Re: Bitx40 Raduino question
tim ?you don't have to
?i am as new. what you can do? at device manager? after connecting the suspect raduino of bitx40,?? refresh plug and play devices. ? after that , please check under ports any new port added . ?
?under arduino ide you cnl call for the firmware and select the nano and the com port as you found in device manager. ?I wonder, whether i am able to communicate my thought regards sarma vu3zmv
Im not sure I am understanding.? I cannot load anything onto the bitx40 arduino as it does not even show up in the device manager.? The arduino program gives me an error to select a port but there is no ports available to select.??
As I say, I am very much a novice at this? so if i misunderstood your directions, i do apologize.
Tim
KF7VUT
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Re: Bitx40 Raduino question
I just saw the post where you state you have the CH340 installed...my bad.
Jack, W8TEE
On Saturday, November 10, 2018, 11:18:29 AM EST, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
To me, it sounds like you don't have the correct device driver installed. I think you need the CH340 device driver installed. Go to this site:
and follow the directions for downloading and installing the device drivers. Once the device driver is installed, turn your computer off and then on (e.g., a reboot). Then reload the Arduino IDE and see if you can see an Arduino port.
Jack, W8TEE
On Saturday, November 10, 2018, 11:09:50 AM EST, Tim K <marshalldtk@...> wrote:
Im not sure I am understanding.? I cannot load anything onto the bitx40 arduino as it does not even show up in the device manager.? The arduino program gives me an error to select a port but there is no ports available to select.??
As I say, I am very much a novice at this? so if i misunderstood your directions, i do apologize.
Tim
KF7VUT
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Re: Bitx40 Raduino question
To me, it sounds like you don't have the correct device driver installed. I think you need the CH340 device driver installed. Go to this site:
and follow the directions for downloading and installing the device drivers. Once the device driver is installed, turn your computer off and then on (e.g., a reboot). Then reload the Arduino IDE and see if you can see an Arduino port.
Jack, W8TEE
On Saturday, November 10, 2018, 11:09:50 AM EST, Tim K <marshalldtk@...> wrote:
Im not sure I am understanding.? I cannot load anything onto the bitx40 arduino as it does not even show up in the device manager.? The arduino program gives me an error to select a port but there is no ports available to select.??
As I say, I am very much a novice at this? so if i misunderstood your directions, i do apologize.
Tim
KF7VUT
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You posted this on the 8th. I didn't get it until this morning - something's going on with groups.io as their emails are delayed anywhere from 1 to 5 days lately. Tim Gorman was complaining about the same thing. May just be our ISP (we are both on the same one) and the way groups.io sends email. Funny though, 4SQRP is also on groups.io and their stuff arrives just fine and on time.
Jim
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------ Original Message ------ From: "W2CTX" <w2ctx@...> To: [email protected]Sent: 11/8/2018 1:18:11 PM Subject: Re: [BITX20] WSJT-X Split Operations #ft8 #ubitx I believe CEC "split" has been incorrectly coded since day one.
rOn
On November 7, 2018 at 1:35 PM roger wincer <zedl2rx@...> wrote:
Bruce...I have had the same problem. So have disabled "split" on the WSJTX software and all is okay now. I have used the "split" facility before on another rig with no problem.
There appears to be a problem with the CEC software regarding all uses of "split" or "RIT". I have noticed when using "Split" VFOs in that, the receive VFO after the first transmission becomes the same value as the transmit VFO. This is also the case with RIT.
Has anyone else seen this? I have seen it with ver 1.08 and 1.1
Roger ZL2RX
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Re: Bitx40 Raduino question
Im not sure I am understanding.? I cannot load anything onto the bitx40 arduino as it does not even show up in the device manager.? The arduino program gives me an error to select a port but there is no ports available to select.??
As I say, I am very much a novice at this? so if i misunderstood your directions, i do apologize.
Tim
KF7VUT
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Re: Bitx40 Raduino question
If device manage is recognizing ch340,? you can try to load firmware if you had the procedure practiced once atleast. It might call for a calibration. ?why not try calibration with some known time signal, like 10MHz from China ?
sarma ?vu3zmv
Yed, both working devices show ch340 in the device manager.
Tim
KF7VUT
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Re: Bitx40 Raduino question
Yed, both working devices show ch340 in the device manager.
Tim
KF7VUT
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This might be an opportunity for somebody to create yet another new Raduino
Add buffer amps to all three clocks from the si5351 to help solve the spur problem.
