Tangerine SDR/PSWS?

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Steve Kaeppler

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Nov 5, 2025, 9:27:26 PM (6 days ago) Nov 5
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Hi Nathaniel et al.,

I was wondering if there are any status updates on the design and
fabrication of the TangerineSDR or the current Hamsci SDR project
status? I thought there would be a new SDR that would more closely
follow the RX888 design, perhaps with some time synchronization and
other enhancements. However, maybe I just don't know what is going on
anymore!

I tried to look on the hamsci website but didn't find anything current.

As an aside, will you (and who else) plans to be at AGU this year?

73,
Steve
AD0AE

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Roy Gertig

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Nov 5, 2025, 10:03:55 PM (6 days ago) Nov 5
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AGU? /Roy, n0rg 

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ghby...@k9trv.org

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Nov 6, 2025, 7:53:17 AM (6 days ago) Nov 6
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The Tangerine SDR was discontinued officially several years ago. COVID, the semiconductor shortage, and Intel buying Altera and making the Max 10 mostly unavailable, killed the project.

George Byrkit, K9TRV
TAPR Store Manager and one of 9 directors

Dr. Nathaniel A. Frissell Ph.D.

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Nov 6, 2025, 8:16:17 AM (6 days ago) Nov 6
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Hi Steve,

As a follow-on to what George has said, for the PSWS we have transitioned to an RX888-based system, which you can read about here: https://hamsci.org/grape-1-drf-overview-specifications-sourcing

There is currently an effort by TAPR members to develop TAPR-designed SDRs based on RX888 design that will eventually have a feature set that is more aligned with science requirements. We will have updates about that as is appropriate.

Yes, I am planning on being at AGU from Sunday-Tuesday, and we have a HamSCI-focused MacGuyver session on Monday. See below! Thanks to Mary Lou West for compiling all the AGU HamSCI info.

73 de Nathaniel

In 2025 the HamSCI community has worked hard and generated ten presentations for the American Geophysical Union annual conference. We will have both oral and poster presentations. Most of them will be in session SA11A - The MacGyver Session: The Place for Novel, Exciting, Self-Made, Hacked, or Improved Sensors and Software Solutions to Understand Space Weather. Of the 38 co-authors, 21 are from universities and 15 are HamSCI community volunteers. It is an exciting community to be a part of!
Check out: https://agu.confex.com/agu/agu25/meetingapp.cgi/Session/265855

1. The HamSCI Personal Space Weather Station Network in 2025: Citizen Science From Sun to Mud, Kristina Collins, Nathaniel A Frissell, William Engelke, Gary Mikitin
Monday, Dec 15, Oral, 8:30 - 8:40, New Orleans Convention Center 283-285
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1946035

2. Novel Radio Instruments and Accessories to Support the HamSCI Personal Space Weather Station Project (Invited)
Paul Elliott, Glenn Ellmore, Nathaniel A Frissell, Rob S Robinett, Clinton Turner
Monday, Dec 15, Oral, 8:40 - 8:50, New Orleans Convention Center 283-285
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1884766


3. Developing New and Novel Ways to Access and Analyze HamSCI Data
William Engelke, Nathaniel A Frissell, Travis Atkinson, Kristina Collins
Monday, Dec 15, Oral, 8:50 - 9:00, New Orleans Convention Center 283-285
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1892183


4. Doppler Radio Observations of the April, 2024 Solar Eclipse Analyzed by Citizen Scientists
Mary Lou West, McKenzie Denton, Gregory Popelas, Robert Spalletta, Ronald Wilcox, Nathaniel A Frissell
Monday, Dec 15, Oral, 9:00 - 9:10, New Orleans Convention Center 283-285
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1997444


5. Toward Automated Analysis of Ionospheric Doppler Spectrograms
Gwyn Griffiths, Nathaniel A Frissell, Rob S Robinett
Monday, Dec 15, Oral, 9:10 - 9:20, New Orleans Convention Center 283-285
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1863616


6. Analysis, Waveform, and Processing Upgrades in the TDOA Method of Measuring Ionospheric Layer Height Using Amateur Radios and Audio Waveforms Sensitive to Multipath Time Difference of Arrival (TDOA)
Steve Cerwin, Jesse McMahan, Alexandros Papadopoulos, Gerard Piccini, Nathaniel A Frissell
Monday, Dec 15, Oral, 9:20 - 9:30, New Orleans Convention Center 283-285
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1883581


