I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
73, John Brier KG4AKV
Hi John and all
Indeed, I have been able to verify that the upper edge of the passband is higher than the one reported.
In the AOS at about 8º I have been able to hear my return in 435212 khz with a uplink in 145844 khz.
73 de Juan LU2DPW GF05gi
El domingo, 9 de enero de 2022 00:53:58 ART, John Brier johnbrier@gmail.com escribió:
I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
73, John Brier KG4AKV
-----------------------------------------------------------
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Yea that’s my impression as well. If we were to assume the center of the documented passband is incorrect and make it 10KHz HIGHER on the downlink 435.880MHz IIRC then the passband becomes symmetrical.
Herb
Please excuse any typo's as this was sent from my iPhone.
On Jan 9, 2022, at 8:00 AM, LU2DPW Juan Carlos via AMSAT-BB amsat-bb@amsat.org wrote:
Hi John and all
Indeed, I have been able to verify that the upper edge of the passband is higher than the one reported.
In the AOS at about 8º I have been able to hear my return in 435212 khz with a uplink in 145844 khz.
73 de Juan LU2DPW GF05gi
El domingo, 9 de enero de 2022 00:53:58 ART, John Brier johnbrier@gmail.com escribió:
I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
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/amsat-bb@amsat.org 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/
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Thank you Juan.
I hope other people with SDR radios and fixed stations with Az/El rotators will characterize the real center of the passband so we can give people the right info about this satellite. I would hate someone to try and work a part of the passband that didn't exist, and get frustrated.
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:00 AM LU2DPW Juan Carlos lu2dpw@yahoo.com.ar wrote:
Hi John and all
Indeed, I have been able to verify that the upper edge of the passband is higher than the one reported.
In the AOS at about 8º I have been able to hear my return in 435212 khz with a uplink in 145844 khz.
73 de Juan LU2DPW GF05gi
El domingo, 9 de enero de 2022 00:53:58 ART, John Brier johnbrier@gmail.com escribió:
I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
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/amsat-bb@amsat.org 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
Brian Grigsby, KE4IP made a recording of his waterfall:
https://www.youtube.com/watch?v=va-k91dFh4w
Looks like TCA/max elevation is at 01:43 in the video and the passband looks like it's shifted about 9 KHz up from the published frequency. On the bottom end I see a hard cut off at 435.174 and at the top end I see a cut off starting at 435.204 gradually to 435.206.
So maybe the real center frequency of the transponder is 435.189. For manual tuners it's probably easier to just say 435.190.
In my experience when I was using the satellite the uplink passband seemed to be lined up perfectly with the downlink so I would guess the uplink passband is shifted the same amount. I think that would make the uplink passband center frequency 145.861 (for manual tuners easier to say 145.860).
Thoughts?
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:09 AM John Brier johnbrier@gmail.com wrote:
Thank you Juan.
I hope other people with SDR radios and fixed stations with Az/El rotators will characterize the real center of the passband so we can give people the right info about this satellite. I would hate someone to try and work a part of the passband that didn't exist, and get frustrated.
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:00 AM LU2DPW Juan Carlos lu2dpw@yahoo.com.ar wrote:
Hi John and all
Indeed, I have been able to verify that the upper edge of the passband is higher than the one reported.
In the AOS at about 8º I have been able to hear my return in 435212 khz with a uplink in 145844 khz.
73 de Juan LU2DPW GF05gi
El domingo, 9 de enero de 2022 00:53:58 ART, John Brier johnbrier@gmail.com escribió:
I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
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/amsat-bb@amsat.org 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
Hi all,
Interesting characterization of the new bird! It's fun, helpful, and important. In the for what it's worth category: One small but important reminder---using TCA for measurements may be easiest from a "can hear it" perspective, but unless the TLEs are dead on--it's really hard to use that part of the pass. Since HO-113 is a fairly new bird, I'd make sure any observations made at TCA also hold up at AOS or LOS...if they don't, the AOS or LOS observations are probably closer. Just food for thought!
73,
Mark L. Hammond [N8MH] AMSAT Director and Command Station
On Mon, Jan 10, 2022 at 10:16 AM John Brier johnbrier@gmail.com wrote:
Brian Grigsby, KE4IP made a recording of his waterfall:
https://www.youtube.com/watch?v=va-k91dFh4w
Looks like TCA/max elevation is at 01:43 in the video and the passband looks like it's shifted about 9 KHz up from the published frequency. On the bottom end I see a hard cut off at 435.174 and at the top end I see a cut off starting at 435.204 gradually to 435.206.
