On 16/12/2025 06:50, c186282 wrote:
On 12/15/25 12:49, The Natural Philosopher wrote:LOL
On 15/12/2025 06:55, c186282 wrote:
In his app, does he even NEED "real time" ?
"Close Enough" may be Good Enough perhaps.
No,m I get a report every two hours
So seven milliseconds is CRITICAL obviously :-)
It was cheaper to send the files to china than buy the kit..I did design my own PCBs
I've done a number from scratch ... photo-masks,
evil chemicals, the whole bit.
https://dirtypcbs.com
Back in about 10 days at silly prices.
SOME use XYZ mini-routers to literally machine-outAh. Mr Usagi.
copper from boards. Ugly, but DOES work for many
applications.
Some use 3D printers to deposit low melting point solder as well
We use what we have to hand. I use cCorel draw. There is an online
facility that turns that into the right format for PCB manufaturers.
Yes. That reminds me, I need to put the watchdog in some of my daemons too But in the case of the oil sensor clienbt this is physical 'shut off all power and stay down for two hours' Draws about 50nA in that periodI have a nano timer that reboots the board every 2 hours and then the
pi shuts itself off again.
I have a few PIs that just use crontab to
reboot once/twice/thrice a day. Working on
cleaning up the app that clutters/slows
them down. Found some of the problems.
Now STARTING a Pi from scratch a few timesLooked at all that. Not good enough. I was going to build a CMOS timer
a day, THEN you need an external timer device.
Microcontrollers, most have low-power libraries
that 99.99% shut 'em down until there's an interrupt,
perhaps from a time chip. PIs however - they're
natural power hogs ... NOT good for battery/solar
operation.
then I stumbled across the TP1550 chip.
liitle 'breakout' boards were dirt cheap
I used a lot of Ard 2560s for solar field devices.I used my sillyscope to see why the *!%$£ things was oscillating under power.
They have low-power libs and reduce to seriously
low current draw. DID slice the traces out of
the cheapo time chip on the board and used
"ChronoDots" instead. Interrupt, and it all
comes back to life.
Oh, where an oSillyScope is a good thing ... had
an odd issue where the board would reset for no
obvious reason. Turned out I'd attached the time
chip to a current-limited line ALSO shared by an
external device. The device didn't use much power
EXCEPT for maybe a sub-millisecond when it powered
up. Probably caps charging. FOUND that deadly
voltage dip with a scope, little else would have.
Had kept looking for a software problem, but ...
turned out to need serious capacitance on the output to stop the wrong
sort of feedback triggering it
On 16/12/2025 06:50, c186282 wrote:
On 12/15/25 12:49, The Natural Philosopher wrote:LOL
On 15/12/2025 06:55, c186282 wrote:
In his app, does he even NEED "real time" ?
"Close Enough" may be Good Enough perhaps.
No,m I get a report every two hours
So seven milliseconds is CRITICAL obviously :-)
It was cheaper to send the files to china than buy the kit..I did design my own PCBs
I've done a number from scratch ... photo-masks,
evil chemicals, the whole bit.
https://dirtypcbs.com
Back in about 10 days at silly prices.
SOME use XYZ mini-routers to literally machine-outAh. Mr Usagi.
copper from boards. Ugly, but DOES work for many
applications.
Some use 3D printers to deposit low melting point solder as well
We use what we have to hand. I use cCorel draw. There is an online
facility that turns that into the right format for PCB manufaturers.
Yes. That reminds me, I need to put the watchdog in some of my daemons too But in the case of the oil sensor clienbt this is physical 'shut off all power and stay down for two hours' Draws about 50nA in that periodI have a nano timer that reboots the board every 2 hours and then the
pi shuts itself off again.
I have a few PIs that just use crontab to
reboot once/twice/thrice a day. Working on
cleaning up the app that clutters/slows
them down. Found some of the problems.
Now STARTING a Pi from scratch a few timesLooked at all that. Not good enough. I was going to build a CMOS timer
a day, THEN you need an external timer device.
Microcontrollers, most have low-power libraries
that 99.99% shut 'em down until there's an interrupt,
perhaps from a time chip. PIs however - they're
natural power hogs ... NOT good for battery/solar
operation.
then I stumbled across the TP1550 chip.
liitle 'breakout' boards were dirt cheap
I used a lot of Ard 2560s for solar field devices.I used my sillyscope to see why the *!%$£ things was oscillating under power.
