September 2024 - pacsat-dev - mailman.amsat.org

Fwd: [GOLF-TEE] Re: Recognition of our Engineering Team
by Bill 27 Sep '24

27 Sep '24

FYI -------- Forwarded Message -------- Subject: [GOLF-TEE] Re: Recognition of our Engineering Team Date: Fri, 27 Sep 2024 15:39:59 +0000 From: Jerry Buxton via Golft <golft(a)amsat.org> Reply-To: GOLF-TEE Project Engineering Team <golft(a)amsat.org> To: golft(a)amsat.org CC: Jerry Buxton <vpe(a)amsat.us> So far, I have responses from the following peeps. If you are not on the list, please be sure to send a photo/call/"bio" as originally requested in the email below so I can include hopefully everybody in the recognition. Thanks! Responses I have so far: Burns Doug Ray Jeff Patrick Duane Andrew Carl Alex Jonathan Bill Heimir Joseph Jerry Buxton, NØJY Vice President - Engineering Radio Amateur Satellite Corp. (AMSAT) On 9/18/2024 13:28, Jerry Buxton via Golft wrote: > Hi All, > > I would like to put a face on Engineering for our BOD and in the > Engineering presentation, at Symposium. > > For that I would really like to have a photo of everyone, a "closeup" > of their face as in the likes of a business profile or resume or > otherwise what you use for public presentation of yourself. > If you are like me, where I've not had a photo of that type other than > my DL or passport (although my DL is actually pretty good!), then a > selfie or a photo taken by your spouse or friends or kids in the style > I think you get the idea from the description, is good too. > > To gather this up as quickly and correctly as I can I am asking that > you reply directly to me, vpe(a)amsat.us, from this email or a separate > email with the subject "Recognition of our Engineering Team" so that > my email can sort them into a separate folder. Include the photo of > course, and original size no matter the filesize is best for clarity > in whatever form I'll use it. > > Also please include in your email reply: > First and last name (as you like to be called, e.g. "Jerry" vs. "Gerald" > Your U.S. callsign, and if you have another country include that too > The system(s) you are working on in terms of the "major" piece such as > EPS, ADCS, SDR, IHU and the "piece of the whole", GPS for ADCS/IHU for > example, if applicable > The overall project(s) you are involved in such as GOLF, Fox-Plus, and > in the case of ASCENT the name of the ASCENT project (e.g. SDR-B) > - All of this so I don't miss something or otherwise screw it up in > trying to remember what everyone does, there are a lot more things > going on here than ever before! > > I'm not sure the level of detail I can go to but if I have that all, > the more the merrier in what I can use to present the importance of > this Team to AMSAT as a whole. > > If you have questions or want clarification in what I'm asking, bring > it up on the call tonight and we'll spend a few minutes so it might > answer the question for everyone. > > Thank you! > ----------------------------------------------------------- Golft mailing list -- golft(a)amsat.org View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/golft@amsat.org To unsubscribe send an email to golft-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

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Re: Pacsat dev mtg 9/26/2024
by Chris Thompson 26 Sep '24

