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Re: CW Mistakes

 

Jim

Good.? That is why I asked the question.?

We are in a bit of a quandary here.? The uBITX is supposed to be minimal
enough to be an inexpensive entry to Ham Radio, yet at the same time it
is supposed to be fully operational for all the modes that it supports.? One
could claim that because it is entry level, it does not need to support fast
CW, but that sort of defeats its purpose.?

Jerry's use of a faster Teensy CPU seems to indicate that the CW stutter
problem may be fixable in several ways, including software, hardware, and
using a faster CPU.? I think we made some progress this morning.? Now to
do some testing and then decide which of the possibilities might be best,
least expensive, most reliable, and so on.

Eventually I would like to see a Teensy as the basis for a new Raduino.
With its speed, memory, and ports it should be possible for a Teensy based?
Raduino to do some very impressive things.? Fast software can replace a lot
of hardware.

Thanks for the information.

Arv
_._


On Sun, May 16, 2021 at 11:21 AM Jim Sheldon <w0eb@...> wrote:
Arv,
I¡¯ll answer this.? TSW has never used an analog voltage divider for our CW routines.? The dot and dash paddle inputs are on two of the teensy¡¯s digital inputs.? There is no timing problem with the keyer whatsoever and it performs nicely from a few WPM to well over 50 WPM. ?

Way back on the V3 uBITX we used the A6 and A7 NANO inputs for separate dot and dash connections, throwing out the voltage divider completely.? We were chastised by many people early on because they claimed A7 was supposed to be a ¡°spare¡±.? We ignored them and used A7 for the dash input anyway.? Our keyer worked right from the beginning.

Jim, W0EB


On May 16, 2021, at 11:54 AM, Arv Evans <arvid.evans@...> wrote:

?
Jerry

Does the new Teensy daughter board for the Raduino still use
the resistive voltage divider to detect whether the CW paddle
closure is DIT or DAH?? If that is true, then it might seem that
the problem may be more related to timing than to voltage
thresholds.?

If that is true, then moving the routine that reads the ADC
might be something to look into.? Just repositioning the ADC
read call in original Arduino code might be all that is needed
for those who are stuck with version 3, 4, 5, or 6 Arduino and
the original Raduino.?

Since the original goal of BITX designs was to make a rig
that those with limited funds could use to get on the air, it
would be great if this DIT versus DIT..DAH problem could
be fixed with just a simple change in software.

Arv
_._




On Sun, May 16, 2021 at 10:20 AM jerry@... <jerry@...> wrote:
On 2021-05-16 07:33, Evan Hand wrote:
> Arv,
> Here is a link to a company that produces the hardware and software to
> replace the v6 Raduino with one that is designed for the Teensy 4.1.
>
>

*** I have it!? Running right now.? The Teensy is orders of magnitude
more powerful than the Nano:? 600MHz clock, a floating point unit( could
do DSP stuff! ) , 8 megabytes of flash, 1 megabyte of RAM, buckets &
barrels of I/O, and built in Ethernet!

? ?I did have to get a new display.? With the original one, the clone
Raduino made unacceptable tuning ticks.? Replacement with a "Hiletgo"
display from
Amazon cured that problem.? So now I have a spare display... More about
that later.

? ?Only thing is... the Teensy is a $30 processor - as opposed to the
nano which costs IIRC $3.

? ? ? ? ? ? ? ? ? ? ? - Jerry KF6VB
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