Re: uBitx V6 firmware 1.2 upgrade
On Fri, Jan 1, 2021 at 02:32 PM, Jon wrote:
I am looking for someone to tell how to put this firmware into the Arduino IDE? I have not unzipped it yet....
I have followed KD8CEC this, far and do I need Xloader to do it? or how? I tried to download Xloader and it said it was a bad site to go to?
Could I use Balena Etcher?
Jon, Before you try to flash the KD8CEC firmware, do you have the Nextion screen and the correct program for it?? The KD8CEC firmware will not work with the stock uBITX screen. Since Xloader is free, the author did not register the program with Microsoft or any other program verification site.? As such it will trip the warning when you go to download it.? I have bypassed the warning and not had issues.? I cannot vouch for the site that you are using but would think that it is OK. If you do not want to trust the Xloader site/program, then you have two options: 1 - download the source code, set the correct #defines in the ubitx.h tab in the Arduino IDE.? The zip file contains only hex files that need a hex loader.? Balena Etcher would not work as far as I know. or 2 - follow the instructions in this link to use the Arduino uploader without compiling the source: To make sure all know how to help you, can you tell us what you want to accomplish by switching to the KD8CEC firmware?? 73 Evan AC9TU
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Re: Broke off screw mounts from screen
Hello Bob, Nice to know you like football. Hey, yeah, we¡¯re world champions. But I¡¯d still watch the Super Bowl. The 2021 Super Bowl will take place on February 7 in Tampa, Florida. cdt
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Hello and Happy New Year!
My name is Mircea Alex. Nemes.
I recently ordered and received the BITX V6 transceiver relatively
quickly. I assembled this transceiver without any problem, it started the transceiver
but it has no reception in any band. The touch screen works, you can
change the frequency but apart from the background noise you can't hear
anything (neither voice nor CW).
I appreciate any help in solving the problem with the lack of reception.
Thank you,
Alex Nemes
KK4FAA
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Re: uBitx V6 firmware 1.2 upgrade
I used the arduino program to put on the firmware, but...i had some problems until i switched the arduino program to "old Boodloder"
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Re: Broke off screw mounts from screen
Buy some new??, you have to pull out the screw under it also and renew them. maybe wallmarkt?? or srab box??
regards,
Rene
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Re: Problems with connecting to computer for digital
Unfortunately intermittently my Win10 or a running APP does not release one of my Comm ports. Often shutting down all apps and trying again seems to resolve it. When that doesn't work try a restart of Win10 and only run the app that is reporting com port issues. Failing that try another app that does use that same com port and rarely has issues. Basically trust nothing Usb ports, Virtual com ports eg Usb to serial, usb cables and of course the OS itself. Find what works and continue careful testing. Good luck.
On Sat, 2 Jan 2021, 1:48 am Matt Towe, < Lizooki@...> wrote: It's most likely a win10 update bomb.
Try unplugging the radio from the computer then plugging it back in.
After a year of running The N4PY Pegasus Plus software to control my Ten Tec Jupiter I suddenly started getting "does not exist" errors for my comport.
Unplugging the usb and plugging it back in after a few seconds is the only thing that works.
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Re: VARIATIONS IN SWR WHEN CONNECTING LINEAR AMP
Hello Muthu,
What do you use to switch the linear on / off?
What do you use to switch the linear to transmit / receive?
I think it could be the switching contacts, I don't see any other reasons.
Are you sure that when the linear is on, the connection between the linear and the antenna is coaxial and without any short circuits or unstable connections?
The only thing that comes to mind is to carefully check all connections and the switching relays of the linear.
-- IW4AJR Loris
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Re: Contained Power supply
Easy to find in a desktop brick.
Curiously, it appears that going to 5A does not raise the price.
? ??
Anybody have experience with any of those brand names,
able to recommend one with low noise?
A better source might be a local second hand shop.
Jeff has enough money already.
They may not work well when pushed to the limit, as Arv suggests.
So going to 5A seems a good bet.
But do put a 3A fuse inline somehow, and check polarity with a voltmeter before plugging it into your rig.
If a switcher is too noisy, you could add a filter between the power supply and the rig.
Adding a 1000uF (or more) 25vdc electrolytic cap at the rig from +12v to ground might be sufficient.
The connector given with the uBitx is 5.5x2.1mm, which is the most common size.