26 Sep '24

Ok, now I see the messages saying it was broken. No worries. On Thu, Sep 26, 2024 at 8:08 PM Chris Thompson via pacsat-dev < pacsat-dev(a)amsat.org> wrote: > I have had a Goto meeting screen that says waiting for the meeting to > start for the last 5 mins. Was the meeting delayed? > > On Thu, Sep 26, 2024 at 4:18 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org> > wrote: > >> Pacsat dev mtg 9/26/2024 >> Thu, Sep 26, 2024 7:00 PM - 9:00 PM (CDT) >> >> Please join my meeting from your computer, tablet or smartphone. >> >> https://meet.goto.com/409444917 >> >> You can also dial in using your phone. >> (For supported devices, tap a one-touch number below to join instantly.) >> >> United States: +1 (571) 317-3112 >> - One-touch: tel:+15713173112,,409444917# >> >> Access Code: 409-444-917 >> >> Join from a video-conferencing room or system. >> Dial in or type: 67.217.95.2 or inroomlink.goto.com >> Meeting ID: 409 444 917 >> Or dial directly: 409444917(a)67.217.95.2 or 67.217.95.2##409444917 >> >> >> Get the app now and be ready when your first meeting starts: >> https://meet.goto.com/install >> >> >> >> ----------------------------------------------------------- >> >> pacsat-dev mailing list -- pacsat-dev(a)amsat.org >> View archives of this mailing list at >> https://mailman.amsat.org/hyperkitty/list/pacsat-dev@amsat.org >> To unsubscribe send an email to pacsat-dev-leave(a)amsat.org >> Manage all of your AMSAT-NA mailing list preferences at >> https://mailman.amsat.org >> > > > -- > Chris E. Thompson > chrisethompson(a)gmail.com > g0kla(a)arrl.net > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat-dev@amsat.org > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > -- Chris E. Thompson chrisethompson(a)gmail.com g0kla(a)arrl.net

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Re: GOTO problems
by Burns Fisher (AMSAT) 26 Sep '24

26 Sep '24

Are you all aware that GTM said that as of today you need to use the new version? 73, Burns Fisher, WB1FJ *AMSAT(R) Engineering -- Flight Software* On Thu, Sep 26, 2024 at 8:06 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org> wrote: > Well, something is broken in goto meeting. > I am cancelling tonights meeting and we can meet next Thursday. > > Use the pacsat-dev mailing list if you have something urgent. > > Bill > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat-dev@amsat.org > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org >

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Re: Pacsat dev mtg 9/26/2024
by Chris Thompson 26 Sep '24

26 Sep '24

I have had a Goto meeting screen that says waiting for the meeting to start for the last 5 mins. Was the meeting delayed? On Thu, Sep 26, 2024 at 4:18 PM Bill via pacsat-dev <pacsat-dev(a)amsat.org> wrote: > Pacsat dev mtg 9/26/2024 > Thu, Sep 26, 2024 7:00 PM - 9:00 PM (CDT) > > Please join my meeting from your computer, tablet or smartphone. > > https://meet.goto.com/409444917 > > You can also dial in using your phone. > (For supported devices, tap a one-touch number below to join instantly.) > > United States: +1 (571) 317-3112 > - One-touch: tel:+15713173112,,409444917# > > Access Code: 409-444-917 > > Join from a video-conferencing room or system. > Dial in or type: 67.217.95.2 or inroomlink.goto.com > Meeting ID: 409 444 917 > Or dial directly: 409444917(a)67.217.95.2 or 67.217.95.2##409444917 > > > Get the app now and be ready when your first meeting starts: > https://meet.goto.com/install > > > > ----------------------------------------------------------- > > pacsat-dev mailing list -- pacsat-dev(a)amsat.org > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/pacsat-dev@amsat.org > To unsubscribe send an email to pacsat-dev-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > -- Chris E. Thompson chrisethompson(a)gmail.com g0kla(a)arrl.net

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Re: GOTO problems
by Jim McCullers 26 Sep '24

26 Sep '24

They had problems on last night's meeting as well. See all of you next week, possibly. Jim -----Original Message----- From: Bill via pacsat-dev <pacsat-dev(a)amsat.org> Sent: Thursday, September 26, 2024 7:06 PM To: pacsat-dev(a)amsat.org; k4mvm.22(a)gmail.com Subject: [pacsat-dev] GOTO problems Well, something is broken in goto meeting. I am cancelling tonights meeting and we can meet next Thursday. Use the pacsat-dev mailing list if you have something urgent. Bill ----------------------------------------------------------- pacsat-dev mailing list -- pacsat-dev(a)amsat.org View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/pacsat-dev@amsat.org To unsubscribe send an email to pacsat-dev-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

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GOTO problems
by Bill 26 Sep '24

26 Sep '24

Well, something is broken in goto meeting. I am cancelling tonights meeting and we can meet next Thursday. Use the pacsat-dev mailing list if you have something urgent. Bill

