Message-ID: <20090327162720.6et0xg2farr40g0c@webmail4.kuleuven.be>
Date: Fri, 27 Mar 2009 16:27:20 +0100
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: rsgb_lf_group@blacksheep.org
References: <E1Lmt6x-0006qT-De@www9.emo.freenet-rz.de>
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Subject: Re: LF: Lazy Man's CW made it to Venus and back
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Dave,

If I got it right their ran 5kW into a 20m dish at 2.4GHz.
The dish gain should be about 50dBd.
50dB =3D 100000 times power gain, thus ERP =3D +/- 500MW
The distance to Venus (today) is 0.281 AU =3D 42 milion km =3D 26.1 milion m=
iles
Total distance is 82 milion km / 52.2 milion miles, what makes it +/- =20
0.1 miles per Watt.
That value is not spectacular at all, but take into account that Venus =20
is a pretty bad reflector and the signal hasto go twice trough the =20
atmoshpere and ionospere.

73, Rik  ON7YD

Quoting Dave Pick <daveyxm@googlemail.com>:

> How many miles per Watt is that?!!
>
> Dave 'YXM
>
> 2009/3/26 <dl4yhf@freenet.de>
>
>> Greetings everyone,
>>
>> Not really LF, but QRSS...
>>
>> A group of radio amateurs from AMSAT-DL has successfully transmitted a
>> (very short) message in QRSS, consisting of the two letters "HI" (im
>> memoriam of old OSCARS) to Venus on 2.4 GHz, and received the reflection.
>> Each TX/RX over lasted for about 5 minutes (the travelling time). The
>> transmitter was a 5 kW magnetron disciplined to a narrow-band transmitter=
.
>> Details on the AMSAT-DL website. The German HR TV will send a documentati=
on
>> tonight at 19:30 (local). The EVE (Earth-Venus-Earth) details follow
>> tomorrow on Hessischer Rundfunk.
>>
>> 73,
>>  Wolf DL4YHF
>>  (from the IUZ in Bochum)
>>
>>
>>
>>
>>
>> #adBox3 {display:none;}
>>
>>
>>
>
>
> --
> G3YXM IO92BK Birmingham UK
>



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