On Sun, Oct 6, 2024 at 11:32 AM, Greg McCain wrote:
*
REMOVING THE ENAMEL AND TINNING THE LEADS
A soldering iron can also be used to remove the enamel.? The method works best with a temperature controlled iron or workstation.? If you can adjust the temperature on your iron, you will want to set it between 750 and 800 degrees F.? If your iron has removable tips, put on a larger tip then you would normally use for pc board soldering.? The larger tip will hold more solder and will maintain a more constant temperature during the enamel removal process.? To start removing the enamel, melt a large blob of solder on to the tip.? The solder should melt almost instantly and should remain molten on the soldering iron tip.? Next, run the wire slowly through the solder on the tip until you reach the mark you had put on the wire.? ?You will see the enamel being removed and the wire being tinned at the same time.? The solder will retain the ash from the enamel.? This will require you to clean the contaminated solder off of the soldering iron tip and melt fresh solder on to the tip frequently.
*
I have built many 'toroid dense' kits over the years. I have used Michael's method and never had a problem with a solder joint for a toroid.
I use an old Weller W100 soldering iron normally used by stained glass workers. I clamp it horizontally to the edge of my work bench with either 'wide' side of the tip facing up. I also use a doubled over layer of heavy duty aluminum foil underneath the tip area.?
That iron is still available. There are look alike clones out there but I've seen some really bad reviews for those. Its not cheap, but not really awfully expensive especially if you think you'll be using it a lot. Mine is about 20 years old and the original tip is still working fine.?
Feed solder onto the tip with one hand to build up a nice blob of hot solder on the tip then feed in the wire ends with the other hand slowly until the enamel is burned off back to the mark made earlier (and a bit more - see the NOTE above). Its useful to be ready to feed in some extra solder sometimes.?
I do find that thicker wire might need a scrape or two with an X-Acto knife edge to give the solder some bare wire to 'bite' on to start the burn off reaction with this method.? I keep a small, wet kitchen sponge nearby and wipe the soldering iron tip clean frequently.?
Quite a process!
Hans recommends thermal stripping as well, BUT frequently if not daily on this forum there is a tale of woe by one kit builder or another, which after more or less struggle, turns out to be caused by inadequate enamel removal.?
Maybe more experience would give better results, but the fact is that there are a lot of problems with getting it right.
?
I use and recommend to use this Knipex tool and avoid the hassle: ?
They sell additional sizes of blades but I have had great success with the default one.??
?
I sure miss the old, hazardous Strip-X chemical enamel (and flesh!) stripper.? ?Nasty phenol-smelling stuff but the enamel came off clean and the wire was shiny and un-nicked, ready for tinning.? ?
73, Don N2VGU
|
Re: Ultralight vertical offer
I am interested.
?
What’s the postage to 75093 Texas in US from Okinawa?
?
John - W3JED
?
|
Thanks Don for your feedback. I am not an experienced tech and I will keep in mind your comment.
Regards. 73 de Jeff | VA2SS
|
The PanVise can be used for lots of projects.
I use the Hakko cutter and buy them through Amazon. They’re good. Dont use them for cutting larger diameter wires. They won’t last for 20 years but for six bucks they are almost disposable.
|
Re: 50w PA 80m version overheats transformers?
There is little power going through T1.? Any heating its from the heatsink.
Or something is radically wrong.
?
I've not seen any great heating of the transformers.
?
I'd suspect the bias is set above the suggested value.
?
?
--
Allison
------------------
Post online only,?
direct email will go to a bit bucket.
|
#QMX PTT for SSB with built-in mic?
#qmx
I'm excited with Han's update for SSB, imagining me using my handheld QMX like an HF walkie-talkie.
?
From the operating manual, I see the paddle port wiring for the external microphone and the PTT switch, but no explanation about the built-in mic.
?
So how will we use the built-in mic for SSB? Would we still need a PTT switch connected to the paddle port, if not VOX used? Or, can one of the four push buttons be used for PTT in the SSB mode, by some firmware update?
?
73,
Yoon KM6KJI
|
Re: Ultralight vertical offer
|
Why is it that I am 2 for 2 when it comes to having ugly diodes across one of the power supply boards? After the first one, I should have known to treat the boards with a lot of respect (which I think I actually did).?
?
OK, I have to admit that debugging the problem was kind of fun.?
If I ever build another one, I may just remove all these SMD diodes and replace them with “ugly” diodes before I even start the assembly process ;)
--
Karl Heinz - K5KHK
|
Re: Ultralight vertical offer
uhm,? what article or figure?
?
?
