[ntp:questions] Can the line audio out of HF radio be used to sync ntp. Trying to get a cheap ($) radio method.
Todd Glassey CISM CIFI
tglassey at earthlink.net
Thu Apr 30 19:22:40 UTC 2009
Richard B. Gilbert wrote:
> David J Taylor wrote:
>> Unruh wrote:
>>> Nathaniel Homier <ntp at universal-mechanism.org> writes:
>>>> I would like to know if one can use the line audio out of any old
>>>> portable shortwave radio tuned to a time signal and fed via a line
>>>> audio input. This would be motherboard audio. The primary reason
>>>> is that I get the impression that ntp radio clocks are for sale at
>>>> very high prices. The most I have to spend is about $200. I
>>>> already have very nice Sony 7600G HF portable and that gets the time
>>>> freq. from 2.5 to 15 very well. My computer is the new pci express
>>>> and I have no serial port.
>>> If you have $200, why not get a GPS 18LVC for about $70 and pay your
>>> local radio hobbyist to install an RS232 plug and a USB poser plug.
>>> That way you wil get microsecond rather than millisecond accuracy.
>> Where are you proposing he plug the RS232 lead in? Buy a PCI/serial card?
> IF he has a serial port there is no problem. Up until a few years ago
> virtually every PC came with at least one serial port. Serial devices
> are not as fashionable as they used to be but it should be possible to
> install a serial port if one is needed.
> An older PC works well as a time server; ntpd might use two or three
> percent of the available processing capacoity.
Uh - I cant think of a motherboard which doesn't have at least one USB
controller integrated into the I/O controller whatever that is. Most Bus
controllers have an embedded USB controller and at least two USB ports
attached to them. They are part of virtually ALL of the low-speed
bus-hubs (i.e. the Southbridge type devices).
and the legacy systems through the ISA bus -
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