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UBITX filter bandwidth ?
Has anyone measured the bandwidth of the uBITX filter ???
I have tried it two ways. one with a SA/TG at the 12 mhz filter, and another by feeding in a audio tone from 200 hz to 2800 hz into the mic input from a function generator and using a wattmeter..? Both ways seem to give me a 3 to 6 db bandwidth of about 1600 hz.?? The receive audio seems ok to me, but several hams I talk to almost every day say the audio is not very good, like it is restricted.? I tried moving the BFO up and down about 100 hz at a time to get the best and they tune for the best signal from me incase the frequency is not exact.?? I did change to a Baofeng hand mic and the audio was somewhat better.? I am waiting on some parts to come in to repair a Shure desk mic to see how it sounds.? I am using a similar mic on my Icom 746pro.? I tried feeding my Drake L4B amp and getting around 150 watts out so the signal level is up the about the same as the Icom.? The audio did not seem to change when running the amp or not except it was stronger as it should be. de ku4pt |
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Re: Coding for JackAl
That's the other way to do it.
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This JackAl board is just sampling the audio that we normally hear when listening to the radio. I'd call them both "SDR". Some may disagree. Jerry On Tue, May 22, 2018 at 03:23 pm, John wrote:
Yes Ron, |
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Re: Coding for JackAl
Nope.
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Often in SDR, they use the I and Q channels to retain information regarding the phase of the local oscillator vs the incoming signal, this is then used digitally in the computations to distinguish the signals above the local oscillator from those that are below the local oscillator. On the uBitx, we mix it with the local oscillator, then extract just the upper sideband or the lower sideband in the analog domain using that? narrow 12mhz crystal filter.? ?No need for that phase information. Jerry On Tue, May 22, 2018 at 02:58 pm, W2CTX wrote:
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Re: Coding for JackAl
I need some education...? Don't you need i+q signals for SDR? rOn On May 22, 2018 at 5:16 PM John <vk2eta@...> wrote: |
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Re: spurious signals on FT8
#ubitx
Hello Bo,
Have you checked the volume level you are feeding the uBitx? The mic amp isn't expecting more than 40mV. Also did you have any attenuation turned on the ICOM? The manual says it has settings for 10,20,30 dB attenuation. (I'm terribly curious if that's a hardware attenuator or software based. Looks to be hardware based according to the service manual. 10dB in tuner unit, 20dB in RF unit. Okay.) I wonder if the spurs will go mostly away with 30dB ATT and checking that the sourdcard feed to the mic amp doesn't exceed 40mV. The service manual says there is a 20dB voltage controlled attenuator to keep the ADC from getting swamped. Your two radios are so close I'm still sure the 7300 is showing you spurs due to close proximity. Those are the first 2 things I would check. 73 de Jacob AG7CT |
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Re: Coding for JackAl
The Teensy 3.6 has a floating point unit and can do FIR filtering and more at that sample rate with the audio library.
So the IIR filters used here, which are at least an order of magnitude more CPU efficient, and should not be an issue for the Teensy 3.6. One very interesting feature that opens up with this combination of CPU and library is the USB audio device emulation that would allow a computer to connect via USB for digital modes without a digital interface. Plus the real possibility of on-board decoding and encoding of digital modes as well as built-in SDR. Mind boggling and a hacker's dream that thing is. 73, John (VK2ETA) |
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Re: Raduino CAD Files
I think I may be confused or missing something. Why use usb on blue pill. Like I have always used stlink or ftdi ? to program with . If using usb to communicate with could you not just cut the 5v trace on the board from the usb . ?I have been playing with the blue pill today trying it with cec ?firmware and run into errors with EEPROM ?and get. I have been reading of problems of this. I see that this is being worked on by STM, now whether it has been fixed I have not had time to check this out. The EEPROM ?routine Ian uses ?is very good I see it is being used in the new OEM firmware I have been reading about. Their have always been some quirks using STM processors on Arduino. Mxcube ?or attalis ?may be better option for programming.
Now this is just a thought for going with STM for my programming ability (or disability ) I will probably ?have to go with mega 2560 mini. I have had no problem getting ?Ian's ?firmware to compile on it. I like the STM idea but , hell, I'm ?almost 70, I don't ?need complication. 73's ?kn4ud -- Allen ?Merrell |
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Re: #ubitx #ubitx-help
#ubitx-help
#ubitx
Sounds like somebody just made a wild guess at how wide.
