December 2015 - AMSAT-BB - mailman.amsat.org

AO-7
by Gustavo Nicolau 16 Dec '15

16 Dec '15

Hello to all, gud condictions today for NA via AO7. I'm in QRV. 73 de PT9BM.

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Elk Antenna, Midland CT 890 and Full Duplex
by Felix Paez 16 Dec '15

16 Dec '15

Hi all, First of all, thanks for your patience. Still learning! Well, until few days ago I have been able to do many contacts throught SO-50 using my Baofeng UV-5R and Elk antenna in half duplex. I wanted to go next step and try Full Duplex so I bought a Midland CT 890 Full Duplex handy (129 eur). I can tell that the Midland receiver seems much better than the Baofeng one. I have been able to work (still half duplex) even when the satellite was a few degrees over the horizon. The Baofeng seems much deaf than the Midland, but this my subjective experience. The measured sensitivities I got from a review are: 0.179 uV (12 dB SINAD) in VHF and 0.205 uv (12 dB SINAD) in UHF but I don’t have the Baofeng values. If somebody has them It would be nice if you share so we can compare. I have checked that the Full Duplex mode works by transmiting with it and at the same time receiving a signal from the Baofeng UV-5R but all this using the whip antenna that comes with the Midland. The problem comes when I connect the Elk antenna to it. If I press the PTT the receiver noise goes to maximum. I tried to make a contact with the SO-50 but I could not hear anything when I pressed the PTT. All was noise. I had to disable the Full Duplex and then I was able to make some nice contacts (EA1JM, CU2ZG…) in half duplex. So my questions are… 1. Is it possible to use a single Log Periodic antenna (only one feed point) as the Elk to work Full Duplex or two antennas are needed? 2. In case that it is possible… Would this improve by using separate receiver and transmitter with a filter that gives a feed point for VHF and another one for UHF? (the Elk antenna only has a feed point) I have to make more tests but at first time, It does not seem possible to use the Midland CT 890 (and maybe other full duplex handys?) with the Elk antenna in Full Duplex… Thanks. Any comments are always welcome Felix EA4GQS

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Re: [amsat-bb] [amsatindia] Telemetry Signals Heard from from Athenoxat-1
by Nitin Muttin 16 Dec '15

16 Dec '15

Congrats Mani, I could not hear any signals will try next pass 73 Nitin [VU3TYG] From: "'Mani [VU2WMY/KJ6LRS]' wmy(a)isac.gov.in [amsatindia]" <amsatindia(a)yahoogroups.com> To: "BB, AMSAT" <amsat-bb(a)amsat.org>; amsatindia(a)yahoogroups.com; VUHAMS <vuhams(a)yahoogroups.com>; isrohams(a)yahoogroups.com Cc: giulio.manzoni(a)micro-space.org Sent: Wednesday, 16 December 2015 7:54 PM Subject: [amsatindia] Telemetry Signals Heard from from Athenoxat-1 Hello All, Heard strong CW telemetry signals from just launched Athenoxat-1on 437.485 Mhz at 14:09 UTC during its first 22 degrees southern pass over Bangalore, India. But, couldn't decode as it was too fast. Good wishes and greetings from all of us here in India for an early and successful commissioning of all the six satellites from Singapore. 73 deMani [VU2WMY/KJ6LRS] Secretary & Station-In-Charge Upagrah Amateur Radio Club VU2URC ISRO Satellite Centre HAL Airport Road, Bangalore-560 017. Phone:(Office)91-80-25082598/25082054/25082192 Mobile: 91-9880 341 456 E-mail ID: wmy(a)isac.gov.in vu2wmy_mani(a)yahoo.com isrohams(a)yahoo.com Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. 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Telemetry Signals Heard from from Athenoxat-1
by Mani [VU2WMY/KJ6LRS] 16 Dec '15

16 Dec '15

Hello All, Heard strong CW telemetry signals from just launched Athenoxat-1on 437.485 Mhz at 14:09 UTC during its first 22 degrees southern pass over Bangalore, India. But, couldn't decode as it was too fast. Good wishes and greetings from all of us here in India for an early and successful commissioning of all the six satellites from Singapore. 73 de Mani [VU2WMY/KJ6LRS] Secretary & Station-In-Charge Upagrah Amateur Radio Club VU2URC ISRO Satellite Centre HAL Airport Road, Bangalore-560 017. Phone:(Office)91-80-25082598/25082054/25082192 Mobile: 91-9880 341 456 E-mail ID: wmy(a)isac.gov.in vu2wmy_mani(a)yahoo.com isrohams(a)yahoo.com ------------------------------------------------------------------------------ Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. ------------------------------------------------------------------------------

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Re: [amsat-bb] Help needed please
by Aayush Yadav 16 Dec '15

