Re: Friday Lunch, ops and FARS meeting
I'll be at lunch and ops tomorrow.
?
Chris W6COV
?
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Re: Friday Lunch, ops and FARS meeting
I'll be there.? Dick K6PBF
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I plan to be at the Baylands cafe for lunch (noon) and ops by the bay. I also will be going to dinner at Charles (6 PM) in Los Altos followed by the FARS meeting at 7 PM.
Hope to see you,? Dave W6VYC
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Re: Friday Lunch, ops and FARS meeting
Y'all have fun tomorrow!? Looks like perfect weather!
I have Dr appt in Pleasanton tomorrow so will miss ops, dinner, FARS, Steve's talk looks very interesting.
Is anyone doing anything for Winter Field Day this weekend?? If I get out it'll be at the park with kx2 and alexloop.
Last Saturday we went to the summit of Mt Diablo, for the VHF+ contest.? That was fantastic!!? Many 2m/70/23 QSOs from 1100 to 1230 or so, then fun times playing microwaves until 4pm.
Any reason to get fresh air and sunshine is a good one!
Cliff K6CLS
On January 23, 2025 8:32:17 AM PST, "David W Crocker via groups.io" <dwcae@...> wrote:
I plan to be at the Baylands cafe for lunch (noon) and ops by the bay. I also will be going to dinner at Charles (6 PM) in Los Altos followed by the FARS meeting at 7 PM.
Hope to see you,? Dave W6VYC
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Re: Friday Lunch, ops and FARS meeting
I expect to be there this week, probably shortly after lunch.
73 ?Connie W6EFI
On Thu, Jan 23, 2025 at 08:32, David W Crocker via groups.io < dwcae@...> wrote:
I plan to be at the Baylands cafe for lunch (noon) and ops by the bay. I also will be going to dinner at Charles (6 PM) in Los Altos followed by the FARS meeting at 7 PM.
Hope to see you,? Dave W6VYC
--
Connie KN2EFI
|
Friday Lunch, ops and FARS meeting
I plan to be at the Baylands cafe for lunch (noon) and ops by the bay. I also will be going to dinner at Charles (6 PM) in Los Altos followed by the FARS meeting at 7 PM.
Hope to see you,? Dave W6VYC
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Thank you. If you send it early, that¡¯s ok too. The post office will hold it for me.
Hiroki
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On Jan 17, 2025, at 14:31, Doug Hendricks via groups.io <ki6ds1@...> wrote:
? Hiroki,? I will hold your Feb. CalQrp kit until your return.? Enjoy the trip.
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Hiroki,? I will hold your Feb. CalQrp kit until your return.? Enjoy the trip.
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I plan to hang with y'all as usual. Best, --David KM6RI
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Thanks, Aaron!??? Saving your emails in my notes.?? Also I'll pass along and discuss with WB3EFT (Bob Melville). ? --Connie
On Wednesday, January 15th, 2025 at 12:30 AM, Aaron Heller via groups.io <ajheller@...> wrote:
I hooked my tinySA up to my nanoVNA and it looks like the signal is at -10 dBm, 0.1 mW. I was just looking up requirements for spurious emissions for different project (testing the $10 1-3 W amplifier modules you find on Amazon and Ebay). It's covered in 47 CFR 97.307 (d) which says that for modern equipment operating below 30 MHz, spurs need to be no more than -43 dB relative to the carrier (dBc). So for a kilowatt PA (+60 dBm), that's 17 dBm or 50 mW. That's consistent with what Jeff said.
That said, it wouldn't be hard to confine the sweeps from the nanoVNA to the ham bands.
Aaron, AK6IM
On Fri, Jan 10, 2025 at 3:15?PM Jeff Reagan via <jeffreagan= [email protected]> wrote: Rules are more relaxed below 100 milliwatts, I'm pretty sure.
On Fri, Jan 10, 2025 at 1:51?PM Connie W6EFI via <stillinger= [email protected]> wrote: serious question ¨C ¨C if you sweep an antenna with a nanoVNA on frequencies outside of your license privileges, are you a lawbreaker?
