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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SI6QQPHBTDULN3PC7CJGVB6CDYCXOZFB/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAN6TEUeZYPo2UnaiKajabg6PMfY8+d+Fvxt4o6CLbJv4A91Maw@mail.gmail.com",
    "message_id_hash": "SI6QQPHBTDULN3PC7CJGVB6CDYCXOZFB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RWMK2QVLL5LTKVOYCLTH57T5PYNMO44I/?format=api",
    "sender": {
        "address": "amsat-bb (a) wd9ewk.net",
        "mailman_id": "21664df01bef4757931b7cdb42a9e768",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/21664df01bef4757931b7cdb42a9e768/emails/?format=api"
    },
    "sender_name": "Patrick STODDARD (WD9EWK/VA7EWK)",
    "subject": "[amsat-bb] Re: Listening on USB when operating CW",
    "date": "2014-02-07T17:24:58Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RWMK2QVLL5LTKVOYCLTH57T5PYNMO44I/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Clayton,\n\n\n\nLately, as I have been listening a lot more with my FUNcube Dongle\n> Pro+, I have observed many CW stations drifting across the satellites'\n> passband.  I realize this is not a new phenomenon.  I would assume\n> these drifting stations are NOT using any type of computer Doppler\n> correction.  If they were using computer control, I would assume their\n> CW would stay on the same place in the transponder's passband.  It is\n> visually apparent when the stations manually make larger frequency\n> movements because of the curve displayed on my SDR application's\n> waterfall display.\n>\n>\nYou're basically correct.\n\nStations using full computer control like what you get in SatPC32 will\nbe able to keep their frequencies steady at the satellite, but there\nwould still be some drift in what you observe on your SDR software's\nwaterfall display.  I also see this when I'm working those stations\nwith my portable two-radio setup, where I'm having to make minor\nadjustments on both my uplink and downlink frequencies to keep up with\nthe other station.  For the mode B satellites where the operators are\nonly adjusting the higher of the two frequencies (uplink), it might be\neasier to keep the downlink frequency at your receiver from drifting\nso much.  There would be some drift at the satellite, but not so much\non your waterfall display.\n\n\n> My question is, does it make sense for people using CW on the\n> satellites to have their receiver set to USB?  Do some operators do\n> this?  If listening on a VFO with USB and had your transmit VFO set to\n> CW, would this help make it easier for CW ops to know when they have\n> drifted into an existing voice QSO?\n>\n\nFor the few times I have worked CW via satellite, I always set my\nreceiver to USB.  Without computer control, I would have to be\nadjusting my receive VFO all the time to keep the CW signal in my\nreceiver's CW passband if it drifted.  My ear can do an OK job of\ndealing with the drifting signal (changing pitch of the CW) when\nthe receiver is in USB.  When I use USB, I also avoid using any\nnarrow receive filtering.\n\nFor the FUNcube Dongle Pro+ and HDSDR, I only use USB on these\nsatellites.  I may widen the audio passband HDSDR has for USB,\nbut I don't bother putting it into CW when copying CW signals.\n\n73!\n\n\n\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\n",
    "attachments": []
}