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Re: uBitx Workshop
Al It seems that many hams prefer to discourage the rest of us from soldering to SMD components.? In truth, after an hour or so of practice it becomes rather easy.? For connecting wires to an SMD device I use small (AWG-20 or 22) coil winding wire.? The laquer coating serves as insulation and the small wire size makes it easy to tack-solder to the IC pins, and resistor, or capacitor ends.? SMD standardized component size makes it easy to stack components vertically or horizontally.? Farhan laid his components flat on the substrate, but it is interesting, and maybe easier, to place resistors and capacitors on-edge. Arv _._ On Fri, Apr 16, 2021 at 3:46 PM Al - WA1CZG <alminer@...> wrote: On Fri, Apr 16, 2021 at 01:31 PM, Ashhar Farhan wrote: |
Re: Unresponsive ubitx V6
Dave Hazzard
I tried this.? The result was that the screen says "Click on the cross" but nothing happens when you click on the cross indicated on the top left of the screen.? Dave G4HUM On Fri, 16 Apr 2021, 21:36 Evan Hand, <elhandjr@...> wrote: Jason, |
Re: uBitx Workshop
On Fri, Apr 16, 2021 at 01:31 PM, Ashhar Farhan wrote:
Just to impress you people, this is on my bench. A ugly build of Si5351 using a low noise 25 mhz oscillator. All hand soldered. I bend alternate pins up and down and solder the ground and vcc to the square pads.How in the world were you able to solder the SI5351 ? I am very very impressed! |
Re: uBitx Workshop
On Fri, Apr 16, 2021 at 04:31 PM, Ashhar Farhan wrote:
Just to impress you people, this is on my bench. A ugly build of Si5351 using a low noise 25 mhz oscillator. All hand soldered. I bend alternate pins up and down and solder the ground and vcc to the square pads.Now you are just being mean!? I can't even see those pins.? Fantastic work as always. 73, Dean KK4DAS |
Re: uBitx Workshop
Farhan Looks great.? I am impressed. Arv _._ On Fri, Apr 16, 2021 at 2:32 PM Ashhar Farhan <farhanbox@...> wrote:
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Re: Linear Amplifier Build
Mark - N7EKU
Hi Jerry,
I remember the rule was that they couldn't work on 11m.? It can be complicated for a manufacturer to make an amp that will work on all HF bands except 11m, so it was simpler just to cut them off above 15m. I think the large gain restriction was because that is typically the max needed to go from your average rig's ouput to the maximum allowed power. 73. |
Re: Linear Amplifier Build
As I understand it, the 15 dB limit is to keep CBers from using one to boost their output to the kilowatt range. 15 dB limits the output to around 150W.
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Clark Martin KK6ISP Yet another designated driver on the information super highway. On Apr 16, 2021, at 1:19 PM, John Cunliffe W7ZQ <n2nep@...> wrote: |
Re: uBitx Workshop
¿ªÔÆÌåÓýI have saw like this:It works quite well. Clark Martin KK6ISP Yet another designated driver on the information super highway.
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Re: uBitx Workshop
Just to impress you people, this is on my bench. A ugly build of Si5351 using a low noise 25 mhz oscillator. All hand soldered. I bend alternate pins up and down and solder the ground and vcc to the square pads. - f On Fri 16 Apr, 2021, 11:42 PM Jerry Gaffke via , <jgaffke=[email protected]> wrote: I assume you have an acrylic cutter similar to this: |
Re: Linear Amplifier Build
John Cunliffe W7ZQ
The 15dB rule was /? is for commercial manufacturers and was in effect in the 90s when i worked for Alpha power. It might have changed but then one had problems getting type acceptance if the Amplifier had more than 15dB gain at full output power.
It never allied to home brew amps John |
Re: Unresponsive ubitx V6
The test would be to unscrew the raduino from the front panel, push it down into the main board, and see if things come back to life.
