Bitx40 PC Board Image Please
#bitx40
After some years of lying fallow, I have found my round tuitt to assemble Farhan's bitx40.? I need to make Allard's recommended mods.? It would greatly help me if some kind person could email me images of the top and bottom of the PC board.? Many thanks in anticipation.
Kevin VK3DAP / ZL2DAP
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Re: uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
Thanks, Gordon. I'm building from scratch so I didn't have a board to look at, and I wasn't smart enough to look at a picture or the layout file.
73,? Todd K7TFC
Yes, they are in parallel. I was confused the first time I saw that with an earlier schematic years ago and checked it out. ?(look at the actual board)¡¯
?Questa risposta non ha senso -- ?
73
Mick VA3EPM?
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Re: uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
I've seen that on other schematics. Where there are more than one with the same arrangement of accompanying resisters, etc., the line is dashed and the notation "Q1, ... Qn" is written above the line to designate the transistors in the string.. It's done to conserve space on the paper and to avoid unnecessary confusion.
Want to talk about confusion with schematics? I worked for a machine tool company in New York for a year and one engineer owned his own machine tool company in the Philippines previously and he designed an automatic system for cutting rods into threaded shafts with all kinds of beveled areas, reliefs and retaining slots. The drawing for the machine was 40-ft long... The machine cut a shaft automatically in less than half an hour that took four times that when done by a human and with much more precision. Such machines are fascinating to watch, much like the first time you see a plotter drawing up a written document with fancy fonts, etc.
I know a draftsman/designer (WB4RVN) who can draw script that looks like it was done by a machine. I'm sure there are others equally talented. These people are artists in their own right. Calligraphy is indeed an art.
Bob ¡ª KK5R
On Saturday, November 21, 2020, 9:31:00 PM EST, Gordon Gibby <docvacuumtubes@...> wrote:
Yes, they are in parallel. I was confused the first time I saw that with an earlier schematic years ago and checked it out. ?(look at the actual board)¡¯
On Nov 21, 2020, at 20:21, Mick <Mgsebele@...> wrote:
?Questa risposta non ha senso -- ?
73
Mick VA3EPM?
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Re: uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
Yes, they are in parallel. I was confused the first time I saw that with an earlier schematic years ago and checked it out. ?(look at the actual board)¡¯
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On Nov 21, 2020, at 20:21, Mick <Mgsebele@...> wrote:
?Questa risposta non ha senso -- ?
73
Mick VA3EPM?
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Re: Email still coming in no email button selected
I have found that some browsers when you hit the Save button and it does not work, hold down the Shift button when you click Save and the system accepts it. Worth a try.
Bob ¡ª KK5R
On Saturday, November 21, 2020, 8:55:15 PM EST, jaytee1@... <jaytee1@...> wrote:
Dave,
Thanks all suggestions are great. That was already tried and Admin gave it a try, but its a weird anomaly. As suggested I left the group and re-joined but the issue continues.
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Re: Email still coming in no email button selected
Dave,
Thanks all suggestions are great. That was already tried and Admin gave it a try, but its a weird anomaly. As suggested I left the group and re-joined but the issue continues.
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Re: Email still coming in no email button selected
I haven't followed your thread so please excuse if my suggestion has been offered.
After you check the no subscribe button scroll down the page, and hit the save button. I don't know if this is necessary but may be worth a try.
Dave, AA6RE
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Re: uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
Questa risposta non ha senso -- ?
73
Mick VA3EPM?
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Email still coming in no email button selected
Arv,
I un-subscribed and re-subscribed as suggested and the problem is still ongoing. Almost Immeadiately started receiving emails.
Another other suggestions???
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Re: uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
Loris--I guess something was lost in the translation from English to Italian and back to English, but I take it you can't answer my question. My non-robotic 'imagination' already suggested the shorthand idea, and now I'm looking for confirmation. Ciao!
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Re: uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
Hey Todd !!!
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making the shoes to the flea on the schemes does not seem to me a constructive way to experiment !!!
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I think the fantasy is dead !!! ... I have read many posts in this forum and I have come to the conclusion that humanity is shrinking more and more to simple and robotic stacks ... if something is not standardized it is out of the understanding of the robotic minds of the new computer humanity! !! !
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Use a little imagination, if something is not "strictly" codified, USE IMAGINATION !!!! fly over the nonsense and get to the point !!!! you may discover the immense pleasure of using the brain !!!!
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wishes of "beep .. beep" !!! 73 de IW4AJR Loris
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uBitX v.6 schematic / driver and finals transistor symbols /
#ubitxv6
#v6
Folks, On Farhan's schematic for v.6, the pre-drivers, drivers, and finals transistors are drawn in a way I've never seen before. There's solid lines from the base of one transistor through the circle body of the transistor to the base of the next transistor. Examples include Q911 & Q912, Q92 & Q93, etc.  Is this a shorthand way of drawing parallel transistors (i.e., the bases are connected together)? Thanks! Todd K7TFC
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Re: SWR meter with second arduino
Hello Dennis,
Thank you for your information
So far I don¡¯t have a second Nextion. (In 2021?)
