Kerry Kowalski writes in a message to Scott Christensen
KK> Couple more questions for them in the know... (I'm not) How
KK> fast are they movin'???
That depends on how high Mir is.
KK> I've been hearing him from about 11:15 AM to 12:45 PM on different
KK> days for about 15 to 20 min. each B4 he would fade out.
That would mean about a 200 mile high orbit or maybe a bit higher...
KK> And in what direction... I figure west to east! Am I right...
KK> Or maby close??? Like North west to South east??? I'm not a
KK> Ham so I can't ask um... OH pooo...
I presume that Mir is in a roughly circular orbit with some declination to
the equator. Rockets are launched "east" to get the approximate 1000 MPH
boost from the rotation of the earth (at the equator). If you launch from a
more northern or southern position, you get (I believe) the cosine of the
latitude times the equator speed - so you get less "free boost" as you go
away from the equator.
So you are right, west to east would be the apparent direction.
KK> Here is 1 more question... Is he a ham??? By the Call letters
KK> he's usin' He sounds like a pirate! If so is the FCC gonna
KK> bust him when he gets back??? If not I'd like to file a complain't
KK> now! What's the scoop???
I believe he is a Ham - with a special callsign for the station onboard Mir.
So he's not going to be busted. Besides, he is just a little bit out of US
jurisdiction right now. Onboard a Russian sovereign vessel to be precise.
Just like if you were on a cruise ship outside of US waters (or even in US
waters, actually). You would then be a guest of the captain of the boat
extending the hospitality of the country in which the boat is registered.
(You know that ship captains are legally capable of marriages, and most other
functions of heads of state - but only while on their ships, right? You
could even be arrested and detained without warrant if circumstances required
that. So be *very* nice to the captain!)
KK> Ok one more fer good measure... If he was 1800 mi. from me
KK> is he runnin legal power? Or is this a Russian set up and they
KK> have freeer air waves and no limits on power... If so must
KK> be hell watchin' tv in Russia!
You can hear signals as small as 3 watts in the 130 MHz band from synchronous
orbit (23.5K miles) satellites. With a bit of math, presume 3 watts at 130
MHz into a 10dB gain antenna with another 10 dB antenna on the receive end -
from 23,500 miles, we get a receive signal at the receive antenna port of
0.59 microvolts which is *easily* receivable!
Taking your 148 MHz signal from 1800 miles - with the same 10 dB antennas on
both ends and again only 3 watts input, you get 6.80 microvolts. With a
unity gain receive antenna, 2.15 microvolts! (Yes, I have a programmable
calculator that takes the variables and does the math for this problem!
)
KK> Quit laughin'
Ain't "line of sight" wonderful?
--- COUNTERPoint 2.3
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