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- BITX20
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Re: Ubitx version 4.3
Many thanks for that Jerry! Live and learn, yes solely cw, so filters will be the way to go. SSB for me would be a bonus that I probably wouldn't use ! The main source of irritation for me is the very low rx volume and of course keying. I wasn't aware that the firmware was available for the version 4 ubitx so will try and work out how to use that, very hard for an old dog to learn new tricks (hi) many thanks for the heads up, it's really appreciated. 73 to you.... Paul M6FEU
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Re: Question about Nextion display and firmware
hirosmb
¿ªÔÆÌåÓýGuys,Sorry if I ask a silly question. Do I have to switch Arduino nano to mega2560 if I use the Nextion display? If it¡¯s not the case, what is your incentive to switch them?, I¡¯m just curious. Thanx, // hiro, JJ1FXF?
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Re: Mike element
The receiver spec's how big of a signal goes in to give a desired result.
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The microphone spec's how big of a signal goes out given a specific input sound level. So the first gets a smaller number if more sensitive, the second increases if it's more sensitive. Totally different industries, totally different notions of how to go about it. A receiver's sensitivity figure in dBm tells us how much power must be coming in the antenna port to achieve a specific result, in this case the "minimum discernible signal". A power level zero dBm is arbitrarily defined as 1 milliwatt, and since typical signals at the receiver are much lower in power, the receiver sensitivity is a fairly large negative number. The microphone's sensitivity is defined as how big of a voltage signal we get coming out when the microphone is presented with a sound pressure of one Pascal, and zero dBV is arbitrarily defined as one Volt.?? Most of the speakers I buy state something like: "Response from 20 Hz to 20 kHz". Not very precise. They don't actually say what the response is, could be argued that catching fire is a response of some sort. Here's a webpage on speaker sensitivity: ? ?? "Sensitivity Sensitivity is most easily defined as the speakers¡¯ ability to effectively convert power into sound. The traditional way of measuring a speakers¡¯ sensitivity is using the standard of 1 watt/1 meter. Meaning a microphone is placed 1 meter away from the speaker to measure the sound output (in decibels) with 1 watt of sound played through it.?" So like the microphone, they spec how big of a signal goes out (sound in dB) when given a specific input (1 watt of electrical power). Makes sense, as would have been the same engineers working with microphones and speakers back when these things were defined. Next question:? What is 0 dB of sound, and shouldn't that dB have a letter following it to tell us what the baseline is when finding that ratio? Answer:? Zero dB of sound?is defined as the minimum discernible signal for the typical human ear. No final letter because, well, it's a different group of engineers who defined it and they didn't care about the resulting confusion. Jerry? On Mon, Jul 16, 2018 at 11:50 PM, iz oos wrote:
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Re: Nextion display cutout and mounting.
#ubitx
#ubitx-help
Stephanus K6NG
Awesome bezels from this site,
Very professional looking.? Stephanus |
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Re: New file uploaded to [email protected]
Michel, thanks for sharing this.? I will check this out and make changes.
Have you seen any other problems that should be addressed. Thanks again for sharing this issue. kn4ud -- Allen ?Merrell |
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Re: ADE-1-24
Theoretically the mixer (transformers, diodes) should be balanced and whether you ground pin 2 or pin 5 makes no difference, especially within the specified working range (0.5-500MHz). However, realistically you might get different LO leakage on the RF and IF ports, but that is over -50dBc on both ports at HF so not really something to worry about. Look at the Isolation L-R and Isolation L-I in the ADE1 datasheet, the values are slightly different:
Cheers, Razvan. |
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Re: uBitx Version 3 and my homebrewed enclosure complete - Well Almost!!