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Re: Pacsat dev mtg 9/26/2024
by Blumenthal, Alex 26 Sep '24

26 Sep '24

Hi all, Am I the only one having trouble joining the meeting or is it not working for others? -Alex ________________________________ From: Bill via pacsat-dev <pacsat-dev(a)amsat.org> Sent: Thursday, September 26, 2024 3:18 PM To: pacsat-dev(a)amsat.org <pacsat-dev(a)amsat.org>; k4mvm.22(a)gmail.com <k4mvm.22(a)gmail.com> Subject: [pacsat-dev] Pacsat dev mtg 9/26/2024 Pacsat dev mtg 9/26/2024 Thu, Sep 26, 2024 7:00 PM - 9:00 PM (CDT) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/409444917 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (571) 317-3112 - One-touch: tel:+15713173112,,409444917# Access Code: 409-444-917 Join from a video-conferencing room or system. Dial in or type: 67.217.95.2 or inroomlink.goto.com Meeting ID: 409 444 917 Or dial directly: 409444917(a)67.217.95.2 or 67.217.95.2##409444917 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install ----------------------------------------------------------- pacsat-dev mailing list -- pacsat-dev(a)amsat.org View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/pacsat-dev@amsat.org To unsubscribe send an email to pacsat-dev-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

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Pacsat dev mtg 9/26/2024
by Bill 26 Sep '24

26 Sep '24

Pacsat dev mtg 9/26/2024 Thu, Sep 26, 2024 7:00 PM - 9:00 PM (CDT) Please join my meeting from your computer, tablet or smartphone. https://meet.goto.com/409444917 You can also dial in using your phone. (For supported devices, tap a one-touch number below to join instantly.) United States: +1 (571) 317-3112 - One-touch: tel:+15713173112,,409444917# Access Code: 409-444-917 Join from a video-conferencing room or system. Dial in or type: 67.217.95.2 or inroomlink.goto.com Meeting ID: 409 444 917 Or dial directly: 409444917(a)67.217.95.2 or 67.217.95.2##409444917 Get the app now and be ready when your first meeting starts: https://meet.goto.com/install

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Re: Amplifier Options & MEMS switches
by Jim McCullers 20 Sep '24

20 Sep '24

Thanks Cameron. I’ll take a look. During last night’s meeting a discussion on using Class C as an amplifier option was discussed. There was additional discussion concerning BPSK and non-linear amplifiers. After the meeting I reviewed BPSK. BPSK is a constant amplitude modulation and therefore can be amplified using non-linear amplification (Class C). The difference in BPSK and FSK is the incorporation of phase shift keying between the two modulation frequencies rather than frequency shift keying as in FSK. Actually it would be correct to refer to FSK as BFSK as both imply a shift between two frequencies. I believe the confusion about BPSK is that it is often demodulated using SSB, more correctly slope detection as many demodulator systems to not support BPSK. I’m not certain if there are Class C modules available and the availability of discrete RF transistors for 70cm and low power. Jim McCullers WA4CWI Good evening, I wanted to follow up on some of the PAs I've been looking at. They're ordered from most to least preferred. I'm not very experienced, so any advice will be well received! * GRF5504 <https://www.guerrilla-rf.com/products/DataSheet?sku=5504&file_name=GRF5504D…> : P1dB of 34.3 dBm @ 460 MHz, so approximately the correct power levels. Very inexpensive and optimized for 70 cm applications (unlike many of the other options). The high gain (44 dB) may warrant less strain on the AX5043 PA and perhaps better performance out of the class E. Its main drawback is poor efficiency, which is expected to be around 50% @ 33dBm (see page 9). * MMG3006NT1 <https://www.mouser.com/datasheet/2/302/MMG3006NT1-3138450.pdf> : I'm a little skeptical of this device as all the measurements are taken at >900 MHz. We'd be using the device at its very lowest end of operation. At the measured frequency, performance is pretty good: P1dB = 33 dBm, 17.5 dB of gain, 2 dB higher NF than the former option. I'd want to test this device before implementing it on the board, as we'd be taking a risk using it at its lower end. * TQP7M9106 <https://www.mouser.com/datasheet/2/412/QP7M9106-1500761.pdf> : They really flaunt the high linearity and bandwidth of this amplifier, but it does have acceptable characteristics at the desired frequencies. Noise figure is around the same as the first option, and current consumption is between the other options. I'm leaning towards the GRF5504 since it seems the most suited for the application, but maybe I'm wrong. There aren't a lot of good options in the 70 cm band. I can test it against a discrete amplifier on our PA test board. I know we're sharing the antenna module with FOX+. Does anyone know how we're switching the resource to the antenna? Perhaps that's a question for the ICD manager. I wanted to suggest using MEMS switches since they're more reliable and take up less board space. We use them at work for our serializer channel switches. I'm not sure how they'll hold up at 2W, but they've proved better than relays in almost every sense. Here <https://www.mdpi.com/1424-8220/24/10/3135> is a report on MEMS switches for antenna switching for space applications. I also wanted to mention that I wrote a report <https://docs.google.com/document/d/1N9ZAk-9m667yN1V_LVc1hHOa87ftJdjcrTFCgRI…> on possible AX5043 replacements (not for an AMSAT group). I know it's not at the top of the list of things to do, but it might be a starting point for someone. Thanks! Cameron ------------------------------------------------- Cameron Castillo KJ7ILB P: (503) 752-8877 --------------------------------------------------