7. EPB Impacts on HF Propagation Observed by HamSCI with GOLD and GIRO Support
Kornyanat Hozumi, Nathaniel A Frissell, Diego Sanchez, Ana M. Duque, Ercha Aa
Monday, Dec 15, Poster, 14:15 - 17:45, Hall EFG, Poster Hall, MCCNO
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1900817


8. Ham Radio Investigations of Ionospheric Changes During the April 2024 Total Solar Eclipse
Kuldeep Pandey, Gareth William Perry, Nathaniel A Frissell, Travis Atkinson, William Engelke, Joseph D Huba, Mary Lou West, Philip Gladstone, Gwyn Griffiths, Cameron Cushing, McKenzie Denton, Edward Efchak, Gary Mikitin, H. Ward Silver
Thursday, Dec 18, Poster, 14:15 - 17:45, Hall EFG, Poster Hall
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1934648


9. Ionospheric Plasma Density Variations During the April 2024 Total Solar Eclipse: Observations and Modeling
Kuldeep Pandey, Gareth William Perry, Bharat Kundun, Daniel Emmons, David Themens, Joseph D Huba, Alex Chartier
Monday, Dec 15, 8:30-12:00, Hall EFG (Poster Hall) (New Orleans Convention Center)
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1933867


10. Effect of Equatorial Plasma Bubbles on High-Frequency Wave Propagation
Isaiah Scafffidi, Jay Johnson, Eun-Hwa Kim, Kornyanat Hozumi, Simon Wing, Nathaniel A Frissell
Wed, Dec 17, 14:15-17:45, Hall EFG (Poster Hall) (New Orleans Convention Center)
https://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1873526

-----Original Message-----
From: ham...@googlegroups.com <ham...@googlegroups.com> On Behalf Of ghby...@k9trv.org
Sent: Thursday, November 6, 2025 7:53 AM
To: ham...@googlegroups.com
Subject: RE: [HamSCI] Tangerine SDR/PSWS?

WARNING: This message originated from a source outside of the university.
To view this discussion visit https://groups.google.com/d/msgid/hamsci/026601dc4f1c%244e5f4fa0%24eb1deee0%24%40k9trv.org.


Please use your best judgment when opening attachments, clicking links, or replying to this email. If you suspect this is a phishing attempt, please forward to inf...@scranton.edu. Other questions can be directed to the Technology Support Center at (570) 941-4357 or techs...@scranton.edu.

Steve Kaeppler

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Nov 6, 2025, 9:06:57 AM (6 days ago) Nov 6
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Dear Nathaniel-

Thank you for the update. I know we talked about this at CEDAR to
some degree, but it sounds like if I wanted to make a PSWS at this
point the best way would be to buy a RX888 and Leo Bodnar, install
ka9q radio and get help as needed from Rob Robinett on setting up the
wspr daemon. I will just add that the ka9q software seems to be
pretty powerful and I suspect if a lot of channels could have IQ data
saved off individually that would be a great way to be able to record
a lot of the HF spectrum.

I will continue to advocate that whatever is developed with the
RX888-ish hardware should incorporate time synchronization to PPS.
From my non-exhaustive testing of SDRs, the only ones that can do this
are the Ettus radios and the HackRF One. Finally, as you probably
know the Ettus N2XX radios are now deprecated, so while you can get
them on the used market, they are not being manufactured anymore.

Anyway, I look forward to more updates as they come.

Regarding AGU, I believe I will miss you unfortunately! If I go, I
will only be there on Wednesday and Thursday.

Thanks and 73,
Steve
AD0AE
> To view this discussion visit https://groups.google.com/d/msgid/hamsci/BN7PR03MB4403C165CE175098731BC47DF2C2A%40BN7PR03MB4403.namprd03.prod.outlook.com.

Dr. Nathaniel A. Frissell Ph.D.

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Nov 6, 2025, 9:10:24 AM (6 days ago) Nov 6
to ham...@googlegroups.com
Hi Steve,

Yes, I completely agree with the time synchronization. We have people working on a solution that will inject a PPS from a 2-port LeoBodnar directly into the signal from the antenna. This marker will be recorded with the rest of the data, allowing for the precise timing to be recovered in data processing.

