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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/B4NXF6R2BE4EY3X6IMR42W7D3B7AIBW4/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "B4NXF6R2BE4EY3X6IMR42W7D3B7AIBW4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QTJJ3METCMSEEET5WELOFRUPK5OBSELC/?format=api",
    "sender": {
        "address": "vk3jed (a) gmail.com",
        "mailman_id": "e049fcabdd4648088cd7ce227ab7c655",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e049fcabdd4648088cd7ce227ab7c655/emails/?format=api"
    },
    "sender_name": "Tony Langdon",
    "subject": "[amsat-bb] Re: Icom D-Star",
    "date": "2011-04-23T21:42:08Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ICXOFTXVJQHNLIUB6THV62CD5UDVYZVK/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 04:42 AM 4/24/2011, Gordon JC Pearce wrote:\n>On Sat, 2011-04-23 at 10:42 -0500, Gregg Wonderly wrote:\n> > In the end, digital compression of spectrum space is going to \n> happen more and\n> > more.  AM style broadcast is hugely inefficient even though it is \n> painfully\n>\n>Okay, but *why*?  Why are we so obsessed with squeezing bandwidth down\n>and down, at the expense of intelligibility?\n\nI find D-STAR more intelligible than a significant proportion of FM \ntransmissions.  And why are we obsessed with reducing bandwidth?  2 reasons:\n\n1.  It's economics, bandwidth is expensive in the commercial world, \nand in the ham world, some countries are suffering congestion.\n\n2.  Reducing the amount of information to be transmitted means more \nrange (Shannon's Law).  And don't we all want a bit more range in the \nham world?\n\n\n>I've got my spectrum analyser hooked up to my 2m aerial at the moment.\n>For the past half hour it has indicated the odd little spike at\n>144.800MHz indicating a little bit of (weak) APRS traffic, a big spike\n>at the output of GB3CS (because it's line-of-sight), a couple of\n>slightly smaller spikes from the other two local repeaters (PA and KE)\n>and a bump where FE, FF and AY are supposed to be (they're quite weak\n>here).\n\nWell, everyone's in a different situation.  I have had days in \nMelbourne where it's hard to find a free 2m simplex frequency.  I'm \ncertain in the US there's places where 2m is congested.  Sure, where \nI am now, 2m is fairly quite, but I'm outside the big cities, and \nseparated from Melbourne by a mountain range.  With only a few dozen \nhams in the area, bandwidth usage isn't a high priority issue, but \nthat's not going to stop me playing with narrowband voice modes.\n\n>This is where D-Star falls down - it's *still* just a 12.5kHz-wide\n>channel.  Without getting into linear PAs and the like, it's going to be\n>quite hard to do anything else and have a useful data rate.\n\nWe do have linear PAs available on VHF and UHF...  We could always do \nFDMDV on 70cm to really save bandwidth. ;)\n\n73 de VK3JED / VK3IRL\nhttp://vkradio.com\n\n",
    "attachments": []
}