[amsat-bb] Re: HF Satellite Experiment?

[Joe]

Now, a question,

Is there a difference in which way the signal travels through the 
ionosphere be it going ground up or space craft down,  does it make any 
difference?

And or how about incendense angles? the angle the signal hit the 
ionosphere.  if it's a grazing blow does it get reflected more  vs a 
straight on assault like straight up and down.

It can't be blocked all that much because I remember playing on that 
russian bird all the time Mode "K"?  15/10 meters.

How about listening to Jupiter also?

Joe WB9SBD

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com

On 4/19/2011 3:05 PM, Bob Bruninga wrote:
>> What is your launch date and good luck?
> Launch Opportunity no earlier than March 2012.  Putting us closer and closer
> to the Solar Max which would be the worst time for this experiment.
>
> Bob, Wb4APR
>
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of Bob Bruninga
> Sent: Tuesday, April 19, 2011 12:16 PM
> To: 'John Heath'
> Cc: 'Amsat'
> Subject: [amsat-bb] Re: HF Satellite Experiment?
>
> I'm hoping for 1 Watt and on all the time.
>
> Bob, wbapr
>
>
>
>
>
> From: John Heath [mailto:g7hia at btinternet.com]
> Sent: Tuesday, April 19, 2011 1:14 PM
> To: Bob Bruninga
> Cc: Amsat
> Subject: Re: [amsat-bb] HF Satellite Experiment?
>
>
>
> Hi Bob,
>
>
>
> Congratulations, sounds like an interesting experiment.
>
> I will be listening for the transmissions.
>
> Do you have estimated output power yet?
>
> Will the cubesat TX in eclipse, less active ionoshere.
>
> Will the beacon be on all the time, or intermittent.
>
>
>
> 73 John G7HIA
>
>
>
>    _____
>
> From: Bob Bruninga<bruninga at usna.edu>
> To: amsat-bb at amsat.org
> Sent: Tuesday, 19 April, 2011 14:22:52
> Subject: [amsat-bb] HF Satellite Experiment?
>
> Cubesat HF experiment:
>
>
>
> We have revised our HF satellite experiment proposal to be a CW telemetry
> beacon on 40, 20, 15 and 10 meter bands.  The experiment will last only a
> few days, since the deployed 1000m tether will have so much drag, we will
> de-orbit in only a few days.
>
>
>
> The idea is a keyed CW oscillator on 7.010 MHz with harmonics on 14.020,
> 21.030 and 28.040 MHz.  These bands are all in the IARU Satelilte
> allocation.  We will filter all harmonics above 28 MHz.
>
>
>
> The challenge will be how to feed a 1000m long wire from only a 4"x4"x7"
> counterpoise (on all bands). transformer coupling?
>
>
>
> The tether will be vertical and can act as a long wire antenna with a very
> narrow cone angle pointed straight down.  Antenna gain will be more than 10
> dB on all bands.  This moving donut gain pattern sweeping across the earth
> should pose some interesting reception reports (If any of it gets through
> the ionosphere).
>
>
>
> Launch Opportunity no earlier than March 2012.  Putting us closer and closer
> to the Solar Max which would be the worst time for this experiment.
>
>
>
> Other than a nice AMSAT experiment, if anyone can use this for valid
> ionosphereic science, come join us.
>
>
>
> Bob, WB4APR
>
>
>
>
>
>
>
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