So maybe the real center frequency of the transponder is 435.189. For manual tuners it's probably easier to just say 435.190.
In my experience when I was using the satellite the uplink passband seemed to be lined up perfectly with the downlink so I would guess the uplink passband is shifted the same amount. I think that would make the uplink passband center frequency 145.861 (for manual tuners easier to say 145.860).
Thoughts?
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:09 AM John Brier johnbrier@gmail.com wrote:
Thank you Juan.
I hope other people with SDR radios and fixed stations with Az/El rotators will characterize the real center of the passband so we can give people the right info about this satellite. I would hate someone to try and work a part of the passband that didn't exist, and get frustrated.
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:00 AM LU2DPW Juan Carlos lu2dpw@yahoo.com.ar
wrote:
Hi John and all
Indeed, I have been able to verify that the upper edge of the passband is higher than the one reported.
In the AOS at about 8º I have been able to hear my return in 435212 khz with a uplink in 145844 khz.
73 de Juan LU2DPW GF05gi
El domingo, 9 de enero de 2022 00:53:58 ART, John Brier <
johnbrier@gmail.com> escribió:
I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
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/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at
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/amsat-bb@amsat.org 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
Thanks Mark!
I didn't think about that. Good point.
73, John Brier KG4AKV
On Mon, Jan 10, 2022 at 11:16 AM Mark L. Hammond marklhammond@gmail.com wrote:
Hi all,
Interesting characterization of the new bird! It's fun, helpful, and important. In the for what it's worth category: One small but important reminder---using TCA for measurements may be easiest from a "can hear it" perspective, but unless the TLEs are dead on--it's really hard to use that part of the pass. Since HO-113 is a fairly new bird, I'd make sure any observations made at TCA also hold up at AOS or LOS...if they don't, the AOS or LOS observations are probably closer. Just food for thought!
73,
Mark L. Hammond [N8MH] AMSAT Director and Command Station
On Mon, Jan 10, 2022 at 10:16 AM John Brier johnbrier@gmail.com wrote:
Brian Grigsby, KE4IP made a recording of his waterfall:
https://www.youtube.com/watch?v=va-k91dFh4w
Looks like TCA/max elevation is at 01:43 in the video and the passband looks like it's shifted about 9 KHz up from the published frequency. On the bottom end I see a hard cut off at 435.174 and at the top end I see a cut off starting at 435.204 gradually to 435.206.
So maybe the real center frequency of the transponder is 435.189. For manual tuners it's probably easier to just say 435.190.
In my experience when I was using the satellite the uplink passband seemed to be lined up perfectly with the downlink so I would guess the uplink passband is shifted the same amount. I think that would make the uplink passband center frequency 145.861 (for manual tuners easier to say 145.860).
Thoughts?
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:09 AM John Brier johnbrier@gmail.com wrote:
Thank you Juan.
I hope other people with SDR radios and fixed stations with Az/El rotators will characterize the real center of the passband so we can give people the right info about this satellite. I would hate someone to try and work a part of the passband that didn't exist, and get frustrated.
73, John Brier KG4AKV
On Sun, Jan 9, 2022 at 9:00 AM LU2DPW Juan Carlos lu2dpw@yahoo.com.ar wrote:
Hi John and all
Indeed, I have been able to verify that the upper edge of the passband is higher than the one reported.
In the AOS at about 8º I have been able to hear my return in 435212 khz with a uplink in 145844 khz.
73 de Juan LU2DPW GF05gi
El domingo, 9 de enero de 2022 00:53:58 ART, John Brier johnbrier@gmail.com escribió:
I did a little test tonight and I think the edge of the top of the passband is around 10KHz higher than published. Don't have time to do the math on the bottom of the passband.
Is my math right?
https://www.youtube.com/watch?v=xSauk0Th-Yw
I could have just zoomed out on the waterfall... oh well.
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/amsat-bb@amsat.org 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/amsat-bb@amsat.org 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
participants (4)
-
Herb Sims -
John Brier -
LU2DPW Juan Carlos -
Mark L. Hammond