The outside of the plug barrel is 5.5mm, the pin in the jack is 2.1mm in diameter.
Second most common sizeis 5.5x2.5mm.
A 5.5x2.5mm plug will fit into a 5.5x2.1mm jack and you may not? notice anything wrong,
but the center pin is not making much contact when you do that.
Jerry, KE7ER
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On Fri, Jan 1, 2021 at 03:48 PM, Arv Evans wrote:
Sounds like you are looking for a wall-wart that has current enough, heavy enough wire size, and filtering enough for a uBITX.? That might be very difficult to find.??
?
Very few wall-warts do over 2 amps but you need 3 amps for a uBITX.? Most wall-warts do not have enough filtering for operation at near maximum current.
?
Arv
_-_
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?
I know I can use a bench supply, but does anyone have a good suggestion to one with the barrel already on it?
thanks!
?
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Re: Ideas for "bulletproofing" the uBitx
The Index Labs QRP Plus comes to mind. I believe they made over a thousand of them back in the early 90s. True it¡¯s not a Icom, Kenwood, Yaesu, Ten Tec, or Elecraft yet it did use a IRF510 in the final. Also many of the QRP radios of that era the original finals are now unattainable including the beloved FT817¡¯s original finals.?
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On Jan 1, 2021, at 11:39, MadRadioModder <madradiomodder@...> wrote:
? Here¡¯s the tell.? Name one name brand commercial radio that uses IRF510¡¯s as RF transistors. ? ? Mad,
Thousands of stock uBit's are operating with no trouble at all.
If the IRF510's die at all, It is almost certainly because of overheating.
Perhaps when running some digital mode, inside an enclosure, with zero airflow..
Many of the reports of blown IRF510's can be attributed to people fiddling with the gate bias pots
without first spending 10 minutes to figure out what they are doing.?
The "clockwise is minimum" pot rotation plays a big factor.
Going to RD16HHF1's will only make this mistake much more expensive.
The uBitx is designed to be a minimalist SSB rig for all of HF at minimum cost, and succeeds wildly.
If it is to be used continuously at full power in digital modes, the minimalist heatsinks should be improved.
I can imagine that a shorted antenna jack (thus infinite SWR) could play a role.
But only because the IRF510's might heat up after some period of time.
Many in the forum run the IRF510's at around 20 volts for increased power.
With an adequate heatsink, this works reliably.
If you insist on telling them they should switch over to "real" RF devices such as the RD16HHF1,
you should also warn them?not to run at much beyond 12 volts.
The qrp-labs 10W PA blows away the many claims over the years in this forum
that the IRF510's are not suitable as RF transistors.?
It simply works, flat and clean, from 3.5 to 30mhz.
And is bulletproof when operated at 12v, even when presented with a worst case SWR.
The uBitx IRF510's can be just as reliable if given a suitable heatsink.
Jerry, KE7ER
On Fri, Jan 1, 2021 at 01:31 AM, MadRadioModder wrote: Don¡¯t understand the point.? Why would you want to operate excellent RF transistors designed specifically for the 12-14V mobile world at a higher voltage?? They make all of their power in that range. ? You are correct¡ that most people won¡¯t get much out of replacing IRF devices with the RDs¡? until they blow out a set or two of them.? Then it will start to matter, because the RD devices survive much better under bad circumstances like infinite SWR.? Again, real RF transistors designed for load mismatch tolerance ?(read the app note, load tolerance spec).? Bullet-proof. ? You are also correct that most people won¡¯t spend the time to replace the IRF devices for the RD devices even after they kill a few sets.? They will just keep killing IRF510¡¯s. ?
-- ¡_. _._
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Re: Broke off screw mounts from screen
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Loris, one parting comment here is that the person who is most convinced is he who can convince himself. Seems that people tend to believe and accept something easiest is the person who believes he "discovered" something that may have been shown him by someone else previously. Human nature.
Thanks for the interesting discussion.
Bob ¡ª KK5R
On Friday, January 1, 2021, 4:58:44 PM EST, Loris IW4AJR via <lorisbollina= [email protected]> wrote:
Bob,
Well, personal tastes can be applied to many parts of our life, but not to science and mathematics, the thing that amazes me most is that all of us as OMs talk about kilometers, meters, centimeters and millimeters when we think of "lengths of "wave", we quietly call them kilometer, decametric, metric, down to the millimeter, but some used stupid habits to justify feet and inches in mechanical measurements ...
