High Frequency Circuit Design TEXTS for SALE
High Frequency Circuit Design, Hardy, 360 pages
New Condition Excellent and Easy Read and Comprehend!
A duplicate from my library¡ $15.00 plus media shipped
ATC/ AVX Capacitor Handbook,,, Everything on RF Ceramic Caps
Loads of Application Guides
FREE¡ Will bundle with the Text¡ Total $20.00 FOR ALL.
PM ME OFF LIST IF INTERESTED, THANKS,
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Re: How do you measure a car antenna?
Document the issues.
Send a copy to the FCC.
If no action is taken, take the vehicle to the Green bank observatory and park it for a while.
That should get some attention.
Glenn
toggle quoted message
Show quoted text
On 8/27/2023 2:21 PM, Dragan Milivojevic wrote: Document your findings in a blog post and spread the word?
They will do nothing without media exposure.
On Sun, 27 Aug 2023 at 19:22, W0LEV<davearea51a@...> wrote:
I don't like to be the bearer of bad news, but the dealership has no idea
what RFI is. They know the words and there is a problem with some Jeep
models, but that's as far as they go. Experience follows:
While somewhat of an esoteric problem with RFI: the "Water Hole"
surrounding 1420.405751 MHz. This is the emission line of celestial and
deep space hydrogen designated by HI. The Water Hole is protected spectrum
by international agreement, including the US. Well,......., read on.
We have a 2018 Jeep JL Rubicon. It, of course, includes the capability of
serving as a hotspot for the internet and making cell phone calls. As
such, it contains a cell modem as part of the electronics behind the video
display in the dash. That modem operates at nominally 700 MHz (I've easily
detected its fundamental frequency output on the spectrum analyzer) . The
second harmonic screams out of the assembly and blankets the hydrogen line
such that I can not do radio astronomy on that frequency. It ceases
"looking for mommie" - finding a cell tower as we have no cell coverage at
home - after sitting untraveled for 3 or 4 days. Does it track my
travels? Absolutely yes, but that's a different problem.
I have four times contacted the local dealership where we bought the
vehicle. They have absolutely no inkling of what I'm talking about other
than recognizing the term "Radio Frequency Interference". I've sent Jeep
in Toledo - their engineering department - three letters documenting,
screen grabs, the interference both as captured on the spectrum analyzer of
the second harmonic of the cell modem and in the time domain from my
receiver as captured on the laptop at 1420 MHz (after some downconversion
and detection). There has been absolutely no response from them, either,
other than a form email "thanking me for my interest in Jeep".........which
we already own. Thanks, but no thanks!
Frustrated......? Yes.......! There are instructions online on disabling
the cell modem, but since we camp off-grid in many...many locations which
do not have any cell coverage or amateur repeaters, I'm reluctant to do
so. In addition, it involves literally taking the whole dash apart which
I'm not into attempting.
All I can communicate is, "good luck"........and, there really is no such
thing as "luck". YMMV......?
Dave - W?LEV
On Sat, Aug 26, 2023 at 11:49?PM Glenn Little<glennmaillist@...>
wrote:
Take it back to the dealer and insist that they fix the problem.
The problem is poorly designed and implemented inverters for the battery
and electronics.
It probably does not meet part 15 FCC rules for unintentional radiators.
Glenn
On 8/26/2023 12:59 PM, Donald S Brant Jr wrote:
If you are describing a problem with AM reception, it could be EMI from all of the inverters, etc. in the car, interfering with reception, rather
than an antenna issue. I had heard that car makers were trying to move
away from having AM to side step this issue. 73, Don N2VGU
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign:WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
--
*Dave - W?LEV*
--
Dave - W?LEV
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
|
Re: How do you measure a car antenna?
Document your findings in a blog post and spread the word?
They will do nothing without media exposure.
toggle quoted message
Show quoted text
On Sun, 27 Aug 2023 at 19:22, W0LEV <davearea51a@...> wrote:
I don't like to be the bearer of bad news, but the dealership has no idea
what RFI is. They know the words and there is a problem with some Jeep
models, but that's as far as they go. Experience follows:
While somewhat of an esoteric problem with RFI: the "Water Hole"
surrounding 1420.405751 MHz. This is the emission line of celestial and
deep space hydrogen designated by HI. The Water Hole is protected spectrum
by international agreement, including the US. Well,......., read on.
