[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:
>>>> Hello.
>>>> 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?
>> David
> 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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