Mysteries of the human mind ...
Yet just as radio amateurs we know that it is enough to study a little (and not so much) to adapt to the choices of science ...
I also struggled when in astronomy we went from the common use of "light years" to "parsec", but it is normal human evolution, a little effort is enough, if we have had the patience to learn CW and measure the wavelength in meters, why not take a step forward?
I keep saying ... mysteries of the human mind !!!
Hello and end of speech, I do not want to convince anyone, they are only the complaints of a poor old man!
--?
73 de Loris?IW4AJR
On Fri, Jan 1, 2021 at 10:08 PM, Bob Lunsford wrote:
?
Loris, I can bend both ways. To people as here, that are taught the English system, it is easier and simpler for them to stay mainly with the English system because of tradition and seeing no need to learn a second system, even though it is based on the decimal system, easier to manipulate mathematically, etc., etc. You cannot convince me the metric system is more logical and common sense because I already know this. This cannot as easily be taught or accepted by those who are entrenched in a system that they have been taught since a child but with use, they can learn.
?
I like futbol and do not necessarily like American Football but here in America, this causes some of my friends to wonder about me. Watching the way Europeans and many other countries play futbol is a pleasure to me, although some women's teams do not cause this excitement nearly as much...
?
Bottom line, you don't have to convince me that the metric system is best on many fronts. Most in science and technology agree on this.
?
However:
?
"Everyone's taste is in his own mouth." {;->
?
Bob ¡ª KK5R
?
On Friday, January 1, 2021, 2:47:02 PM EST, Loris IW4AJR via <lorisbollina= [email protected]> wrote: ?
?
Hy Bob
The fact remains that in the world 6/7 billion people use the Decimal Metric System, that the ISO itself has established systems of multiples and submultiples related to the Decimal system ... I don't think that 400 or 500 million people, equal to only the 7% of the world population can continue to burden EXTRA COST over all the equipment, machinery and mechanics they import from the rest of the world with absurd costs for doubler the ingeniering for the rest of the world and maintain a measurement system that has been abandoned even by their own scientists ...
I know the inch metric comparison rules, but now, in the third millennium they are absurd and anachronistic !?it is time for the legacies of the past to be left in the past ... the future awaits us ! and the future does not belong exclusively to the USA, however big and important they may be, but to the whole world, from Europe to Asia and Africa and, not to forget, South America!
73 de
------- IW4AJR Loris
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Re: Ideas for "bulletproofing" the uBitx
The RDHFF1 does have some minor advantages over the IRF510 in the uBitx
Thermal resistance for the RD16HHF1 is 2.2 degrees C per Watt (vs 3.5 for the IRF510)
The RD16HHF1 tab is connected to the source, which can be grounded (the IRF510 has tab connected to the drain)
The RD16HHF1 is designed to operate around a 12v power supply (the IRF510 gives lowest IMD at 24v)
The RD16HHF1 might require somewhat less drive at radio frequencies (I'm not certain either way)
The RD16HHF1 datasheet actually states "VDD=15.2V,Po=16W(Pin Control) f=30MHz,Idq=0.5A,Zg=50? Load VSWR=20:1(All Phase) No destroy",
though Allison has found that her push-pull IRF510 50W amp running at 28v has survived open and shorted antenna connections.
None of those are major issues.
I think what most bugs some engineers is that the IRF510 datasheet does not describe operation as
a linear device at 30mhz.? It was intended for use at much lower frequencies, like automobile turn signals.
Getting it to work well at HF was a matter of experimentation.
If a part is designed into a product using characteristics not described adequately
in the datasheet, there is no recourse if parts start arriving that no longer work properly.
In the case of the IRF510, it's been working fine in amateur built amplifiers for 20 years.
I'm good with that.
Jerry, KE7ER
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Re: Contained Power supply
Sounds like you are looking for a wall-wart that has current enough, heavy enough wire size, and filtering enough for a uBITX.? That might be very difficult to find.??
Very few wall-warts do over 2 amps but you need 3 amps for a uBITX.? Most wall-warts do not have enough filtering for operation at near maximum current.
Arv _-_
I know I can use a bench supply, but does anyone have a good suggestion to one with the barrel already on it?
thanks!