73 de Nathaniel

From: ham...@googlegroups.com <ham...@googlegroups.com> on behalf of Steve Kaeppler <steve.k...@gmail.com>
Date: Thursday, November 6, 2025 at 9:07 AM
To: ham...@googlegroups.com <ham...@googlegroups.com>
Subject: Re: [HamSCI] Tangerine SDR/PSWS?

WARNING: This message originated from a source outside of the university.



Dear Nathaniel-

Thank you for the update.  I know we talked about this at CEDAR to
some degree, but it sounds like if I wanted to make a PSWS at this
point the best way would be to buy a RX888 and Leo Bodnar, install
ka9q radio and get help as needed from Rob Robinett on setting up the
wspr daemon.  I will just add that the ka9q software seems to be
pretty powerful and I suspect if a lot of channels could have IQ data
saved off individually that would be a great way to be able to record
a lot of the HF spectrum.

I will continue to advocate that whatever is developed with the
RX888-ish hardware should incorporate time synchronization to PPS.
From my non-exhaustive testing of SDRs, the only ones that can do this
are the Ettus radios and the HackRF One.  Finally, as you probably
know the Ettus N2XX radios are now deprecated, so while you can get
them on the used market, they are not being manufactured anymore.

Anyway, I look forward to more updates as they come.

Regarding AGU, I believe I will miss you unfortunately!  If I go, I
will only be there on Wednesday and Thursday.

Thanks and 73,
Steve
AD0AE

On Thu, Nov 6, 2025 at 8:16 AM Dr. Nathaniel A. Frissell Ph.D.
<nathaniel...@scranton.edu> wrote:
>
> Hi Steve,
>

>
> There is currently an effort by TAPR members to develop TAPR-designed SDRs based on RX888 design that will eventually have a feature set that is more aligned with science requirements. We will have updates about that as is appropriate.
>
> Yes, I am planning on being at AGU from Sunday-Tuesday, and we have a HamSCI-focused MacGuyver session on Monday. See below! Thanks to Mary Lou West for compiling all the AGU HamSCI info.
>
> 73 de Nathaniel
>
> In 2025 the HamSCI community has worked hard and generated ten presentations for the American Geophysical Union annual conference. We will have both oral and poster presentations. Most of them will be in session SA11A - The MacGyver Session: The Place for Novel, Exciting, Self-Made, Hacked, or Improved Sensors and Software Solutions to Understand Space Weather. Of the 38 co-authors, 21 are from universities and 15 are HamSCI community volunteers. It is an exciting community to be a part of!

>
> 1.         The HamSCI Personal Space Weather Station Network in 2025: Citizen Science From Sun to Mud, Kristina Collins, Nathaniel A Frissell, William Engelke, Gary Mikitin
> Monday, Dec 15, Oral, 8:30 - 8:40, New Orleans Convention Center 283-285

>
> 2.         Novel Radio Instruments and Accessories to Support the HamSCI Personal Space Weather Station Project (Invited)
> Paul Elliott, Glenn Ellmore, Nathaniel A Frissell, Rob S Robinett, Clinton Turner
> Monday, Dec 15, Oral, 8:40 - 8:50, New Orleans Convention Center 283-285

>
>
> 3.         Developing New and Novel Ways to Access and Analyze HamSCI Data
> William Engelke, Nathaniel A Frissell, Travis Atkinson, Kristina Collins
> Monday, Dec 15, Oral, 8:50 - 9:00, New Orleans Convention Center 283-285

>
>
> 4.         Doppler Radio Observations of the April, 2024 Solar Eclipse Analyzed by Citizen Scientists
> Mary Lou West, McKenzie Denton, Gregory Popelas, Robert Spalletta, Ronald Wilcox, Nathaniel A Frissell
> Monday, Dec 15, Oral, 9:00 - 9:10, New Orleans Convention Center 283-285

>
>
> 5.         Toward Automated Analysis of Ionospheric Doppler Spectrograms
> Gwyn Griffiths, Nathaniel A Frissell, Rob S Robinett
> Monday, Dec 15, Oral, 9:10 - 9:20, New Orleans Convention Center 283-285

