January 2009 - AMSAT-BB - mailman.amsat.org

Re: wisp tnc3s
by nader omer 21 Jan '09

21 Jan '09

HI Pedro Cruz Chech this link http://www.ne.jp/asahi/hamradio/je9pel/index.htm 73's de Nader , st2nh www.st2nh.com

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preamp relay question
by corner5 21 Jan '09

21 Jan '09

hi all, January 21, 2009 I am assembling my first satellite station and have a question about the preamp bypass relays. Background: > The rig is the TS2000 and I want the flexibility to use the full RF range for 2m (100w) and 70cm (50w). No RF out amp at this time. I realize I may never need the upper RF power limits, but I wanted to build in the option from the start. > I have a modest antenna system with a pair of omni's each on their own coax feed. Each will have its own mast mount preamp. > The rig is capable of inserting a sequencing Tx delay. > The preamp bypass relays I have on hand are: AXICOM D2n (V23105-A5003-A201), 12vdc coil. I needed and found a relay with a low coil current (13mA) to be within the rigs trigger abilities (20mA max). So far so good. >> The relays specs. state: "switching and continuous current = 3A" and "maximum switching capacity = 60w, 125VA". The question(s): Q1... Does this stated 60w power limit for the contacts also imply a 60w limit for the RF level I wish to run through it? Again, the rig limits out at 50w on 70cm so this is not the issue, but it (the rig) can go to 100w on 2m. In other words, I am unclear how the power limits of the contacts may or may not change as one goes from DC to 60Hz to 144 MHz to 440 MHz? Q2... I have been reading about relays that are specifically designed to handle RF, yet I see many operators that seem to use more "generic" relays for this purpose. What is the requirement here with respect to frequency? This station is not intended to go to GHz. In conclusion: _Is the above sited relay suited for this purpose?_ Are there constraints or design considerations? If the answer is "nope, wont work", then what (and who) offers a not very expensive solution? I really would like to stay under my rig's 20mA limit for the coil current (and therefore maintain the sequencing ability). And as a final comment, the general consensus seems to be to go with a hardwired relay system and avoid the RF switched types. This last is why I am pursuing this path. thanks for the advice! ac0z, .paul

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Japanese New satellites info
by Masahiro Arai 21 Jan '09

21 Jan '09

Five Japanese satellites will be launched by H-IIA F15 at 23rd Jan. Launch window is 03:54-04:16z. Here is the latest info about the new satelltes. 1. keps Pre-launched keps is not release. Keps will be release in 30min or later after launch. PRISM team announces the keps will show on their blog site ASAP. http://prismblog365.blog14.fc2.com/ PRISM team announces first day's estimated pass time at Tokyo as followings. time hour:min T+01:39 T+09:23 T+10:56 T+12:34 STARS team also announces windows at Kagawa. time AZ max EL T+ 01:39-01:49 343-247 8.9 T+ 10:56-11:08 147-357 72.6 T+ 12:33-12:44 205-326 15.2 Please estimate windows using above info and launch sequence from JAXA until keps release. http://www.jaxa.jp/countdown/f15/overview/sequence_e.html South American and North American stations will hear the very first new babys voice. 2. Launc live show The JAXA will broadcast launch live show via internet. http://www.jaxa.jp/countdown/f15/live/index_e.html Launch time is inportant for chasing satelltes. 3. initial status and latest info (1) Kagayaki 9600bps packet or CW(FM) on 437.375MHz. (2) STARS CW transmission will be started 200sec after separation. Mother satellite: CW 437.305MHz Daughter satellite: CW 437.275MHz English web site. http://stars1.eng.kagawa-u.ac.jp/english/index.html (3) KKS-1 CW transmission will be started after separation. CW at 437.385MHz. English web site is now open. http://www.kouku-k.ac.jp/~kks-1/kks-gs-top-e.htm (4) PRISM CW beacon transmission will be started 200sec after separation. CW at 437.250MHz. Excel sheet for CW beacon analisys is on http://www.space.t.u-tokyo.ac.jp/gs/en/application.html English web site. http://www.space.t.u-tokyo.ac.jp/prism/main-e.html Japnase/English blog site is now open. http://prismblog365.blog14.fc2.com/ (5) SOHLA-1 No operation on amateur band. Initial operaion is on S band. The frequency is not open. Amateur band operation will be start around middle of Feb or later. Who will catch the first signal? Please try and report. Happy chasing! Masa JN1GKZ

