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To the Moon and back on 2093 Mhz ! |
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To the Moon and back on 2093 Mhz ! |
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Although these signals are extremely strong, only two stations (VE4MA and K3PGP) have reported hearing these signals. The most difficult problem seems to be getting something to tune down to 2093 Mhz as the 'ham' band starts at 2300 Mhz with most weak signal work at 2304 Mhz or above.
The following recordings were provided by Barry, (VE4MA) the first station to report hearing the uplink signal to the Lunar Prospector via EME.
EME stands for Earth-Moon-Earth, the path taken by these radio signals.
These command signals were transmitted from a NASA ground station to the Lunar Prospector. However, those radio signals continued on past the Lunar Prospector and then hit the surface of the moon. What you are hearing when listening to the recordings below are the command radio signals hitting the surface of the moon and being reflected back to earth! The round trip takes approx. 2.5 seconds.
The rapid fading on these signals is called 'Libration' fading and is caused by the rough surface of the moon. As parts of the radio signal arrive back on earth some parts are in phase and others are out of phase resulting in the addition and subtraction of the signal level. The rapid fading results in a signal that sounds like it's fluttering or wavering.
The Main Uplink Carrier 2093.0541 mhz (Approx. 232 k)
The Subcarrier (Where the data is!) +/- 511 khz (Approx. 355 k)
| From: ve4ma@escape.ca To: k3pgp Date: Wed, 11 Mar 1998 20:12:50 -0600 (CST) Subject: 2093 MHz Uplink |
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| 10 foot Dish at VE4MA | Feedhorn, Preamp, TR Relay, etc. |
Hi John
It's there!!!!
I looked it up and I hear it
about the same strength as the downlink. Lots of flutter
(libration) which is normal for the frequency. It is exactly on
frequency as advertised. I did not calibrate my frequency and I
read the carrier as 2093.054.5 with +3.4 KHZ doppler at the time.
There is a subcarrier at +/- 511 KHz (2093.566 MHz). There is
occasionally some slow speed data heard which causes the
subcarrier to move somewhat. I will try to get a Wave File later.
| Best 73 Best 73 & Tnx Barry VE4MA ve4ma@escape.ca |
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