operations are your thing, there's plenty of opportunity for that too (regrettably Turkey is not yet a member of SOTA but POTA does operate here).? - Shared villa accommodation ?50/night - self-catering with 5 ensuite rooms, pool and barbecue, 5 minutes walk from town center restaurants, bars and shops - and 2 minutes' walk from QRP Labs ;-)
- Airport transfer?and return ?35 each way
- Boat trip to Iztuzu beach including lunch ?35
- Many other possible activities (trekking, climbing, safari)
As it is approaching the end of the holiday season we have villa availability in October so dates can be flexible. Please let me know if you are interested and we can set it up.? <dalyan-kings-rock-tombs.jpg> <villa5.jpeg> <villa4.jpeg> <villa1.jpeg> <villa2.jpeg> <villa3.jpeg> <area.png>
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QRP Labs Turkey Workshop?
Hi all
We would like to see if there is interest in arranging a workshop here in Dalyan, Turkey. Location is 25km from Dalaman international airport (about 25 minutes' drive) with direct low-cost flights from many European destinations including Austria, UK, Slovakia, Ireland, Germany, Belgium, Netherlands, Switzerland, Poland and of course, Turkey.?
The area is a few km inland from the sea with access via river estuary to the beautiful Iztuzu beach, which is also a protected nature reserve for nesting sea turtles. The ancient ruins of the city of Kaunos () is within a few km walking distance.?
The weather at this time of year is very nice, averaging?+26C midday in October without about 75% chance of pure?blue sky sunny days. The weather is still warm enough for comfortable swimming in the sea and?pool, and many tours and trips are still available as it is not yet the end of the summer season.?
For the XYLs there?are many activities?possible including natural thermal springs mudbaths, boat trip tours and local markets. For the radio amateur you are welcome to buy and assemble some of your favourite kits here in QRP Labs HQ complete with testing and alignment?while here, all equipment will be provided (test equipment, soldering irons). There are lots of hiking areas and mountains in the area so if portable operations are your thing, there's plenty of opportunity for that too (regrettably Turkey is not yet a member of SOTA but POTA does operate here).? - Shared villa accommodation ?50/night - self-catering with 5 ensuite rooms, pool and barbecue, 5 minutes walk from town center restaurants, bars and shops - and 2 minutes' walk from QRP Labs ;-)
- Airport transfer?and return ?35 each way
- Boat trip to Iztuzu beach including lunch ?35
- Many other possible activities (trekking, climbing, safari)
As it is approaching the end of the holiday season we have villa availability in October so dates can be flexible. Please let me know if you are interested and we can set it up.?
|
Re: Still no output on QMX
On Mon, Sep 23, 2024 at 02:18 PM, Paul - AI7JR wrote:
In general, how do changes in input voltage affect the efficiency of a typical buck/boost supply?
I am not a power supply expert, but from what I have seen, the efficiency seems to be more related to load current, with a broad peak and a shallow falloff, and fairly insensitive to input/output ratio, but typically above 90%.
73, Don N2VGU
|
Re: Removing flux. Is it necessary? Yes/No
On Mon, Sep 23, 2024 at 01:12 PM, Steve H wrote:
2. The sooner you clean the board after soldering, the easier it is to remove the flux.
3. Flux which has not been overheated and burned will come off much easier, too.
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Re: Still no output on QMX
If he built for 9V and ran from a "13.8" V supply, would that
affect conversion efficiency? In general, how do changes in input
voltage affect the efficiency of a typical buck/boost supply?
(Thanks for the info, too!)
73, Paul -- AI7JR
On 9/23/24 05:07, Donald S Brant Jr via
groups.io wrote:
On Mon, Sep 23, 2024 at 12:05 AM, Paul - AI7JR wrote:
Don't know what the comparative losses will be in a
switching regulator... Close maybe, but I don't know which
would be better!
A switcher at 95% efficiency would waste 12W x 0.05=0.6W vs 1.8W
with diodes.? So 1/3 the loss.
73, Don N2VGU
--
Paul -- AI7JR
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Another option is to try your library. Most these days have one if not several 3d printers. Usually incredibly cheap too. It's been a while since I checked but last I saw, ours was a few cents a gram of plastic used. Some may charge by time.?
?
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Re: Removing flux. Is it necessary? Yes/No
Thanks for the toothpick suggestion to clear the lint, I used a Q-Tip with Isopropyl alcohol yesterday working on my QMX build and found a lot of that.
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Paul - do a search on Facebook Marketplace. I found someone locally to print my (tr)u-sdx boxes.
gl de va3rr
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Paul - AI7JR
Joe AI5DD
Donald S Brant Jr
Barb WB2CBA
va3rr