Terry,
With the latest SW version 1.14.1 doing CW is a no brainer. The hacks needed for it are very simple. Take a look before you waste the BitX resources with a seperate TX.
PJH, N7PXY
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Very nice, thanks! ?I might even be able to remember that when using some other computer.
Oh, and nice to see that representation from Flora OR still outdoes the entire Portland metropolitan area.
Jerry, KE7ER
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On Tue, Jun 13, 2017 at 06:02 pm, Doug W wrote:
Just for fun I registered??
?
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Re: someone just deleted the entire BITX operators map - almost fixed
This could be automated with a Perl script running in a cron job. The www::mechanize::firefox module supports, among many other functions, the automation of clicking around on a web page.
Unfortunately, I haven't done any Google Maps or Web programming.
James
KE4MIQ
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Re: WANTED VK3YE LED LDR AGC diagram
Glad I could help. Look forward to your finished results
Phil - G7BZD
On Wed, Jun 14, 2017 at 6:55 AM, M0LHT <m0lht.huw@...> wrote: thank you Phil.
now that makes more sense to me. i can follow that.?
back to a bit of playing at lunchtime with the old soldering gun.
thanks ill post a photo or two once its done.
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
OK, now I have checked the ATmega328P documentation.
The digital IO pins have a pull-up only, guaranteed to be between 30k and 60k, which can be disabled.
The ATmega328P does not have an option to make it a pull-down like some processors do.
So me, I'd add an extra 10k resistor from the LM78L05 output to ground, and continue to use A0 as a digital input.
If you scope the LM78L05 output and find that when 12v TX is shut down the A0 line immediately falls from 5v to 3v, and then slowly decays toward zero, perhaps the analog read trick would work. ? But not something I would do.
John Smith:
> I already have right channel PTT circuit in the form of the Fldigi CW keying circuit
If all I wanted was a simple way to drive the Bitx40 for CW, I'd add an extra 10k resistor and skip all the FLdigi stuff.
If you already have the FLdigi stuff somehow dealing with this PTT thing, that's great.
Jerry, KE7ER
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On Wed, Jun 14, 2017 at 10:45 am, Jerry Gaffke wrote:
I haven't looked at the Nano documentation for the effective resistance of their pullup/pulldown scheme,
but it's most likely well under 100k.
?
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Allard:
> Another way to circumvent this situation might be to define A0 as an analog input?
I think I'd add a pulldown resistor somehow, make the behavior vaguely defined.
As you have found, there are significant differences between rigs on how fast that charge leaks away.
Using the extra complication of an ADC to read a digital input pains my soul, and is not guaranteed to fix the problem.
Jack:
> If the internal pull-up resistors on a pin are activated, doesn't that impact the voltage seen on the pin?
I haven't looked at the Nano documentation for the effective resistance of their pullup/pulldown scheme,
but it's most likely well under 100k.
You could program the Nano to give A0 a pulldown and use that instead of my $0.01 10k resistor.
Would probably work, and would probably happen within 10ms or so.
> ?Also, if the code does a?digitalRead(), the documentation says it returns HIGH or LOW.
> ?Is it true a digital read of a pin can return an "in-between" value with the internal pull-ups active??
You either get a 0 or a 1 back when you read a pin with digitalRead(). ?If the voltage at the pin happens to be midrange the result is indeterminate, but the result will be either a 1 or a 0.
Jerry, KE7ER
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On Wed, Jun 14, 2017 at 10:08 am, Allard PE1NWL wrote:
Another way to circumvent this situation might be to define A0 as an
analog input and define a higher threshold for a digital LOW/HIGH. What do
you think?
?
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Allard:
I'd give this a try.
Jack, W8TEE
From: Allard PE1NWL <pe1nwl@...>
To: [email protected]
Sent: Wednesday, June 14, 2017 1:09 PM
Subject: Re: [BITX20] CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Hmm, yes you may be right that in some cases the 7805 output hasn't
dropped sufficiently to represent a digital LOW.
Another way to circumvent this situation might be to define A0 as an
analog input and define a higher threshold for a digital LOW/HIGH. What do
you think?
73 Allard PE1NWL
On Wed, June 14, 2017 18:07, Jerry Gaffke via Groups.Io wrote:
> The code is doing a digitalRead(PTT_SENSE), I'd expect the threshold on
> the nano to be somewhere between 1 and 2 volts
> The problem is that when the +12v TX line into the LM78L05 at U3 goes to
> zero volts, the output of U3 remains up around 5v because there is no
> place for the charge on C150 and C151 to go. ??The pulldown resistor will
> eventually discharge those caps. ??The RC time constant of 0.2uF*20k = 4
> milliseconds, which should be fast enough. ??I'd put that new 10k resistor
> from U3-1 to ground, rather than from A0 to ground, the latter case would
> reduce the maximum voltage into the Nano A0 pin down from 5v to 2.5v.