We have a 2018 Jeep JL Rubicon. It, of course, includes the capability of
serving as a hotspot for the internet and making cell phone calls. As
such, it contains a cell modem as part of the electronics behind the video
display in the dash. That modem operates at nominally 700 MHz (I've easily
detected its fundamental frequency output on the spectrum analyzer) . The
second harmonic screams out of the assembly and blankets the hydrogen line
such that I can not do radio astronomy on that frequency. It ceases
"looking for mommie" - finding a cell tower as we have no cell coverage at
home - after sitting untraveled for 3 or 4 days. Does it track my
travels? Absolutely yes, but that's a different problem.
I have four times contacted the local dealership where we bought the
vehicle. They have absolutely no inkling of what I'm talking about other
than recognizing the term "Radio Frequency Interference". I've sent Jeep
in Toledo - their engineering department - three letters documenting,
screen grabs, the interference both as captured on the spectrum analyzer of
the second harmonic of the cell modem and in the time domain from my
receiver as captured on the laptop at 1420 MHz (after some downconversion
and detection). There has been absolutely no response from them, either,
other than a form email "thanking me for my interest in Jeep".........which
we already own. Thanks, but no thanks!
Frustrated......? Yes.......! There are instructions online on disabling
the cell modem, but since we camp off-grid in many...many locations which
do not have any cell coverage or amateur repeaters, I'm reluctant to do
so. In addition, it involves literally taking the whole dash apart which
I'm not into attempting.
All I can communicate is, "good luck"........and, there really is no such
thing as "luck". YMMV......?
Dave - W?LEV
On Sat, Aug 26, 2023 at 11:49?PM Glenn Little <glennmaillist@...>
wrote:
Take it back to the dealer and insist that they fix the problem.
The problem is poorly designed and implemented inverters for the battery
and electronics.
It probably does not meet part 15 FCC rules for unintentional radiators.
Glenn
On 8/26/2023 12:59 PM, Donald S Brant Jr wrote:
If you are describing a problem with AM reception, it could be EMI from all of the inverters, etc. in the car, interfering with reception, rather
than an antenna issue. I had heard that car makers were trying to move
away from having AM to side step this issue. 73, Don N2VGU
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
--
*Dave - W?LEV*
--
Dave - W?LEV
|
Re: How do you measure a car antenna?
I don't like to be the bearer of bad news, but the dealership has no idea what RFI is. They know the words and there is a problem with some Jeep models, but that's as far as they go. Experience follows: While somewhat of an esoteric problem with RFI: the "Water Hole" surrounding 1420.405751 MHz. This is the emission line of celestial and deep space hydrogen designated by HI. The Water Hole is protected spectrum by international agreement, including the US. Well,......., read on. We have a 2018 Jeep JL Rubicon. It, of course, includes the capability of serving as a hotspot for the internet and making cell phone calls. As such, it contains a cell modem as part of the electronics behind the video display in the dash. That modem operates at nominally 700 MHz (I've easily detected its fundamental frequency output on the spectrum analyzer) . The second harmonic screams out of the assembly and blankets the hydrogen line such that I can not do radio astronomy on that frequency. It ceases "looking for mommie" - finding a cell tower as we have no cell coverage at home - after sitting untraveled for 3 or 4 days. Does it track my travels? Absolutely yes, but that's a different problem. I have four times contacted the local dealership where we bought the vehicle. They have absolutely no inkling of what I'm talking about other than recognizing the term "Radio Frequency Interference". I've sent Jeep in Toledo - their engineering department - three letters documenting, screen grabs, the interference both as captured on the spectrum analyzer of the second harmonic of the cell modem and in the time domain from my receiver as captured on the laptop at 1420 MHz (after some downconversion and detection). There has been absolutely no response from them, either, other than a form email "thanking me for my interest in Jeep".........which we already own. Thanks, but no thanks! Frustrated......? Yes.......! There are instructions online on disabling the cell modem, but since we camp off-grid in many...many locations which do not have any cell coverage or amateur repeaters, I'm reluctant to do so. In addition, it involves literally taking the whole dash apart which I'm not into attempting. All I can communicate is, "good luck"........and, there really is no such thing as "luck". YMMV......? Dave - W?LEV On Sun, Aug 27, 2023 at 5:22?PM W0LEV via groups.io <davearea51a= [email protected]> wrote: I don't like to be the bearer of bad news, but the dealership has no idea
what RFI is. They know the words and there is a problem with some Jeep
models, but that's as far as they go. Experience follows:
While somewhat of an esoteric problem with RFI: the "Water Hole"
surrounding 1420.405751 MHz. This is the emission line of celestial and
deep space hydrogen designated by HI. The Water Hole is protected spectrum
by international agreement, including the US. Well,......., read on.