16 Dec '15

Hello all, Currently we are planning to transmit 1 Watt signal from the satellite but due to vswr losses, the transmitted power is around 100 mW. This is due to the antenna's S11 loss being around -1 rather than -10. This is for the VHF band for which we are using an antenna 17 cm long, thus such high loss. The length can not be increased much and so is the case with the electronics(power amplifier) as we are restricted by other constraints. We would love to hear some of your suggestions so as to how can we still increase the transmission power meeting all these requirements. And if not, what can be done on the Ground-Station to improve the reception. Are there satellites available which transmit such low power and still can be received? Any Help would be appreciated. Thanking you, Aayush Yadav Team Pratham. On Mon, Dec 7, 2015 at 9:01 AM, Nitin Muttin <vu3tyg(a)yahoo.co.in> wrote: > Hi Aayush, > > As discussed please consider the below points. > > 1. Fine tune your antennas in the satellite sub band on VHF and UHF. VHF - > 145.800Mhz - 146.000 Mhz. UHF 435-438 Mhz. > > 2. Replace the RG -58 Cable with Heliax or LMR 400 Cable. > > 3. Move the pre amp (LNA) to the mast closer to the antenna. > > 4. Refer http://www.dk3wn.info/satellites.shtml for the list of > satellites , modes and frequencies. > > 5. For some satellites you can use sound card based software TNC like > http://uz7.ho.ua/packetradio.htm for AX25. > > 73 > Nitin [VU3TYG] > > ------------------------------ > *From:* Aayush Yadav <aayushyadav825(a)gmail.com> > *To:* Nitin Muttin <vu3tyg(a)yahoo.co.in> > *Cc:* Mani VU2 WMY <wmy(a)isac.gov.in>; Somashekar S. <vu3jba(a)gmail.com> > *Sent:* Saturday, 5 December 2015 2:27 PM > *Subject:* Re: Help needed please > > Hello sir, > As discussed over the phone, could you please provide me with the various > satellites to track, information regarding softwares and the cables. > Thank you sir, > > Yours sincerely, > Aayush > Team pratham > > > > On Tue, Dec 1, 2015 at 6:28 PM, Nitin Muttin <vu3tyg(a)yahoo.co.in> wrote: > > Hi Aayush, > > Sure, we can discuss on Saturday after 11AM. I can be reached on > 9880018675. > > 73 > Nitin [VU3TYG] > > ------------------------------ > *From:* Aayush Yadav <aayushyadav825(a)gmail.com> > *To:* Nitin Muttin <vu3tyg(a)yahoo.co.in> > *Cc:* Mani VU2 WMY <wmy(a)isac.gov.in>; Somashekar S. <vu3jba(a)gmail.com> > *Sent:* Tuesday, 1 December 2015 3:40 PM > > *Subject:* Re: [amsat-bb] Help needed please > > Hi Nitin, > I was wondering if you were free this week, we would really appreciate the > help. > > Thanking you, > > Regards, > Aayush Yadav > Team Pratham. > > > > On Tue, Nov 24, 2015 at 9:10 PM, Nitin Muttin <vu3tyg(a)yahoo.co.in> wrote: > > Sure Aayush we can discuss this next week over a phone call. This week we > have a tight schedule to the HAMFEST 2015 in Rajkot. > > 73 > Nitin [VU3TYG] > Secretary, AMSAT INDIA > www.amsatindia.org > > ------------------------------ > *From:* Aayush Yadav <aayushyadav825(a)gmail.com> > *To:* Nitin Muttin <vu3tyg(a)yahoo.co.in> > *Sent:* Tuesday, 24 November 2015 7:37 PM > > *Subject:* Re: [amsat-bb] Help needed please > > Hello Nitin, > > We would love to have your help on the same. If you have any advice on how > we should continue our work we really welcome the suggestions. Thanks a lot > for your reply. > If you could help us in improving our sensitivity, as currently we get > around -110 dbm noise at the antenna but as per our calculations the power > of the signal we need to recieve would be of an order of -150 dbm. > > 73 > Aayush Yadav. > Team Pratham. > > > > On Tue, Nov 24, 2015 at 11:40 AM, Nitin Muttin <vu3tyg(a)yahoo.co.in> wrote: > > Thanks Burns for the pointers. > > @Aayush, I can help you with information so that you are able to > successfully receive and decode telemetry. > > 73 > Nitin [VU3TYG] > > ------------------------------ > *From:* Burns Fisher <burns(a)fisher.cc> > *To:* Aayush Yadav <aayushyadav825(a)gmail.com> > *Cc:* "amsat-bb(a)amsat.org" <AMSAT-BB(a)amsat.org> > *Sent:* Tuesday, 24 November 2015 1:28 AM > *Subject:* Re: [amsat-bb] Help needed please > > Hello Aayush, > > Starting out with very strong signals is probably a good idea even though > you can probably get any satellite > that you wish with a good ground station. Start out with AO-85 for FM > reception and AO-73 for SSB > reception. AO-73 is especially strong during local day time during > Mon-Friday (UTC). There is not > transponder turned on then, so all the power goes into the telemetry. > > Both of these can be received with an HT (handheld with a simple antenna) > so you are very likely to receive > them on any station you have and optimize from there. > > I would also suggest that you might find local colleagues in AMSAT-India > who would be able to tell you > things of local interest (what parts are available where, for example). > > 73, > > Burns W2BFJ > > On Mon, Nov 23, 2015 at 2:16 PM, Aayush Yadav <aayushyadav825(a)gmail.com> > wrote: > > > Hello all, > > > > As a part of a student satellite project from India, I have a few > questions > > regarding how can i improve my reception of data on the ground station. > We > > have a TS2000 and have designed a few yagi antennas for uhf and vhf > band. I > > would like to know some satellites on which we can practice receiving any > > signal. We are totally new to this system and have practiced some failed > > attempts of the same. Further, we would really appreciate If anyone could > > help on how we can increase our reception power. Any other help or advice > > would also be appreciated. Thank you. > > > > Aayush Yadav, > > Team Pratham, > > IIT Bombay. > > _______________________________________________ > > Sent via AMSAT-BB(a)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! > > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb > > > > > > _______________________________________________ > Sent via AMSAT-BB(a)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! > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb > > > > > > > > > > > >

