Re: LF: WSPR at 4xf from a Raspberry Pi

[DK7FC <73dk7fc@googlemail.com>]

Hi Joe,

Am 01.04.2015 00:42, schrieb jcraig@mun.ca:
> Hi Stefan,
>
> That's very clever.  It seems the code is quite complex; can you explain
> how it generates a carrier to someone who is an ungifted programmer?
Not really. There are some key-words that i know, like 'fractional 
divider'... but i don't understand the code. But that isn't necessary 
for the modification i wanted to realise.
> My level is not much better than this:
>
> def beep13(t2):
>   i=0
>   while i<500*t2:
>     i+=1
>     GPIO.output(13,1) #GPIO.HIGH)
>     time.sleep(0.001)
>     GPIO.output(13,0) #GPIO.LOW)
>     time.sleep(0.001)
>   return
>
> I used this piece of python as a 500 Hz side tone for a pi keyer but
> doubt it will work at 479 kHz.
Yes, it would not work. I've also tested a similar program to drive a 
LED at high frequencies. The output-f is unstable, high jitter...
If you want to use the WSPR function, you just need to read the 
informations on the links i recently sent. 2 weeks ago i have been in 
the same situation ;-)
73, Stefan

> 73 and thanks for the reports on your progress.
>
> Joe