They have low-power libs and reduce to seriously
low current draw. DID slice the traces out of
the cheapo time chip on the board and used
"ChronoDots" instead. Interrupt, and it all
comes back to life.
Oh, where an oSillyScope is a good thing ... had
an odd issue where the board would reset for no
obvious reason. Turned out I'd attached the time
chip to a current-limited line ALSO shared by an
external device. The device didn't use much power
EXCEPT for maybe a sub-millisecond when it powered
up. Probably caps charging. FOUND that deadly
voltage dip with a scope, little else would have.
Had kept looking for a software problem, but ...
turned out to need serious capacitance on the output to stop the wrong
sort of feedback triggering it
On 2025-12-15 07:55, c186282 wrote:
On 12/14/25 13:23, Fritz Wuehler wrote:
The Natural Philosopher <...@invalid.invalid> [TNP]:
Depending on how long the batteries last I may increase the
frequency of operation. But it can never be 'real time'
Have you considered using a couple of old 12V car/motorcycle batteries
(one at a time) instead?
Those are BIG (and heavy and need special recharge).
At least they don't detonate like Li-Ion batts.
Had a weather station that used up batteries too fast.
Wanted to convert it to solar charge with a small lead
battery - 6v. Well, first you needed a 9-12v solar
panel, easy enough, but then a converter to get that
into the range a dedicated lead/acid charger could
cope with AND the charger could NOT cause the circuit
to see any more than 6v regardless of sun levels.
Turned into a MESS.
Solution ... 9v little solar, a resistor bridge to
drop to about 6.5v and a 10w zener to suck up any
over-voltage across the device power leads. The batt
just got a small harmless 'trickle charge' which was
enough to deal. Less tech = MORE in this case.
Doesn't anybody sell, ready to use, solar panel plus battery and
controller, ready to use?
On 12/16/25 14:31, Carlos E.R. wrote:
On 2025-12-15 07:55, c186282 wrote:Via DuckDuckGo using your terms above.
On 12/14/25 13:23, Fritz Wuehler wrote:
The Natural Philosopher <...@invalid.invalid> [TNP]:
Depending on how long the batteries last I may increase the
frequency of operation. But it can never be 'real time'
Have you considered using a couple of old 12V car/motorcycle batteries >>>> (one at a time) instead?
Those are BIG (and heavy and need special recharge).
At least they don't detonate like Li-Ion batts.
Had a weather station that used up batteries too fast.
Wanted to convert it to solar charge with a small lead
battery - 6v. Well, first you needed a 9-12v solar
panel, easy enough, but then a converter to get that
into the range a dedicated lead/acid charger could
cope with AND the charger could NOT cause the circuit
to see any more than 6v regardless of sun levels.
Turned into a MESS.
Solution ... 9v little solar, a resistor bridge to
drop to about 6.5v and a 10w zener to suck up any
over-voltage across the device power leads. The batt
just got a small harmless 'trickle charge' which was
enough to deal. Less tech = MORE in this case.
Doesn't anybody sell, ready to use, solar panel plus battery and
controller, ready to use?
<https://www.amazon.com/Renogy-200-Watt-Monocrystalline-Controller/dp/ B07RFQVB9M>
On 16/12/2025 20:40, rbowman wrote:
On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote:
On 16/12/2025 06:50, c186282 wrote:
On 12/15/25 12:49, The Natural Philosopher wrote:LOL
On 15/12/2025 06:55, c186282 wrote:
In his app, does he even NEED "real time" ?
"Close Enough" may be Good Enough perhaps.
No,m I get a report every two hours
So seven milliseconds is CRITICAL obviously
It was cheaper to send the files to china than buy the kit..I did design my own PCBs
I've done a number from scratch ... photo-masks,
evil chemicals, the whole bit.
I wish I had that option back in the '70s. Doing the art work, creating
the silk screens, etching, and drilling was a pain in the ass.
Fortunately
I hired an older woman who knew more about the etching part than I did
and
a lesbian who was happy to stand in front of a Bridgeport punching holes.
I got funny looks from the management since it was an all male shop
except
for the front office but they weren't DEI hires. They were the best
candidates for the positions.
Back in the 1970s I worked for companies that could pay the rates for commercial prototypes.
But I built it all on pegboard first.
Oh, 'solar-rechargers/power-banks' for phones and such, many are
reported to be very UNSAFE, prone to fires. Little/no regulation or
safety features.