#ubitx
Hello all ? ? ? ? ? ? ? ? ? ? ? ?Fine job Juddie, congratulations! 73 Saulo PY7EG 2018-07-15 14:40 GMT-03:00 WD8WV <juddie.d.burgess@...>: Well, when I first posted about my uBitx being done, I made a mistake and in the title I typed QCX!? DUH!!!? Well, here I am again with my completed uBitx (not QCX).? I only have a few mods left to do, but right now I am having all kinds of issues trying to get the KD8CEC S-Meter modification done using the LM358 chip.? But I have that mod left to do, the TX/RX pop mod and the AGC mod by ND6T (I think that is right) to do.? I have already did the mod and added an RF gain control with a 1K potentiometer.? I created my own bezel for the front of my homebrewed enclosure. I also added a USB male to female adapter so I don't have to remove the cover to update the firmware.? Still need to get the SD card ribbon cable extender to plug into the Nextion display so I won't have to remove the display to update the tft files on the display. |
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Re: Question about Nextion display and firmware
¿ªÔÆÌåÓýHello Mike and Bo, ? Thank¡¯s for your responds, I agree with Mike, I need the sketch sources, for some modifications. eg: pins assignations, specifics functions for myself and other choices. I can redevelop a new firmware, but the CEC firmware is very pleasant and I appreciate this very well. Jan have make a fantastic job and why to reinvent the wheel ? 73¡¯s de Jacques ¨C F1APY ? From: [email protected] [mailto:[email protected]] On Behalf Of Mike Woods
Sent: Tuesday, July 17, 2018 10:05 AM To: [email protected] Subject: Re: [BITX20] Question about Nextion display and firmware ? Then it will definitely need some changes to the sketch!?? The i2c pins are different for a start.? I'm not sure what else would need modifying.
? -- |
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Re: Question about Nextion display and firmware
¿ªÔÆÌåÓýThen it will definitely need some
changes to the sketch!?? The i2c pins are different for a start.?
I'm not sure what else would need modifying.
Mike On 17/07/18 4:58 AM, Bo Barry wrote: Mike, I think he wanted a hex file compiled on a mega2560 not nano.
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Re: 3.2in Nextion display now looks great.
Malcolm
Thank you Allen, I was able to remove a number of switches from my original case after changing over to the Nextion screen. I also changed some colors using the Nextion editor, just for my preference! Apologies for the incorrect spelling of your surname in my original post. I have attached a picture of my original ubitx to show the improvement.?
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Re: Mike element
Thanks Jerry, I had always thought the opposite, the lower the more sensitive just like sensitivity in a receiver. So, I was wrong. What about sensitivity in headphones and speakers? Il 17/lug/2018 04:29, "Gordon Gibby" <ggibby@...> ha scritto:
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Re: Windows Serial Port Problem
¿ªÔÆÌåÓýBut they are not counterfeit as the hardware and software is open source. ? ? From: [email protected] <[email protected]> On Behalf Of Jon Titus, KZ1G ? Counterfeit boards bear marks that make them look like Arduino.cc-produced boards.? (Much like counterfeit watches marked as "Rolex.")? People can get tricked into buying boards with a USB, or other chip, that makes them compatible only after they download special drivers, etc.? If a company produces an Arduino clone they should mark it as such.? They also should note that a given board is compatible with an Arduino XXX, but is a product not of Arduino.cc but of another company.? Be careful what you buy and read the specifications carefully.? Just my opinion from experiences with Arduino boards. |
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Re: HDMI display
I agree that taking advantage of the CAT interface and using a second computer, that is HDMI capable, is probably the most practical approach.?