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Re: Broke off screw mounts from screen
Loris, one parting comment here is that the person who is most convinced is he who can convince himself. Seems that people tend to believe and accept something easiest is the person who believes he "discovered" something that may have been shown him by someone else previously. Human nature.
Thanks for the interesting discussion.
Bob ¡ª KK5R
On Friday, January 1, 2021, 4:58:44 PM EST, Loris IW4AJR via groups.io <lorisbollina@...> wrote:
Bob,
Well, personal tastes can be applied to many parts of our life, but not to science and mathematics, the thing that amazes me most is that all of us as OMs talk about kilometers, meters, centimeters and millimeters when we think of "lengths of "wave", we quietly call them kilometer, decametric, metric, down to the millimeter, but some used stupid habits to justify feet and inches in mechanical measurements ...
Mysteries of the human mind ...
Yet just as radio amateurs we know that it is enough to study a little (and not so much) to adapt to the choices of science ...
I also struggled when in astronomy we went from the common use of "light years" to "parsec", but it is normal human evolution, a little effort is enough, if we have had the patience to learn CW and measure the wavelength in meters, why not take a step forward?
I keep saying ... mysteries of the human mind !!!
Hello and end of speech, I do not want to convince anyone, they are only the complaints of a poor old man!
--?
73 de Loris?IW4AJR
On Fri, Jan 1, 2021 at 10:08 PM, Bob Lunsford wrote:
?
Loris, I can bend both ways. To people as here, that are taught the English system, it is easier and simpler for them to stay mainly with the English system because of tradition and seeing no need to learn a second system, even though it is based on the decimal system, easier to manipulate mathematically, etc., etc. You cannot convince me the metric system is more logical and common sense because I already know this. This cannot as easily be taught or accepted by those who are entrenched in a system that they have been taught since a child but with use, they can learn.
?
I like futbol and do not necessarily like American Football but here in America, this causes some of my friends to wonder about me. Watching the way Europeans and many other countries play futbol is a pleasure to me, although some women's teams do not cause this excitement nearly as much...
?
Bottom line, you don't have to convince me that the metric system is best on many fronts. Most in science and technology agree on this.
?
However:
?
"Everyone's taste is in his own mouth." {;->
?
Bob ¡ª KK5R
?
On Friday, January 1, 2021, 2:47:02 PM EST, Loris IW4AJR via groups.io <lorisbollina@...> wrote:
?
?
Hy Bob
The fact remains that in the world 6/7 billion people use the Decimal Metric System, that the ISO itself has established systems of multiples and submultiples related to the Decimal system ... I don't think that 400 or 500 million people, equal to only the 7% of the world population can continue to burden EXTRA COST over all the equipment, machinery and mechanics they import from the rest of the world with absurd costs for doubler the ingeniering for the rest of the world and maintain a measurement system that has been abandoned even by their own scientists ...
I know the inch metric comparison rules, but now, in the third millennium they are absurd and anachronistic !?it is time for the legacies of the past to be left in the past ... the future awaits us ! and the future does not belong exclusively to the USA, however big and important they may be, but to the whole world, from Europe to Asia and Africa and, not to forget, South America!
73 de
------- IW4AJR Loris
|
Re: Broke off screw mounts from screen
Bob,
Well, personal tastes can be applied to many parts of our life, but not to science and mathematics, the thing that amazes me most is that all of us as OMs talk about kilometers, meters, centimeters and millimeters when we think of "lengths of "wave", we quietly call them kilometer, decametric, metric, down to the millimeter, but some used stupid habits to justify feet and inches in mechanical measurements ...
Mysteries of the human mind ...
Yet just as radio amateurs we know that it is enough to study a little (and not so much) to adapt to the choices of science ...
I also struggled when in astronomy we went from the common use of "light years" to "parsec", but it is normal human evolution, a little effort is enough, if we have had the patience to learn CW and measure the wavelength in meters, why not take a step forward?
I keep saying ... mysteries of the human mind !!!
Hello and end of speech, I do not want to convince anyone, they are only the complaints of a poor old man!
--?
73 de Loris?IW4AJR
On Fri, Jan 1, 2021 at 10:08 PM, Bob Lunsford wrote:
?