> ??This also reduces the RC time constant to 2 milliseconds.
> ??
>
> On Wed, Jun 14, 2017 at 08:28 am, Jack Purdum wrote:
>
>>
>> Given your code, Allard, I'm surprised he needs a dropping resistor on
>> that line.
>> ??
>>
>
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Funny you should ask.. As I was reading Jack's post I was thinking, it's
an analog line, use it like one.
Vince.
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Hmm, yes you may be right that in some cases the 7805 output hasn't
dropped sufficiently to represent a digital LOW.
Another way to circumvent this situation might be to define A0 as an
analog input and define a higher threshold for a digital LOW/HIGH. What do
you think?
73 Allard PE1NWL
On Wed, June 14, 2017 18:07, Jerry Gaffke via Groups.Io wrote:
The code is doing a digitalRead(PTT_SENSE), I'd expect the threshold on
the nano to be somewhere between 1 and 2 volts
The problem is that when the +12v TX line into the LM78L05 at U3 goes to
zero volts, the output of U3 remains up around 5v because there is no
place for the charge on C150 and C151 to go. ??The pulldown resistor
will
eventually discharge those caps. ??The RC time constant of 0.2uF*20k = 4
milliseconds, which should be fast enough. ??I'd put that new 10k
resistor
from U3-1 to ground, rather than from A0 to ground, the latter case
would
reduce the maximum voltage into the Nano A0 pin down from 5v to 2.5v.
??This also reduces the RC time constant to 2 milliseconds.
??
On Wed, Jun 14, 2017 at 08:28 am, Jack Purdum wrote:
Given your code, Allard, I'm surprised he needs a dropping resistor on
that line.
??
--
Michigan VHF Corp.
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Hmm, yes you may be right that in some cases the 7805 output hasn't
dropped sufficiently to represent a digital LOW.
Another way to circumvent this situation might be to define A0 as an
analog input and define a higher threshold for a digital LOW/HIGH. What do
you think?
73 Allard PE1NWL
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On Wed, June 14, 2017 18:07, Jerry Gaffke via Groups.Io wrote: The code is doing a digitalRead(PTT_SENSE), I'd expect the threshold on
the nano to be somewhere between 1 and 2 volts
The problem is that when the +12v TX line into the LM78L05 at U3 goes to
zero volts, the output of U3 remains up around 5v because there is no
place for the charge on C150 and C151 to go. ??The pulldown resistor will
eventually discharge those caps. ??The RC time constant of 0.2uF*20k = 4
milliseconds, which should be fast enough. ??I'd put that new 10k resistor
from U3-1 to ground, rather than from A0 to ground, the latter case would
reduce the maximum voltage into the Nano A0 pin down from 5v to 2.5v.
??This also reduces the RC time constant to 2 milliseconds.
??
On Wed, Jun 14, 2017 at 08:28 am, Jack Purdum wrote:
Given your code, Allard, I'm surprised he needs a dropping resistor on
that line.
??
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
I must have misunderstood. If the internal pull-up resistors on a pin are activated, doesn't that impact the voltage seen on the pin? Also, if the code does a digitalRead(), the documentation says it returns HIGH or LOW. Is it true a digital read of a pin can return an "in-between" value with the internal pull-ups active??
Jack, W8TEE
From: Jerry Gaffke via Groups.Io <jgaffke@...>
To: [email protected]
Sent: Wednesday, June 14, 2017 12:07 PM
Subject: Re: [BITX20] CW Offset does NOT work on Raduino_v1.14.1 for BITX40
The code is doing a digitalRead(PTT_SENSE), I'd expect the threshold on the nano to be somewhere between 1 and 2 volts The problem is that when the +12v TX line into the LM78L05 at U3 goes to zero volts, the output of U3 remains up around 5v because there is no place for the charge on C150 and C151 to go. ?The pulldown resistor will eventually discharge those caps. ?The RC time constant of 0.2uF*20k = 4 milliseconds, which should be fast enough. ?I'd put that new 10k resistor from U3-1 to ground, rather than from A0 to ground, the latter case would reduce the maximum voltage into the Nano A0 pin down from 5v to 2.5v. ?This also reduces the RC time constant to 2 milliseconds. ? On Wed, Jun 14, 2017 at 08:28 am, Jack Purdum wrote:
Given your code, Allard, I'm surprised he needs a dropping resistor on that line.