However: One big advantage of the Arduino computers is they make writing programs interacting I/O pins possible in an easy and understandable way.? I stumbled upon this library that brings the same type of I/O programming simplicity to the Raspberry Pi.? Assuming a Raspberry Pi Zero (which has an HDMI output) is not too big of an RF noise factory, one could replace the Nano with the Pi Zero. For hacking something like this together, rather than remove the Nano from the?Raduino board, you could reprogram the?Raduino to be an I2C to LCD display adaptor and drive the LCD display (assuming you may like to have an LCD display in addition to an HDMI display) and the?Si5351 chip from the Rpi over the I2C bus. Then connect I/O pins from the Rpi, as needed, to the back of the?Raduino to let the Rpi directly take over the I/O functionally that was handled by the Nano when it was running the uBITX firmware. Tom, wb6b |
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Re: New file uploaded to [email protected]
¿ªÔÆÌåÓý
//Draw Smeter ? if(pm.cp.val!=-1) ? { ??? jSMeter.val=pm.cp.val*12 ?<¡ª¡ª 10 ??? pm.cp.val=-1
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Re: Finding variables in source code
Jack Purdum
It depends. I use i, j, and index quite often in my code and find nothing wrong with it because those variables are almost always used for the same purpose and are rarely the source of program bugs. Everyone has their own coding style...unless you work as a programmer where style is dictated. Personally, I never use an underscore in a variable name for two reasons: 1) double-underscores were typically used as system variables and I still think that when I see them (it's a personal problem), and 2) while I can probably type 70wpm, the underscore key slows me down because I rarely use it. Some coding conventions I've found useful: ??? 1. Start variable names with a lowercase letter, and only cap the first letter of sub-words: keyboardInput, xmitSwitchState, ptrSisters. ??? 2. Start function names with an uppercase letter. That way you can tell in a glance whether it's a variable or a function. That's especially useful when you use pointer to ????????functions. ??? 3. Variables are like nouns in a sentence. Typically they reflect something of interest in the program and the name should convey that. ??? 4. Make the name long enough to convey that interest, but short enough you don't find it burdensome to type it over and over. ??? 5. Function are like verbs in a sentence. Typically they reflect an action taken and the function name should reflect the action, but not the means of the action. That is, ????????SortList() is a better name than BubbleSortList() because the former says what's to be done, while the latter says what's to be done and here's how I'm going to do it. ??????? a. Functions are black boxes with no windows. It's nobody else's business what goes on inside. What happens in functions stays in functions. Do you really want to force ????????????users to recode their programs because you stopped using a Bubble Sort and switched to a Shell Sort? Hint: NO. ??? 6. Make functions cohesive. It you cannot say what a function does in two sentences, it's probably trying to do too many things. Break it into two smaller, and probably more ????????reusable, functions. Beginning students too often try to write Swiss Army Knife functions; they do a lot, but nothing well. Rarely is a function with a long parameter list a ????????cohesive function. Passing in flag variables is a dead giveaway that you're trying to make the function do too many things. ??? 7. Learn how to read and use complex data definitions. For example, what does this definition define: ????????????????double (*(*pf)())[3][4]; ??????? It's easier than you think to figure this out using the Right-Left Rule. (See:) Because C allows you to "create" new data types, it's an extremely robust and power language. Writing C code is a personal thing and everyone is free to write it anyway they want as long as the compiler can parse it. However, when you know someone else has to read it, clarity starts to gain importance and style plays a part, too. Jack, W8TEE
On Monday, July 16, 2018, 11:13:12 PM EDT, Jon Titus, KZ1G <tituskz1g@...> wrote:
The problem with how to locate variables also involves how programmers label them.? Too many books, teachers, and hobbyists use nonsense variables such as i, j, index, ptr, and so on as variable names.? Use variable names that indicate how you use them--Keyboard_Input, XMIT_Switch_State--and you save yourself and others endless searches and wasted time. -- Jon Titus, KZ1G Herriman, UT USA |
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Re: Windows Serial Port Problem
Jon Titus, KZ1G
Counterfeit boards bear marks that make them look like Arduino.cc-produced boards.? (Much like counterfeit watches marked as "Rolex.")? People can get tricked into buying boards with a USB, or other chip, that makes them compatible only after they download special drivers, etc.? If a company produces an Arduino clone they should mark it as such.? They also should note that a given board is compatible with an Arduino XXX, but is a product not of Arduino.cc but of another company.? Be careful what you buy and read the specifications carefully.? Just my opinion from experiences with Arduino boards.
-- Jon Titus, KZ1G Herriman, UT USA |
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