[Moon-net] Hypothetical EME Path Question

[Edward R. Cole]

Pat,

I ran your calculations for 1296 MHz with slight changes:
50 dBi antenna (100-foot dish) + 500w 
30 dBi antenna (10-foot dish) + 200w
Both exhibiting 0.3 dB NF, 40K ground noise, 10K sky noise

The small dish hears the larger with S/N = 12.9 dB (certainly good enough
for SSB)
The large dish hears the smaller with S/N = 6.3 dB (not strong but probably
copied)
the larger dish suffers a receive penalty with 69K Moon noise.

I have two eme pathlink calculators (excel spreadsheets) on my web site:
1.  Derived from DF9CY's formula but with three cascaded stages for NF
computation for VHF/UHF.
2.  Microwave eme (1.2-10 GHz) with adjustments for Moon illumination on
noise temp and signal return.

You can find the links for both programs (plus the formula derivations) at:
http://www.qsl.net/al7eb/emeOVROcalc.htm 

73's Ed - KL7UW

At 10:42 PM 8/23/2006 +0200, OK1DFC wrote:
>
>Also F1EHN SW has EME calculator where you can easy calculate level of
>bounced station. See here http://www.f1ehn.org/
>Zdenek - OK1DFC
>JN79GW
>www.ok1dfc.com <http://www.ok1dfc.com>
>QRV EME - 144 - 1296 MHz
>10m DISH - QRO
>
>
>-----Original Message-----
>From: Moon-net-bounces at list-serv.davidv.net
>[mailto:Moon-net-bounces at list-serv.davidv.net]On Behalf Of Stewart Nelson
>Sent: Wednesday, August 23, 2006 9:52 PM
>To: 'Pat Barthelow'; moon-net at list-serv.davidv.net
>Subject: Re: [Moon-net] Hypothetical EME Path Question
>
>
>
>Hi Pat and all,
>
>IMO, if remote station has same power and good NF, ~35 dBi.
>If "reliable" means even with moon at apogee and in fairly
>noisy sky, add ~5 dB.  If you mean it has to work whenever
>you can both see the moon, regardless of local or space
>conditions, I don't think that's possible with amateur gear.
>
>See http://www.df9cy.de/pathloss.htm for examples and free
>calculators.
>
>IMO, a digital voice mode designed for the application
>would permit operation with a few dB less power, as well
>as providing better voice quality (SSB over the EME path
>at 1.2 GHz is badly distorted by libration QSB).  However,
>very few hams seem to be interested in this mode, so it
>is unlikely to be developed any time soon.
>
>73,
>
>Stewart KK7KA
>
>> -----Original Message-----
>> From: Pat Barthelow [mailto:aa6eg at hotmail.com]
>> Sent: Wednesday, August 23, 2006 8:53 AM
>> To: moon-net at list-serv.davidv.net
>> Subject: [Moon-net] Hypothetical EME Path Question
>>
>> Folks:
>>
>> If I had a hypothetical EME antenna with, say, 50db gain at, say, 1.2ghz +
>> -, and the ability to generate at it's feed point, say 1000 watts PEP  of
>> RF
>>   power to do EME in SSB voice mode, what kind of equipment would the
>> other
>> end earth station need to engage a reliable  2 way SSB or other voice
>> mode,
>> qso?   (Type of antenna?   Power?)
>>
>>
>> 73, DX, de Pat AA6EG aa6eg at hotmail.com;
>>                   Skype:  Sparky599
>
>
>
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