What Brandmeister DMR talk group?

On Jan 8, 2022, at 9:13 AM, John Brier [email protected] wrote:

Thanks, Walter!

I recognize your callsign from the AMSAT Brandmeister DMR node, which I've recently started monitoring.

73, John Brier KG4AKV

On Fri, Jan 7, 2022 at 11:46 PM [email protected] wrote:

...

Great video John.

Thanks for sharing..

Walter/K5WH

-----Original Message----- From: John Brier [email protected] Sent: Friday, January 7, 2022 9:29 PM To: AMSAT BB [email protected] Subject: [AMSAT-BB] [Video] New linear satellite HO-113 and its issues

Watch me work this new linear satellite HO-113 / XW-3 and talk about some of its issues so you can learn how to work it successfully despite those issues.

https://youtu.be/NglO_WJ2hhc

00:00 My setup 00:48 Demonstration 03:44 Background on HO-113 04:41 weak downlink, high SWR? 06:03 Real reasons for weak downlink 06:48 Deaf receiver 07:28 Noisy passband

On December 25th, while most of the space community was excitedly discussing the James Webb Space Telescope (JWST) launch of that morning, the amateur radio satellite community was also anticipating their own new satellite launching that evening.

On December 26th at 03:11 UTC, XW-3 (CAS-9), was launched on a CZ-4C launch vehicle from the Taiyuan Satellite Launch Center in China, piggybacked with the ZY-1(02E) earth observation satellite.

XW-3 was designated HO-113 by AMSAT a few days after launch.

Transponder passband frequency table for printing:

https://www.dropbox.com/s/0tsrxs2l2lzr1ix/HO-113_frequency_table.pdf?dl=0

XW-3 user manual: https://www.amsat.org/wordpress/wp-content/uploads/2021/12/XW-3_Amateur_Radi o_Satellite_Users_Manual_V1.0.pdf

This video was based on this article:

https://spacecomms.wordpress.com/2022/01/02/new-chinese-linear-satellite-xw- 3-and-its-issues/

73, John Brier KG4AKV

---

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Thursdays UTC. I’ll clarify on the page that it’s Wednesday night in the US.

73,

Paul, N8HM

On Sat, Jan 8, 2022 at 10:47 John Brier [email protected] wrote:

Node number 98006. There is a net Wednesday nights too. This page needs to be updated though because it says the net is Thursday night.

https://www.amsat.org/amsat-and-amsat-related-nets/

On Sat, Jan 8, 2022 at 10:34 AM Carl Estey [email protected] wrote:

...

What Brandmeister DMR talk group?

On Jan 8, 2022, at 9:13 AM, John Brier [email protected] wrote:

Thanks, Walter!

I recognize your callsign from the AMSAT Brandmeister DMR node, which I've recently started monitoring.

73, John Brier KG4AKV

On Fri, Jan 7, 2022 at 11:46 PM [email protected] wrote:

Great video John.

Thanks for sharing..

Walter/K5WH

-----Original Message----- From: John Brier [email protected] Sent: Friday, January 7, 2022 9:29 PM To: AMSAT BB [email protected] Subject: [AMSAT-BB] [Video] New linear satellite HO-113 and its issues

Watch me work this new linear satellite HO-113 / XW-3 and talk about

some of

...

its issues so you can learn how to work it successfully despite those issues.

https://youtu.be/NglO_WJ2hhc

00:00 My setup 00:48 Demonstration 03:44 Background on HO-113 04:41 weak downlink, high SWR? 06:03 Real reasons for weak downlink 06:48 Deaf receiver 07:28 Noisy passband

On December 25th, while most of the space community was excitedly

discussing

...

the James Webb Space Telescope (JWST) launch of that morning, the amateur radio satellite community was also anticipating their own new satellite launching that evening.

On December 26th at 03:11 UTC, XW-3 (CAS-9), was launched on a CZ-4C

launch

...

vehicle from the Taiyuan Satellite Launch Center in China, piggybacked

with

...

the ZY-1(02E) earth observation satellite.

XW-3 was designated HO-113 by AMSAT a few days after launch.

Transponder passband frequency table for printing:

https://www.dropbox.com/s/0tsrxs2l2lzr1ix/HO-113_frequency_table.pdf?dl=0

...

XW-3 user manual:

https://www.amsat.org/wordpress/wp-content/uploads/2021/12/XW-3_Amateur_Radi

...

o_Satellite_Users_Manual_V1.0.pdf

This video was based on this article:

https://spacecomms.wordpress.com/2022/01/02/new-chinese-linear-satellite-xw-

...

3-and-its-issues/

73, John Brier KG4AKV

---

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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/

View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

---

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.

...

Acceptable Use and Privacy Policies available at

https://www.amsat.org/about-amsat/

...

View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at

https://mailman.amsat.org

...

---

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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/

View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

We have multiple digital Talk-groups and Reflectors, for Amsat, so drop on in and say hi sometime.

Ie..

DMR Amsat-98006

YSF-Fusion US-Amsat-11689

Dstar DCSSAT, REFSAT, XRFSAT, XLXSAT all on Module C

We have DMR and YSF bridged together currently, but the DSTAR is not linked into the bridge just yet, but still planning to do so.

Catch you there before too long.

Walter/K5WH

From: Carl Estey [email protected] Sent: Saturday, January 8, 2022 9:38 AM To: John Brier [email protected] Cc: [email protected]; AMSAT BB [email protected] Subject: Re: [AMSAT-BB] Re: [Video] New linear satellite HO-113 and its issues

What Brandmeister DMR talk group?