I know there are some limits on power before licensing becomes an issue. and I'm pretty sure this was addressed on one of the licensing exams so now I've got some homework to do.
thanks again, 73 Connie W6EFI.
On Fri, Jan 10, 2025 at 13:31, Connie W6EFI via < stillinger@...> wrote:
I did not know that. That is definitely worth a cautionary note.
On Fri, Jan 10, 2025 at 13:12, Ron, N6YWU via <
ron.nicholson@...> wrote:
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX. Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
--
Connie KN2EFI
--
Connie KN2EFI
--
Connie KN2EFI
|
I will be at the Baylands starting with lunch.
I will be away for a cruise from Jan 24 through Feb 18, going from Hong Kong to Tokyo via Shanghai,Taiwan, Korea, Western Japan. I am not taking any ham equipment on board (prohibited).
Hiroki AH6CY
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I hooked my tinySA up to my nanoVNA and it looks like the signal is at -10 dBm, 0.1 mW.? I was just looking up requirements for spurious emissions for different project (testing the $10 1-3 W amplifier modules you find on Amazon and Ebay).? It's covered in 47 CFR 97.307 (d) ? ?? which says that for modern equipment operating below 30 MHz, spurs need to be no more than -43 dB relative to the carrier ?(dBc).? So for a kilowatt PA (+60 dBm), that's 17 dBm or ?50 mW.? That's consistent with what Jeff said.?
That said, it wouldn't be hard to confine the sweeps from the nanoVNA to the ham bands.?
Aaron, AK6IM
On Fri, Jan 10, 2025 at 3:15?PM Jeff Reagan via <jeffreagan= [email protected]> wrote: Rules are more relaxed below 100 milliwatts, I'm pretty sure.
On Fri, Jan 10, 2025 at 1:51?PM Connie W6EFI via <stillinger= [email protected]> wrote: serious question ¨C ¨C if you sweep an antenna with a nanoVNA on frequencies outside of your license privileges, are you a lawbreaker?
I know there are some limits on power before licensing becomes an issue. ? ?and I'm pretty sure this was addressed on one of the licensing exams so now I've got some homework to do.
thanks again, 73 Connie W6EFI.?
On Fri, Jan 10, 2025 at 13:31, Connie W6EFI via < stillinger@...> wrote:
I did not know that. That is definitely worth a cautionary note.
On Fri, Jan 10, 2025 at 13:12, Ron, N6YWU via <
ron.nicholson@...> wrote:
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX.? Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
--
Connie KN2EFI
--
Connie KN2EFI
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Fw: Request to register for Synopsis Championship : March 13, 2025
The annual science fair is looking for judges. It is totally amazing what the local students are doing.
I think this will be my 10th year and I can't wait for the next one.
Anyone
with a background in science, engineering or math.? The registration
will ask about your experience.? Likely first timers would be judging
junior high.?
Hope to see some of you on March 13th!
----- Forwarded Message -----
From: Science Fair Judging <judging@...> To: "aa6pz@..." <aa6pz@...> Sent: Monday, January 6, 2025 at 08:35:10 PM PST Subject: Request to register for Synopsis Championship : March 13, 2025
We invite you to encourage future scientists and engineers by participating as Category Judges at our Science and Technology Championship to be held on Thursday, March 13th, 2025. The Championship will be conducted IN PERSON in South Hall, San Jose Convention Center. Close to 800 students are expected to participate this year. Students in grades six through twelve, attending schools in Santa Clara County will demonstrate their research projects.
Both returning and new judges must register online at:
Don't forget to CLICK the "Register as a Judge" button after completing your registration form.
Judges who participate are required to be available IN PERSON during the ENTIRE duration of the Fair.? (12:00 to 6:00 PM PST). Judge Check-in opens at 10:30 AM and closes at Noon to allow time to preview the projects. Judges need a college degree in a field of science, engineering, technology, or math.
?
If you know of colleagues who are qualified and interested in judging, please forward this message to them. There will be a virtual training session to orient all our judges to the check-in procedures, professional conduct with students, and clarify your questions. Information regarding the orientation will be sent to registered judges to participate in the training session.
