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R4h.HqK1oFH0ecE9rn4i1AzDMArWYJ6Pffl.a4zQPuGKCW0.z1GiiXF9zcpV 0bZChjEyLu2mcXxQMvEtJIkYO X-Yahoo-Newman-Property: ymail-3 Message-ID: <004301cbe5b3$413dd8b0$4001a8c0@lark> From: "Alan Melia" To: References: Date: Fri, 18 Mar 2011 21:18:22 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.2001 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.2001 X-Antivirus: avast! (VPS 110318-0, 18/03/2011), Outbound message X-Antivirus-Status: Clean DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: LF: Re: Frequency Stability Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d287.1 ; domain : btinternet.com DKIM : fail x-aol-sid: 3039ac1db40a4d83ce676c4b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : temperror 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" To: 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