Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v555WeJa025402 for ; Mon, 5 Jun 2017 07:32:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dHkZ1-0002Dj-Mz for rs_out_1@blacksheep.org; Mon, 05 Jun 2017 06:28:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dHkZ1-0002Da-3s for rsgb_lf_group@blacksheep.org; Mon, 05 Jun 2017 06:28:27 +0100 Received: from resqmta-ch2-11v.sys.comcast.net ([2001:558:fe21:29:69:252:207:43]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dHkYw-0002Ec-F8 for rsgb_lf_group@blacksheep.org; Mon, 05 Jun 2017 06:28:25 +0100 Received: from resomta-ch2-17v.sys.comcast.net ([69.252.207.113]) by resqmta-ch2-11v.sys.comcast.net with SMTP id HkYtdpKiTT4XXHkYtdLnf1; Mon, 05 Jun 2017 05:28:19 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1496640499; bh=ZT0vXCV0rwPpgbtbR63mjsy0ohCbUdw/Y+xxUSGqOqw=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=Vc0xvxWdCAkyAnO9TdqK6QIEcVbpckinbLvKu+6UrC01gRwEo5gCTonZQj7o2PSmc huPk0/XeltbM4I7Bhl7uEq6OuUqjkrTiEdEwVyZffnoQRPp/uOgguEI//rglUQ9U96 UY7/AMdyZWEiV2MxI/mrP56sa3Oo+KbkhC4wzxYFc9itFLTpLag8g015jyctIv/PCm bKGtvnwrssT3c1IMezC+RrA2zvnCqVLyb5nGTMwy4ZEBoAkNbSbStqsq1q6zHxFBd2 FvpuLB/L5J1hjRe1/rwsViIRzV94dFuXxs9TtOrP2uUcYJ9Ch5Zhid1k3cGP9yGCm6 XI2DottSp0I+w== Received: from Owner ([IPv6:2601:140:8500:7f9f:ec2c:3522:b433:4166]) by resomta-ch2-17v.sys.comcast.net with SMTP id HkYrd4mosbkqIHkYsdKfwp; Mon, 05 Jun 2017 05:28:19 +0000 From: To: References: <07558728-336b-cb7c-bc04-4d7718f5b97c@df3lp.de> <1960259.EQv1FmN41F@x220> In-Reply-To: Date: Mon, 5 Jun 2017 01:28:16 -0400 Message-ID: <037701d2ddbc$89dbcfc0$9d936f40$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJG7D3e+r5e3mKohe8NQhCsSzouGgEI4nx+oSVG4SCAABHdYA== Content-Language: en-us X-CMAE-Envelope: MS4wfCZZaocyiQaXjV3aZuui0fY7z+aB2C17TKjM6barAdJtymEiJiI5GnA9Hf2KPsUJY2Pu5kA8+i7w4wcokI0YKRMWfg72Tdi3GovCelooOa3a+GZ2eGKa 9RT7XqZEzDBX9kBNNQWf0ylPWthv9jRRxm8= X-Scan-Signature: 1071da3933cc71afd2b8c5f341fb2b80 Subject: RE: LF: VLF Transmissions from Spacecraft Content-Type: multipart/alternative; boundary="----=_NextPart_000_0378_01D2DD9B.02CA2FC0" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11894 This is a multipart message in MIME format. ------=_NextPart_000_0378_01D2DD9B.02CA2FC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 ---- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli clicca qui Sponsor: Caselle con tuo dominio su piattaforma Zimbra, fino a 30 GB di spazio, sincronizzazione dati e backup Clicca qui ------=_NextPart_000_0378_01D2DD9B.02CA2FC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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://w= ww.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@bl= acksheep.org [mailto:owner-rsgb_lf_g= roup@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/satel= lite-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

 

----
ZE-= Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per = tutti i dettagli clicca = qui

Sponsor:
Caselle con tuo dominio su piattaforma = Zimbra, fino a 30 GB di spazio, sincronizzazione dati e backup
Clicca qui

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