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1-7 of 7 messages
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70cm satellites
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by KI4YMD on January 20, 2008
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I'm using www.heavens-above.com to track 70cm FM satellites that I might can listen too via my HT.
I've noticed that KO-23 has a frequency of 435.175 FM. How does that work? Do I transmit on that frequency and it stores and repeats on the same frequency?
Another thing I noticed that many HTs only transmit on 440-450. Like the IC-T7H. Is there a reason they do not include the full 70cm band on those radios? I have a radio that is capable of working on 435. My goal is to get good at tracking and listening before I work on talking.
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RE: 70cm satellites
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by KG4RUL on January 20, 2008
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KO-23 was a Packet Satellite (PACSAT) that Uplinked on 145.900 MHz FM (9600-baud FSK) and Downlinked on 435.170 MHz FM (9600-baud FSK). This satellite is currently non-operational.
Currently operational satellites include:
AO-27 - FM Voice Repeater
GO-32 - APRS & PACSAT
SO-50 - FM Voice Repeater
AO-51 - FM Voice Repeater & PACSAT
VO-52 - Linear Transponder
AO-7 - Linear Transponder (semi-operational)
Refer to the AMSAT status page for further details: http://www.amsat.org/amsat-new/satellites/status.php
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RE: 70cm satellites
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by K5LXP on January 20, 2008
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You're going to need a yagi too, the FM sats are difficult copy on an HT's flexible antenna. I found AO-51 to be copyable with just 3 elements, going to 7 made it slightly better.
Mark K5LXP
Albuquerque, NM
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RE: 70cm satellites
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by KB9CRY on January 21, 2008
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Sounds like you need to do a little more homework on satellite basics. There's some excellent articles on the AMSAT website.
HTs are designed for use either line of sight to other HTs or with local repeaters. They are not designed to be fully functional radios.
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RE: 70cm satellites
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by WD9EWK on January 22, 2008
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Hi!
Many older 70cm FM radios sold in North America were designed to only transmit on the 70cm FM repeater/simplex subband (440-450 MHz, or in the case of Kenwood 438-450 MHz), with no regard for someone traveling to other parts of the world where FM activity would be in 430-440 MHz. Some radios also limit the 70cm receive to 440-450 MHz or 438-450 MHz without modification, again in keeping with where FM is used in North America and ignoring the rest of the world and maybe even ignoring any expanded receive capabilities almost any current 70cm FM radio has.
The IC-T7H *does* transmit in the 430-440 MHz range, although the IC-W32A favored by many for FM satellite work does not and requires a modification to transmit there (not necessary for working AO-51, SO-50, or AO-27, but needed if the ISS cross-band repeater is ever on). There are usually modifications to expand the 70cm range on most radios, either the "MARS/CAP" mods or - like with the IC-W32A - a modification that enables transmitting anywhere the radio functions on the 2m or 70cm bands.
Working on your receive setup before transmitting is great advice to follow. Once you can hear the satellites, you will be able to get a transmit setup going quickly. For the FM birds, it doesn't take much to be heard up there - the satellites have good receivers.
As for the other comment about HTs not being designed to be "fully functional radios"... ??? For their intended purpose, they are fully functional. Satellite operation is generally never a consideration when these radios are designed by the manufacturers. Most VHF/UHF FM-only radios were never intended for satellite work, but some radios like the FT-817 actually provide instructions on how to program memory channels for working FM satellites.
It's a shame that there is only one cross-band full-duplex HT in current production (TH-D7), but at least many mobile rigs with 2 VFOs have the ability to work as cross-band repeaters - which also means the ability to work cross-band full-duplex with FM satellites.
Good luck and 73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
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RE: 70cm satellites
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by KG4RUL on January 22, 2008
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I have worked satellites using a handheld arrow, dualband antenna, my iCOM T2H for 2M and an Alinco DJS40 for 70CM.
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RE: 70cm satellites
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by K6LCS on May 22, 2008
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>>...HTs are designed for use either line of sight to other HTs or with local repeaters. They are not designed to be fully functional radios...
What silliness. You have a strange concept of radio operations. Next time i work three COUNTRIES on a single satellite pass (Mexico, the U.S., and Canada) with my Yaesu FT-60R HT, I'll think of you and just smile....
Clint Bradford, K6LCS
http://www.clintbradford.com
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