We have a 2018 Jeep JL Rubicon. It, of course, includes the capability of
serving as a hotspot for the internet and making cell phone calls. As
such, it contains a cell modem as part of the electronics behind the video
display in the dash. That modem operates at nominally 700 MHz (I've easily
detected its fundamental frequency output on the spectrum analyzer) . The
second harmonic screams out of the assembly and blankets the hydrogen line
such that I can not do radio astronomy on that frequency. It ceases
"looking for mommie" - finding a cell tower as we have no cell coverage at
home - after sitting untraveled for 3 or 4 days. Does it track my
travels? Absolutely yes, but that's a different problem.
I have four times contacted the local dealership where we bought the
vehicle. They have absolutely no inkling of what I'm talking about other
than recognizing the term "Radio Frequency Interference". I've sent Jeep
in Toledo - their engineering department - three letters documenting,
screen grabs, the interference both as captured on the spectrum analyzer of
the second harmonic of the cell modem and in the time domain from my
receiver as captured on the laptop at 1420 MHz (after some downconversion
and detection). There has been absolutely no response from them, either,
other than a form email "thanking me for my interest in Jeep".........which
we already own. Thanks, but no thanks!
Frustrated......? Yes.......! There are instructions online on disabling
the cell modem, but since we camp off-grid in many...many locations which
do not have any cell coverage or amateur repeaters, I'm reluctant to do
so. In addition, it involves literally taking the whole dash apart which
I'm not into attempting.
All I can communicate is, "good luck"........and, there really is no such
thing as "luck". YMMV......?
Dave - W?LEV
On Sat, Aug 26, 2023 at 11:49?PM Glenn Little <glennmaillist@...
wrote:
Take it back to the dealer and insist that they fix the problem.
The problem is poorly designed and implemented inverters for the battery
and electronics.
It probably does not meet part 15 FCC rules for unintentional radiators.
Glenn
On 8/26/2023 12:59 PM, Donald S Brant Jr wrote:
If you are describing a problem with AM reception, it could be EMI from all of the inverters, etc. in the car, interfering with reception, rather
than an antenna issue. I had heard that car makers were trying to move
away from having AM to side step this issue. 73, Don N2VGU
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
--
*Dave - W?LEV*
--
Dave - W?LEV
-- *Dave - W?LEV* -- Dave - W?LEV
|
Re: How do you measure a car antenna?
I don't like to be the bearer of bad news, but the dealership has no idea what RFI is. They know the words and there is a problem with some Jeep models, but that's as far as they go. Experience follows: While somewhat of an esoteric problem with RFI: the "Water Hole" surrounding 1420.405751 MHz. This is the emission line of celestial and deep space hydrogen designated by HI. The Water Hole is protected spectrum by international agreement, including the US. Well,......., read on. We have a 2018 Jeep JL Rubicon. It, of course, includes the capability of serving as a hotspot for the internet and making cell phone calls. As such, it contains a cell modem as part of the electronics behind the video display in the dash. That modem operates at nominally 700 MHz (I've easily detected its fundamental frequency output on the spectrum analyzer) . The second harmonic screams out of the assembly and blankets the hydrogen line such that I can not do radio astronomy on that frequency. It ceases "looking for mommie" - finding a cell tower as we have no cell coverage at home - after sitting untraveled for 3 or 4 days. Does it track my travels? Absolutely yes, but that's a different problem. I have four times contacted the local dealership where we bought the vehicle. They have absolutely no inkling of what I'm talking about other than recognizing the term "Radio Frequency Interference". I've sent Jeep in Toledo - their engineering department - three letters documenting, screen grabs, the interference both as captured on the spectrum analyzer of the second harmonic of the cell modem and in the time domain from my receiver as captured on the laptop at 1420 MHz (after some downconversion and detection). There has been absolutely no response from them, either, other than a form email "thanking me for my interest in Jeep".........which we already own. Thanks, but no thanks! Frustrated......? Yes.......! There are instructions online on disabling the cell modem, but since we camp off-grid in many...many locations which do not have any cell coverage or amateur repeaters, I'm reluctant to do so. In addition, it involves literally taking the whole dash apart which I'm not into attempting. All I can communicate is, "good luck"........and, there really is no such thing as "luck". YMMV......? Dave - W?LEV On Sat, Aug 26, 2023 at 11:49?PM Glenn Little <glennmaillist@...> wrote: Take it back to the dealer and insist that they fix the problem.