Sorry, $19.95 won't buy you everything ....
On Wed, 17 Dec 2025 01:20:14 -0500, c186282 wrote:
Oh, 'solar-rechargers/power-banks' for phones and such, many are
reported to be very UNSAFE, prone to fires. Little/no regulation or
safety features.
Sorry, $19.95 won't buy you everything ....
They're probably improved but a friend had a solar device to recharge
NiCad AAs. It worked, if you had 4 days to spare in southern Arizona.
On 12/16/25 20:05, The Natural Philosopher wrote:
On 16/12/2025 20:40, rbowman wrote:
On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote:
On 16/12/2025 06:50, c186282 wrote:
On 12/15/25 12:49, The Natural Philosopher wrote:LOL
On 15/12/2025 06:55, c186282 wrote:
In his app, does he even NEED "real time" ?
"Close Enough" may be Good Enough perhaps.
No,m I get a report every two hours
So seven milliseconds is CRITICAL obviously
It was cheaper to send the files to china than buy the kit..I did design my own PCBs
I've done a number from scratch ... photo-masks,
evil chemicals, the whole bit.
I wish I had that option back in the '70s. Doing the art work, creating
the silk screens, etching, and drilling was a pain in the ass.
Fortunately
I hired an older woman who knew more about the etching part than I
did and
a lesbian who was happy to stand in front of a Bridgeport punching
holes.
I got funny looks from the management since it was an all male shop
except
for the front office but they weren't DEI hires. They were the best
candidates for the positions.
Back in the 1970s I worked for companies that could pay the rates for
commercial prototypes.
But I built it all on pegboard first.
Mostly good ... but if it's higher-frequency circuits
you can't properly proto on such a board. You need a
REAL board to see if there are HF/RF cross-over and
capacitance problems and such. Sometimes just slight
repositioning of the traces can have large effects.
Oh, wifi, had a remote PI on my network. Performance
had become horrible since I got a new router+wifi.
Moved it exactly FOUR INCHES plus a slight rotation
the other day and the data rate went up 5X :-)
Black magic !
DISadvantage of really long range - you become
noticed/attractive to possibly malicious neighbors.
They can let something like 'hydra' run for a
week and find yer PW by brute force if they want.
On 17/12/2025 06:55, c186282 wrote:
On 12/16/25 20:05, The Natural Philosopher wrote:Yes. The RF board got to revision 13...
On 16/12/2025 20:40, rbowman wrote:
On Tue, 16 Dec 2025 10:43:05 +0000, The Natural Philosopher wrote:
On 16/12/2025 06:50, c186282 wrote:
On 12/15/25 12:49, The Natural Philosopher wrote:LOL
On 15/12/2025 06:55, c186282 wrote:
In his app, does he even NEED "real time" ?
"Close Enough" may be Good Enough perhaps.
No,m I get a report every two hours
So seven milliseconds is CRITICAL obviously
It was cheaper to send the files to china than buy the kit..I did design my own PCBs
I've done a number from scratch ... photo-masks,
evil chemicals, the whole bit.
I wish I had that option back in the '70s. Doing the art work, creating >>>> the silk screens, etching, and drilling was a pain in the ass.
Fortunately
I hired an older woman who knew more about the etching part than I
did and
a lesbian who was happy to stand in front of a Bridgeport punching
holes.
I got funny looks from the management since it was an all male shop
except
for the front office but they weren't DEI hires. They were the best
candidates for the positions.
Back in the 1970s I worked for companies that could pay the rates for
commercial prototypes.
But I built it all on pegboard first.
Mostly good ... but if it's higher-frequency circuits
you can't properly proto on such a board. You need a
REAL board to see if there are HF/RF cross-over and
capacitance problems and such. Sometimes just slight
repositioning of the traces can have large effects.
Oh, wifi, had a remote PI on my network. Performance
had become horrible since I got a new router+wifi.
Moved it exactly FOUR INCHES plus a slight rotation
the other day and the data rate went up 5X :-)
Black magic !
...
DISadvantage of really long range - you become
noticed/attractive to possibly malicious neighbors.
They can let something like 'hydra' run for a
week and find yer PW by brute force if they want.
Nearest neighbour is outside wifi range. 250 metres or more.
