[time-nuts] HP 3586A/B/C entirely referenced to 10MHz...
Poul-Henning Kamp
phk at phk.freebsd.dk
Tue Mar 22 16:10:48 UTC 2011
In message <912589.3747.qm at smtp109.sbc.mail.gq1.yahoo.com>, "Burt I. Weiner" wr
ites:
>Within about 5 miles of my home I have two AM broadcast stations I
>work with that are GPS referenced. In spite of being so close to
>these stations it's amazing to watch the phase rock slightly due to
>propagation.
A lot of modern AM transmitters have a envelope tracking powersupply
for the output stage and this often introduce phase-shifts due
to voltage dependent capacitance.
It was quite noticeable when I measured it on the Danish MW 1062kHz
service some years ago.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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