July 2016 - AMSAT-BB - mailman.amsat.org

Re: [amsat-bb] Mode K
by rsoifer1＠aol.com 01 Jul '16

01 Jul '16

Bob, For more on HF satellite reception, see my article in October 1970 and Technical Correspondence in November 1968 QST. There are also some articles in Proc IRE by W8JK (SK) in the late 1950s, mostly about antipodal reception which GM4IHJ and I also noted. Interestingly, Owen W5LFL also worked with Kraus on this and is listed as a co-author. 73 Ray W2RS (then K2QBW).

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Re: [amsat-bb] AO-85 9k6 data
by skristof＠etczone.com 01 Jul '16

01 Jul '16

I use HD sdr with an rtl-sdr to get data from ao-85. I usually set the audio filter at about 500 hz since I'm just collecting data. Sounds like I'll need to open that up for any 9k6 data. Thanks for the replies!Steve AI9IN Sent from my Verizon Wireless 4G LTE smartphone-------- Original message --------From: Andrew Glasbrenner <glasbrenner(a)mindspring.com> Date: 7/1/2016 10:01 AM (GMT-05:00) To: Scott <scott23192(a)gmail.com> Cc: amsat-bb(a)amsat.org Subject: Re: [amsat-bb] AO-85 9k6 data Correct. I find 12-15 kHz works best on the AO-85 9k6 data with SDR#. 73, Drew KO4MA > On Jul 1, 2016, at 9:58 AM, Scott <scott23192(a)gmail.com> wrote: > > Do I recall correctly that in order to receive the higher data rate, a wider RF and/or audio bandwidth might be required? > > I often have the audio bandwidth narrowed a bit (high end only) to better hear the voice traffic, which of course has no effect on the DUV as long as the low end of the audio filter is left at zero. Ditto on the RF bandwidth if it makes the voices easier to copy on a given pass. > > -Scott, K4KDR > Montpelier, VA USA > > > -------------------------------------------------------------------------------- > > -----Original Message----- From: Alan > Sent: Friday, July 01, 2016 9:49 AM > To: skristof(a)etczone.com ; amsat-bb(a)amsat.org > Subject: Re: [amsat-bb] AO-85 9k6 data > > Steve, > > 9k6 data is not used very much on AO-85 since it is not required for any of the experiments, and its > use turns off the repeater. It is turned on, rarely and briefly, for testing or other purposes. > There is usually an announcement on Twitter, Facebook and/or here in advance, though not always if > they are doing a quick look. The Auto mode will pick it up, assuming everything else is working > correctly at your station. It has been reported that the signal threshold to copy 9k6 is somewhat > higher than for DUV. > > Expect to see much more when Fox-1Cliff and Fox-1D fly. > > 73s, > > Alan > WA4SCA > > > > > <-----Original Message----- > <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of skristof(a)etczone.com > <Sent: Friday, July 01, 2016 6:11 AM > <To: amsat-bb(a)amsat.org > <Subject: [amsat-bb] AO-85 9k6 data > < > <I'm getting the hang of grabbing the AO-85 DUV data stream, but still > <haven't caught any 9k6 data. > < > <Can I get a quick refresher on when the 9k6 data is transmitted, please? > <I assume that FoxTelem set to "Auto" mode will pick it up when it > <happens, but please correct me on that if I'm wrong there also. > < > <Pointing me towards on informational url would be fine, but personal > <messages are lovely. > < > <Steve AI9IN > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available > to all interested persons worldwide without requiring membership. Opinions expressed > are solely those of the author, and do not reflect the official views of AMSAT-NA. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

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AO-85 9k6 data
by skristof＠etczone.com 01 Jul '16

01 Jul '16

I'm getting the hang of grabbing the AO-85 DUV data stream, but still haven't caught any 9k6 data. Can I get a quick refresher on when the 9k6 data is transmitted, please? I assume that FoxTelem set to "Auto" mode will pick it up when it happens, but please correct me on that if I'm wrong there also. Pointing me towards on informational url would be fine, but personal messages are lovely. Steve AI9IN

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SatPC32 leading the satellite
by Jim White 01 Jul '16

01 Jul '16

I was at a university ground station today and noted their antennas were not keeping up with their satellite on a high elevation pass. They are using SatPC32 with the G5500 rotor. They have the dead band set to 3 degrees. Since they are using a pair of long UHF Yagis for a total of 21dB gain there were some lost packets for about 2 minutes or so around TCA. Their sat was deployed from the ISS so is currently at about 400km altitude which means it's zipping by rather quickly when the elevation is above about 75 degrees or so. In the past I've used tracking programs that allowed a 'lead' setting. That is, you could tell the software to lead the satellite by a few seconds. That did a pretty good job keeping the sat in the beam width when the AZ was changing quickly. I'm not finding that setting in SatPC32. Is there one, or another setting to accomplish the same thing? Jim

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Mode K
by rsoifer1＠aol.com 01 Jul '16

01 Jul '16

The late John Branegan, GM4IHJ (CDR, Royal Navy) did a lot of good research on Mode K using the RS birds. It can be an effective way of working satellite DX despite today's low orbits. 73 Ray W2RS

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