The problem is poorly designed and implemented inverters for the battery
and electronics.
It probably does not meet part 15 FCC rules for unintentional radiators.
Glenn
On 8/26/2023 12:59 PM, Donald S Brant Jr wrote:
If you are describing a problem with AM reception, it could be EMI from all of the inverters, etc. in the car, interfering with reception, rather
than an antenna issue. I had heard that car makers were trying to move
away from having AM to side step this issue. 73, Don N2VGU
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
-- *Dave - W?LEV* -- Dave - W?LEV
|
Re: How do you measure a car antenna?
On 27/08/2023 03:44, fbray@... wrote: Unfortunately I can't see any photos. Maybe it's just me or maybe they need to be posted to the photos section? I don't know how the group is set up. Same here - they showed a little squares, a few pixels wide, and both appeared the same way and to have the same content. I use e-mail to access the group. Cheers, David -- SatSignal Software - Quality software for you Web: Email: david-taylor@... Twitter: @gm8arv
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Re: Not available at Ali Express / Zeenko
I have used Ali many times over the years, in particular Zeenko. I have never used my card but always PayPal and usually by messaging the young lady, whose name escapes me. She has always produced a Pp invoice and products have always been on point.
Just my personal experience but may help you.
--
It is better to help than hinder and judge.
Garry
M0MGP....GB6WLB (SES).....GB6NT? (SES)
M5C Contest Group
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Re: How do you measure a car antenna?
Craig-
My opinion- Electric vehicles are most likely considered an incidental radiator. They are exempted under ¡ì15.103 (a) provided harmful interference is not created
under ¡ì15.3 (m) Essential question is if interference to broadcast stations is considered harmful interference as defined in ¡ì 15.3 (m)
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Re: How do you measure a car antenna?
Unfortunately I can't see any photos. Maybe it's just me or maybe they need to be posted to the photos section? I don't know how the group is set up.
While it's hard to compare radios between vehicles, if your 4Runner had an external antenna -- the traditional metal rod -- it's understandable that that would probably work better than one that is in the glass. I recall reading about people installing a traditional antenna to improve reception in cars that came with those in the windshield or rear window.
It is also possible that the noise floor in the new Ford is much higher at AM band frequencies than it was in the Toyota. This could make it harder to receive a signal that weakens with distance.
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Re: How do you measure a car antenna?
At the risk of being slightly OT, there are several reasons that AM radios are disappearing. One is the EMI problem caused by various vehicle charging and propulsion systems. The EMI issue is a discussion topic on forums frequented by public safety and commercial two-way radio techs.
European car makers have dropped AM because it has been supplanted by DAB and AM stations are shutting down there, leaving little to listen to. Major US car makers disclaim any intention to abandon AM but we'll have to wait and see. In major US metro areas some of the AM stations are now simulcasting on FM so that they don't lose their audience.
Many of us have noted that the AM radios in older cars with traditional external metal rod antennas work better than the in the glass antennas.
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Re: Not available at Ali Express / Zeenko
I see all of the products listed. Please note that product visibility
depends on your
country of delivery. A year or so back I could not see any products in
his store unless
I changed my shipping country.
Your VIsa card problems are due to your card issuer/bank.
toggle quoted message
Show quoted text
On Sat, 26 Aug 2023 at 15:07, G4OJW <g4ojw@...> wrote:
Please note: lists Ali Express / Zeenko. This is no longer available, Zeenko is selling no products currently.