Choose a processor clock that won't beat with the BFO, creating audio tones cases
where the Nano's 16mhz ceramic resonator happens to fall on an unlucky frequency .
Communicate with a host processor via well filtered 3v UART lines
that go off to a well shielded USB-to-UART dongle.
Processor is a little beefier, something like an STM32F*, not pressed for memory space,
more IO pins, and with the horsepower for a few simple digital modes such as PSK31.
This could easily be used to upgrade old v3 and v4 uBitx's.
Jerry, KE7ER
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On Sat, Nov 10, 2018 at 06:41 AM, Jerry Gaffke wrote:
Unless we add an amp to each of the three clocks between the si5351 and the mixers,
we are trading off si5351 crosstalk, local oscillator injection level, and reflections due to?
driving the mixer from a source impedance higher than 50 ohms.
All three of these factors will contribute to spurs.
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Re: Bitx40 Raduino question
Tim, check whether both are using CH340g. ?
Thanks Vic for the reply.? Yes that is correct it power on with just a USB plugged in but the computer acts like it doesn't see anything (windows 10 and windows 7).? I have another Arduino board and the board with my uBitx show up fine in the device manager.? My guess is that maybe the USB is bad on the bitx40 board but, just a guess.
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Re: Bitx40 Raduino question
Thanks Vic for the reply.? Yes that is correct it power on with just a USB plugged in but the computer acts like it doesn't see anything (windows 10 and windows 7).? I have another Arduino board and the board with my uBitx show up fine in the device manager.? My guess is that maybe the USB is bad on the bitx40 board but, just a guess.
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Unless we add an amp to each of the three clocks between the si5351 and the mixers,
we are trading off si5351 crosstalk, local oscillator injection level, and reflections due to?
driving the mixer from a source impedance higher than 50 ohms.
All three of these factors will contribute to spurs.
One might replace the 100 ohm and 75 ohm resistors of my previous email
with small pots, then try various settings to find the best compromise.
?
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On Fri, Nov 9, 2018 at 08:37 PM, Jerry Gaffke wrote:
I suggest each si5351 clock pin drive a series DC blocking cap and a series 100 ohm resistor
into the mixer port.? Assuming the si5351 has not hit its 8ma current limit, the mixer will
see a source impedance of 50 ohms (internal to the si5351) plus that 100 ohm resistor, so 150 ohms.
Add a 75 ohm resistor from mixer port to ground, that in parallel with 150 ohms makes
it a 50 ohm source impedance for the mixer.
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You need to put your radio in calibration mode and change the frequency calibration and after retune the bfo.?
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Re: Bitx40 Raduino question
Just to understand the problem correctly: Your BitX40 is receiving and displaying correctly using the OEM sketch and you want to upload a new sketch, is that right? And, you do not see any additional device on the device manager when it is plugged in?
When you plug in the USB cable to the computer, does the Raduino power up from the USB voltage and display correctly?
=Vic=
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Re: DIGITAL FREQUENCY READOUT
Generally ch340 G works off12MHz resonator. On the photo of r arduino pcb i clearly read 25MHz, thanks for the nice focusing
On Sat, Nov 10, 2018 at 3:30 AM MONEYSMITH < w4nfr@...> wrote: I WANT TO BUY? "The Raduino board with Si5351, Arduino Nano. Fully
tested AND PROGRAMMED." I DON'T NEED THE LCD READOUT.
HOW MUCH AND WHERE CAN I ORDER?
WILLIAM
On 11/9/2018 1:32 PM, MONEYSMITH wrote:
> THANK YOU
>
> On 11/9/2018 1:21 PM, Vince Vielhaber wrote:
>> The crystal is on the green board under the display.? Unplug the
>> display and you'll see it.
>>
>> Vince.
>>
>>
>> On 11/09/2018 03:26 PM, MONEYSMITH wrote:
>>> THIS BOARD HAS A MEGA328P CHIP. I HAVE NO INFORMATION ON THE BOARD.
>>>
>>> I FOUND NO SI5351A CHIP?
>>>
>>> PHOTOS ATTACHED.
>>>
>>> W4NFR
>>>
>>> On 11/9/2018 11:42 AM, Arv Evans wrote:
>>>> Bill W4NFR
>>>>
>>>> The picture you provided is the back side of an Arduino Nano board.
