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Re: New Nextion display V5 signal or stand alone analyzer CEC 1.122
Mike Short
My pet peeves, cases and spaces... On Mon, Mar 18, 2019 at 7:49 PM Laurence Oberman <oberman.l@...> wrote: Note for others not as expereonced with the compile stuff. |
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Re: New Nextion display V5 signal or stand alone analyzer CEC 1.122
Laurence Oberman
Note for others not as expereonced with the compile stuff.
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If you code on Windows it wont care about case. Linux Does, so use Case carefully on Windows, f the file has uppercase use it in your code then it will be portable to Linux too. i.e. if the include file is Arduino.h Windows will find it, even if you have #include <arduino.h> Linux would need to rename the filename to #include <Arduino.h> On Mon, Mar 18, 2019 at 8:46 PM Laurence Oberman <oberman.l@...> wrote:
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Re: New Nextion display V5 signal or stand alone analyzer CEC 1.122
Laurence Oberman
Linux is case sensitive
arduino.h needs to become Arduino.h, likely that is your issue. I modified them and built it for you. On Mon, Mar 18, 2019 at 8:37 PM Mike via Groups.Io <mikeymustang2000@...> wrote:
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Quick review of the Kit-Projects AGC board
#ubitx
I bought two of these for my 2 uBITX Version 5 radios. ?First off, the directions for installing this board are brief but they are easily followed and the boards are easy to install.
Not wanting to drill a hole for the included switch and run a bunch of wires to it, I just wired the common pad to the "fast" pad for always on, Fast AGC. ?I found a "Via" hole in the trace between R70 and "Vol HI" and ran a wire from there to the "VOL" pad on the AGC board which worked great. Even though the "S-meter" output of this AGC system was designed to work with the CEC software, we found it worked with TSW's BITeensio board as well. ?We use the A19 analog input on the Teensy 3.6 for the S-meter and this little AGC system drives our S-meter routines just fine. ?I fed a 50 microvolt (-73 dBm) signal into the antenna connector and adjusted the software's S-meter routine's division ratio so the touch screen's display read S9 as it should. ?The rest of the S units were so close to correct no further tweaking was deemed necessary. I also found that adjusting the on board RF gain control for max recieved signal was the best way to do it. ?As you turn the control counter clockwise, the gain increases and there is a point past which saturation occurs. ?This is obvious when listening to a weak signal and you can hear the gain drop past this point. ?Adjust it to that point and turn it back to where the signal just peaks. ?Best to just leave it there if you want your S-meter to work right. ?Once adjusted, this little AGC board keeps the RF input nicely within bounds on strong signals quite well. ND6T, N8DAH, well done guys, well done! ?The kit is certainly worth the price IMO. Jim Sheldon, W0EB TSW Project Coordinator |
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Re: New V5 with poor carrier suppression.
I got carried away a bit.
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Point was that measuring voltage across a diode to determine power consumed is just not going to work.?? A 700mv pk-pk sine wave into 50 ohms is indeed around 1dBm though. Jerry On Mon, Mar 18, 2019 at 05:00 PM, jim wrote:
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Re: No output
¿ªÔÆÌåÓýSam did you turn VR2 & 3 CCW to zero, if you did that is incorrect and you will pop your finals on power-up. You needed to start at full Clockwise on both controls, that is the zero volt starting point for final bias.Skip Davis, NC9O? On Mar 18, 2019, at 07:32, Sam Tedesco <stedesco619@...> wrote:
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Re: New V5 with poor carrier suppression.
jim
Meh? ....\Looked it up on a DB table ...Close enough ...Since NOTHING i have on my bench is in any calibrated/standardized to any known NIST measurement ...My best guess "does that sound about right?" is close enough for my bench/ubitx/puttering Not making no NASA stuff here, nor selling it either Jim
On Monday, March 18, 2019, 10:37:54 AM PDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
I have no idea how you get +1dBm. A 700mv pk-pk square wave centered on ground is 350mV rms (since it's square not sine) Into 50 ohms, that would be 0.350*0.350/50 = 2.5mW,? so? 10*log10(2.5mW/1mW) = 4dBm. But the CLK0 LO is driving a 1:2 transformer which then drives two series Schottky diodes, definitely not a 50 ohm resistor. ? I believe standard practice is to evaluate dBm for the LO into 50 ohms resistance. A? mixer designed for that dBm level should then be able to make good use of the LO. With two Schottky diodes in series and with this transformer arrangement, we should get best performance (maximum signal handling capacity) at 7dBm of LO power,? Signal level going in (from the mike amp) should be at least ~10dB less than the LO, or distortion occurs. The si5351 has 3.3v CMOS output drivers capable of driving up to 8ma, so even without the attenuation of R110,111,112,113, it's not capable of giving 7dBm into 50 ohms. While not ideal, it's adequate for a $130 HF rig. More LO power (especially at the first mixer) would allow the receiver to work with stronger? out-of-band signals present, which hasn't been a hot button issue for the uBitx. It would also allow larger signals through the IF stages when transmitting, but that could also be addressed by adding an amplifier stage to the PA. Jerry, KE7ER On Mon, Mar 18, 2019 at 09:48 AM, jim wrote:
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Re: Interesting article contrasting different ways to design an antenna analyzer
Took pot luck back in the early 80's?
