[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Radio Propagation

Original poster: "Doug Forbes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <av599-at-lafn-dot-org>

Many local radio stations reduce their power output at sundown. Perhaps that
is the effect you are experiencing as propagation on the lower frequencies
doesn't generally chage that abruptly at sundown.

Doug Forbes

> > I have 4 old AM tube radios.  The stations come in fine during the day
> > just after the sun sets and just before it rises the radio stations
> > considerably.
> Nought to do with 'induction variation'.
> Basic propagation variation as the ionosphere
> settles down for the night.  cf any text on propagation.
> for a verification, find a synthesized am/bcb radio
> (car radio may be easiest....).  Fading will be the same,
> allowing for the differnce in the sensitivity of the
> receivers.
> And there is a Whole Gropup of people who monitor
> ELF/VLF (RF in the audio region.  They hang out
> on different mail lists.)
> BTW:
> Middle of the geomagnetic storm.  BBC via SW just fine,
> with no retuning on the LC tuned receiver.
> Semi Unrelated:
> Official NASA Aurora alert for tonight (Thu) & tomorrow.
> best
> dwp