On 2025-12-15 07:55, c186282 wrote:
On 12/14/25 13:23, Fritz Wuehler wrote:
The Natural Philosopher <...@invalid.invalid> [TNP]:
Depending on how long the batteries last I may increase the
frequency of operation. But it can never be 'real time'
Have you considered using a couple of old 12V car/motorcycle batteries
(one at a time) instead?
Those are BIG (and heavy and need special recharge).
At least they don't detonate like Li-Ion batts.
Had a weather station that used up batteries too fast.
Wanted to convert it to solar charge with a small lead
battery - 6v. Well, first you needed a 9-12v solar
panel, easy enough, but then a converter to get that
into the range a dedicated lead/acid charger could
cope with AND the charger could NOT cause the circuit
to see any more than 6v regardless of sun levels.
Turned into a MESS.
Solution ... 9v little solar, a resistor bridge to
drop to about 6.5v and a 10w zener to suck up any
over-voltage across the device power leads. The batt
just got a small harmless 'trickle charge' which was
enough to deal. Less tech = MORE in this case.
Doesn't anybody sell, ready to use, solar panel plus battery and
controller, ready to use?
On 12/17/25 05:31, The Natural Philosopher wrote:
On 17/12/2025 06:55, c186282 wrote:
Nearest neighbour is outside wifi range. 250 metres or more.
Lucky !
I have more nearby.
At least ONE might be an asshole. I think they
injected a load of NAZI bullshit into my old
printer - only stopped because all the paper
was used up. Getting into a printer directly
like that is not dead newbie skills.
On 2025-12-17 12:25, c186282 wrote:
On 12/17/25 05:31, The Natural Philosopher wrote:
On 17/12/2025 06:55, c186282 wrote:
Nearest neighbour is outside wifi range. 250 metres or more.
Lucky !
I have more nearby.
At least ONE might be an asshole. I think they
injected a load of NAZI bullshit into my old
printer - only stopped because all the paper
was used up. Getting into a printer directly
like that is not dead newbie skills.
Maybe there is a virus that does that.
On 12/18/25 13:00, Carlos E.R. wrote:
On 2025-12-17 12:25, c186282 wrote:
On 12/17/25 05:31, The Natural Philosopher wrote:
On 17/12/2025 06:55, c186282 wrote:
Nearest neighbour is outside wifi range. 250 metres or more.
Lucky !
I have more nearby.
At least ONE might be an asshole. I think they
injected a load of NAZI bullshit into my old
printer - only stopped because all the paper
was used up. Getting into a printer directly
like that is not dead newbie skills.
Maybe there is a virus that does that.
Nah ... it was some "helpful" connectivity protocol
HOPEFULLY from yesteryear. The printer would ID and
let anybody anywhere dump stuff into it directly
via wifi.
Was never sure I managed to turn that off entirely,
so I had to keep the printer turned off instead.
I do SUSPECT who the perp was ... fortunately he
grew up and switched over to loud hot-rods instead :-)
On 2025-12-19 06:55, c186282 wrote:
On 12/18/25 13:00, Carlos E.R. wrote:
On 2025-12-17 12:25, c186282 wrote:
On 12/17/25 05:31, The Natural Philosopher wrote:
On 17/12/2025 06:55, c186282 wrote:
Nearest neighbour is outside wifi range. 250 metres or more.
Lucky !
I have more nearby.
At least ONE might be an asshole. I think they
injected a load of NAZI bullshit into my old
printer - only stopped because all the paper
was used up. Getting into a printer directly
like that is not dead newbie skills.
Maybe there is a virus that does that.
Nah ... it was some "helpful" connectivity protocol
HOPEFULLY from yesteryear. The printer would ID and
let anybody anywhere dump stuff into it directly
via wifi.
Was never sure I managed to turn that off entirely,
so I had to keep the printer turned off instead.
I do SUSPECT who the perp was ... fortunately he
grew up and switched over to loud hot-rods instead :-)
The router should block attempts to connect to internal printers from outside.
On 12/19/25 09:16, Carlos E.R. wrote:
On 2025-12-19 06:55, c186282 wrote:
On 12/18/25 13:00, Carlos E.R. wrote:
On 2025-12-17 12:25, c186282 wrote:
On 12/17/25 05:31, The Natural Philosopher wrote:
On 17/12/2025 06:55, c186282 wrote:
Nearest neighbour is outside wifi range. 250 metres or more.
Lucky !
I have more nearby.
At least ONE might be an asshole. I think they
injected a load of NAZI bullshit into my old
printer - only stopped because all the paper
was used up. Getting into a printer directly
like that is not dead newbie skills.
