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
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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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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
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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
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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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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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Your enclosure shipped by DHL express today . I had viral fewer have recovered now. Now our store and office has opened. Thanks for your patience. De vu3sua Sunil?
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Homebrew is alive and well in Vienna Virginia
#homebrew
Hi all -
Some exciting news to share...
20 members of the??Maker's Group are building a 100% scratch-built SSB transceiver based on , which I completed last year.? Not a bitX, but a close relative.? Pete's design using only 10 transistors combined with an Arduino/SI5351 controller.? I've extended to include CAT control, a Nextion touch screen, and made it a dual bander for 20 and and 40.? Since completing the rig last year I've worked stations on phone and digital all over the world.? This is a fun project for anyone wanting to build a transceiver from scratch.
I started the group build about six weeks ago and the first of our maker's got the receiver chain working just this week.? Read all about it and see videos and pictures of the in-progress build on my blog?
73,
Dean
KK4DAS
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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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Dave,
Something like this will work on PCB wih drill set to shallow depth. I
use a 1Hp motor stand drill.
Raj
At 16/04/2021, you wrote:
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Ash,
Thanks for the construction tips.
What kind of saw do you use cut squares. A table saw set very low??
Maybe an angle grinder?
--
73
Dave
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Ash,
Thanks for the construction tips.?
What kind of saw do you use cut squares. A table saw set very low?? Maybe an angle grinder?
--
73
Dave
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Re: Waiting with Bated Breath
Ken, I confess I have been quite new with the RPi series and had not heard of the 3A+, but it looks interesting, although 3X the price. In my case, my son gave me a Pi-zero "kit" to play with and I decided to see if I could make a cheap, lightweight and compact system to fit in the bag with my portable station. It actually works remarkably well making some allowances for processing power, and I've had many nice contacts that way. I will be demonstrating it at a local Maker Faire this weekend.
=Vic=
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Yet another designated driver on the information super highway. On Apr 15, 2021, at 9:23 PM, Tom, wb6b <wb6b@...> wrote:
In my High School electronics one of first projects was a one or two tube AM radio. The most fun part of the class was being there as students finally powered their weeks of works up, and just waiting for the various clouds of smoke --- and the best --- exploding electrolyte capacitors.?
In the same lab I previously mentioned, there was another project, a basic power supply, transformer, bridge rectifiers and a cap. Friend of mine built one and plugged it in and... bang, poof... electrolytic cap was bubbling. He yanked the plug but it kept bubbling. ?I looked it over and un-plugged the power supply. ?My friend had unplugged his soldering iron.?
The first students seem rather cavalier in powering up their radios. The following groups of students showed greater degrees of trepidation as they powered up theirs. Many, started checking out the available Simpson 260 VOMs from the tool cabinet and going over everything one more time before the power test.?
The prized construction tool of the day were Greenly chassis punches. You were an elite power builder if you had a set of those.?
Tom, wb6b
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On Wed, Apr 14, 2021 at 01:21 PM, Clark Martin wrote:
One was a simple metal chassis with three tube sockets mounted with various wires connecting pins (totally non-functional circuit) and all the wire nicely laced.
In my High School electronics one of first projects was a one or two tube AM radio. The most fun part of the class was being there as students finally powered their weeks of works up, and just waiting for the various clouds of smoke --- and the best --- exploding electrolyte capacitors.? The first students seem rather cavalier in powering up their radios. The following groups of students showed greater degrees of trepidation as they powered up theirs. Many, started checking out the available Simpson 260 VOMs from the tool cabinet and going over everything one more time before the power test.? The prized construction tool of the day were Greenly chassis punches. You were an elite power builder if you had a set of those.? Tom, wb6b
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Sunil Lakhani
Raj vu2zap
_Dave_ AD0B
Vic WA4THR