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once I realized my then advanced class license qualified me for a shorter call.? Had been WA7WDK (prior to that, WN7WDK). That final "K" always bugged me when sending CW, would have been happy to take most anything else they might have. Jerry, KEYER . On Mon, Mar 18, 2019 at 03:24 PM, Laurence Oberman wrote:
Jerry |
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Re: 680nH in the states?
Mark - N7EKU
Hmm,
The ebay seller may say they are, but the Epcos datasheet doesn't say that.? It states that it is wire wound on a ceramic core.? The only shielded one I saw in the series was the ones for power supplies made with a cup core. Anyway, I wonder if shielding has much to do with any improvement.? More likely due to the small size, installed orientation, or low Q factor.? It could easily be checked by cutting one apart though.? How many confirmed measurements on different boards (before and after with no other changes using an SA) have been shown for this change?? 73, Mark. |
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Re: Interesting article contrasting different ways to design an antenna analyzer
Laurence Oberman
Jerry
Whenever I see your Call Sign my Eyes read it as Keyer :) Even though its KE7ER Nice call sign to have for sure. On Mon, Mar 18, 2019 at 5:38 PM Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
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Re: Interesting article contrasting different ways to design an antenna analyzer
Here's a couple designs sort of like what Jim describes.
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Though I would not call them superhetrodyne. This one is described in sufficient detail that you might be able to build something similar: ? ?? It sends a signal into the unit under test, and then analyzes the voltage and current using two mixers. The local oscillator for the mixers is always 1khz away from the signal into the unit under test. K5BCQ offers a "Vector Impedance Analyzer" kit that operates on the same principle. you'll find it at the bottom of this webpage:? ? K5BCQ has been active in this forum. The W5BIG design uses DDS chips to create sine waves 1khz apart, one for the unit under test and one for the LO. The K5BCQ kit uses an si5351 to create square waves 3khz apart, we don't care about the harmonics since the beat note between harmonics is greater than 3khz, and easily filtered out by DSP firmware.? Jerry, KE7ER On Mon, Mar 18, 2019 at 12:57 PM, Tom, wb6b wrote: A while ago I was trying to understand how one of the superheterodyne antenna analyzers worked without some kind of phase detector working at RF frequencies and was finally able to find a description that it involved modulating the RF signal source with a couple of audio tones, if I recall correctly, and measuring the phase of the demodulated tones. Very clever those analog folks.? |
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Re: Interesting article contrasting different ways to design an antenna analyzer
That's interesting. I hope someone who if familiar with these knows and could shed some light.
A while ago I was trying to understand how one of the superheterodyne antenna analyzers worked without some kind of phase detector working at RF frequencies and was finally able to find a description that it involved modulating the RF signal source with a couple of audio tones, if I recall correctly, and measuring the phase of the demodulated tones. Very clever those analog folks.? Tom, wb6b |
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Re: Nano to Uno
#bitx40
Jack Agreed.? I just ordered 5 of these from an Ebay dealer at US$1.98 each.? Several projects in mind where I need just a bit more speed and memory than the 16 MHz Arduino provides.? Arv _._ On Mon, Mar 18, 2019 at 11:59 AM Jack Purdum via Groups.Io <jjpurdum=[email protected]> wrote:
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Re: Nano to Uno
#bitx40
Jack Purdum
In the Arduino IDE, compiling for different boards is little more than selecting the desired board and selecting the compile icon. I've had everything from a single 1x20 display to a 480x320 color TFT touch screen display running on various Arduinos. I don't do much with the Uno any more because of its relatively large size. It's still used a lot, however, because there are lots of "shields" from thumbprint readers to GPS modules that plug directly into it. There are lots of options that use the Arduino IDE (Arduino's, Teensy's, STM32F's, etc.) and the "correct" one depends upon what you're trying to do. Jack, W8TEE
On Monday, March 18, 2019, 12:10:19 PM EDT, Mike Short <ai4ns.mike.spam@...> wrote:
Showing my ignorance here. What would be involved with compiling the nano over to the UNO? it would expose more pins, etc. ?and the possibility of a different display.? Mike AI4NS |
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Re: Nano to Uno
#bitx40
Jack Purdum
Al (AC8GY) has a really nice signal generator he's designed with a nice color display and touch screen interface. We're moving it from the Mega 2560 to the STM32F103 for the book. More later... Jack, W8TEE
On Monday, March 18, 2019, 12:51:28 PM EDT, Laurence Oberman <oberman.l@...> wrote:
This is the HF signal GEN I built after reading Jack's book. There is a little white board with the atmega328p, the dds chip is separate and front panel. The board I have exposes all the pins. Was very cheap, comes in a kit and could be used instead of the nano On Mon, Mar 18, 2019 at 12:42 PM Laurence Oberman via Groups.Io <oberman.l=[email protected]> wrote: > > Hello, same atmega328p but yes extra pins, would need to make sure you > change the code for pin numbering and the daughter card would have to > be modified, i.e. remove the nano and create an interface cable for > the mapping of current pins, then the additional pins can come from > the Uno direct to the extra screens etc. > > > > On Mon, Mar 18, 2019 at 12:10 PM Mike Short <ai4ns.mike.spam@...> wrote: > > > > Showing my ignorance here. What would be involved with compiling the nano over to the UNO? it would expose more pins, etc.? and the possibility of a different display. > > > > Mike > > AI4NS > > > > > |
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Re: Nano to Uno
#bitx40
Jack Purdum
I'm starting to back away from the Nano a little. The STM32F103 (aka "Blue Pill") is about the same size as the Nano, but is clocked at 72MHz rather than 16MHZ. It has 128K of flash memory (Nano 32K) and 20K of SRAM (Nano 2K). The real limitation of the Nano is the SRAM, as that's where your data is stored. I bought 10 STM32F103's for a little under $30, or less than $3 each. The STM32F103 can be programmed in the Arduino IDE and most, if not all, of the libraries are available for it. There are YouTube videos/Instructables about programming/using it. Jack, W8TEE
On Monday, March 18, 2019, 1:25:11 PM EDT, Laurence Oberman <oberman.l@...> wrote:
Allison is correct, its the nano that has the extra pins. I guess you meant the Arduino Mega, that has many more pins but its a large board Online shows Arduino UNO is one of the most famous board in Arduino family after Arduino Duemilanove. It is the latest design of the basic USB board. It comes with 6 analog inputs, 14 digitals output where 6 of themsupport PWM, and 16Mhz clock speed. Nano It is more or less same functionality as the Arduino UNO but in different package. Instead of using the standard USB to connect to the computer, it uses the mini usb but without the power plug for external power source that built on Arduino UNO. The dimension of Arduino Nano is only 43mm x 18mm, it comes with 6 PWM I/O from the total of 14 digitals I/O, 8 analog inputs, 16Mhz clock speed and 32kB of flash memory. On Mon, Mar 18, 2019 at 1:20 PM ajparent1/KB1GMX <kb1gmx@...> wrote: > > Nano has all the pins of the Uno and two more.? THe nano has AD6 and AD7 not on the Uno. > > Allison > |
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Re: New V5 with poor carrier suppression.
I have no idea how you get +1dBm.
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A 700mv pk-pk square wave centered on ground is 350mV rms (since it's square not sine) Into 50 ohms, that would be 0.350*0.350/50 = 2.5mW,? so? 10*log10(2.5mW/1mW) = 4dBm. But the CLK0 LO is driving a 1:2 transformer which then drives two series Schottky diodes, definitely not a 50 ohm resistor. ? I believe standard practice is to evaluate dBm for the LO into 50 ohms resistance. A? mixer designed for that dBm level should then be able to make good use of the LO. With two Schottky diodes in series and with this transformer arrangement, we should get best performance (maximum signal handling capacity) at 7dBm of LO power,? Signal level going in (from the mike amp) should be at least ~10dB less than the LO, or distortion occurs. The si5351 has 3.3v CMOS output drivers capable of driving up to 8ma, so even without the attenuation of R110,111,112,113, it's not capable of giving 7dBm into 50 ohms. While not ideal, it's adequate for a $130 HF rig. More LO power (especially at the first mixer) would allow the receiver to work with stronger? out-of-band signals present, which hasn't been a hot button issue for the uBitx. It would also allow larger signals through the IF stages when transmitting, but that could also be addressed by adding an amplifier stage to the PA. Jerry, KE7ER On Mon, Mar 18, 2019 at 09:48 AM, jim wrote:
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Re: Nano to Uno
#bitx40
Laurence Oberman
Allison is correct, its the nano that has the extra pins.
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I guess you meant the Arduino Mega, that has many more pins but its a large board Online shows Arduino UNO is one of the most famous board in Arduino family after Arduino Duemilanove. It is the latest design of the basic USB board. It comes with 6 analog inputs, 14 digitals output where 6 of themsupport PWM, and 16Mhz clock speed. Nano It is more or less same functionality as the Arduino UNO but in different package. Instead of using the standard USB to connect to the computer, it uses the mini usb but without the power plug for external power source that built on Arduino UNO. The dimension of Arduino Nano is only 43mm x 18mm, it comes with 6 PWM I/O from the total of 14 digitals I/O, 8 analog inputs, 16Mhz clock speed and 32kB of flash memory. On Mon, Mar 18, 2019 at 1:20 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
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Jim Sheldon
Skip Davis
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