>>>> The crystals on this PCB
>>>> have nothing to do with the transmitting frequency of your
>>>> transceiver.? The SI5351a frequency
>>>> synthesizer is a small 10-pin MSOP IC, or 20-pin QFN IC.? It should be
>>>> clearly labeled on the
>>>> top as an Si5351A device.? Do you have a picture of the Raduino board
>>>> with its Si5351A chip
>>>> and crystal?
>>>>
>>>> Arv? K7HKL
>>>> _._
>>>>
>>>>
>>>> On Fri, Nov 9, 2018 at 11:20 AM MONEYSMITH <w4nfr@...
>>>> <mailto:w4nfr@...>> wrote:
>>>>
>>>> ??? HERE IS A PHOTO OF BOARD AND CRYSTAL.
>>>>
>>>> ??? W4NFR
>>>>
>>>> ??? On 11/9/2018 9:57 AM, Mvs Sarma wrote:
>>>>> ??? OMG. acidentally crept in perhaps .
>>>>> ??? could you please share a? photo please, !!!!!
>>>>>
>>>>> ??? regards
>>>>> ??? sarma
>>>>> ???? vu3zmv
>>>>>
>>>>> ??? On Fri, Nov 9, 2018 at 10:50 PM MONEYSMITH <w4nfr@...
>>>>> ??? <mailto:w4nfr@...>> wrote:
>>>>>
>>>>> ??????? I OPENED UP MY uBITX? AND TOOK A LOOK AT THE S1535A BOARD.
>>>>> ??????? THE CRYSTAL HAS 20.0 STAMPED ON IT INSTEAD OF 25.0 MHZ?
>>>>>
>>>>> ??????? On 11/8/2018 5:59 PM, RCC WB5YYM wrote:
>>>>>> ??????? The crystal is not "bad"
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------
>>>>>
>>>>> ??????? AVG logo <>
>>>>>
>>>>> ??????? This email has been checked for viruses by AVG antivirus
>>>>> ??????? software.
>>>>> ??????? <>
>>>>>
>>>>>
>>>>> <#m_4175695945886965737_m_2844835715575407798_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>>>>
>>>>>
>>>
>>
>
> ---
> This email has been checked for viruses by AVG.
>
>
>
>
>
>
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Re: CEC firmware installation using a MAC
You can use this tool?
However you have to install Arduino IDE that this tool needs that when uploading.
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To drastically increase the Q and thus the notch depending on whether the circuit is in series or in parallel one can lower or increase the impedance of the filters with impedance transformers at the input and the output of the filter. It would add complexity and likely lower the TX output.
Il 10/nov/2018 07:20, "iz oos" < and2oosiz2@...> ha scritto: Right Brian, I don't really understand that as well. Maybe it might make sense but I should see how the schematics would be. The 91mhz might make sense to notch out the harmonics of 45mhz if this is the cause of the spur. Apart from the resonances I would look at the Q factor as well.
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Right Brian, I don't really understand that as well. Maybe it might make sense but I should see how the schematics would be. The 91mhz might make sense to notch out the harmonics of 45mhz if this is the cause of the spur. Apart from the resonances I would look at the Q factor as well.
Il 09/nov/2018 21:49, "Brian L. Davis" < brianldavis@...> ha scritto: 10pf series with .3uhy - resonant about 91 MHz
47pf series with 5.0uhy resonant about 10.4 MHz
Is this correct?
Brian - WA5RDG
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Received the circuit board from a group member! Thank you!
Darryl
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you are right jerry. i remember encountering this ... back to the bench to try this out... - f
On Sat, 10 Nov 2018, 10:07 Jerry Gaffke via Groups.Io <jgaffke= [email protected] wrote: How did you arrive at 47pF and 5uH for 12mhz?
freq = 1/(2*pi*sqrt(L*C)) = 1/(2*pi*sqrt(47e-12 * 5e-6)) =?10382123 Hz
Though that 30mhz LPF is a fairly complicated network to hang an LC trap on,
there may be more going on here.?
The 12mhz trap my not be needed if you reduce the loading on the si5351 clocks
since this would reduce crosstalk between clocks within the si5351.
?
Table 3, "DC Characteristics", in the si5351 datasheet says the output impedance is 50 ohms.
My best guess is that this means there is effectively a series 50 ohm resistor between the?
CMOS driver and the output pin.? If you then put a 50 ohm external load to ground on it and?
the driver is trying to drive high to 3v, then the expected current would be 3v/(50+50ohms) = 30ma.