>
>
> 6.         Analysis, Waveform, and Processing Upgrades in the TDOA Method of Measuring Ionospheric Layer Height Using Amateur Radios and Audio Waveforms Sensitive to Multipath Time Difference of Arrival (TDOA)
> Steve Cerwin, Jesse McMahan, Alexandros Papadopoulos, Gerard Piccini, Nathaniel A Frissell
> Monday, Dec 15, Oral, 9:20 - 9:30, New Orleans Convention Center 283-285

>
>
> 7.         EPB Impacts on HF Propagation Observed by HamSCI with GOLD and GIRO Support
> Kornyanat Hozumi, Nathaniel A Frissell, Diego Sanchez, Ana M. Duque, Ercha Aa
> Monday, Dec 15, Poster, 14:15 - 17:45, Hall EFG, Poster Hall, MCCNO

>
>
> 8.         Ham Radio Investigations of Ionospheric Changes During the April 2024 Total Solar Eclipse
> Kuldeep Pandey, Gareth William Perry, Nathaniel A Frissell, Travis Atkinson, William Engelke, Joseph D Huba, Mary Lou West, Philip Gladstone, Gwyn Griffiths, Cameron Cushing, McKenzie Denton, Edward Efchak, Gary Mikitin, H. Ward Silver
> Thursday, Dec 18, Poster, 14:15 - 17:45, Hall EFG, Poster Hall

>
>
> 9.         Ionospheric Plasma Density Variations During the April 2024 Total Solar Eclipse: Observations and Modeling
> Kuldeep Pandey, Gareth William Perry, Bharat Kundun, Daniel Emmons, David Themens, Joseph D Huba, Alex Chartier
> Monday, Dec 15, 8:30-12:00, Hall EFG (Poster Hall) (New Orleans Convention Center)

>
>
> 10.   Effect of Equatorial Plasma Bubbles on High-Frequency Wave Propagation
> Isaiah Scafffidi, Jay Johnson, Eun-Hwa Kim, Kornyanat Hozumi, Simon Wing, Nathaniel A Frissell
> Wed, Dec 17, 14:15-17:45, Hall EFG (Poster Hall) (New Orleans Convention Center)

> ---
> You received this message because you are subscribed to the Google Groups "HamSCI" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to hamsci+un...@googlegroups.com.
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>
> --
> Please follow the HamSCI Community Participation Guidelines at https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhamsci.org%2Fhamsci-community-participation-guidelines&data=05%7C02%7Cnathaniel.frissell%40scranton.edu%7C1cf42b4c5452463584d508de1d3dbf99%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C638980348219800989%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=jwebG4GRY4zS4dAec7NYZE1BX8v0yjoiVvoBm4iu0fo%3D&reserved=0.

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>
>
> Please use your best judgment when opening attachments, clicking links, or replying to this email. If you suspect this is a phishing attempt, please forward to inf...@scranton.edu. Other questions can be directed to the Technology Support Center at (570) 941-4357 or techs...@scranton.edu.
>
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Steve Kaeppler
steve.k...@gmail.com
cell: 262-707-0932
Amateur Radio Call: AD0AE/6

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Steve Kaeppler

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Nov 6, 2025, 9:12:23 AM (6 days ago) Nov 6
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Hi Nathaniel-

Thanks for the fast response. Is there any information on how this
injection is being done? Like a document? I'd like to learn more.
Jonathan Rizzo sent me something a while back on this with meteor
radio systems, but I am not sure if that is what the plan is going
forward.

I have a lot of interest in this now and if I can get a grad student
to help work on this, maybe that would be of mutual benefit for
everyone.

Thanks,
Steve

On Thu, Nov 6, 2025 at 9:10 AM Dr. Nathaniel A. Frissell Ph.D.
> Please follow the HamSCI Community Participation Guidelines at http://hamsci.org/hamsci-community-participation-guidelines.
> ---
> You received this message because you are subscribed to the Google Groups "HamSCI" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to hamsci+un...@googlegroups.com.
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Dr. Nathaniel A. Frissell Ph.D.

unread,
Nov 6, 2025, 9:15:47 AM (6 days ago) Nov 6
to ham...@googlegroups.com
Hi Steve,

We do not have any documentation on that right now, but the team that is working on that meets on Monday nights. Yes, we would be interested in having a grad student be involved.