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Or didn't have some of these other issues fully figured out. Did anybody ever evaluate the failure? A skinny trace with feedthroughs such that the owner can choose to cut the trace and put in something better seems a fine compromise. The scheme I presented is $0.10 for the schottky series diode,? otherwise no additional burden to this $109 rig.? Jerry On Tue, May 22, 2018 at 01:36 pm, Jack Purdum wrote:
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spurious signals on FT8
#ubitx
Bo Barry
I've made some successful contacts on FT8 and WSPR using my Raspberry pi and posted a guide on how to do it.
However, monitoring its output on my Icom 7300 I see: ubitx freq 7074.0,? audio transmitted freq USB 1.708kHz? ?so signal should be at 7075.8 MHz On the Icom I see 7072.4, 7074.0, 7074.2 big signal, and 7075.8 Any ideas? Bo W4GHV |
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Re: #ubitx #ubitx-help
#ubitx-help
#ubitx
Jack Purdum
I had a skinny trace fuse on a CRK-10A QRP transceiver which did burn through, but not before it fried virtually everything else on the board. I wouldn't trust a skinny trace fuse in a circuit at all...period. That's sad, too, because it's a really nice rig with an outstanding receiver. Jack, W8TEE
On Tuesday, May 22, 2018, 4:28:17 PM EDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
The relay trick is good, especially if running a kW. At 10W, semiconductors are fine. At a minimum, I'd just make it series schottky diode into the main uBitx rail with a 0.5A fuse there. I have a lot more faith in the $0.10 diode than I would in a $1 ebay relay. Still have a good spot for that idiot light. PA-PWR fused separately at 3A, with beefy enough traces and coils that the fuse blows first when the IRF510's intrinsic diodes see reverse voltage. ? If fuses are deemed too expensive, perhaps just a skinny trace on the PCB where power enters and goes to the series schottky.? Have a big feedthrough on each end to mount a replacement fuse. The 3A PA-PWR fuse could be a thicker trace, or perhaps just a skinny wire to the power connector. A fuse on the ground lead is not something I've ever worried about, but you give a good argument.? Again, maybe just a skinny wire (such as the 26 gauge hookup wire provided with the uBitx) from power connector ground lug? to chassis and PCB grounds is a sufficient fuse there. Jerry, KE7ER On Tue, May 22, 2018 at 12:58 pm, ajparent1/KB1GMX wrote:
My prefered way uses a diode and relay.? Relay has zero voltage drop. |
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Re: #ubitx #ubitx-help
#ubitx-help
#ubitx
The relay trick is good, especially if running a kW.
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At 10W, semiconductors are fine. At a minimum, I'd just make it series schottky diode into the main uBitx rail with a 0.5A fuse there. I have a lot more faith in the $0.10 diode than I would in a $1 ebay relay. Still have a good spot for that idiot light. PA-PWR fused separately at 3A, with beefy enough traces and coils that the fuse blows first when the IRF510's intrinsic diodes see reverse voltage. ? If fuses are deemed too expensive, perhaps just a skinny trace on the PCB where power enters and goes to the series schottky.? Have a big feedthrough on each end to mount a replacement fuse. The 3A PA-PWR fuse could be a thicker trace, or perhaps just a skinny wire to the power connector. A fuse on the ground lead is not something I've ever worried about, but you give a good argument.? Again, maybe just a skinny wire (such as the 26 gauge hookup wire provided with the uBitx) from power connector ground lug? to chassis and PCB grounds is a sufficient fuse there. Jerry, KE7ER On Tue, May 22, 2018 at 12:58 pm, ajparent1/KB1GMX wrote:
My prefered way uses a diode and relay.? Relay has zero voltage drop. |
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Re: #ubitx #ubitx-help
#ubitx-help
#ubitx
My prefered way uses a diode and relay.? Relay has zero voltage drop.
