Ignacio is right. Even using a TCXO, the closest I have been able to achieve is around 1 to 3 Hz at 15 MHz. The TCXO is actually a VTXCO, as it is voltage adjustable with a good quality ceramic-metallic trimpot.
I propose the following exercise: Get Spectran 216, get used to it and then display the WWV carrier converted to 1 kHz, with a 50 Hz or so bandwidth and watch how the carrier dances. Quite often, you will see not only one single carrie displayed, but quite a few, as every received path (1F, 2F, etc) has different refraction points in the ionosphere and in east-west paths like the one from Boulder to Havana, depending on the time one point is rising while others may be static or descending, which "decomposes" the single carrier into a combo of threads each suffering different degrees of Doppler and fadng. The spread is AT LEAST 1 Hz, and I have seen more. 73, Jose, CO2JA --- EB4APL escribió: > Chris, > > Regarding the 0.1 Hz or better resolution you will have to face 2 > problems at least: > (snip) __________ Information from ESET NOD32 Antivirus, version of virus signature database 3890 (20090226) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com Participe en Universidad 2010, del 8 al 12 de febrero de 2010 La Habana, Cuba http://www.universidad2010.cu --------------------------------------------------------------------- SEGUNDO SEMINARIO INTERNACIONAL LEGADO Y DIVERSIDAD. ARQUITECTURA Y URBANISMO. El rescate de los valores urbanos y arquitectónicos en tiempos de globalización Colegio de San Gerónimo, La Habana Vieja, noviembre 24-27, 2009 ---------------------------------------------------------------------