Further details, including the schedule and the Judging Guide, can be found at the Judge's link/webpage on our website:
If you have any questions, OR wish to be removed from our database, please email us at: judging@....
The Synopsys Championship encourages talented students to pursue careers in science and technology.? Please join us to share your passion for science and technology, in support of the next generation of local innovators! There are many opportunities to volunteer, and it all starts with just one afternoon as a Category Judge!
Thank you,
Aulena Chaudhuri, Ph.D.
Antonio Gallo, Ph.D.
Co-Chairs, Category Judging Committee`
Santa Clara Valley Science and Engineering Fair Association (SCVSEFA)
----
(This message was sent to Paul Zander at aa6pz@... )
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Rules are more relaxed below 100 milliwatts, I'm pretty sure.
On Fri, Jan 10, 2025 at 1:51?PM Connie W6EFI via <stillinger= [email protected]> wrote: serious question ¨C ¨C if you sweep an antenna with a nanoVNA on frequencies outside of your license privileges, are you a lawbreaker?
I know there are some limits on power before licensing becomes an issue. ? ?and I'm pretty sure this was addressed on one of the licensing exams so now I've got some homework to do.
thanks again, 73 Connie W6EFI.?
On Fri, Jan 10, 2025 at 13:31, Connie W6EFI via < stillinger@...> wrote:
I did not know that. That is definitely worth a cautionary note.
On Fri, Jan 10, 2025 at 13:12, Ron, N6YWU via <
ron.nicholson@...> wrote:
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX.? Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
--
Connie KN2EFI
--
Connie KN2EFI
|
serious question ¨C ¨C if you sweep an antenna with a nanoVNA on frequencies outside of your license privileges, are you a lawbreaker?
I know there are some limits on power before licensing becomes an issue. ? ?and I'm pretty sure this was addressed on one of the licensing exams so now I've got some homework to do.
thanks again, 73 Connie W6EFI.?
On Fri, Jan 10, 2025 at 13:31, Connie W6EFI via groups.io < stillinger@...> wrote:
I did not know that. That is definitely worth a cautionary note.
On Fri, Jan 10, 2025 at 13:12, Ron, N6YWU via groups.io <
ron.nicholson@...> wrote:
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX. ?Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
--
Connie KN2EFI
--
Connie KN2EFI
|
I did not know that. That is definitely worth a cautionary note.
On Fri, Jan 10, 2025 at 13:12, Ron, N6YWU via groups.io < ron.nicholson@...> wrote:
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX. ?Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
--
Connie KN2EFI
|
Random note: Sweeping an HF antenna with a nanoVNA is actually transmitting at around 10 dBm, which is enough power for WSPR encoding to get spotted by DX. ?Not sure what FCC requirements (licensed or not) apply to those transmissions.
73, Ron, n6ywu
|
Thank you! ?That's a good point about bandwidth which I hadn't thought of and I think I'll add that as a footnote to the speaker notes. ? ?
I sure do sympathize with your RFI problems.
Happy new year and thanks again!
73 Connie W6EFI?
On Fri, Jan 10, 2025 at 11:31, Cliff Sojourner K6CLS via groups.io < cls@...> wrote:
Connie, what a great presentation!?? I was able to understand it.? Thanks for sharing.
A couple things came to mind as I read through:
Resulting narrow bandwidth isn't a total con, some pros to that, such as reduced interference from nearby srong signals.
I tried measuring a random wire, but there was too much RF from nearby AM broadcast stations, so both my nanoVNA and my MFJ analyzer were overloaded.? Resulting measurements were nonsense.
Cliff
On January 9, 2025 9:10:28 PM PST, "Connie W6EFI via groups.io" <stillinger@...> wrote:
Hi Hiroki!??? CCing Rob KC6TYD who captains the A/V for PAARA.
FYI I will be repeating the presentation (actually giving a slightly updated one) at the San Mateo club meeting on Jan 17.