I tried ordering via Ali Express some months ago, a few days after successfully buying an AT-100M on Ali Express, to be told that they could no longer accept my Visa card, which has worked and still works for many years without any problems. I thus cannot recommend Ali Express in general thus with a 50% success rate only, as their systems are odd.
However, can the above page be updated, and are there any others that are not listed and reputable? The prices vary substantially, the Ali Express was the best price via Zeenko before.
Thank you
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Re: How do you measure a car antenna?
Ken, looking through FCC part 15 rules on emissions, I don¡¯t see any exemption for electric car motors or power systems. Do you have a reference to a FCC document for the exemption you mentioned?
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Re: NanoVNA Saver frequency axis weirdness
Okay wait, I see what's going on here. The frequency graduations don't really match the labels. What I took to be a vertical line at what is labeled 146.2 MHz is really lower than that frequency, assuming the frequency axis is truly linear (yes, Saver is set for linear).
Well, that was confusing. Thanks anyway Stan.
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Re: NanoVNA Saver frequency axis weirdness
Hi and thanks for getting back to me... On Sat, Aug 26, 2023 at 04:33 PM, Stan Dye wrote:
Note that the markers in nanovna-saver and the nanovna display are set
independently. Did you manually set those specific marker values in
Saver? Or were they automatically set by saver?
I manually set the markers in VNA Saver to match the markers set on the VNA - double checked this a bunch of times. Do the marker values on
the Saver data display screen match the ones you see, or the ones you typed
into this message? Marker settings everywhere match. See attached screen capture of entire Saver window. Markers 1 and 3 appear pulled towards the center relative to the frequency axis markings. Also attached is a GetScreenSE capture of the NanoVNA screen, the markers and graduations line up perfectly as expected. Saver's algorithm for setting the bandwidth markers for
the highpass may not be identical to the algorithm on the nanovna itself,
so it would not be surprising if they did not exactly match. I'm not sure I follow that. I know that some values start/stop will cause the marker frequency settings to move off of what I try to set them to. However, this does not appear to be the case or the markers I used with the sweep span at 1 MHz. The markers stay put where I entered them. Is this what you are referring to? In any case, the spots where the makers *appear* on Saver's frequency axis are so far off as to be a real problem IF that's where the makers really were. I'm relying on the markers being where the maker settings say they are. If that can't be achieved, thenI'll need to find some other gear to tune duplexers. ?\_(¥Ä)_/?
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Re: How do you measure a car antenna?
Take it back to the dealer and insist that they fix the problem.
The problem is poorly designed and implemented inverters for the battery and electronics.
It probably does not meet part 15 FCC rules for unintentional radiators.
Glenn
toggle quoted message
Show quoted text
On 8/26/2023 12:59 PM, Donald S Brant Jr wrote: If you are describing a problem with AM reception, it could be EMI from all of the inverters, etc. in the car, interfering with reception, rather than an antenna issue. I had heard that car makers were trying to move away from having AM to side step this issue. 73, Don N2VGU
--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIVwb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
|
Re: NanoVNA Saver frequency axis weirdness
Note that the markers in nanovna-saver and the nanovna display are set independently. Did you manually set those specific marker values in Saver? Or were they automatically set by saver? Do the marker values on the Saver data display screen match the ones you see, or the ones you typed into this message? Saver's algorithm for setting the bandwidth markers for the highpass may not be identical to the algorithm on the nanovna itself, so it would not be surprising if they did not exactly match. On Sat, Aug 26, 2023, 2:20 PM Larry Mollica AD6G <auubtab4b8@...> wrote: Sorry if this has been addressed already. I've made attempts to find some
discussion of this here but so far unable to track it down.
The frequency axis in NanoVNA saver (0.3.10-Win7, same for 0.3.8) & Python
3.7.9 appears to not agree across the graph with the markers. Please see
attached (High pass after.png). The frequency axis & markers appear correct
on the NanoVNA screen, they only disagree in NanoVNA Saver.
Markers:
1 = 146.19 MHz
2 = 146.5
3 = 146.79
Note that marker 1 appears to the right the graph's 146.2M. Marker 2 is
correct. Marker 3 is to the left of where it should be.