Perhaps you can e-mail me off-list or give me a call and we can discuss more.

73 de Nathaniel


> >
> > There is currently an effort by TAPR members to develop TAPR-designed SDRs based on RX888 design that will eventually have a feature set that is more aligned with science requirements. We will have updates about that as is appropriate.
> >
> > Yes, I am planning on being at AGU from Sunday-Tuesday, and we have a HamSCI-focused MacGuyver session on Monday. See below! Thanks to Mary Lou West for compiling all the AGU HamSCI info.
> >
> > 73 de Nathaniel
> >
> > In 2025 the HamSCI community has worked hard and generated ten presentations for the American Geophysical Union annual conference. We will have both oral and poster presentations. Most of them will be in session SA11A - The MacGyver Session: The Place for Novel, Exciting, Self-Made, Hacked, or Improved Sensors and Software Solutions to Understand Space Weather. Of the 38 co-authors, 21 are from universities and 15 are HamSCI community volunteers. It is an exciting community to be a part of!

> >
> > 1.         The HamSCI Personal Space Weather Station Network in 2025: Citizen Science From Sun to Mud, Kristina Collins, Nathaniel A Frissell, William Engelke, Gary Mikitin
> > Monday, Dec 15, Oral, 8:30 - 8:40, New Orleans Convention Center 283-285

> >
> > 2.         Novel Radio Instruments and Accessories to Support the HamSCI Personal Space Weather Station Project (Invited)
> > Paul Elliott, Glenn Ellmore, Nathaniel A Frissell, Rob S Robinett, Clinton Turner
> > Monday, Dec 15, Oral, 8:40 - 8:50, New Orleans Convention Center 283-285

> >
> >
> > 3.         Developing New and Novel Ways to Access and Analyze HamSCI Data
> > William Engelke, Nathaniel A Frissell, Travis Atkinson, Kristina Collins
> > Monday, Dec 15, Oral, 8:50 - 9:00, New Orleans Convention Center 283-285

> >
> >
> > 4.         Doppler Radio Observations of the April, 2024 Solar Eclipse Analyzed by Citizen Scientists
> > Mary Lou West, McKenzie Denton, Gregory Popelas, Robert Spalletta, Ronald Wilcox, Nathaniel A Frissell
> > Monday, Dec 15, Oral, 9:00 - 9:10, New Orleans Convention Center 283-285

> >
> >
> > 5.         Toward Automated Analysis of Ionospheric Doppler Spectrograms
> > Gwyn Griffiths, Nathaniel A Frissell, Rob S Robinett
> > Monday, Dec 15, Oral, 9:10 - 9:20, New Orleans Convention Center 283-285

> >
> >
> > 6.         Analysis, Waveform, and Processing Upgrades in the TDOA Method of Measuring Ionospheric Layer Height Using Amateur Radios and Audio Waveforms Sensitive to Multipath Time Difference of Arrival (TDOA)
> > Steve Cerwin, Jesse McMahan, Alexandros Papadopoulos, Gerard Piccini, Nathaniel A Frissell
> > Monday, Dec 15, Oral, 9:20 - 9:30, New Orleans Convention Center 283-285

> >
> >
> > 7.         EPB Impacts on HF Propagation Observed by HamSCI with GOLD and GIRO Support
> > Kornyanat Hozumi, Nathaniel A Frissell, Diego Sanchez, Ana M. Duque, Ercha Aa
> > Monday, Dec 15, Poster, 14:15 - 17:45, Hall EFG, Poster Hall, MCCNO

> >
> >
> > 8.         Ham Radio Investigations of Ionospheric Changes During the April 2024 Total Solar Eclipse
> > Kuldeep Pandey, Gareth William Perry, Nathaniel A Frissell, Travis Atkinson, William Engelke, Joseph D Huba, Mary Lou West, Philip Gladstone, Gwyn Griffiths, Cameron Cushing, McKenzie Denton, Edward Efchak, Gary Mikitin, H. Ward Silver
> > Thursday, Dec 18, Poster, 14:15 - 17:45, Hall EFG, Poster Hall

> >
> >
> > 9.         Ionospheric Plasma Density Variations During the April 2024 Total Solar Eclipse: Observations and Modeling
> > Kuldeep Pandey, Gareth William Perry, Bharat Kundun, Daniel Emmons, David Themens, Joseph D Huba, Alex Chartier
> > Monday, Dec 15, 8:30-12:00, Hall EFG (Poster Hall) (New Orleans Convention Center)