Also if I didn't already mention it, I'm putting stuff up on my github at
.?? The only thing up there right now is the most recent presentation.?? I'm updating it and there will be another version posted there on Jan 17.
Thanks,
Connie
On Thursday, January 9th, 2025 at 5:01 PM, Hiroki Kato <hiroki@...> wrote:
Connie,
Is video recording of your presentation available?
Hiroki AH6CY
that's two votes for scikit-rf! ? ?Definitely going to look into this. ¨C ¨C Connie.
On Wed, Jan 8, 2025 at 14:39, Christopher AI6KG <
ch@...
> wrote:
?which led me to the Python library scikit-rf.
?
I came across scikit-rf recently, too.? ? I've only scratched the surface with?it, but I agree,?it looks pretty great.? ?I need to get GPIB going again on my HP 8753A VNA.
73 de AI6KG
On Wed, Jan 8, 2025 at 11:28?AM Aaron Heller via
?
?<ajheller=
?
[email protected]> wrote:
?
Hi Connie... I also enjoyed your talk and chatting afterwards.? Thank you.?
It prompted me to review network analysis and scatter parameters, which led me to the Python library scikit-rf. It looks like it can do all the calculations needed for your technique (and then some).? It also interfaces to VNAs, like the NanoVNA, reads and writes Touchstone format files, makes Smith plots, and so forth.? I'm in the middle of making the "personality file" for my Z-match antenna tuner using a NanoVNA. Both turning elements are variable capacitors, so I'm having to eyeball the settings.?
I know folks at work who run Python programs on iPhones?using a Python app from the App store, so that might be a route to a smartphone implementation. Running it "in the cloud" on Google Colab?is another option (I have an acoustics package that many folks run that way).?
Here's some info on scikit-rf:
1. A. Arsenovic?
?
et al
?
., "scikit-rf: An Open Source Python Package for Microwave Network Creation, Analysis, and Calibration [Speaker¡¯s Corner]," in?
?
IEEE Microwave Magazine
?
, vol. 23, no. 1, pp. 98-105, Jan. 2022, doi: 10.1109/MMM.2021.3117139. ?url:?
?
?
?
?(I believe this is a free download. Let me know if you have trouble accessing it.)
2. scikit-rf: Object Oriented RF Engineering. ?url:
?
Best...
Aaron, AK6IM
On Sat, Jan 4, 2025 at 10:18?AM Connie W6EFI via
?
?<stillinger=
?
[email protected]> wrote:
?
thank you, Paul! It was fun and great to see you and other friends there.
Happy new year!
73,
Connie W6EFI
On Sat, Jan 4, 2025 at 08:45, Paul AA6PZ via
?
?<
?
aa6pz@...> wrote:
Connie,
?
That was a good talk last night.? It combined a new approach to a problem many hams have and you did it with a lively style.
?
Paul
?
--
?
Connie KN2EFI
?
--?
Connie KN2EFI
--
Connie KN2EFI
|
Connie, what a great presentation!?? I was able to understand it.? Thanks for sharing.
A couple things came to mind as I read through:
Resulting narrow bandwidth isn't a total con, some pros to that, such as reduced interference from nearby srong signals.
I tried measuring a random wire, but there was too much RF from nearby AM broadcast stations, so both my nanoVNA and my MFJ analyzer were overloaded.? Resulting measurements were nonsense.
Cliff
On January 9, 2025 9:10:28 PM PST, "Connie W6EFI via groups.io" <stillinger@...> wrote:
Hi Hiroki!??? CCing Rob KC6TYD who captains the A/V for PAARA.
FYI I will be repeating the presentation (actually giving a slightly updated one) at the San Mateo club meeting on Jan 17.
Also if I didn't already mention it, I'm putting stuff up on my github at .?? The only thing up there right now is the most recent presentation.?? I'm updating it and there will be another version posted there on Jan 17.
Thanks,
Connie
On Thursday, January 9th, 2025 at 5:01 PM, Hiroki Kato <hiroki@...> wrote:
Connie,Is video recording of your presentation available? Hiroki AH6CY
that's two votes for scikit-rf! ? ?Definitely going to look into this. ¨C ¨C Connie.