Is there some way to correct this? Thanks
|
Re: Trouble calibrating NanoVna Classic after upgrade to 1.2.20
You set me on the right path, Dragan. I went ahead and found the latest firmware for the Nanovna classic (not H), version 0.8.0, and it worked ok so I'll stick with that.
It is interesting that nobody else has reported any trouble getting the Nanovna classic to work with the DisLord H versions of the software. Probably something I'm doing but I'm going to leave well alone!
|
NanoVNA Saver frequency axis weirdness
Sorry if this has been addressed already. I've made attempts to find some discussion of this here but so far unable to track it down.
The frequency axis in NanoVNA saver (0.3.10-Win7, same for 0.3.8) & Python 3.7.9 appears to not agree across the graph with the markers. Please see attached (High pass after.png). The frequency axis & markers appear correct on the NanoVNA screen, they only disagree in NanoVNA Saver.
Markers:
1 = 146.19 MHz
2 = 146.5
3 = 146.79
Note that marker 1 appears to the right the graph's 146.2M. Marker 2 is correct. Marker 3 is to the left of where it should be.
Is there some way to correct this? Thanks
|
Re: How do you measure a car antenna?
That¡¯s great. Come up with a technology like EVs that appear to exempt from FCC interference standards, and make it ¡®acceptable¡¯ because it¡¯s ¡°¡good for the environment¡¡±. Any other electronics manufacturer would likely have to modify THEIR equipment so as to meet FCC requirements and not interfere with the radio spectrum. However, in this case it appears Electric Vehicle manufacturers are exempt from FCC interference standards, and as a result an entire broadcasting medium (AM broadcasting) is sacrificed and made to be obsolete. Nearly-gone are the days of AMBCB DXing, and pulling in stations from thousands of miles away. I¡¯m a dying breed. If one had conspiracy theorist tendencies, one might wonder if the action is deliberate so the 530 to 1710 kHz spectrum can be ¡°freed up¡± and offered to the highest bidder for other purposes. So much for my rant. Everyone have a great weekend. Ken From: BryonB Sent: Saturday, August 26, 2023 01:54 PM To: [email protected]Subject: Re: [nanovna-users] How do you measure a car antenna? Most of the biggest stations on the AM broadcast band around here are also simulcasting on the FM band and internet streaming now. They probably saw the trend happening in car radios before I did. It seems like there's a big push to get everyone to "stream" all their content online in North America now though. So if you're missing your AM station in the car and they don't simulcast on FM you may have to resort to either using a portable AM receiver (and discover if EV noise is in fact the real reason it's no longer there), or stream the station online. I personally stopped listening to political talk radio a few years ago and my blood pressure and anger management are both much better now. ?? My NanoVNA-F did help with tuning my dual-band mag-mount antenna on the car though. I wasn't looking to measure actual impedances with any precision though, just finding the low SWR tuning points. Because the mag mount antenna has the RG-58 coax cable directly attached, it would have been difficult to calibrate out that 15 feet or so of coax without taking it apart or making up another coax piece with the same type coax. -- --Bryon, NF6M
|
Re: How do you measure a car antenna?
Most of the biggest stations on the AM broadcast band around here are also
simulcasting on the FM band and internet streaming now. They probably saw
the trend happening in car radios before I did.
It seems like there's a big push to get everyone to "stream" all their
content online in North America now though.
So if you're missing your AM station in the car and they don't simulcast on
FM you may have to resort to either using a portable AM receiver (and
discover if EV noise is in fact the real reason it's no longer there), or
stream the station online.
I personally stopped listening to political talk radio a few years ago and
my blood pressure and anger management are both much better now. ??
My NanoVNA-F did help with tuning my dual-band mag-mount antenna on the car
though. I wasn't looking to measure actual impedances with any precision
though, just finding the low SWR tuning points. Because the mag mount
antenna has the RG-58 coax cable directly attached, it would have been
difficult to calibrate out that 15 feet or so of coax without taking it
apart or making up another coax piece with the same type coax.
--
--Bryon, NF6M
|
David J Taylor
Garry Champion
N7RWB Craig Cherry
BryonB