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Possibly the easiest fix would be to take the raduino subassembly apart and relieve the holes for the standoffs. So the board can go down a bit lower with respect to the front panel. Another possibility - if you have good soldering skills & equipment - would be to unsolder the connector from the main board, shim it up so it stands a mm or so high, and resolder it. - Jerry KF6VB On 2021-04-16 12:20, Dave Hazzard wrote:
Hi Jerry |
Re: Unresponsive ubitx V6
Dave Hazzard
Hi Jerry Cheers for that point.? I'll check it out.? Regards Dave I noticed that the penetration of the touchscreen pins into the main |
Re: Unresponsive ubitx V6
If the Raduino assembly is not well connected to the main board, the easiest
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fix might be to put the main board on washers - one washer under each mount point. But you would have to enlarge each and every hole where the main board has stuff that pokes out - RF connector, phone plugs, volume control etc. - Jerry KF6VB On 2021-04-16 12:13, Dave Hazzard wrote:
Hello, I've got the same problem with my v6 too, no response from |
Re: Unresponsive ubitx V6
I noticed that the penetration of the touchscreen pins into the main board - is
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minimal, because of the position forced by the front panel screws. Maybe things flexed and a pin pulled out? - Jerry KF6VB On 2021-04-16 12:13, Dave Hazzard wrote:
Hello, I've got the same problem with my v6 too, no response from |
Re: Linear Amplifier Build
Timothy Fidler
Jerry, there is? quote from Raj about that rule - a refrence to the FCC reg. I believe it? has come from past experience that ampw with a greater gain tend to become unstable?
in worst case or real world situations.? But it also sounds like a nonsense...why cannot? an amp internally have two 8dB stages, both unconditionally stable and some how the? cascaded gain of 16 dB is deemed unstable.? Beats Me.? Tim Fidler NzL |
Re: uBitx Workshop
I assume you have an acrylic cutter similar to this:
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? ?? And that you make two parallel cuts into the copper layer, then pick at that copper somehow to remove it. I've done that sort of thing with an exacto knife, but the hook in the acrylic cutter looks better suited for the task. ?_Dave_ AD0B wrote:? "What kind of saw do you use cut squares. A table saw set very low?? Maybe an angle grinder?" For a regular pattern of squares cut only into the copper, keeping the board intact, seems a table saw with a the blade set low would work quite well, especially if you have the right blade. Clamping that angle grinder or a Dremmel tool somehow so the blade is just above the surface of your work table could work about the same. Use strips of wood of varying width to position the pcb as you slide it under the blade. To get the height just right, add pieces of pcb and sheets of paper under the work surface that you slide the board over. A "spot weld drill bit" can also be used to create islands of copper,? or to cut all the way through and make a manhatten pad. I use CEM-1 board material instead of FR4 fiberglass-epoxy when messing around. Easier on the tools, easier for me to work with, cheap. ? ? /g/BITX20/message/84912 Vector type prototyping boards can also work, but you have to figure out how to give it a solid ground plane. ? ??https://www.amazon.com/uxcell-Universal-Printed-Circuit-Soldering/dp/B07FK3Q6FV ? Jerry, KE7ER On Fri, Apr 16, 2021 at 08:38 AM, Ashhar Farhan wrote:
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Re: uBitx Workshop
I use an acrylic cutter blade. It cuts very easily On Fri 16 Apr, 2021, 5:57 PM Jack, W8TEE via , <jjpurdum=[email protected]> wrote:
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Re: Is ¡°Inkits¡± open?
Dear All
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Sunil had undergone Covid test they came negative yet due to fever issue he had to go for CAT scan where Covid came positive.? By the grace of almighty he has recovered after 17 days of treatment.? Today on first instance of recovery he has gone to dispatch the orders.? He lives in my town Lucknow in North Central india but unfortunately I too cannot visit him given the pandemic conditions.? Let's hope for best for all 73 Rahul VU3WJM
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