Re: Low Impedance Loop shootout 2

jdow

On 20210321 06:19:32, Paul Cianciolo wrote:

Bryon

The loop inductance is incredible small in both case.

The copper loop has a measured  inductance of 2 uh y and the mesh loop has .7 uhy

Distribute capacitance is  very low on both loops

For instance a resonant loop at 1Mhz the middle of the MF band here would need 235 uhy and a capacitance of 100 PF

Would an inductance of 2.35 uH and a capacitance of 1 nF work? (Well, one about 1.04 MHz with a Q somewhere in the stratosphere.

These loops are nowhere near that.

At 24 KHZ the inductance required is  75 millihenries and about 600 Pf capacitance.

So I think it is not a matter of resonance.

Also the received signal strength was always stronger on the mesh loop by at least 6 dB

If resonance was the responsible mechanism, you would see a peak at some point along the spectrum.

Was the SNR received any better on one than the other? Signal strength is not a good measure. It as often measures dynamic range degradation as opposed to SINAD readings at HF and below.

Perhaps others could chime in.

I think it has to do with the low AC resistance, impedance of the larger surface area conductor and its ability to provide a low loss conductor to the electromagnetic wave that cut into the conductor.

The skin effect may into the equation as well, at 20 KHZ   I am not sure how is the optimum that .032” conductor diameter  is.

It could be calculated but I am more of a builder than a calculator.

I can tell. {^_-} Of course, you do provide a valuable contribution. It's wheels on roads that make things move. All the theory can do is suggest which wheels might work better. Experimentation is needed to see if the theorists made useful assumptions to feed their equations.

{^_^}

Thanks for the comment.

PaulC

W1VLF

Check out my  Youtube Channel W1VLF

From: airspy@groups.io [mailto:airspy@groups.io] On Behalf Of BryonB
Sent: Sunday, March 21, 2021 2:54 AM
To: airspy@groups.io
Subject: Re: [airspy] Low Impedance Loop shootout 2

It seems like the self-capacitance of the two materials will be different, even with same loop circumference. So I think the two loops will have very different resonant frequencies without adjusting something to bring them to the same resonance point.

The observed received signal disparity between them on a given frequency then may just be taking notice if one is closer to being "peaked" on that frequency than the other, rather than saying the mesh is "better."

Am I missing something?

--
--Bryon, NF6M

locked Re: TVSharp Plug In Question

Bob Dengler

At 3/21/2021 04:47 PM, you wrote:
As I understand it, ATSC is proprietary and would require licensing.
That didn't stop the DSD+ folks from reverse-engineering the proprietary codecs for P25, DMR, D-Star & other DV modes.

Bob NO6B

locked Re: TVSharp Plug In Question

Joe M.

As I understand it, ATSC is proprietary and would require licensing.

Joe M.

On 3/21/2021 6:23 PM, Carl MacGentey wrote:
Near (far) as I can tell the TV Sharp plug in (TVSharp (rtl-sdr.ru))
<http://rtl-sdr.ru/category/tvsharp>handles Pal, secam and NTSC
transmission modes. What about the future? Is there any hope for all the
other remaining modes?

locked TVSharp Plug In Question

Carl MacGentey <CarlMacGentey@...>

Near (far) as I can tell the TV Sharp plug in (TVSharp (rtl-sdr.ru)) handles Pal, secam and NTSC transmission modes. What about the future? Is there any hope for all the other remaining modes?

IF Spectrum Plugin Question

rmrrgs

Hello,

Regarding the "IF Spectrum" plugin:

If I change, by dragging the edges, of the shadowed in bandwidth in the Spectrum view,
this change is reflected in the bandwidth shown in the plugin.

But not the other way.

Shouldn't changes done to the bandwidth shown in the IF Spectrum plug in then be reflected
in the bandwidth shown in the Spectrum view also ?

Bob

Re: Looking for Contour Shuttle plugin

Edward MacDonald

I am working on it currently. I am recoding all my SDR# plugins for .NET 5. I am about half way through.

Sure I could add Cycle frequency. I just need a bit more information on the implantation you have in mind.

On Sun., Mar. 21, 2021, 2:53 p.m. , <dwadi84@...> wrote:
Hi Edward, I have question if some progress was done to port plugin to latest SDR# support? I also have idea, will be good option if you add option to cycle frequency positions by using some programmed button.

Have nice day,

Re: Looking for Contour Shuttle plugin

Hi Edward, I have question if some progress was done to port plugin to latest SDR# support? I also have idea, will be good option if you add option to cycle frequency positions by using some programmed button.

Have nice day,

Re: Low Impedance Loop shootout 2

Paul Cianciolo

Bryon

The loop inductance is incredible small in both case.

The copper loop has a measured  inductance of 2 uh y and the mesh loop has .7 uhy

Distribute capacitance is  very low on both loops

For instance a resonant loop at 1Mhz the middle of the MF band here would need 235 uhy and a capacitance of 100 PF

These loops are nowhere near that.

At 24 KHZ the inductance required is  75 millihenries and about 600 Pf capacitance.

So I think it is not a matter of resonance.

Also the received signal strength was always stronger on the mesh loop by at least 6 dB

If resonance was the responsible mechanism, you would see a peak at some point along the spectrum.

Perhaps others could chime in.

I think it has to do with the low AC resistance, impedance of the larger surface area conductor and its ability to provide a low loss conductor to the electromagnetic wave that cut into the conductor.