On Wed, Jan 8, 2025 at 14:39, Christopher AI6KG <ch@...> wrote:?which led me to the Python library scikit-rf. ? I came across scikit-rf recently, too.? ? I've only scratched the surface with?it, but I agree,?it looks pretty great.? ?I need to get GPIB going again on my HP 8753A VNA.
73 de AI6KG
On Wed, Jan 8, 2025 at 11:28?AM Aaron Heller via ??<ajheller= ?[email protected]> wrote: ?Hi Connie... I also enjoyed your talk and chatting afterwards.? Thank you.?
It prompted me to review network analysis and scatter parameters, which led me to the Python library scikit-rf. It looks like it can do all the calculations needed for your technique (and then some).? It also interfaces to VNAs, like the NanoVNA, reads and writes Touchstone format files, makes Smith plots, and so forth.? I'm in the middle of making the "personality file" for my Z-match antenna tuner using a NanoVNA. Both turning elements are variable capacitors, so I'm having to eyeball the settings.?
I know folks at work who run Python programs on iPhones?using a Python app from the App store, so that might be a route to a smartphone implementation. Running it "in the cloud" on Google Colab?is another option (I have an acoustics package that many folks run that way).?
Here's some info on scikit-rf: 1. A. Arsenovic??et al?., "scikit-rf: An Open Source Python Package for Microwave Network Creation, Analysis, and Calibration [Speaker¡¯s Corner]," in??IEEE Microwave Magazine?, vol. 23, no. 1, pp. 98-105, Jan. 2022, doi: 10.1109/MMM.2021.3117139. ?url:?????(I believe this is a free download. Let me know if you have trouble accessing it.)
2. scikit-rf: Object Oriented RF Engineering. ?url:?
Best...
Aaron, AK6IM On Sat, Jan 4, 2025 at 10:18?AM Connie W6EFI via ??<stillinger= ?[email protected]> wrote: ?thank you, Paul! It was fun and great to see you and other friends there.
Happy new year! 73, Connie W6EFI
On Sat, Jan 4, 2025 at 08:45, Paul AA6PZ via ??< ?aa6pz@...> wrote: Connie,?
That was a good talk last night.? It combined a new approach to a problem many hams have and you did it with a lively style.?
Paul?
--?
Connie KN2EFI?
--?Connie KN2EFI
|
Hi Hiroki!??? CCing Rob KC6TYD who captains the A/V for PAARA.
FYI I will be repeating the presentation (actually giving a slightly updated one) at the San Mateo club meeting on Jan 17.
Also if I didn't already mention it, I'm putting stuff up on my github at .?? The only thing up there right now is the most recent presentation.?? I'm updating it and there will be another version posted there on Jan 17.
Thanks,
Connie
On Thursday, January 9th, 2025 at 5:01 PM, Hiroki Kato <hiroki@...> wrote:
Connie,Is video recording of your presentation available? Hiroki AH6CY
that's two votes for scikit-rf! ? ?Definitely going to look into this. ¨C ¨C Connie.
On Wed, Jan 8, 2025 at 14:39, Christopher AI6KG <ch@...> wrote:?which led me to the Python library scikit-rf. ? I came across scikit-rf recently, too.? ? I've only scratched the surface with?it, but I agree,?it looks pretty great.? ?I need to get GPIB going again on my HP 8753A VNA.
73 de AI6KG
On Wed, Jan 8, 2025 at 11:28?AM Aaron Heller via ??<ajheller= ?[email protected]> wrote: ?Hi Connie... I also enjoyed your talk and chatting afterwards.? Thank you.?
It prompted me to review network analysis and scatter parameters, which led me to the Python library scikit-rf. It looks like it can do all the calculations needed for your technique (and then some).? It also interfaces to VNAs, like the NanoVNA, reads and writes Touchstone format files, makes Smith plots, and so forth.? I'm in the middle of making the "personality file" for my Z-match antenna tuner using a NanoVNA. Both turning elements are variable capacitors, so I'm having to eyeball the settings.?