Maybe there is a virus that does that.
Nah ... it was some "helpful" connectivity protocol
HOPEFULLY from yesteryear. The printer would ID and
let anybody anywhere dump stuff into it directly
via wifi.
Was never sure I managed to turn that off entirely,
so I had to keep the printer turned off instead.
I do SUSPECT who the perp was ... fortunately he
grew up and switched over to loud hot-rods instead :-)
The router should block attempts to connect to internal printers from
outside.
Oh NO NO NO ! THIS protocol was made for "convenience"
and works (hopefully WORKED) entirely within the printer.
The IDEA was to make it hyper-simple for people in an
office to connect direct to the printer, even by wifi.
Didn't matter if the router/main-PC was on or not.
If I can find the manual I'll report the exact protocol.
The printer is now on the JUNK pile ... leaks blue
toner to the max. NOT worth trying to fix. Got
a new color-laser all-purpose unit - do NOT
enable anything 'net' however. Use thumb-drives
to xfer stuff.
Hmmm ... gotta look up local JUNK services to take
it, and a bunch of other old stuff, AWAY. My
damned house has 3+ generations of STUFF inherited
inside it, the junk piles are getting large ....
have a VIC-20 buried under there somewhere, Sinclair
ZX-81, Apple II, bits of a DEC-based H-11, even
one of those Radio-Shack "original laptops" meant
for news reporters (with actual Bill Gates code
inside it). Never mind all the crap from Weird Aunts.
Wow ........
No, not gonna bother with e-Bay - don't like it.
Money paradigm is a bit iffy for my tastes plus
I'd actually have to pack/box stuff and take it
to UPS or FedEx or whatever .........
Can't even LIFT the H-11 dual 8" disk unit
anymore ......
Home made with a box of Pringles. just google for "pringles wifi antenna".
On 11/12/2025 21:18, Carlos E.R. wrote:
Home made with a box of Pringles. just google for "pringles wifi
antenna".
Also Google cutoff frequency and see that the Pringle tube is too small
in diameter to be effective at 2.4GHz.
Of course, designs on the internet do not have to follow the laws of physics! :-)
On 24/12/2025 07:58, mm0fmf wrote:
On 11/12/2025 21:18, Carlos E.R. wrote:Assuming that is a relevant issue.
Home made with a box of Pringles. just google for "pringles wifi
antenna".
Also Google cutoff frequency and see that the Pringle tube is too
small in diameter to be effective at 2.4GHz.
Shouting down a pipe whose diameter is way less than the wavlength of
voice frequencies, still works....
Of course, designs on the internet do not have to follow the laws of
physics! :-)
..especially for people who don't fully understand them...
On 24/12/2025 12:16, The Natural Philosopher wrote:
On 24/12/2025 07:58, mm0fmf wrote:
On 11/12/2025 21:18, Carlos E.R. wrote:Assuming that is a relevant issue.
Home made with a box of Pringles. just google for "pringles wifi
antenna".
Also Google cutoff frequency and see that the Pringle tube is too
small in diameter to be effective at 2.4GHz.
Shouting down a pipe whose diameter is way less than the wavlength of
voice frequencies, still works....
Of course, designs on the internet do not have to follow the laws of
physics! :-)
..especially for people who don't fully understand them...
Indeed. And I'm sure you are perfectly well aware of the difference
between longitudinal sound waves propagating down a narrow pipe and transverse electromagnetic waves in a waveguide.
If a Pringles can were highly conductive it would have a cutoffA statement which clearly contradicts the well known skin effect of
frequency of close to 2.4GHz so the attenuation would be very high.
However, a very thin layer of aluminium on the inside of a cardboard
tube will be so resistive that it will not make a lot of difference.
For many purposes a well made half-wave dipole or quarter-wave
monopole gives excellent results which are far better than anything
that can be achieved with small pcb antennas.
A quarter wave monopole made from relatively thick wire or rod can
be an excellent match to 50 ohm coax so long as the ground plane
is at least a few wavelengths across.
A half-wave dipole combined with a coaxial balun can also be a very
good match but has a slightly narrower bandwidth due to the
frequency dependency of the coax balun. The choice of which one to
use depends mostly on how the antenna is to be mounted.
An almost omnidirectional antenna with very low losses can be
more effective than a lossy directional one.
