Re: LF: VLF Transmissions from Spacecraft

[David Bowman <davidg0mrf@gmail.com>]

Hi Jim

Very interesting orbit.  I think that is in the 'gap' between the lower and upper radiation belts.

I think AMSAT would give their right arms to have a satellite there. Will be interesting to see how benign that area of space works out to be.

73

David    AMSAT-UK

On Tue, Feb 6, 2018 at 6:31 AM, <hvanesce@comcast.net> wrote:

Falcon Heavy “50/50 chance” launch today (1730 UT), without DSX. DSX (WPIx) is now on the third Heavy flight, which might be in June if the preferred “50” prevails today. If not, maybe Stefan, Markus, Joe, Riccardo or Tom will come up with something.  

 

Jim AA5BW  

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of hvanesce@comcast.net
Sent: Monday, June 5, 2017 1:28 AM
To: rsgb_lf_group@blacksheep.org
Subject: RE: LF: VLF Transmissions from Spacecraft

 

Correction: 12000km/6000km elliptical retrograde orbit

 

Also agree 500W could be pulse ERP

 

 

From: hvanesce@comcast.net [mailto:hvanesce@comcast.net]
Sent: Monday, June 5, 2017 1:15 AM
To: 'rsgb_lf_group@blacksheep.org'
Subject: RE: LF: VLF Transmissions from Spacecraft

 

Unofficial r/SpaceX page https://www.reddit.com/r/spacex/wiki/launches/manifest now shows December 2017; last update to the manifest was May 8; looks dependent on F9 Heavy demo launch scheduled for summer.

 

Many delays since 2008 (for DSX) due to low priority and special (9000km/6000km elliptical retrograde) orbit.

 

Some web references show operational life as 6 months with goal of 12 months (radiation as one possible limit).

 

From link below (in prior messages):

Cross-dipole antenna is 80m tip-to-tip (Y) and 16m tip-to-tip (Z):  X,Y for receive;  Y for transmit

Two TX modes: whistler (3-50 kHz, 500-900W) and boomerang (50-750 kHz, 1 W)]; real-time tuning/matching

Dipole receiver sensitivity:  0.01uV/rt-Hz RX

Separate 3-axis-loop receiver sensitivity: 3fT/rt-Hz

 

Guessing 500W is specified at the battery.

 

Jim AA5BW      

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Claudio Pozzi
Sent: Thursday, May 18, 2017 5:23 PM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: VLF Transmissions from Spacecraft

 

On Thursday 18 May 2017 19:45:51 you wrote:

> FYI:

>

> The "DSX" satellite will carry a 0.5-0.9 kw, 3 to 50 kHz (pulsed?) VLF

> transmitter.

>

> Citation from: www.dtic.mil/dtic/tr/fulltext/u2/a531813.pdf :

>

> "...and a two week high-power VLF transmission campaign will occur near the

> end of the mission." End of life is planned at 12 months after launch and

> "Early Operations".

>

> As far as I understand the tx-antenna will be a 2x40m dipole.

>

> Launch is scheduled for 2017-xx-xx (Falcon Heavy launch vehicle).

>

> 73 de df3lp,

> Peter

 

Interesting mission.

 

https://directory.eoportal.org/web/eoportal/satellite-missions/d/dsx

 

Here some details about the spacecraft transmission.

 

http://smartech.gatech.edu/bitstream/1853/8037/2/SSEC_SD1_doc.pdf

 

TNX

 

Claudio ik2pii

 

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