I know folks at work who run Python programs on iPhones?using a Python app from the App store, so that might be a route to a smartphone implementation. Running it "in the cloud" on Google Colab?is another option (I have an acoustics package that many folks run that way).?
Here's some info on scikit-rf: 1. A. Arsenovic??et al?., "scikit-rf: An Open Source Python Package for Microwave Network Creation, Analysis, and Calibration [Speaker¡¯s Corner]," in??IEEE Microwave Magazine?, vol. 23, no. 1, pp. 98-105, Jan. 2022, doi: 10.1109/MMM.2021.3117139. ?url:?????(I believe this is a free download. Let me know if you have trouble accessing it.)
2. scikit-rf: Object Oriented RF Engineering. ?url:?
Best...
Aaron, AK6IM On Sat, Jan 4, 2025 at 10:18?AM Connie W6EFI via ??<stillinger= ?[email protected]> wrote: ?thank you, Paul! It was fun and great to see you and other friends there.
Happy new year! 73, Connie W6EFI
On Sat, Jan 4, 2025 at 08:45, Paul AA6PZ via ??< ?aa6pz@...> wrote: Connie,?
That was a good talk last night.? It combined a new approach to a problem many hams have and you did it with a lively style.?
Paul?
--?
Connie KN2EFI?
--?Connie KN2EFI
--
Connie KN2EFI
|
Connie, Is video recording of your presentation available? Hiroki AH6CY
toggle quoted message
Show quoted text
that's two votes for scikit-rf! ? ?Definitely going to look into this. ¨C ¨C Connie.
On Wed, Jan 8, 2025 at 14:39, Christopher AI6KG <ch@...> wrote:?which led me to the Python library scikit-rf. ? I came across scikit-rf recently, too.? ? I've only scratched the surface with?it, but I agree,?it looks pretty great.? ?I need to get GPIB going again on my HP 8753A VNA.
73 de AI6KG
On Wed, Jan 8, 2025 at 11:28?AM Aaron Heller via ??<ajheller= ?[email protected]> wrote: ?Hi Connie... I also enjoyed your talk and chatting afterwards.? Thank you.?
It prompted me to review network analysis and scatter parameters, which led me to the Python library scikit-rf. It looks like it can do all the calculations needed for your technique (and then some).? It also interfaces to VNAs, like the NanoVNA, reads and writes Touchstone format files, makes Smith plots, and so forth.? I'm in the middle of making the "personality file" for my Z-match antenna tuner using a NanoVNA. Both turning elements are variable capacitors, so I'm having to eyeball the settings.?
I know folks at work who run Python programs on iPhones?using a Python app from the App store, so that might be a route to a smartphone implementation. Running it "in the cloud" on Google Colab?is another option (I have an acoustics package that many folks run that way).?
Here's some info on scikit-rf: 1. A. Arsenovic??et al?., "scikit-rf: An Open Source Python Package for Microwave Network Creation, Analysis, and Calibration [Speaker¡¯s Corner]," in??IEEE Microwave Magazine?, vol. 23, no. 1, pp. 98-105, Jan. 2022, doi: 10.1109/MMM.2021.3117139. ?url:?????(I believe this is a free download. Let me know if you have trouble accessing it.)
2. scikit-rf: Object Oriented RF Engineering. ?url:?
Best...
Aaron, AK6IM On Sat, Jan 4, 2025 at 10:18?AM Connie W6EFI via ??<stillinger= ?[email protected]> wrote: ?thank you, Paul! It was fun and great to see you and other friends there.
Happy new year! 73, Connie W6EFI
On Sat, Jan 4, 2025 at 08:45, Paul AA6PZ via ??< ?aa6pz@...> wrote: Connie,?
That was a good talk last night.? It combined a new approach to a problem many hams have and you did it with a lively style.?
Paul?
--?
Connie KN2EFI?
--?Connie KN2EFI
|
Cliff Sojourner K6CLS
David W Crocker
David
Jeff Reagan