--
Allison
------------------
Post online only,?
direct email will go to a bit bucket.
|
Re: #qmx #ssb CESSB update (Controlled Envelope SSB)
#qmx
#ssb
it kind of obsoletes QSX (at least in its originally intended format).
That brings tears to my eyes - I really bonded with the prototype that I touched back in ‘19. And then of course the bigger problem: What will I do with the QSX PA that sits here, ready for the rest of the system? ?
;)
--
Karl Heinz - K5KHK
|
Re: Ultralight vertical offer
The article shows some of the prototypes (Figure 7) I made on the way to the lightest weight version. They work fine but are just taking up shop space so I'll gladly give them away for the cost of postage. (Only the loading coil, no telescoping whip or choke but I might throw in a radial set.)?
|
Phil is right about the Pan Vise.? I used one years ago when working as a bench tech.
But,? here's one from Amazon that I've used for several years for my hobby level fun that won't break the bank.?
Velleman VTHH6-VP Circuit Board Clamping Kit, 11.81" x 6.5" x 4.92" Size
toggle quoted message
Show quoted text
On Sunday, October 6, 2024 at 05:45:53 PM EDT, PHILIP GRAITCER via groups.io <pgraitc@...> wrote:
One essential tool for all kit building is a device to hold your the object your are working on. There are lots of “third hands” on Amazon, but I prefer a PanVise. It is fully adjustable and steady as a rock. I use it to hold PC boards and model ship hulls.
Phil, K3UT
|
I actually don't have the Hakko. I have a 20 year cutter that I got back when there were real electronics shops around.?
I just searched on Amazon for "component micro cutters" and picked the Hakko picture to attach. I know that Hakko tools are pretty good.
It was listed as a top pick. And its only $5.47.?
They are not really for cutting through thick stuff, just clipping component leads or wire up to 1.3mm.
The very skinny top allows you to get at least in closely packed circuits.?
On Sun, Oct 6, 2024 at 5:30 PM, w2eck <eckerpw@...> wrote: Greg
what is the model # on your HAKKO micro lead clippers? Or Amazon link
paul w2eck
|
One essential tool for all kit building is a device to hold your the object your are working on. There are lots of “third hands” on Amazon, but I prefer a PanVise. It is fully adjustable and steady as a rock. I use it to hold PC boards and model ship hulls.
Phil, K3UT
|
Greg
what is the model # on your HAKKO micro lead clippers? Or Amazon link
paul w2eck
|
Re: 50w PA 80m version overheats transformers?
Jonas
?
note all 3 are getting hot, while only the last one experiences full output power. Note they are attached to the heat sink, so they become part of heat sink. If your DC bias current is as described in manual, things should be okay.?
once I discovered the hot regulator in my ubitx, thinking it was faulty. It’s normal. Always good to think.?
Curt wb8yyy?
?
|
Re: 50w PA 80m version overheats transformers?
Hi,
I have built the 80m version of the 50w PA. It works and delivers 35w at 20v supply. However, the transformers T1, T2, T3 gets hot to touch quickly when TX'ing. (dummy load or tuned antenna makes no difference) For instance, sending "CQ CQ CQ de SM4VEY SM4VEY SM4VEY" two times at 20 wpm makes them so hot that it affects the performance and I start hearing "clonks" after each dit and dah. Has anyone else experienced this problem?
Regards Jonas
|
|
|
Re: #qmx #ssb CESSB update (Controlled Envelope SSB)
#qmx
#ssb
Look at Walter Wirkler’s patents on SSB/split sideband transmitters filed in 1938 and assigned to Collins Radio around 1940. ?Walter was an early engineer at Collins who I think did the sideband work as part of his MSEE work in the late ‘30s. ?
This was phasing approach which, as far as I know, Collins never used until later years because the phasing networks were difficult to replicate. ?Of course, Collins used mechanical filters ( which they didn’t invent but learned to build at reasonable
cost) to provide SSB.
Wirkler was somewhat eccentric and left Collins about the time the company started SSB work because he thought that the company used more paper than aluminum building its products. ?He continued work on a number of neat projects including aircraft control
and data link programs.
73
Jim w0nkn
toggle quoted message
Show quoted text
On Oct 6, 2024, at 12:21?PM, Franz Niedermeyer via groups.io <wholeflaffer@...> wrote:
?
I agree that you could emphasize an upgrade in hardware for the proposed "QSX", such that the finals can handle a greater range of abuse from the big, bad outside world of antenna systems and power sources. ?It would be yet another step forward from the
uSDX legacy.
|
Thanks for all the info, my Amazon cart is getting really full. ??
|
Donald S Brant Jr
John Dusek