Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XY7IJYOJR7PXWDP4AZEWPAHWBYLOSTAZ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "B0875B99BEBB44D8AE1E5208370AC7A9@Ron8300PC",
    "message_id_hash": "XY7IJYOJR7PXWDP4AZEWPAHWBYLOSTAZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XY7IJYOJR7PXWDP4AZEWPAHWBYLOSTAZ/?format=api",
    "sender": {
        "address": "w5rkn (a) w5rkn.com",
        "mailman_id": "ce8329f57b214c74b5462b39cfe26858",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ce8329f57b214c74b5462b39cfe26858/emails/?format=api"
    },
    "sender_name": "Ronald G. Parsons",
    "subject": "[amsat-bb] AO-73 frequency fluctuations",
    "date": "2013-11-30T04:31:24Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Using the keps from this morning (epoch 13333.066), I measured the frequency of the telemetry signal of AO-73 during a 43 deg pass at about 1648 UTC (Nov 29). This is a pass with the satellite in the sun\nThe frequencies are the frequency “at the satellite” calculated by SatPC32 to place the center of the telemetry in the middle of my 3.0 kHz USB passband. Thus the frequency of the center “at the satellite” are 1.50 kHz higher than these.\nElevation      xx where the frequency is 145935.xx MHz\n0                  .94\n5                  .87\n10                .81\n15                .73\n20                .70\n25                .62\n30                .60\n35                .56\n40                .57\n43                .54\n40                .48\n35                .42\n30                .37\n25                .39\n20                .36\n15                .32\n10                .30\n5                  .27\n0                  .20\n\nThus a change of about 600 Hz over the entire pass with the frequency DECREASING. \n----------------------------------------------------------------------------------------------\nUsing the keps from this evening (epoch 13333.744), I measured the frequency of the telemetry signal of AO-73 during a 21 deg pass at about 0340 UTC (Nov 30). This is a pass with the satellite in shadow, running on batteries.\nThe frequencies are the frequency “at the satellite” calculated by SatPC32 to place the center of the telemetry in the middle of my 3.0 kHz USB passband. Thus the frequency of the center “at the satellite” are 1.50 kHz higher than these.\nElevation      xx where the frequency is 145934.xx MHz\n0                  145933.98\n5                  .00\n10                .12\n15                .16\n****\n20                .21\n****\n20                .32\n****\n15                .48\n****\n10                .50\n5                  .65\n2.5               .74\n0                  .76\nThus a change of about 800 Hz over the entire pass with the frequency INCREASING. However, where noted with ****, there were were sudden shifts in frequency up and down of 1.0 to 1.5 kHz.\nDuring this pass, the linear transponder was on, and I assume the sudden shifts of frequency noted by **** could have been caused by changes in total power used by the transponder.\n---------------------------------------------------------------------------------------------\nThe first pass above was during battery charging and the frequency decreased. The second pass was during battery discharging and the frequency was increasing.\nThe sudden shifts of frequency are very obvious when you are in QSO on the transponder.\nIt would be interesting for someone to correlate the frequency shifts with some parameter such as voltage or temperature. \nRon W5RKN\nEM10ci\n",
    "attachments": []
}