Loris, I can bend both ways. To people as here, that are taught the English system, it is easier and simpler for them to stay mainly with the English system because of tradition and seeing no need to learn a second system, even though it is based on the decimal system, easier to manipulate mathematically, etc., etc. You cannot convince me the metric system is more logical and common sense because I already know this. This cannot as easily be taught or accepted by those who are entrenched in a system that they have been taught since a child but with use, they can learn.
?
I like futbol and do not necessarily like American Football but here in America, this causes some of my friends to wonder about me. Watching the way Europeans and many other countries play futbol is a pleasure to me, although some women's teams do not cause this excitement nearly as much...
?
Bottom line, you don't have to convince me that the metric system is best on many fronts. Most in science and technology agree on this.
?
However:
?
"Everyone's taste is in his own mouth." {;->
?
Bob ¡ª KK5R
?
On Friday, January 1, 2021, 2:47:02 PM EST, Loris IW4AJR via groups.io <lorisbollina@...> wrote:
?
?
Hy Bob
The fact remains that in the world 6/7 billion people use the Decimal Metric System, that the ISO itself has established systems of multiples and submultiples related to the Decimal system ... I don't think that 400 or 500 million people, equal to only the 7% of the world population can continue to burden EXTRA COST over all the equipment, machinery and mechanics they import from the rest of the world with absurd costs for doubler the ingeniering for the rest of the world and maintain a measurement system that has been abandoned even by their own scientists ...
I know the inch metric comparison rules, but now, in the third millennium they are absurd and anachronistic !?it is time for the legacies of the past to be left in the past ... the future awaits us ! and the future does not belong exclusively to the USA, however big and important they may be, but to the whole world, from Europe to Asia and Africa and, not to forget, South America!
73 de
------- IW4AJR Loris
|
Re: Ideas for "bulletproofing" the uBitx
A friend of mine builds gaming computers. ?He told me to use a liquid cooling system if I really needed to take care of heat.
Thanks
Jim
KE0VVU
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On Fri, Jan 1, 2021 at 6:13 PM Howard Fidel < howard@...> wrote: I have 19V and on 40 meters, about 20 watts. Much less on the higher bands. The IRF510 is a poor choice for higher power and higher frequencies, it is slew rate limited.
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Re: Ideas for "bulletproofing" the uBitx
Since this group is providing support for broken uBITX rigs, it is normal that what? is posted here includes a high number of references to broken equipment.? There are? thousands of BITX design rigs being used without any problems, but you don't see? many posts about working rigs.??
Arv _._
Mad,
Thousands of stock uBit's are operating with no trouble at all.
If the IRF510's die at all, It is almost certainly because of overheating.
Perhaps when running some digital mode, inside an enclosure, with zero airflow..
Many of the reports of blown IRF510's can be attributed to people fiddling with the gate bias pots
without first spending 10 minutes to figure out what they are doing.?
The "clockwise is minimum" pot rotation plays a big factor.
Going to RD16HHF1's will only make this mistake much more expensive.
The uBitx is designed to be a minimalist SSB rig for all of HF at minimum cost, and succeeds wildly.
If it is to be used continuously at full power in digital modes, the minimalist heatsinks should be improved.
I can imagine that a shorted antenna jack (thus infinite SWR) could play a role.
But only because the IRF510's might heat up after some period of time.
Many in the forum run the IRF510's at around 20 volts for increased power.
With an adequate heatsink, this works reliably.
If you insist on telling them they should switch over to "real" RF devices such as the RD16HHF1,
you should also warn them?not to run at much beyond 12 volts.
The qrp-labs 10W PA blows away the many claims over the years in this forum
that the IRF510's are not suitable as RF transistors.?
It simply works, flat and clean, from 3.5 to 30mhz.
And is bulletproof when operated at 12v, even when presented with a worst case SWR.
The uBitx IRF510's can be just as reliable if given a suitable heatsink.
Jerry, KE7ER
On Fri, Jan 1, 2021 at 01:31 AM, MadRadioModder wrote:
Don¡¯t understand the point.? Why would you want to operate excellent RF transistors designed specifically for the 12-14V mobile world at a higher voltage?? They make all of their power in that range.
?
You are correct¡ that most people won¡¯t get much out of replacing IRF devices with the RDs¡? until they blow out a set or two of them.? Then it will start to matter, because the RD devices survive much better under bad circumstances like infinite SWR.? Again, real RF transistors designed for load mismatch tolerance ?(read the app note, load tolerance spec).? Bullet-proof.