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Amplifier Options & MEMS switches
by Cameron Castillo 20 Sep '24

20 Sep '24

Good evening, I wanted to follow up on some of the PAs I've been looking at. They're ordered from most to least preferred. I'm not very experienced, so any advice will be well received! - GRF5504 <https://www.guerrilla-rf.com/products/DataSheet?sku=5504&file_name=GRF5504D…>: P1dB of 34.3 dBm @ 460 MHz, so approximately the correct power levels. Very inexpensive and optimized for 70 cm applications (unlike many of the other options). The high gain (44 dB) may warrant less strain on the AX5043 PA and perhaps better performance out of the class E. Its main drawback is poor efficiency, which is expected to be around 50% @ 33dBm (see page 9). - MMG3006NT1 <https://www.mouser.com/datasheet/2/302/MMG3006NT1-3138450.pdf>: I'm a little skeptical of this device as all the measurements are taken at >900 MHz. We'd be using the device at its very lowest end of operation. At the measured frequency, performance is pretty good: P1dB = 33 dBm, 17.5 dB of gain, 2 dB higher NF than the former option. I'd want to test this device before implementing it on the board, as we'd be taking a risk using it at its lower end. - TQP7M9106 <https://www.mouser.com/datasheet/2/412/QP7M9106-1500761.pdf>: They really flaunt the high linearity and bandwidth of this amplifier, but it does have acceptable characteristics at the desired frequencies. Noise figure is around the same as the first option, and current consumption is between the other options. I'm leaning towards the GRF5504 since it seems the most suited for the application, but maybe I'm wrong. There aren't a lot of good options in the 70 cm band. I can test it against a discrete amplifier on our PA test board. I know we're sharing the antenna module with FOX+. Does anyone know how we're switching the resource to the antenna? Perhaps that's a question for the ICD manager. I wanted to suggest using MEMS switches since they're more reliable and take up less board space. We use them at work for our serializer channel switches. I'm not sure how they'll hold up at 2W, but they've proved better than relays in almost every sense. Here <https://www.mdpi.com/1424-8220/24/10/3135> is a report on MEMS switches for antenna switching for space applications. I also wanted to mention that I wrote a report <https://docs.google.com/document/d/1N9ZAk-9m667yN1V_LVc1hHOa87ftJdjcrTFCgRI…> on possible AX5043 replacements (not for an AMSAT group). I know it's not at the top of the list of things to do, but it might be a starting point for someone. Thanks! Cameron ------------------------------------------------- Cameron Castillo KJ7ILB *P*: (503) 752-8877 --------------------------------------------------

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