The skin effect may into the equation as well, at 20 KHZ   I am not sure how is the optimum that .032” conductor diameter  is.

It could be calculated but I am more of a builder than a calculator.

Thanks for the comment.

PaulC

W1VLF

Check out my  Youtube Channel W1VLF

From: airspy@groups.io [mailto:airspy@groups.io] On Behalf Of BryonB
Sent: Sunday, March 21, 2021 2:54 AM
To: airspy@groups.io
Subject: Re: [airspy] Low Impedance Loop shootout 2

It seems like the self-capacitance of the two materials will be different, even with same loop circumference. So I think the two loops will have very different resonant frequencies without adjusting something to bring them to the same resonance point.

The observed received signal disparity between them on a given frequency then may just be taking notice if one is closer to being "peaked" on that frequency than the other, rather than saying the mesh is "better."

Am I missing something?

--
--Bryon, NF6M

_._,_._,_

You receive all messages sent to this group.

_._,__,_

Re: Low Impedance Loop shootout 2

BryonB

It seems like the self-capacitance of the two materials will be different, even with same loop circumference. So I think the two loops will have very different resonant frequencies without adjusting something to bring them to the same resonance point.

The observed received signal disparity between them on a given frequency then may just be taking notice if one is closer to being "peaked" on that frequency than the other, rather than saying the mesh is "better."

Am I missing something?

--
--Bryon, NF6M

Re: Aero. & Marine Digital Decoders (ADS-B, etc.) ?

Winston

Simon, Looking forward to testing with the Discovery and Elad S3.

More Complete Explanation Of AGC Usages, Please

rmrrgs

Hello,

Am trying to understand the AGC "screen".
I can discern no difference in what I hear from a relatively strong am station, e.g., if AGC is On or Off.

And, if On, changing the Threshold also seems to do nothing.

Read the description. in the manual writeup, but would really appreciate it is someone
could explain how, and when, the "USE AGC" and "Threshold" should correctly be used.   (And, the use of "Hang")

Also, in the Source "screen", there is a HFC AGC.  How and when, is this used ?

Is there an interplay between this AGC, and the other ?

Thanks,
Bob

Re: Using mouse to dial stations

Juan - EA5XQ

Hi Eddie

Thanks
--
Juan, EA5XQ
AirSpy Hf+ Discovery
MLA 30+ /  PA0RDT MiniWhip

Re: Centering Of Display ?

EB4APL

It rotates between the 3 tuning modes: Free ,Sticky and Center . Clicking with the left button goes in one sense and with the right button rotates backwards.

Ignacio EB4APL

El 20/03/2021 a las 18:23, rmrrgs escribió:
Hi,

Thanks for help.

I didn't realize that the centering icon has to be brought up by clicking on the icons, until
it appeared.

Couldn't understand why it wasn't appearing for me along the top, to simply just click on it..

Regards, and thanks again for help,
Bob
--
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
https://www.avast.com/antivirus

Re: Centering Of Display ?

rmrrgs

Hi,

Thanks for help.

I didn't realize that the centering icon has to be brought up by clicking on the icons, until
it appeared.

Couldn't understand why it wasn't appearing for me along the top, to simply just click on it..

Regards, and thanks again for help,
Bob

Re: Centering Of Display ?

EB4APL

Yes, the first icon to the right of the frequency digits is the tuning mode. Click on this until it is two arrows pointing to a central vertical line. This is the "Center tuning" mode.

Ignacio EB4APL

El 20/03/2021 a las 14:21, rmrrgs escribió:
Hello,

Really enjoying radio and software.

Is there some way to have the frequency I select via changing the digits
on the top always appear in the center of the display, automatically ?

Bob
--
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
https://www.avast.com/antivirus

Centering Of Display ?

rmrrgs

Hello,

Really enjoying radio and software.

Is there some way to have the frequency I select via changing the digits
on the top always appear in the center of the display, automatically ?

Bob

Re: Aero. & Marine Digital Decoders (ADS-B, etc.) ?

Simon Brown

Yes,

Simon Brown, G4ELI

From: airspy@groups.io <airspy@groups.io> On Behalf Of agene
Sent: 19 March 2021 21:20
To: airspy@groups.io
Subject: Re: [airspy] Aero. & Marine Digital Decoders (ADS-B, etc.) ? #plugins

Hi Simon,

That looks good on the Winradio Sigma, will the new SDR-Console work with the Winradio G39 as well?

Regards, Mike Simpson

South Penrith, NSW, Australia

Re: Aero. & Marine Digital Decoders (ADS-B, etc.) ?

Alberto I2PHD

On 2021-03-19 18:40, Simon Brown wrote:

Alberto,

Simon Brown, G4ELI

This works Simon, thanks.

--
73 Alberto I2PHD
<<< http://www.i2phd.org >>>

Vasili Plugin File (Player), link files.

Juan A.

Hello!
I try to link successive files and I am not able.
Could you help me?

--------------------------------------------------------
Juan Antonio Arranz Sanz

Low Impedance Loop shootout 2

Paul Cianciolo

Hello All,

Before I build the final version of my outdoor "LIL" I wanted to experiment with one more material, hardware cloth.
This video compares the 2 loops and determines which is the better material before the final outside build.
Here is a shootout between the original and the new version.

https://youtu.be/81HtbFcRfTA

W1VLF

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