?
You are also correct that most people won¡¯t spend the time to replace the IRF devices for the RD devices even after they kill a few sets.? They will just keep killing IRF510¡¯s.
?
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I have some stock of darlingtons and wonder if there are any such transistors that can sub for the FETs because of the higher gain? Will the 3904s be able to drive a darlington with its much higher gain or would it require some kind of matching system? I believe using FETs eliminate much of the matching and drive attention but some here may know the answer to this better than I can guess.
Bob ¡ª KK5R
On Friday, January 1, 2021, 12:58:37 PM EST, Jerry Gaffke via groups.io <jgaffke@...> wrote:
Here's an excellent post from Allison regarding the use of IRF510's vs the RD16HHF: ? ?? /g/BITX20/message/53765The IRF510's can work fine up through 30mhz. At 50mhz I'd go with something better, but Allison finds a way. Power from the 16db 2n3904 based driver stages falls off as the frequency goes up. That may well be more of a factor than the IRF510's in your "much less on the higher bands". Jerry, KE7ER
On Fri, Jan 1, 2021 at 09:13 AM, Howard Fidel wrote:
I have 19V and on 40 meters, about 20 watts. Much less on the higher bands. The IRF510 is a poor choice for higher power and higher frequencies, it is slew rate limited.
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Re: Broke off screw mounts from screen
Sorry, I do not fully comprehend the nut "snapping off." I can see a screw snapping off but not the nut. Can you give more details?
Bob ¡ª KK5R
On Friday, January 1, 2021, 3:53:18 PM EST, Gregg <greggahorton@...> wrote:
That's helpful for finding the right screw, but any idea how to fix the nuts that have snapped off?
Remember that the measurement is from the max mating surface (tip) to contact surface or the overall length. Therefore, with flathead screws, it is not the length of thread, it is from the end of the screw to the flat/surface (top) of the screw. This is obvious by process of elimination.
Bob ¡ª KK5R
That makes sense, I should have gotten out my calipers
If you measure the screws' length with a millimeter scale, you will find there are two sizes, a longer one and a slightly shorter one. Use the shorter one and it will work OK. Just because a screw happens to screw into the thread does not mean it is the right screw.
The parts list that comes with the radio shows this, there are two screw sizes but of two different length. Time to break out that millimeter scale.
Bob ¡ª KK5R
I was attaching the screen and the screws weren't sitting flush and the bottom two nuts snapped off as I tightened. Is there anyway to repair? The screen isn't loose but I'd rather those not be snapped.
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Re: Ideas for "bulletproofing" the uBitx
The V6 shines best on CW but I have been heard here in E Kentucky by others over the state and in Tennessee. Sure they have to crank up their RF gain to hear me but this is because too many hams use the RF gain as an HF equivalent to a 2M squelch control to limit static, etc.
CW is famous for requiring a couple of watts where at least 20W would be needed with SSB. Remember the Heath HW-8 with only about 2-3W and still high on some people's want list...
Bob ¡ª KK5R
On Friday, January 1, 2021, 3:32:25 PM EST, R. Tyson via groups.io <tysons2@...> wrote:
>The qrp-labs 10W PA blows away the many claims over the years in this forum
>that the IRF510's are not suitable as RF transistors.?
>It simply works, flat and clean, from 3.5 to 30mhz.
I can also vouch for the QRP-Labs 50 watt amp. Using a pair of IRF510's in push pull and a good heat sink it just......???? works. Using CW it barely gets warm even after a lengthy over on my part.? Give the IRF510's a decent heat sink, don't require them to try and do the impossible and they are very good. They are also very cheap but if you need replacements make sure they are genuine products. Why oh why do people buy radio kit and then try to screw the ultimate, or even a bit more, out of it ? For those who don't know, or realise, if you are running 5 watts and receiving an S5 report then you would have to increase the power fourfold to gain another S point on your report. After raising it fourfold again you would gain another S point. You have to throw increasing amounts of power into gaining just one S point on your signal report.. it is more effective to improve the antenna system.
e.g.
5 watts = S5
20 watts = S6
80 watts = S7
160 watts = S8
640 watts S9
Reg??????????????????????? G4NFR
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Gerard
Loris Bollina
Skip Davis
Bob Lunsford