IF the diode does not conduct, ? ? then power to the relay does not happen and power to the board never happens. When the diode/relay combo I add an "idiot led" bicolor before the relay depending on polarity red not good, green good, none means fuse or no power.?? Why go that far? Never loan gear, and bad stuff happens in a hurry. But I still include a fuses (each lead) before the reverse polarity diode.? Why? If the negative side is case and I hook the positive to the case we get sparks and fried wires in most mobile environments.? Lets protect the source. Allison |
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Re: JackAl Board Debut
¿ªÔÆÌåÓýJack Perfect ? art ? From: [email protected] [mailto:[email protected]] On Behalf Of Jack Purdum via Groups.Io
Sent: Tuesday, May 22, 2018 3:38 PM To: [email protected] Subject: Re: [BITX20] JackAl Board Debut ? Art: ? The JackAl board expects to see the display with the following profile: ? Interface??????????????????? 4 wire SPI Power supply type ??? 3.3V Font chip?????????????????? ER33-4-1 ? We really don't need the special font chip and you can use the font supplied with the library. However, the chip is cheap enough we ordered them with the font chip above. The same is true for the 7" display. BuyDisplay.com has the following description at the bottom of the correct display: ? ????????ER-TFTM050-3 is 5 inch tft lcd module WVGA 800x480 display, serial, spi, i2c parallel interface, ??????? RA8875 controller, capacitive or resistive touch screen panel ? This should help you order the correct display. ? Jack, W8TEE ? On Tuesday, May 22, 2018, 2:00:51 PM EDT, Art Olson <olson339@...> wrote: ? ? Jack
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Re: "RADUINO" Versions
Jack Purdum
Anyone happen to have a matrix of the various options ?? (silly question). Kees: I have a great idea for a little project that will keep you out of trouble for a day or two... Jack, W8TEE
On Tuesday, May 22, 2018, 2:24:58 PM EDT, Kees T <windy10605@...> wrote:
Things are happening fast and I'm trying to keep it straight in my old head. Is this list complete relative to the various "Raduino" versions available today ? I may have left some off....... Anyone happen to have a matrix of the various options ?? (silly question). 73 Kees K5BCQ 1) Original "Raduino" with a Nano Ver ? (base Farahan started with and probably what most uBITX units have today) 2) Upgrade to #1 ?? Ver ? 3) Upgrade original "Raduino" with a Nano Ver ? with firmware by Ian Lee, KD8CEC? 4) "RaduinoUMAX" with firmware by Mike Hagen, WA6ISP, (more I/O)? 5) "Raduino Protoneer" (Arduino Zero Compatible Nano-ARM, uses SAM21 microcontroller). Who was/is working on this one ? 6) "Raduino Pill" by Joe, W3JDR (uses a STM32F103 "Blue Pill" microcontroller, lots more I/O) 7) "BITeensio", this is the new one by Jim Shelton, W0EB, more info coming. 8) "JackAl" board this is the "will blow your socks off" design recently announced at FDIM by Jack Purdum, W8TEE, and Al? ? ? ?Peter,??AC8GY (all the capability you should ever want, uses a Teensy 3.6 microcontroller and will cost "a few $$ more" but ? ? ?has?VERY impressive capabilities which highly depends on the guys writing the firmware (as do ALL the above). |
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Re: JackAl Board Debut
Jack Purdum
Art: The JackAl board expects to see the display with the following profile: Interface??????????????????? 4 wire SPI Power supply type ??? 3.3VTouch panel type?????? Resistive SD card interface ???? Not used Font chip?????????????????? ER33-4-1 We really don't need the special font chip and you can use the font supplied with the library. However, the chip is cheap enough we ordered them with the font chip above. The same is true for the 7" display. BuyDisplay.com has the following description at the bottom of the correct display: ????????ER-TFTM050-3 is 5 inch tft lcd module WVGA 800x480
display, serial, spi, i2c parallel interface, ??????? RA8875 controller, capacitive
or resistive touch screen panel This should help you order the correct display. Jack, W8TEE
On Tuesday, May 22, 2018, 2:00:51 PM EDT, Art Olson <olson339@...> wrote:
Jack Need a few more details for the display Info from you: 5" ($34) or 7" ($44) touch screen displaying (using the RA8875 controller chip Questions from vendor Interface Power supply type Touch panel type SD card interface Font chip Want to get parts while you finish board. Realize you are traveling. When you can Art N2AJO > On May 20, 2018, at 11:17 PM, Jack Purdum via Groups.Io <jjpurdum=[email protected]> wrote: > > 5" ($34) or 7" ($44) touch screen displaying (using the RA8875 controller chip |
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Re: "RADUINO" Versions
You also forgot KB1OIQ who went with I2C for display and added keypad and voice
output suitable for low/no vision operators.? Call that #9. I'll be #10.... MIne I may or may not publish when done be the root is 4.3 and it will be a fork of that with a very different UI.? ? The primary change is no rotary encoder, less or no menu, more buttons.? ?I plan to stay with nano or pro-mini (atmega328). Alison |
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Re: Raduino CAD Files
Allen
Sounds like you have a lot of good stuff...I'll have a look.? I'm about 1/2 finished on a Raduino board using the Pill. I'm developing it in DipTrace, which I prefer over Eagle and KiKad. In any case, I think there are file converters. I leave on Sunday for a month long vacation, so nothing will realistically be coming from me until July. Thanks Joe |
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