Email Detail
Show an email
GET /hyperkitty/api/list/[email protected]/email/JWCOFA5DQFHRIDZRDMRMQOCTGVVX5GXF/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JWCOFA5DQFHRIDZRDMRMQOCTGVVX5GXF/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "JWCOFA5DQFHRIDZRDMRMQOCTGVVX5GXF", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XOYNZB64EQ44OMLOJWESG3J5RBH75XV7/", "sender": { "address": "k6vug (a) sbcglobal.net", "mailman_id": "37fd9aee884c4835a5c51104b6295d3a", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/37fd9aee884c4835a5c51104b6295d3a/emails/" }, "sender_name": "[email protected]", "subject": "Re: [amsat-bb] Satpc32", "date": "2019-06-28T02:32:07Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TRPRD3Q6YUZ7PSSX7V7MTUVJX3WGNDNY/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": " Apologies for typo in callsign, WA6LRL should be WA6RLR. \n\n- Umesh\n\n On Thursday, June 27, 2019, 7:25:08 PM PDT, [email protected] <[email protected]> wrote: \n \n \nFYI - Lastly, on general principle, I recorded a couple of short clips illustrating said calibrating procedure for SSB sats, in case anyone is interested. \n\nCalibrating the XW-2C pass and having a nice QSO with WA6LRL: \nhttps://drive.google.com/open?id=1Kio_Rb-KCNTNr_N5ppZWa4MV6wEe9ltd\n\nCalibrating the XW-2B pass and moving around the pass band: \nhttps://drive.google.com/open?id=1lNMD7fjVV3R26r7p1w8y2maeEaAzGF7p\n\nThe setup includes a IC-7000 for the uplink, RTL-SDR for the downlink, HRD provides Doppler correction for the radios and drives a fixed elevation azimuth rotator. \n\nThe tuning process goes like so : \n- First I wait until can listen the CW beacon \n- Then I switch to the transponder frequency pair in HRD Satellite\n- And while briefly transmitting a steady 800 Hz tone via a simple 555 circuit, I calibrate the Rx offset in SDR# for about 800Hz. \n- After that, I can move the Rx across the pass band while HRD does the Doppler trick. \n\nIts like working HF, it almost takes the challenge out of working SSB sats ! Calibrating via SatPC32 would be very similar. \nThe clips show panning across the entire pass band of +/- 10 khz, without having to recalibrate during the pass. \nAlso, the calibration tends to be a little different for each satellite. \n73!\nUmesh\nk6vug\n\n( the pulsing sounds in the second clip is some cross modulation noise and nothing like the Contact movie ! :)\n\n\n\n\n \n \n On Sunday, June 23, 2019, 10:07:07 PM PDT, [email protected] <[email protected]> wrote: \n\n\n\n\n\n\n\nTo add a bit of personal experience - calibrating the uplink forced both stations \"walk\" the band during the QSO. Eventually, realized that adjusting the downlink instead was a better choice, and has been smooth sailing since. \n\nTechnically speaking, the calibration of the downlink takes care of abnormalities in the entire chain and that lets the program (SatPC32 etc.) ensure that the uplink is spot-on any time you pan the downlink, during the pass. \n\n(Disclaimer - while there are a different schools of thought, the above is solely based on personal observations, failures and successes. Individual mileage may vary.) \n \n \n73! \nUmesh, k6vug \n \n \n\n\n \n \n On Sunday, June 23, 2019, 4:49:12 PM PDT, Bob via AMSAT-BB <[email protected]> wrote: \n\n\n\n\n\nHi,\n\nThe manual is your friend. The secret sauce is to adjust your uplink on\nthe CAT menu until you can hear yourself, then save the uplink calibration.\nTrying to tune the radio knob caused both the uplink and downlink to change\nand is not how you calibrate things, but is exactly the behavior you want\n(manually tuning to find someone to call, and being spot on with your\ndownlink too. I do feel sorry for the folks, hundreds (thousands?),\nvainly sending dots/dashes during Field Day attempting to find themselves.\nThe secret sauce is to do that before Field Day. With the exception of\nAO-7 which was unusually far off, all the other dozen+ satellites were\nwithin a couple hundred hertz or less of the calibration values I use at\nhome on my 9100 (in a fairly stable thermal environment).\n\nGood luck, but rest assured that SatPC32 works great controlling Doppler.\n\n73, Bob, WB4SON\n\n\nOn Sun, Jun 23, 2019 at 5:49 PM Bruce via AMSAT-BB <[email protected]>\nwrote:\n\n> I bought a Yaesu G5500 to use during field day this year, we got tired\n> of the arm strong rotor. This is the first time I have used SATPC32 for\n> anything more than AOS-LOS predictions. I still moved the rotor by hand.\n> Have not been able to get the Yaesu cable built to have the LVB tracker\n> control the rotor. May work on that for next year.\n>\n> Used the ICOM IC-9100 and a laptop this year. It worked great to set the\n> frequency for the FM satellites but was horrible for any SSB satellite.\n> I can find myself with the computer turned off. When I tried to use\n> Satpc32, it would jump to somewhere in the passband and no matter how i\n> tried to adjust the radio to find myself, satpc32 had a mind of its own.\n> So, never made an SSB contact. Of course it is more fun to do this\n> during field day with everyone watching.\n>\n> So what is the secret for making Satpc32 see where you have found the\n> sweet spot on the up and down link when you click CAT control instead of\n> doing what it wants? I would have thought it would read the settings\n> from the radio and go from there. After all, it takes me a few seconds\n> to find myself and really easier to adjust for Doppler manually. I\n> wanted to give the automated feature a go for those watching.\n>\n> 73...bruce\n>\n> --\n>\n> Bruce Paige, KK5DO\n>\n> AMSAT Director Contests and Awards\n> AMSAT Board Member 2016-2020\n>\n> ARRL Awards Field Checker (WAS, 5BWAS, VUCC), VE\n>\n> Houston AMSAT Net - Wed 0100z on Echolink - Conference *AMSAT*\n> Also live streaming MP3 at http://www.amsatnet.com\n> Podcast at http://www.amsatnet.com/podcast.xml or iTunes\n>\n> Latest satellite news on the ARRL Audio News\n> http://www.arrl.org\n>\n> AMSAT on Twitter http://www.twitter.com/amsat\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n\n>\n_______________________________________________\nSent via [email protected]. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n\n\n\n \n", "attachments": [] }