John
What I learned was that theory is too simplified to actually be able to design a real antenna: All our designs were field tested and adjusted.
I am not advocating Pringle cans. I wouldnt use one myself. But I am
not so quick to rubbish them as you are.
RF propagation is tricky, and real world objects of no apparent value
often have enormous effects.
On Wed, 24 Dec 2025 14:23:45 +0000
The Natural Philosopher <tnp@invalid.invalid> wrote:
[]
What I learned was that theory is too simplified to actually be able toPrsumably you're saying Mythbusters-style "not proven"?
design a real antenna: All our designs were field tested and adjusted.
I am not advocating Pringle cans. I wouldnt use one myself. But I am
not so quick to rubbish them as you are.
RF propagation is tricky, and real world objects of no apparent value
often have enormous effects.
On 11/12/2025 21:18, Carlos E.R. wrote:
Home made with a box of Pringles. just google for "pringles wifi antenna".
Also Google cutoff frequency and see that the Pringle tube is too small
in diameter to be effective at 2.4GHz.
Of course, designs on the internet do not have to follow the laws of physics! :-)
On 24/12/2025 12:16, The Natural Philosopher wrote:
On 24/12/2025 07:58, mm0fmf wrote:
On 11/12/2025 21:18, Carlos E.R. wrote:Assuming that is a relevant issue.
Home made with a box of Pringles. just google for "pringles wifi
antenna".
Also Google cutoff frequency and see that the Pringle tube is too
small in diameter to be effective at 2.4GHz.
Shouting down a pipe whose diameter is way less than the wavlength of
voice frequencies, still works....
Of course, designs on the internet do not have to follow the laws of
physics! :-)
..especially for people who don't fully understand them...
Indeed. And I'm sure you are perfectly well aware of the difference
between longitudinal sound waves propagating down a narrow pipe and transverse electromagnetic waves in a waveguide.
If a Pringles can were highly conductive it would have a cutoff
frequency of close to 2.4GHz so the attenuation would be very high.
However, a very thin layer of aluminium on the inside of a cardboard
tube will be so resistive that it will not make a lot of difference.
For many purposes a well made half-wave dipole or quarter-wave
monopole gives excellent results which are far better than anything
that can be achieved with small pcb antennas.
A quarter wave monopole made from relatively thick wire or rod can
be an excellent match to 50 ohm coax so long as the ground plane
is at least a few wavelengths across.
A half-wave dipole combined with a coaxial balun can also be a very
good match but has a slightly narrower bandwidth due to the
frequency dependency of the coax balun. The choice of which one to
use depends mostly on how the antenna is to be mounted.
An almost omnidirectional antenna with very low losses can be
more effective than a lossy directional one.
John
With Gigahertz, as with Heffalumps, you never know...
On 24/12/2025 17:00, Kerr-Mudd, John wrote:
On Wed, 24 Dec 2025 14:23:45 +0000I am saying that a blanket denial 'because the theory says no' is not
The Natural Philosopher <tnp@invalid.invalid> wrote:
[]
What I learned was that theory is too simplified to actually be able toPrsumably you're saying Mythbusters-style "not proven"?
design a real antenna: All our designs were field tested and adjusted.
I am not advocating Pringle cans. I wouldnt use one myself. But I am
not so quick to rubbish them as you are.
RF propagation is tricky, and real world objects of no apparent value
often have enormous effects.
good enough for me, personally.
To make a waveguide, which is analysable, is quite tricky. To throw something in place that 'does something' and clearly is *not* a
waveguide, and is essentially unanalysable, is another matter.
With Gigahertz, as with Heffalumps, you never know...
On 24/12/2025 07:58, mm0fmf wrote:
On 11/12/2025 21:18, Carlos E.R. wrote:Assuming that is a relevant issue.
Home made with a box of Pringles. just google for "pringles wifi
antenna".
Also Google cutoff frequency and see that the Pringle tube is too small
in diameter to be effective at 2.4GHz.
Shouting down a pipe whose diameter is way less than the wavlength of
voice frequencies, still works....
On 24/12/2025 20:07, The Natural Philosopher wrote:
With Gigahertz, as with Heffalumps, you never know...
Some of us do know.
On 24/12/2025 23:17, mm0fmf wrote:
On 24/12/2025 20:07, The Natural Philosopher wrote:
With Gigahertz, as with Heffalumps, you never know...
Some of us do know.
Some of us have worked with RF.
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