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Special Membership Offer for Fox-1A launch on October 8, 2015
by Andrew Glasbrenner 16 Dec '15

16 Dec '15

>From http://www.amsat.org/?p=4591 AMSAT’s Fox-1A is set to launch as part of the GRACE (Government Rideshare Advanced Concepts Experiment) auxillary payload on the NROL-55 mission October 8, 2015 from Vandenburg AFB on an Atlas V vehicle. More details will be released when made available from our launch provider. NRO has released this factsheet about the mission: http://www.amsat.org/wordpress/wp-content/uploads/2015/10/GRACE_CubeSat_Fac… General information on Fox-1A is available in the downloadable AMSAT Fox Operating Guide http://www.amsat.org/wordpress/wp-content/uploads/2015/05/FoxOperatingGuide… FoxTelem software for decoding and submitting telemetry has been made available for download at http://www.amsat.org/?page_id=4532 . As part of the preparations for the launch and activation of this new satellite, AMSAT is making our “Getting Started With The Amateur Satellites” book available for a limited time as a download with any paid new or renewal membership purchased via the AMSAT Store. This offer is only available with purchases completed online, and for only a limited time. A perennial favorite, Getting Started is updated every year with the latest amateur satellite information, and is the premier primer of satellite operation. The 132 page book is presented in PDF format, in full color, and covers all aspects of making your first contacts on a ham radio satellite. Please take advantage of this offer today by visiting the AMSAT store (http://store.amsat.org/catalog/) and selecting any membership option. While there, check out our other items, including the M2 LEOpack antenna system, AMSAT shirts, hats, and other swag. Thank you, and see you soon on Fox-1A! 73, Drew KO4MA AMSAT VP Operations

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Improve Orbital-decay predictions
by Luc Leblanc 15 Dec '15

15 Dec '15

http://www.nasa.gov/press-release/goddard/plunging-into-the-ionosphere-sate… mprove-orbital-decay-predictions Luc Leblanc VE2DWE

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Tim Peake ISS School Contacts Announced
by M5AKA 15 Dec '15

15 Dec '15

ARISS have announced details of the first of the school amateur radio contacts with UK astronaut Tim Peake KG5BVI. Tim will be using the special International Space Station (ISS) call sign GB1SS during his near 6 month mission. http://amsat-uk.org/2015/12/15/tim-peake-iss-school-contacts-announced/ 73 Trevor M5AKA ---- AMSAT-UK http://amsat-uk.org/ Twitter https://twitter.com/AmsatUK Facebook https://facebook.com/AmsatUK YouTube https://youtube.com/AmsatUK ----

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W1Q - FO29 1620z Last Day
by Sean K. 15 Dec '15

15 Dec '15

I'll be on as W1Q on the 1620z pass of FO29. Receive 435.840 MHz. Sean Kutzko Amateur Radio KX9X

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LoTW
by Mike Seguin 15 Dec '15

15 Dec '15

Howdy, I getting the satellite station (AO-40 class) back in shape after being off for quite a while. Made a dozen contacts today on 4 different birds while testing. What logging program are folks using now for satellite that supports LoTW? Mike -- 73, Mike, N1JEZ AMSAT 29,649 "A closed mouth gathers no feet"

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