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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VPGDXGVEFYDJZXUDVVQBQVRGWZSGL2AG/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "VPGDXGVEFYDJZXUDVVQBQVRGWZSGL2AG", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VPGDXGVEFYDJZXUDVVQBQVRGWZSGL2AG/", "sender": { "address": "nate (a) natetech.com", "mailman_id": null, "emails": null }, "sender_name": "Nate Duehr", "subject": "[amsat-bb] Fwd: Re: Terrestrial QRM to FM satellites", "date": "2007-09-21T07:25:35Z", "parent": null, "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Oops, I replied to Luc and not the list. Meant to send follow-up to \nthe list. LOL!\n\nBegin forwarded message:\n\n> From: Nate Duehr <[email protected]>\n> Date: September 21, 2007 12:42:19 AM MDT\n> To: Luc Leblanc <[email protected]>\n> Subject: Re: [amsat-bb] Re: Terrestrial QRM to FM satellites\n>\n>\n> On Sep 20, 2007, at 3:25 PM, Luc Leblanc wrote:\n>\n>>> There are apparently several stations. I heard a part of a call\n>>> \"?A9??\" on voice and at another time \"/R\" on CW on the 20:00Z\n>>> pass of AO-27 over the US. Someone else was complaining of\n>>> a strong unmodulated carrier for awhile. I guess I'll have to\n>>> set the computer up to start recording. I doubt it's malicious.\n>>> Hopefully it's just \"I didn't know\". But, as time passes, they\n>>> will perceive ownership of the frequency, of course.\n>>>\n>>> Bob\n>> On the 2000Z AO-27 pass i was on this pass and i hear 2 folks \n>> discussing about\n>> a hamfest and they seems to be on a trunking system as we can copy \n>> clearly the\n>> \"trunking tone\" at the beginning of their transmission. AO-27 was \n>> over the\n>> eastern side of NA. If someone is aware of an amateur trunking \n>> like repeater\n>> this can give a clue even if the path of AO-27 was covering near \n>> all North\n>> America...\n>>\n>> P.S. with 50W on a 14 elem cross yagi their signal capture mine!!! \n>> at a time!!!\n>\n> My previous note notwithstanding, this description sounds like it \n> might be a link transmitter for a voted receiver link on a large \n> repeater system.\n>\n> How high was the tone you heard Luc? 1950 Hz or 2175 Hz? Those \n> are the two most common voter \"pilot\" tones for receiver links, one \n> GE the other Motorola, typically.\n>\n> Hams don't use much trunking but in certain areas of the country, \n> voted receiver sites are heavily used, and they might be on VHF now \n> that Auxiliary Stations are allowed in VHF, meaning that repeater \n> links can also be allowed in VHF which wasn't allowable prior to \n> this year -- or the thing might be throwing a wicked spur or \n> something.\n>\n> Generally, but not always... voted systems tend to be in high- \n> population density areas, and the coasts and the eastern mid-west \n> are the most common places to see them used. As you get into the \n> Mountain West, the repeaters are high enough that voting receivers \n> may or may not be useful for anything other than small \"blackout\" \n> area fill-in coverage...\n>\n> But that's not saying a whole lot -- it could literally be anywhere.\n>\n> --\n> Nate Duehr, WY0X\n> [email protected]\n>\n>\n>\n\n--\nNate Duehr\[email protected]\n\n\n\n", "attachments": [] }