But the output driver is limited to 8ma, so that output will be current starved.
And with three clocks all working hard as they possibly can, the crosstalk is pretty bad on the si5351.
So we want an external load that's more than 50 ohms on the si5351 clock pin,
but we want the mixer to see a 50 ohm source impedance to avoid reflections.
A pi network resistive attenuator is not a good choice.
I suggest each si5351 clock pin drive a series DC blocking cap and a series 100 ohm resistor
into the mixer port.? Assuming the si5351 has not hit its 8ma current limit, the mixer will
see a source impedance of 50 ohms (internal to the si5351) plus that 100 ohm resistor, so 150 ohms.
Add a 75 ohm resistor from mixer port to ground, that in parallel with 150 ohms makes
it a 50 ohm source impedance for the mixer.
Jerry, KE7ER
it?
On Fri, Nov 9, 2018 at 05:53 PM, Ashhar Farhan wrote:
allison and others,
?
the traps are capable of adding a notch of -20 db. so even if you don't hit the bottom precisely, a 10 db reduction is all that is necessary to clean it up to the required level.
?
these are meant to be fixes that work with existing boards : from v1 onwards. i tried to choose a method that was easy to do.
we will need a different post mix if amp design going forward
yes the traps are for 90 mhz and 12 mhz.
?
the 10 mhz insensitivity is something i will look into today, I havent experienced it. perhaps we should move the trap to tx filters for the 21 mhz to 28 mhz band? the 12 mhz is filtered for the lower bands in any case.
?
the other place to apply the 12 mhz trap would be the local oscillator output?
?
another simple mod to be applied is to change R26 and R46 from 470 ohms to 220. the darlington pair was having insufficient current adding to distortion woes. ?
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How did you arrive at 47pF and 5uH for 12mhz?
freq = 1/(2*pi*sqrt(L*C)) = 1/(2*pi*sqrt(47e-12 * 5e-6)) =?10382123 Hz
Though that 30mhz LPF is a fairly complicated network to hang an LC trap on,
there may be more going on here.?
The 12mhz trap my not be needed if you reduce the loading on the si5351 clocks
since this would reduce crosstalk between clocks within the si5351.
?
Table 3, "DC Characteristics", in the si5351 datasheet says the output impedance is 50 ohms.
My best guess is that this means there is effectively a series 50 ohm resistor between the?
CMOS driver and the output pin.? If you then put a 50 ohm external load to ground on it and?
the driver is trying to drive high to 3v, then the expected current would be 3v/(50+50ohms) = 30ma.
But the output driver is limited to 8ma, so that output will be current starved.
And with three clocks all working hard as they possibly can, the crosstalk is pretty bad on the si5351.
So we want an external load that's more than 50 ohms on the si5351 clock pin,
but we want the mixer to see a 50 ohm source impedance to avoid reflections.
A pi network resistive attenuator is not a good choice.
I suggest each si5351 clock pin drive a series DC blocking cap and a series 100 ohm resistor
into the mixer port.? Assuming the si5351 has not hit its 8ma current limit, the mixer will
see a source impedance of 50 ohms (internal to the si5351) plus that 100 ohm resistor, so 150 ohms.
Add a 75 ohm resistor from mixer port to ground, that in parallel with 150 ohms makes
it a 50 ohm source impedance for the mixer.
Jerry, KE7ER
it?
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On Fri, Nov 9, 2018 at 05:53 PM, Ashhar Farhan wrote:
allison and others,
?
the traps are capable of adding a notch of -20 db. so even if you don't hit the bottom precisely, a 10 db reduction is all that is necessary to clean it up to the required level.
?
these are meant to be fixes that work with existing boards : from v1 onwards. i tried to choose a method that was easy to do.
we will need a different post mix if amp design going forward
yes the traps are for 90 mhz and 12 mhz.
?
the 10 mhz insensitivity is something i will look into today, I havent experienced it. perhaps we should move the trap to tx filters for the 21 mhz to 28 mhz band? the 12 mhz is filtered for the lower bands in any case.
?
the other place to apply the 12 mhz trap would be the local oscillator output?
?
another simple mod to be applied is to change R26 and R46 from 470 ohms to 220. the darlington pair was having insufficient current adding to distortion woes. ?
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Jim Sheldon
_Dave_ AD0B
Vic WA4THR
TA2WK