[amsat-bb] Geostationary & HEO Satellites

[Simon Brown]

Paul,

Unless there's significant latency inside the satellite, I think you're out by a factor of two. Round trip is 2 x 40,000 km (*) = 80,000 km total. Speed of light and radio latency says we're looking at closer to 300 ms.

(*) depending on where you are on the mother planet.

Simon Brown, G4ELI
www.sdr-radio.com 


-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Paul Andrews
Sent: 08 February 2019 19:27
To: Les Rayburn <les at highnoonfilm.com>
Cc: AMSAT BB <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] Geostationary & HEO Satellites

GEOSATs have another interesting characteristic.   600 ms round trip
delay due to the longer distance.

Does anyone remember when MCI first started providing a discounted long distance telephone service?

This will make voice QSOs a little unnatural but certainly not impossible.

73 - Paul - W2HRO





On Fri, Feb 8, 2019 at 12:21 PM Les Rayburn <les at highnoonfilm.com> wrote:
>
> I’m also a newcomer to the birds, but very excited about it. Likewise, I responded to the survey, but wanted to comment further regarding geostationary and HEO satellites.
>
> In the camp of “Both, please.” The HEO birds would once again offer the possibility of DXCC and make WAS more realistic—it also offers more operating challenges.
>
> But a geostationary amateur satellite would have many interesting benefits:
>
> Provide an easier introduction to satellite operation, and attract new operators.
> Excellent tool for emergency communications during a natural disaster.
> Opportunity to experiment with microwave operations.
> The ability to enjoy satellite operation any time of the day/night. The band is always open.
>
> I’m grateful for anyone who incorporates amateur radio into their satellites, but feel that birds should include either linear, digital, or FM transponders whenever possible. Designers are asking a lot of hams when they solicit our monitoring their telemetry signals, and using amateur spectrum for their purposes without much tangible benefit to us. My opinion only.
>
> It’s wonderful that they asked us. Dialogue is the key to most human accomplishment.
>
>
> 73,
>
> Les Rayburn, N1LF
> Maylene, AL
> EM63nf
> AMSAT #38965, ARRL Life Member, CVHS Life Member, SVHF Member
>
>
>
>
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_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
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