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TS2000 ext TNC 9k6 hints
by Henk, PA3GUO 21 Jan '09

21 Jan '09

Pedro, What about these: menu 50F: 9600 TNC connection: via ACC2 pin 3 (not via loudspeaker) (ACC2 pin 1 is SUB transceiver) Henk, PA3GUO (uses TS2000X with ext PK96 TNC via ACC2)

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springtime project
by w7lrd＠comcast.net 21 Jan '09

21 Jan '09

Hello Before I reinvent the wheel I want to run this project by you. My current satellite antenna system is on a 15 foot tripod using a G5400 az/el rotors. Consists of 14 el cp 2M yagi, 40 el cp 70 cm yagi, 3 foot dish for S band 16 turn helix for L band. I want to change the tripod to a 30 foot tower and add a 5 el 6 M beam. Question- put the satellite antennas just above the top of tower and the 6M beam above the satellite ants. high enough as not to interfere with the sat. antennas when rotated in elevation. Then if possible have the whole thing being able to tip over. Has anyone come close to doing something like this? Or any ideas. 73 Bob W7LRD CN87 -- "if this were easy, everyone would be doing it"

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ts2000 external tnc
by Pedro Cruz 21 Jan '09

21 Jan '09

HI Walter Yes i change 50E to Main but nothing. tnx Best 73 ! Pedro Cruz - cu2jx ----- Original Message ----- From: "Walter Holmes" <walterh(a)k5wh.net> To: "'Pedro Cruz'" <pccu2jx(a)sapo.pt> Sent: Wednesday, January 21, 2009 2:28 AM Subject: RE: [amsat-bb] ts2000 external tnc How about Menu 50E ? Did that get changed to Main ? Walter/K5WH ... -----Original Message----- From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On Behalf Of Pedro Cruz Sent: Tuesday, January 20, 2009 9:10 PM To: amsat-bb(a)amsat.org Subject: [amsat-bb] ts2000 external tnc Hi Walter and all Tnx for responce But o forgot to say the external tnc . With external tnc i can not receved packet´s in main receiver . But in the sub it work very nice . Any ideas? Best 73 ! _______________________________________________ Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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ts2000 external tnc
by Pedro Cruz 21 Jan '09

21 Jan '09

Hi Walter and all Tnx for responce But o forgot to say the external tnc . With external tnc i can not receved packet´s in main receiver . But in the sub it work very nice . Any ideas? Best 73 !

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ts2000 9k6
by Pedro Cruz 21 Jan '09

21 Jan '09

Hi to all I have a Kenwood ts2000 but i can not reveive 1k2 or 9k6 bauds in the main receiver i tried all configurations from the manual with no sucess (in sub receiver it works ok). So in this case how can i work digital sat´s? Any one have this problem or it´s like this ? Best 73 ! Pedro Cruz - cu2jx

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Re: AO51 L/U 96k BBS
by G0MRF＠aol.com 20 Jan '09

20 Jan '09

In a message dated 20/01/2009 06:24:59 GMT Standard Time, samudra.haque(a)gmail.com writes: I have just finished studying AO-51 systems in detail, and want to move on from voice comm to digital modes. For 96 kbps, is there any I assume this talk from several people of a 96k BBS started as a typo and has taken on a life of its own. You mean 9k6 right? David

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Re: ISS frequencies - Additional Note
by David Barber 20 Jan '09

20 Jan '09

Further to previous posting. Forgot to add 145.800MHZ downlink appears to be in high power mode. David G8OQW

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