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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: Frequency Stability |
| From: | "Alan Melia" <[email protected]> |
| Date: | Fri, 18 Mar 2011 21:18:22 -0000 |
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Hi Ken The problem might be if you are deriving the frequency direct from R4 via a PLL you will have severe problems if/when the PLL unlocks due to noise or fading. The best bet is to run a loop on SpectrumLab and watch the drift rate .....OK you will actually be seeing the soundcard drift but you will notice if the PLL becomes unlocked. I find that I get periods on a Halcyon off-air standard where the noise spoils the lock and the output thrashes around. You may get a more reliable signal than I do. I use a good ovened crystal which is manually adjusted to R4 frequency. Alan G3NYK ----- Original Message ----- From: "Ken" <[email protected]> To: <[email protected]> Sent: Friday, March 18, 2011 7:54 PM Subject: LF: Frequency Stability To All VLF. Is the following frequency stability sufficient for Spectrum Lab: 1MHz and 10MHz derived from Radio 4 198 kHz Accuracy 2 parts in10-8 over 1 sec,2 parts in10-9 over 10secs. 73s Ken M0KHW IO91TV |
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