[MAMS] computer clock

[Dr. Gerald N. Johnson]

Comparing my Garmin EtrexH to WWV listening with an FT-857D, the GPS 
seconds change about a quarter second after the WWV click. There is some 
delay in the GPS processor and there can be delay in narrow receiver 
filters and significant delay in a DSP receiver. Some DSP receivers have 
had enough delay they were hard to tune manually. That delay affected 
the receiver audio even on AM. So for timing sake its better to use a 
pure analog WWV receiver with as little filtering as practical. Turning 
off the audio dsp in the 857 and new batteries in the GPS they agree as 
perfectly as I can compare click to digit change.

73, Jerry, K0CQ

On 8/29/2015 4:44 PM, Dave Sublette wrote:
> Problem solved.  Thanks to K9JK who suggested I listen to WWV to see who was right.  Well — how soon we forget old friends!!  WWV used to be the only way to check station clock accuracy.
>
> The answer is —— drum roll please…
>
> The computer clock is close — one and a half seconds slow.  I can live with that for digital mode sequencing.  Thanks for the bandwidth.
>
> Dave, K4TO
> ______________________________________________________________
> MAMS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mams
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MAMS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html