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:
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
How in the world were you able to solder the SI5351 ?
I am very very impressed!
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Re: Unresponsive ubitx V6
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
Jason,
Have you tried to recalibrate the touch screen?? I believe that is done by holding in the encoder when the power is turned on.? Should take you into the screen calibrations.
73
Evan
AC9TU
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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.
- f
How in the world were you able to solder the SI5351 ? I am very very impressed!
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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
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Farhan
Looks great.? I am impressed.
Arv _._
On Fri, Apr 16, 2021 at 2:32 PM Ashhar Farhan < farhanbox@...> 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. - f
I assume you have an acrylic cutter similar to this:
? ??
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.
? ??
?
Jerry, KE7ER
On Fri, Apr 16, 2021 at 08:38 AM, Ashhar Farhan wrote:
I use an acrylic cutter blade. It cuts very easily
toggle quoted messageShow quoted text
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Re: Linear Amplifier Build
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.
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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.
Clark Martin
KK6ISP
Yet another designated driver on the information super highway.
toggle quoted message
Show quoted text
On Apr 16, 2021, at 1:19 PM, John Cunliffe W7ZQ <n2nep@...> wrote:
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.
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I have saw like this:
It works quite well. Yet another designated driver on the information super highway.
toggle quoted message
Show quoted text
?_Dave_ AD0B wrote:? "What kind of saw do you use cut squares. A table saw set very low?? Maybe an angle grinder?"
_._,_._,_
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Re: Unresponsive ubitx V6
Jason,
Have you tried to recalibrate the touch screen?? I believe that is done by holding in the encoder when the power is turned on.? Should take you into the screen calibrations.
73
Evan
AC9TU
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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
I assume you have an acrylic cutter similar to this:
? ??
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.
? ??
?
Jerry, KE7ER
On Fri, Apr 16, 2021 at 08:38 AM, Ashhar Farhan wrote:
I use an acrylic cutter blade. It cuts very easily
toggle quoted messageShow quoted text
|
Re: Linear Amplifier Build
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
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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.
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
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Show quoted text
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Re: Unresponsive ubitx V6
If the Raduino assembly is not well connected to the main board, the easiest
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
toggle quoted message
Show quoted text
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Re: Unresponsive ubitx V6
I noticed that the penetration of the touchscreen pins into the main board - is
minimal, because of the position forced by the front panel screws. Maybe
things flexed and a pin pulled out?
- Jerry KF6VB
toggle quoted message
Show quoted text
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Re: Unresponsive ubitx V6
Hello,? I've got the same problem with my v6 too, no response from touching the screen and no changes from trying to tune either.? Checked for no other pressure points on the screen.? Any ideas anyone?
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Re: Linear Amplifier Build
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
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I assume you have an acrylic cutter similar to this: ? ?? 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/84912Vector 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
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I use an acrylic cutter blade. It cuts very easily
Dean:
Pete's a genius and has a wonderful way of "stage building" things. This is Al's and my SDT on a breadboard:
We're using a breadboard platform that Al created with his 3D printer. Some will recognize Hans rcvr in the upper-right and the JackAl (red) PCB on the left side. That's a 5" touch screen and a pitiful 1.25" speaker. We're not using the touch screen for reasons I've mentioned here before, hence all the push button switches.
Al's breadboard allows us to screw the components to the surface. He has also fashioned brackets for connectors (e.g., antenna, power, keyer, etc.). Since Al and I live about a mile from each other, the breadboard makes it easy for me to carry the SDT over to Al for testing. (Al has more and better test equipment than I do, plus the advantage of knowing what he's doing with it.)
Jack, W8TEE
On Thursday, April 15, 2021, 10:25:09 PM EDT, Dean Souleles < dsouleles@...> wrote:
I prefer al-fresco Manhattan construction...... presenting the Furlough 2040 - based on Pete Juliano's Simple SSB...? not so elegant looking - but a thing of beauty for me!??
I'm working with a Maker group of 20 guys now all building this scratch-built rig - not a printed board in sight!? Tough to toss in a backpack though!
73,
Dean?
KK4DAS
--
Jack, W8TEE
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Dear All
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
On Fri, 16 Apr 2021 at 7:14 pm, Sunil Lakhani <vu3sua@...> wrote: It's shipped? I am ok now and store is open Please help such biz we are trusted seller for years . But covid can halt any one But due to friend pray and wishes I am back to work? Regards Sunil?
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