?
?
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That's another option. I already have right channel PTT circuit in the form of the Fldigi CW keying circuit. I was wondering if I will incorporate it. The final design is still floating around in my head. When this and Allard's added functionalities are done, this will be like a all mode 40 meter radio.?
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
The code is doing a digitalRead(PTT_SENSE), I'd expect the threshold on the nano to be somewhere between 1 and 2 volts
The problem is that when the +12v TX line into the LM78L05 at U3 goes to zero volts, the output of U3 remains up around 5v because there is no place for the charge on C150 and C151 to go. ?The pulldown resistor will eventually discharge those caps. ?The RC time constant of 0.2uF*20k = 4 milliseconds, which should be fast enough. ?I'd put that new 10k resistor from U3-1 to ground, rather than from A0 to ground, the latter case would reduce the maximum voltage into the Nano A0 pin down from 5v to 2.5v. ?This also reduces the RC time constant to 2 milliseconds.
?
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On Wed, Jun 14, 2017 at 08:28 am, Jack Purdum wrote:
Given your code, Allard, I'm surprised he needs a dropping resistor on that line.
?
?
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Given your code, Allard, I'm surprised he needs a dropping resistor on that line.
Jack, W8TEE
From: Allard PE1NWL <pe1nwl@...>
To: [email protected]
Sent: Wednesday, June 14, 2017 10:51 AM
Subject: Re: [BITX20] CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Hi Hidehiko-san Yes you could be right. Another possible cause could be poor grounding of BITX main board and Raduino board. If Raduino board is not grounded perfectly, some small potential difference may exist between BITX board and Raduino. As a result, A0 input will not be perfectly zero volts when PTT is not pressed. 73 Allard PE1NWL On Wed, June 14, 2017 15:33, qrper72@... wrote: > I've put the 10k pull-down register at the "A0" and maybe the problem > seems to be fixed now. This issue caused by the threshold problem? > > ja9mat Hidehiko. >
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Hi Hidehiko-san
Yes you could be right.
Another possible cause could be poor grounding of BITX main board and
Raduino board.
If Raduino board is not grounded perfectly, some small potential
difference may exist between BITX board and Raduino. As a result, A0 input
will not be perfectly zero volts when PTT is not pressed.
73 Allard PE1NWL
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On Wed, June 14, 2017 15:33, qrper72@... wrote: I've put the 10k pull-down register at the "A0" and maybe the problem
seems to be fixed now. This issue caused by the threshold problem?
ja9mat Hidehiko.
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
I've put the 10k pull-down register at the "A0" and maybe the problem seems to be fixed now. This issue caused by the threshold problem?
ja9mat Hidehiko.
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If you're using FLDIGI take a look at??
The PTT tone on the right channel eliminates the need for a USB serial adapter and relay circuit; you only need the mic and speaker wires between the sound card and BITX40. In my setup there is no difference in performance with or without the transformers but they're only $1 on Amazon so why not.
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
TKS Allar,
OK but it is not a display issue.
800Hz frequency shift does not occur so I can not QSO with hi..
When I attach the voltmeter between "A0" and "GND" the problem is solved sometimes
but not stable. hi...
Maybe the "A0" PTT-SENSE signal line should be pull-up or pull-down?
ja9mat hidehiko.
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hi
i have decided that the best way to go cw on the bitx40 is to build a separate tx and use the bitx40 in receive mode only.
terry
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Oscilloscope testing beginers guide
I have reciently purchased a Usb picoscope ...
In order to check and align things up I find hard to know the points and expecting measuremnts that I should get.?
Anyone with experience out there?
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Re: CW Offset does NOT work on Raduino_v1.14.1 for BITX40
Hidehiko-san,
The frequency as shown on the display is always the TX carrier frequency.
In CW mode, the RX frequency is shifted by 800 Hz, not the TX frequency.
73, Allard PE1NWL
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On Wed, June 14, 2017 11:58, qrper72@... wrote: Hi all,
Does anyone try to QRV the CW mode by Raduino_v1.14.1 for BITX40?
Does it really works?
Here in my situation. The TX frequency does not down 800Hz when I select
LSB mode.
Any suggestions welcome.
ja9mat hidehiko.
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Allard PE1NWL
Hidehiko Komachi - JA9MAT