Re: Generating CW-morse signals with a straight key

[Harald Fritzsche (DD0VS)]

Hello Frank, all,

i got Jackd2 installed on this RPI4 and GnuRadio works together with
Jack under some circumstances (start Qjackctl first, than GRC with the
script, a second start of the script is not anymore connecting to jack,
i have to restart jack to run it again.).

Latency is reasonable in case of my block is constructed with:
cw_key_impl::set_max_noutput_items(48); //where cw_key_impl is the OOT
(There is a poll thread and a keyer thread locked with
cw_key_impl::work()!, this should synchronize polling, debouncing and
work())

But occasionally underruns appear in GR (jU).
Increase of max_output_items to 64 or higher increases latency
significantly.

There is another sw (from N1GP) implementing an iambic keyer (including
straight key function) with GPIO and Jack, this sw never connects to
jackd (this is a hint for Jack). Here i am still searching for a
solution.

I think my trial and error methode scetched above isn't realy a
sustainable solution.

Regards and vy73
Harald
DD0VS



 Am Sat, 28 Dec 2019 11:18:26 -0800
schrieb Frank Brickle <address@hidden>:

> Is there a JACK audio sink in Gnuradio these days?
> 
> I'm not sure where they are housed, now, but I wrote a few programs to
> generate CW this way some years ago. They depended on having JACK
> audio input to the application. One of them could use either a
> straight key or would work as a decent iambic keyer. The other
> generated CW tone from text input, either from a file or directly
> from stdin and therefore from a keyboard.
> 
> If there were any interest I could probably dig up the source.
> 
> 73
> Frank
> AB2KT/VE7
> 
> 
> On Sat, Dec 28, 2019 at 11:06 AM Gorkem Ozcelebi <address@hidden>
> wrote:
> 
> > If I've understood your question correctly, how about the
> > microphone / audio input? If it's ac-coupled, you could use a
> > simple oscillator. The presence of the tone, gated by your morse
> > key, triggers the cw. If you don't want to build / provide an
> > external oscillator,  how about a software oscillator fed through
> > one of the audio output channels of the same PC, going back in thru
> > your morse key. The other audio channel is left available for the
> > audio output of your receiver.
> >
> > Gorkem
> >
> > On Sat, Dec 28, 2019, 7:25 PM Harald Fritzsche (DD0VS)
> > <address@hidden> wrote:
> >  
> >> Hello All,
> >>
> >> Hoping that amateur radio is not to far away from common use of
> >> Gnuradio mailing list, but amateur radio is making me looking to GR
> >> since 2001.
> >> There is a plan to use a Gnuradio based transceiver for µ-wave
> >> contesting, as it has been shown by W7FU or KB1VC (SoDaRadio) or
> >> DL9SW. A needed condition is, to key HF with morse code using a
> >> straigth or simple morse key.
> >>
> >> Doing this with just looking to the status of /dev/ttyUSB0-CTS pin
> >> is not sufficient, basically some of the keyed code is somehow
> >> swalloed. Neither with python code or with a C++ OOT module i got
> >> it solved.
> >>
> >> How to get this solved? (Hardware keying or modulated cw is not a
> >> real option).
> >>
> >> Regards and vy73
> >> Harald
> >> DD0VS
> >>
> >>  
>