On Jan 8, 2022, at 9:13 AM, John Brier <[email protected] mailto:[email protected] > wrote:

Thanks, Walter!

I recognize your callsign from the AMSAT Brandmeister DMR node, which I've recently started monitoring.

73, John Brier KG4AKV

On Fri, Jan 7, 2022 at 11:46 PM <[email protected] mailto:[email protected]

wrote:

Great video John.

Thanks for sharing..

Walter/K5WH

-----Original Message----- From: John Brier <[email protected] mailto:[email protected] > Sent: Friday, January 7, 2022 9:29 PM To: AMSAT BB <[email protected] mailto:[email protected] > Subject: [AMSAT-BB] [Video] New linear satellite HO-113 and its issues

Watch me work this new linear satellite HO-113 / XW-3 and talk about some of its issues so you can learn how to work it successfully despite those issues.

https://youtu.be/NglO_WJ2hhc

00:00 My setup 00:48 Demonstration 03:44 Background on HO-113 04:41 weak downlink, high SWR? 06:03 Real reasons for weak downlink 06:48 Deaf receiver 07:28 Noisy passband

On December 25th, while most of the space community was excitedly discussing the James Webb Space Telescope (JWST) launch of that morning, the amateur radio satellite community was also anticipating their own new satellite launching that evening.

On December 26th at 03:11 UTC, XW-3 (CAS-9), was launched on a CZ-4C launch vehicle from the Taiyuan Satellite Launch Center in China, piggybacked with the ZY-1(02E) earth observation satellite.

XW-3 was designated HO-113 by AMSAT a few days after launch.

Transponder passband frequency table for printing:

https://www.dropbox.com/s/0tsrxs2l2lzr1ix/HO-113_frequency_table.pdf?dl=0

XW-3 user manual: https://www.amsat.org/wordpress/wp-content/uploads/2021/12/XW-3_Amateur_Radi o_Satellite_Users_Manual_V1.0.pdf

This video was based on this article:

https://spacecomms.wordpress.com/2022/01/02/new-chinese-linear-satellite-xw- 3-and-its-issues/

73, John Brier KG4AKV

-----------------------------------------------------------

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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/

View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

-----------------------------------------------------------

Sent via AMSAT-BB(a)amsat.org http://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. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/

View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

Well this video helps a whole lot. Thanks for making it.

I was consulting this transponder passband table I made while watching the video:

https://www.dropbox.com/s/0tsrxs2l2lzr1ix/HO-113_frequency_table.pdf

In your video it definitely looks like the passband is shifted in your video. Paul Stoetzer, N8HM told me he thought it was less sensitive on the edges, and this shows that too, which makes it harder for me to decide where it begins and ends, as it gradually drops off. I'm not sure it's exactly -5KHz/+25KHz, but it definitely looks off. If you had a waterfall that would help too.

Has anyone else seen this?

73, John Brier KG4AKV

On Sat, Jan 8, 2022 at 12:31 PM Herb Sims [email protected] wrote:

John,

My fig is a Yaesu FT-847.

Here is a video I shot of the most recent pass showing how, if you use their published Uplink and Downlink frequencies (which you supplied in another post https://www.amsat.org/wordpress/wp-...Amateur_Radio_Satellite_Users_Manual_V...) then the BPF for the uplink of +/15KHz is most definitely skewed to -5kH/+25KHz. As I walk the uplink (with matched offset for the downlink) you can hear my signal roll-off at -5KHz and again at +25KHz.

https://www.dropbox.com/s/zc7mdy3k5xn9t9t/Showing_BPF_Uplink_Downlink.mov?dl...

Do NOT use the larger frequency boxes as those are Doppler CORRECTED - you will be looking at the frequency above the Doppler shifted values (much smaller font) for the TRUE uplink frequency.

Now assuming their documentation is wrong (i.e. the value of the center of the passband) then if you assume the CENTER of the passband to be 145.880 (UP 10KHz on the uplink) and 435.170 (again DOWN on the frequency) THEN you will have +/-15KHz passband.

---

I think my math is correct on the change of uplink and downlink CENTER frequencies.

---

Herb

What radio are you using? You're the only one who has remarked about this. I really think you just have some settings wrong. Can you set it to normal/non-inverted? Maybe the display is backwards.

On Fri, Jan 7, 2022 at 9:59 PM Herb Sims [email protected] wrote:

John,

Working HO-113 right now....The bandpass is most definitely -5/+25KHz....a simple "walk up/down" of the transmitter shows the roll-off very easily.

Herb

On 1/7/22, 4:30 PM, "John Brier" [email protected] wrote:

 Did you see my response to you on QRZ?

 https://forums.qrz.com/index.php?threads/observations-of-ho-113-formerly-known-as-cas-9-formerly-known-as-xw-3.794829/#post-6067512

 It sounds like you had Mac Doppler in normal/non-inverted mode but
 XW-3, like almost all linear sats (except AO-7 when it is in the 10
 meter uplink mode) are reverse/inverted.

 The -5/+25 KHz you mentioned equals 30 KHz, the width of the passband,
 so it really sounds like that was your issue.

 I'm going to remove reference to this non-symmetrical passband issue
 from my article if you can confirm that's what caused the problem.

 73, John Brier KG4AKV