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AO-51 in mode V/S ?
by Dave G1OCN 28 Aug '06

28 Aug '06

Nope, not the last pass at 2110 UTC either. Cheers, Dave.

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AO-51 V/S
by Dave G1OCN 28 Aug '06

28 Aug '06

Is this mode active as of today ? Nothing heard during the last path over the U.K. from 1921 to 1935. Listening for the next one... Dave. IO80SM Dorset. U.K.

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Fwd: Re: Re: IARU Region 1 - Increased Amateur Sat 2 Metre Usage
by Edward R. Cole 28 Aug '06

28 Aug '06

I meant to type 144.100-144.170 MHz is digital EME. >Date: Mon, 28 Aug 2006 04:55:14 -0800 >To: Fabio Roccatagliata <roccaf(a)gmail.com>, i8cvs <domenico.i8cvs(a)tin.it> >From: "Edward R. Cole" <al7eb(a)acsalaska.net> >Subject: Re: [amsat-bb] Re: IARU Region 1 - Increased Amateur Sat 2 Metre Usage >Cc: AMSAT BB <amsat-bb(a)amsat.org> > >Not True! CW 2m-EME is 144.020-144.100, and digital EME is 144.100-144.700. Digital EME refers to the mode JT65 designed by W1JT which began about 2003 with JT44 (its predecessor). > >The area below 144.020 is filled with birdies nearly world-wide and useless for any "weak-signal" operation Including satellite. Just because one may not hear much local activity on those frequencies does not mean that they are not occupied by eme signals. One can point a single 22 element satellite x-yagi at the Moon and with 100-200w operate digital eme these days. The signal from such a small station are not audible but the powerful JT65 sw can dig them out of the noise. I have over 70 contacts on eme with 125w at my antenna terminals, yet you would not hear my signal if over 100 miles away from me if merely listening by ear (I would detect your 10w signal even pointing above the horizon). > >In Europe, I understand that 144-144.100 is used for terrestrial DX (tropo, ms, FAI and auroral propagation). You will not find the "weak signal" CW community willing to lose the last suband that they have (100 KHz out of 2 MHz). Satellite has 145.800-146 MHz at present. If 144.300 subband has been occupied by other modes it is due to inactivity by satellite. I would guess there is no spectrum available for satellite to move on the 2m band. > >73's Ed - KL7UW > >At 01:42 PM 8/28/2006 +0200, Fabio Roccatagliata wrote: >> >>I know the 144.000/144.035 is world-wide assigned to EME but actually >>all the EME contacts are almost made from 144.100 and above. >>Doing a research on the cluster there are no EME contacts on the segment I said. >>The newsletter proposed to use the segment 144.315-144.365 for sat >>uplink that, in my opinion, I think is more used. >> >>In any case, since the bandplan covers all the 144-146Mhz segment, I >>suppose something has to be moved away if a sat reassignation >>frequencies has to be made so the question is: Which segment is more >>suitable for that ? >> >>73 >>Fabio >>IZ1EGT/F5VKV >> >>> Hi Fabio, IZ1EGT >>> >>> Unfortunately I cannot open the page >>> >>> > http://www.iaru-r1.org/Newsletter_43a.pdf >>> >>> Glad if you or Trevor can send to me the above 43a.pdf file as an >>> attachement. >>> >>> Anyway according to the actual 144-146 MHz Bandplan IARU Region-1 >>> the segment 144.000 to 144.035 MHz that you propose is used world-wide >>> for 2 meters EME (SSB & Telegraphy )...........WOW ! ! >>> >>> 73" de >>> >>> i8CVS Domenico >>> >>_______________________________________________ >>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 >> 73's, Ed - KL7UW ========================================= http://www.qsl.net/al7eb - BP40iq 144-EME: FT-847, mgf-1801/1402, 4xM2-xpol-20, 170w 432-EME: FT-847, mgf-1402, 1x21-ele (18.6 dBi), 60w =========================================

