You need to take into accout the frequency period over which you need stability. A locked frequency reference used for LF has very different requirements over one used for stabilising moicrowave s
Dear Ken, Wolf, LF Group, I have been playing around with the insides of a Halcyon PFS-1 Droitwich-derived frequency standard over the last few days, and some observations might be of interest. The R
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
I think NPL would have something to say about that if it was really there!. Droitwich is defined as a secondary national standard; the carrier is derived from a rubidium source which is regularly com
Dear James and LF group, I have one of these units but was unable to find out any info on the internet. I figured the DDS section OK and used it to set up the receiver for T/A tests some time ago. I
Actually, for your communication purposes, do you need a stable frequency? If Tx and Rx both lock to BBC Radio 4 or MSF or whatever, it doesn't matter if it drifts. Both amateur Tx and Rx drift toge
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 S
Hi Ken, Martin, and group, I'd say yes... 8970 Hz * 2e-9 = circa 18 µHz resolution, that's fine. Even better than most soundcard's short-term oscillator stability, and the dreadful effects caused by