> >
> >
> > 10.   Effect of Equatorial Plasma Bubbles on High-Frequency Wave Propagation
> > Isaiah Scafffidi, Jay Johnson, Eun-Hwa Kim, Kornyanat Hozumi, Simon Wing, Nathaniel A Frissell
> > Wed, Dec 17, 14:15-17:45, Hall EFG (Poster Hall) (New Orleans Convention Center)

> > ---
> > You received this message because you are subscribed to the Google Groups "HamSCI" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to hamsci+un...@googlegroups.com.
> > To view this discussion visit https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fd%2Fmsgid%2Fhamsci%2FCANK6cPpw_jKYZ2kRg85jZ1Cd3Nni4sDucdPwzqSxz2nbAKY__g%2540mail.gmail.com&data=05%7C02%7Cnathaniel.frissell%40scranton.edu%7C59c3c61b3cc64a96587808de1d3e8224%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C638980351472955197%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=t3p9Mb2aTm4es%2B3PVJpTdJ7ExfljCAQqdS%2FuwGBhr9s%3D&reserved=0.
> >
> > --
> > Please follow the HamSCI Community Participation Guidelines at https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhamsci.org%2Fhamsci-community-participation-guidelines&data=05%7C02%7Cnathaniel.frissell%40scranton.edu%7C59c3c61b3cc64a96587808de1d3e8224%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C638980351474021947%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=yvQROcqIGx644FEP1cUeEJVpDB9BmNPJjRdxwmuujnA%3D&reserved=0.

> > ---
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> >
> >
> > Please use your best judgment when opening attachments, clicking links, or replying to this email. If you suspect this is a phishing attempt, please forward to inf...@scranton.edu. Other questions can be directed to the Technology Support Center at (570) 941-4357 or techs...@scranton.edu.
> >
> > --

> > ---
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>
>
>
> --
>
> --------------------------------------------------------------------
> Steve Kaeppler
> steve.k...@gmail.com
> cell: 262-707-0932
> Amateur Radio Call: AD0AE/6
>
> --

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Steve Kaeppler
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cell: 262-707-0932
Amateur Radio Call: AD0AE/6

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Phil Erickson

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Nov 6, 2025, 9:57:38 AM (6 days ago) Nov 6
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Hi Steve,

  To add a bit more to the picture, when the timing synchronization idea emerged - essentially encode the time sync in a modulated RF input on a center frequency well separate from the main science frequency band - I briefly pointed out to the group that we have been doing this same sort of technical approach for the Millstone Hill production software radar system for at least 15+ years now; it was Frank Lind's original idea for us.  In our case, it is used not as a PPS (the Ettus hardware does that) but as a metadata tag, which when demodulated identifies an ID telling the system which transmit waveform is being sent in an individual radar pulse.  However, the principle works much the same.  It will work in the end, and Nathaniel can describe the successes already achieved in the testing he's done.

  It's a way in software to do what the SDR hardware was doing, and the additional compute load is not very big on today's processing platforms.  Elegance!

73
Phil W1PJE

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Phil Erickson
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Terry Bullett

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Nov 9, 2025, 8:02:34 PM (2 days ago) Nov 9
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Phil,

I fully endorse the concept of some kind of station ID being encoded on oblique HF sounding.  Back in to 80's it was impossible to do this.  I am involved with a network of oblique sounding in East Asia using 2010 era VIPIR radar systems, and station ID is done by a complicated and restrictive sounding schedule.  The key to doing this is not compromising the measurement statistics.  

Cheers,

Terry
To view this discussion visit https://groups.google.com/d/msgid/hamsci/CAAZaqEtGW_mRdN4j6QFQo28hJZXTTwhE8kqOfPPwgZD1W0froA%40mail.gmail.com.

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Dr. Terry Bullett          WØASP 
NOAA National Centers for Environmental Information (NOAA/NCEI)
Cooperative Institute for Research in Environmental Sciences (CIRES)
Terry....@noaa.gov    720-446-9775 (google voice)  978-337-9092 (cell)   
"Life is Complex.  It has a Real part and an Imaginary part."
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