So my edit would be a main 5-inch Nextion and a 3.2-inch Nextion in secondary. So it should work.
Afterwards, I was wondering if it was possible to add an audio equalizer that we could drive with this 2nd screen. There are circuits controllable by the arduino.
with a?MSGEQ7.
see here:
cdt
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Before uBitx GDP was a good proxy for happiness.
Hello Raj
It doesn't matter which bands he wants to experiment on, even in SHF they never experimented on 3.4 GHz ... but now we're losing the band all over the world! ... private interests go in the diametrically opposite direction to "man's individual happiness" as Kennedy said "gross domestic product can measure anything but not human happiness"!
that is why I would be curious to know what "experiments" our "friend" is conducting!
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73 de IW4AJR Loris
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Re: SWR meter with second arduino
You might be interested in my project.? ?I have created a major revision to Dr. Lee's standalone I2C with a bunch of enhancements, including a way to calibrate the power/swr meter.? Included is my tweaked Nextion firmware for 3.2" display that includes the power/swr meter integration.? It is at:
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Dennis WC8C
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Are you using the second Arduino for the SMeter?? If so, then the speed is based on how the code is written and the communication mechanism with the Nextion.? I have replacement firmware for the second Arduino that makes the SMeter much faster (but if you turn on the FFT function is gets slow again).? My project can be found at?
If you have not already used the second Arduino, I highly recommend you first get things working with Dr. Lee's original code, using his documentation before trying my new version.?
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Dennis WC8C
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Dennis, the uBitx version is the 5, 3.5 inch Nextion, Firmware 1.20 from KD8CEC.
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Best regards
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Hello Raj
It doesn't matter which bands he wants to experiment on, even in SHF they never experimented on 3.4 GHz ... but now we're losing the band all over the world! ... private interests go in the diametrically opposite direction to "man's individual happiness" as Kennedy said "gross domestic product can measure anything but not human happiness"!
that is why I would be curious to know what "experiments" our "friend" is conducting!
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73 de IW4AJR Loris
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Loris,
He has stated that they are not in ham bands earlier.
Raj
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At 21/11/2020, you wrote: Hello Rafael,
what kind of "experimental license" do you have?
to work in the frequency bands assigned to the "Radio Amateur Service" (see the ITU assignments) it is "ESSENTIAL" to have a Radio Amateur license and, due to agreements made by IARU with almost all the National Institutions for Communications (see for example here in Italy with the Ministry of Infrastructure), the compliance with the subdivision by type of use (CW, SSB, Digital, etc.) and the respective maximum bandwidth allowed is a legal obligation!
I fervently hope that your experiments are not oriented to occupy the HF with telephone or other "private" digital communication networks, private communications are already "eating" us the UHF and the SHF to allow the allocation of digital networks of nature certainly not experimental.
I do not think that radio amateurs around the world ask for the impossible, but only to be left in peace to enjoy their QSO and their experiments, without being "victims" of commercial purposes that certainly do not care about " human right to happiness "!
Tell us what experiments you want to do!
Greetings IW4AJR Loris "HONOR ROLE" ARI (Italian Radio Association).
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Re: Question: Why do you call "AGC" a simple automatic antenna "attenuator" in this forum?
#ubitx
#ubitxv6
Hello Bob,
For the use of old radios, I almost agree with you, but 40 or 50 years ago there were already on the market beautiful and indestructible specialized radios for HAM, such as Collins, Drake, Kemwood, Yaesu etc., the passion for the "repair" and "modification" of the radios present in the radio amateurs' Shacks did not arise from the need to maintain the equipment in efficiency, but from the pleasure of "experimenting" new things and learning the techniques and theory of communication (see ITU assignment of Amateur Radio Service) ...
Unfortunately this has been lost over time ... but not for the fault or defect of young radio amateurs, but for purely "commercial" reasons, the construction of the SMD equipment has made it practically impossible for most to modify the circuits, the excessive " digitization "of products has led Radiomators to be not experimenters of communications but software geeks ...
It's a shame, but the habit of throwing away will inevitably lead to the death of the Amateur Radio Service! ... even KITs like the ?BITX have suffered the same fate ... too many costs to assemble a board with discrete components and the "all do it yourself" KITs like the Russian ones are not suitable for "novices" or for those who they have to learn electronics before they make them ... I see a sad future for "us" ... I just hope to have passed away before the last frequency bands are removed from Ham use!
I would really like to know who cares more about "the right of men to happiness" ... bha ... you will probably have to amend yours constitution, so I'm afraid it is already obsolete! ... Such a pity !
Hello and cordial greetings from IW4AJR Loris
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Bob Lunsford
Mick
Gerard
Raj vu2zap