Re: LF: Methods to transmit DFCW

[Markus Vester <markusvester@aol.com>]

Hi Paul,

guess my preferred method is a linear SSB exciter which can do all sorts of modes, including specialties like chirped Hell and picture transmissions, or 1-dB stepped power tests. On the other hand with one sitting here this is easily said ;-)

Stefan and Tom have successfully employed a Raspberry Pi, which can produce modulated RF directly on one of it's digital output pins. This has been used for WSPR but I guess it could also make DFCW.

Best 73,
Markus (DF6NM)  


-----Ursprüngliche Mitteilung-----
Von: N1BUG <paul@n1bug.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Cc: lowfer <lowfer@mailman.qth.net>
Verschickt: Fr, 16. Nov. 2018 12:34
Betreff: Re: LF: Methods to transmit DFCW

Thanks Andy. I have no proficiency at all in PIC or Arduino
programming. In my younger days I wrote some reasonably complex DOS
programs but a lot has happened since then an the old brain isn't
what it used to be I'm afraid.

I am not against *trying* to learn but will consider this a last
resort if no more complete or operator friendly system can be found.

73,
Paul

On 11/14/18 10:42 AM, Andy Talbot wrote:
> Depends how proficient you are with PIC or Arduino or Whatever programming.
> There are still AD9850 moduiles to be found on Ebay - that are not
> completely obsolete or sold-out yet.
>
> Write your controller code to switch between two or three (for DFCWi)
> frequencies under control of the ON7YD software, toggling RTS / DTR on a
> COM port interface (use an FTDI USB one if necessary)
>
>
> www.g4jnt.com
>
>
>
> On Wed, 14 Nov 2018 at 11:50, N1BUG <paul@n1bug.com> wrote:
>
>> I am looking for a better method to transmit DFCW for 2200 meter
>> QSOs. For my QSO with 2E0ILY I used a QRP Labs U3S for the
>> transmitter. This worked very well for DFCW60 when I was
>> transmitting every other night. For any QSO attempts involving quick
>> change from RX to TX it would be difficult because of the time
>> required to program a new message!
>>
>> One possibility would be to modify this method used by N1VF for JT9
>> QSOs with a U3S:
>>
>> https://bgelb.github.io/u3s-qso.html
>>
>> I am a little concerned about messing up my trusty U3S but I may try
>> that.
>>
>> It looks like the easy way is the old QRS software by ON7YD. This is
>> very interesting but I don't have a suitable transmitter. Are there
>> any published designs for DFCW transmitters which could be
>> controlled in this way? I wonder if parts would still be available?
>> I am guessing these used synthesizers which are not current
>> generation any more. :-)
>>
>> Any other suggestions?
>>
>> 73,
>> Paul N1BUG