Chris, If you are familiar with vacuum tube stuff, I have a basket-case Beckman 905 WWV receiver that you can have for shipping. The radio was discarded because the 6AQ5 coupling capacitor got leaky and caused smoke to be released from the power transformer, which is otherwise OK. It was then sprayed with a fire extinguisher, which ruined the speaker but didn't get past the front panel.
The 905 is a five channel crystal controlled dual conversion receiver. Information is available on the web. It's in a basket because I never got around to repairing it, after taking it apart. Actually, if you have a good communication receiver, you have all you need to set a 10 MHz crystal to 1E-8, if the adjustment has any stability. That's a ten second beat rate. Then you need to filter out the temperature variations, or fool around with NPO caps to compensate for temperature variations. Well maybe 1E-7, which is normal for WWV over the Rockies (sky- wave). Bill Hawkins -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Sunday, November 28, 2010 11:42 PM To: j...@quik.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] If there a FAQ WWV at 10MHz is not bad at all. My current "system" is a cheap $0.75 10Mhz crystal tuned with a screwdriver on a veritable trimmer capacitor. I know I can zero-beat it by ear and get within a couple Hz out of 10MHz. That is better then 1E-6 simply by hand, ear and screwdriver. No computer. The trouble with a 60Khz signal is that a two cycle error gives a 1 in 30K error, I'm just looking to use it as a frequency standard, not caring at all about the data they transmit I figure my first upgrade is to replace the crystal with a temperature compensated oscilator chip. Now to go find one. -- ===== Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.