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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BT3UM4XK3QUQO5N5ON3FKBBNARH4AET3/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "BT3UM4XK3QUQO5N5ON3FKBBNARH4AET3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FU55HDZSPAQ6M6322C53UVTJKVRCRWT2/?format=api",
    "sender": {
        "address": "al7eb (a) acsalaska.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Edward R. Cole",
    "subject": "[amsat-bb] Re: Pre amp question",
    "date": "2006-12-15T15:42:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FU55HDZSPAQ6M6322C53UVTJKVRCRWT2/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 10:47 AM 12/15/2006 -0400, you wrote:\n\n>Thanks, Dom. This is excellent helpful advice for those of us with\n>elevation rotors. The V2/V1 ratio with preamp on would provide a relative\n>benchmark to turn to when something seems 'not quite right'. For instance,\n>I know that ice buildup on my yagis due to freezing rain will degrade their\n>performance. I could get some idea of how badly the performance degrades by\n>comparing this \n>ratio in icy conditions to the benchmark taken in ideal conditions. (This\n>would assume that the S component of the S+N was constant over time.\n>Assuming I'm using ground noise, does anyone know if this value changes\n>significantly with ground temperature? Transmitter phase noise as discussed\n>above would, of course, be beyond one's control.) \n>\n>I'm wondering if anyone knows of a reliable piece of software that might do\n>the voltage measurements through a computer and sound card. I've noticed\n>recent projects in QST that appear to entail this sort of measurement, but\n>I don't think any of them had software that performed this basic function.\n>\n>73, Bruce VE9QRP\n\nBruce,\n\nFor antenna noise temperatures we use the kelvin scale 273K = 0C, so avg\ntemps of 17C (290K) will not significantly change for a few degrees change\n(i.e. it is now -15C here = 5F, but this is 258K an change of 258/290).\n\nIf you want absolute accuracy then use your ambient temp in your calculations.\n\nFor sw that uses your soundcard, there are two I can recommend:  JT65 that\nis used mainly for eme has a Moon Echo routine that one could use for\nmeasuring hot/cold sky noise.  Free from:\nhttp://pulsar.princeton.edu/%7Ejoe/K1JT/ \n\nSkyPipe is a free radioastronomy program that will display and graph noise\nlevels on a scale that would eliminate needing to use an audio meter.\nhttp://radiosky.com/\n\n73's,\nEd - KL7UW \n=========================================\nBP40iq,  Nikiski, AK      http://www.qsl.net/al7eb\nAmsat #3212\nModes: V - U - L - S\nUSA Rep. for Dubus Magazine: [email protected]\n=========================================\n\n",
    "attachments": []
}