[time-nuts] Advice on good reception for radio clocks

[Tony Finch]

Andrew Back <andrew at carrierdetect.com> wrote:
>
> I got one of those SYMTRIK modules working but the antenna orientation
> did seem a bit fiddly, and this was MSF and not DCF77.
>
>   http://www.designspark.com/content/atomic-time-raspberry-pi
>
> Don't suppose you're using a Raspberry Pi for this? I'd like to get
> this working with its GPIO rather than using a USB-serial, which only
> really served as a proof-of-concept.

That's exactly my setup yes :-)

I got the GPIO working without much trouble, using a cleaned-up version of
the example C code from the Wiki

http://elinux.org/Rpi_Low-level_peripherals#GPIO_Driving_Example_.28C.29

though I had to look at the data sheet for the GPIO read address

	#define GPIO_GET gpio[13]

The shell / filesystem interface to the kernel GPIO driver was also handy
for testing.

Tony.
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