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echo
by McGrane 28 Aug '06

28 Aug '06

I should explain my setup here; FT8800 dual band FM rig for recieve 8 element yagi with mast mounted 18 db hamtronics preamp 25 feet of 9913 coax I use narrow fm mode for maximum sensitivity. Whoever claims that leaves on trees attenuates UHF is correct but taking this into account I base my observations on clear path passes. I liked bruningas idea of reduced duty cycle or on time of the downlink. My experience with so-50 is that people would adapt to it quickly. A good way to save energy. One shouldnt correllate transmitter current draw with solar panel output current as the transmitters are not on for the entire orbit. This brings me back to the battery issue: How many cycles are the batteries expected to deliver versus depth of discharge? Is this information available on the web? Thanks, pat

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Re: front-end overload was: echo
by Ronald Long 27 Aug '06

27 Aug '06

A bandpass filter may help. Here is one from MFJ for 2 meters. http://www.mfjenterprises.com/products.php?prodid=MFJ-713 The above has BNC connectors, the MFJ-714 has SO-239 connectors. ron w8gus

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Tire Pressure Monitoring
by Trevor 27 Aug '06

27 Aug '06

These reports from KARL provide some additional info on Tire Pressure Monitoring and Remote Ket access on 433.92 in Korea. http://www.jarl.or.jp/iaru-r3/13r3c/docs/036.doc http://www.jarl.or.jp/iaru-r3/13r3c/docs/034.doc 73 Trevor M5AKA ___________________________________________________________ Now you can scan emails quickly with a reading pane. Get the new Yahoo! Mail. http://uk.docs.yahoo.com/nowyoucan.html

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KiwiSat Paper
by Trevor 27 Aug '06

27 Aug '06

A paper on KiwiSat submitted to the IARU Region 3 Conference can be seen at http://www.jarl.or.jp/iaru-r3/13r3c/docs/050.doc Region 3 Docs http://www.jarl.or.jp/iaru-r3/13r3c/docs/docs.htm 73 Trevor M5AKA ___________________________________________________________ All new Yahoo! Mail "The new Interface is stunning in its simplicity and ease of use." - PC Magazine http://uk.docs.yahoo.com/nowyoucan.html

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info
by w3vvp 27 Aug '06

27 Aug '06

I have received the keps from Ray for quite a while. Did I miss a message in regards to the keps as I have not received them for the last 2 weeks. I was getting them on Friday evening. Thanks for any info. George,W3VVP

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Re: front-end overload was: echo
by Pughkeithd＠cs.com 27 Aug '06

27 Aug '06

Amen, Andy! Excellent explaination. I can't use my Yaesu VX-5R HT with an Arrow attached in a metropolotin area for the very reasons you describe. It works fine with a long "Rubber Duck" but with all of the aluminum in the Arrow attached it becomes very deaf due to front end overload. 73 - Keith, W5IU

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Re: echo
by G0MRF＠aol.com 26 Aug '06

26 Aug '06

In a message dated 26/08/2006 16:33:29 GMT Standard Time, tmcgrane(a)suffolk.lib.ny.us writes: Thanks for the info drew and bob, with at least 18 watts from the solar panels and maybe 6 watts being consumed by the satellite, I believe there must be a way to recoup all that solar power. Thanks to anybody who can eek out more power in the future. Can amsat afford to consult with the original satellite manufacturer in virginia on the subject? BTW, I have bothe the original and current ECHO books. Thanks, pat n2oeq Hi Pat. The answer would seem to be: Echo works very well at it's current power setting requiring only modest equipment to use the onboard systems. To receive the satellite down to the horizon on every pass could be done by increasing the power towards its maximum of 4 Watts. However, the penalty would be to limit the other functions available to users and increase the depth of discharge of the batteries during each eclipse period. The effect of this would be to shortern the life of the batteries and the satellite. All of the above gleaned from messages and material referenced in the past few days. We don't need to ask Spacequest anything, we just need to improve our ground stations to cope with the power that is deemed optimum for maximum satellite lifespan. 73 David G0MIN AMSAT 51 on 51 award No fortysomething. "Ask not what your country can do for you - ask what you can do for your country" -JFK 20th Jan 1961

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