Very cool. It would be cool to have it be able to transmit the data back over bluetooth or similar to be able to make antenna comparisons from a distance. You can make the same device to cover 0.1Ghz to 2.5Ghz with an Ad8313. Just wondering why use a 9V battery when 2x AA would do the job with no regulator?
Maybe not the exact one that is demo'ed, but certainly other low-cost RF field strength meters of similar design are commercially available (e.g. MFJ). I don't know whether it is useable in the way you want for pinpointing RFI in a car. That would likely depend on whether the RFI is strong enough near its source to move the meter. 73, -Lloyd
I had been experimenting with 3D-printing coil forms of different lengths, turns, and diameters, including dimensions that would accommodate that ferrite rod. Adapting the ferrite loop to try with the field strength meter was more-or-less an afterthought. It was not designed for that purpose or any particular purpose other than working out 3D print parameters. Thank you for your comment and question. 73, -Lloyd (wa4efs)
@@lloydsdemos7366 I am planning to construct similar meter soon based / inspired from your project. The coil form really got my attention however as I have a need from another project to keep same coil configuration but change ferrite rods and had never thought of 3D printing as option. I had hoped maybe the drawing file was common openly available.
Good luck with your project. I use FreeCAD. If you want I can send you the project file for that particular form as an example--However, it is only readable with FreeCAD Best regards, -Lloyd
Awesome upload 😎 If you were interested with only one frequency, for example 935mhz, what length and type of antenna would you use? I'm installing a ducted heater unit, that has a wireless wall thermostat, and the receiver out side on the unit. It'll be great if I could put the thermostat in a good spot. Your video has got me interested. Thanks from Australia!!
Thanks Richard! The AD8307’s documented range extends to 500 MHz. To detect RF activity at 935 MHz, probably easiest and least expensive would be a USB plug-in RTL-SDR that covers the target frequency. A small wire antenna should work. If greater sensitivity is needed, perhaps try a collinear design, similar to www.lloydm.net/Demos/ads-b.html, but with segment lengths calculated for 935 MHz. Good luck! -Lloyd
@@lloydsdemos7366 I bought a k18 rf gs detector , I want to make an exact length antenna to pickup the 935mhz, instead of using the rubber duck supplied, to hopefully limit pickup other signals. Online calculator says 33cm. I'm gonna experiment. Have you got any tips? Cheers buddy. I will be an installer if these ducted heaters in the near future. So just trying to avoid going back to customers if they loose signal because thermostat was installed on borderline! Unfortunately, there is no bar signal strength indicator on the thermostat, so pot luck where I put it. Thanks!
@@richardday2893 I'm not familiar with that particular unit Richard, but specs say 1MHz to 6.5GHz--cool. Sorry I don't have anything useful to add on the antenna. Hope it works for your application! --Regards.
Using the same circuit with a Ad8313 brings the range from 0.1Gz to 2.5Ghz. For improved sensitivity, use a 1/4 wave antenna cut for 1/4 of the wavelength of the desired frequency. You can start to get fancy with the antennas but if the box had a metal ground like the one in the video it will suffice as a general ground plane / counterpoise for the antenna. To calculate the 1/4 it's a simple formulae using speed of light but there are online calculators so just use one of those. To tune the antenna in a real world situation it's best to use a VNA but for rx (receive) you only really need to be in the ball park re length. Of just buy a pre made which are notoriously bad for being out of tune due to the bad manufacturing or from the plastic covers over the wire antenna that change the parameters of the antenna.
Very cool. It would be cool to have it be able to transmit the data back over bluetooth or similar to be able to make antenna comparisons from a distance.
You can make the same device to cover 0.1Ghz to 2.5Ghz with an Ad8313.
Just wondering why use a 9V battery when 2x AA would do the job with no regulator?
Can we buy it ready build ? And from where ? Will it help me locate rfi in my car ? Best 73s, SY1DAL Jimmy
Maybe not the exact one that is demo'ed, but certainly other low-cost RF field strength meters of similar design are commercially available (e.g. MFJ). I don't know whether it is useable in the way you want for pinpointing RFI in a car. That would likely depend on whether the RFI is strong enough near its source to move the meter. 73, -Lloyd
Nice project and presentation! I’m curious of the ferrite rod coil form, never seen or thought of this before, did you design or find plans somewhere?
I had been experimenting with 3D-printing coil forms of different lengths, turns, and diameters, including dimensions that would accommodate that ferrite rod.
Adapting the ferrite loop to try with the field strength meter was more-or-less an afterthought. It was not designed for that purpose or any particular purpose other than working out 3D print parameters.
Thank you for your comment and question. 73, -Lloyd (wa4efs)
@@lloydsdemos7366 I am planning to construct similar meter soon based / inspired from your project.
The coil form really got my attention however as I have a need from another project to keep same coil configuration but change ferrite rods and had never thought of 3D printing as option. I had hoped maybe the drawing file was common openly available.
Good luck with your project. I use FreeCAD. If you want I can send you the project file for that particular form as an example--However, it is only readable with FreeCAD
Best regards, -Lloyd
Awesome upload 😎
If you were interested with only one frequency, for example 935mhz, what length and type of antenna would you use? I'm installing a ducted heater unit, that has a wireless wall thermostat, and the receiver out side on the unit. It'll be great if I could put the thermostat in a good spot. Your video has got me interested. Thanks from Australia!!
Thanks Richard! The AD8307’s documented range extends to 500 MHz. To detect RF activity at 935 MHz, probably easiest and least expensive would be a USB plug-in RTL-SDR that covers the target frequency.
A small wire antenna should work. If greater sensitivity is needed, perhaps try a collinear design, similar to www.lloydm.net/Demos/ads-b.html, but with segment lengths calculated for 935 MHz. Good luck!
-Lloyd
@@lloydsdemos7366 I bought a k18 rf gs detector , I want to make an exact length antenna to pickup the 935mhz, instead of using the rubber duck supplied, to hopefully limit pickup other signals. Online calculator says 33cm. I'm gonna experiment. Have you got any tips? Cheers buddy. I will be an installer if these ducted heaters in the near future. So just trying to avoid going back to customers if they loose signal because thermostat was installed on borderline! Unfortunately, there is no bar signal strength indicator on the thermostat, so pot luck where I put it. Thanks!
@@richardday2893 I'm not familiar with that particular unit Richard, but specs say 1MHz to 6.5GHz--cool.
Sorry I don't have anything useful to add on the antenna. Hope it works for your application! --Regards.
@@lloydsdemos7366 Using the same circuit with a Ad8313 brings the range from 0.1Gz to 2.5Ghz
Using the same circuit with a Ad8313 brings the range from 0.1Gz to 2.5Ghz. For improved sensitivity, use a 1/4 wave antenna cut for 1/4 of the wavelength of the desired frequency. You can start to get fancy with the antennas but if the box had a metal ground like the one in the video it will suffice as a general ground plane / counterpoise for the antenna.
To calculate the 1/4 it's a simple formulae using speed of light but there are online calculators so just use one of those. To tune the antenna in a real world situation it's best to use a VNA but for rx (receive) you only really need to be in the ball park re length. Of just buy a pre made which are notoriously bad for being out of tune due to the bad manufacturing or from the plastic covers over the wire antenna that change the parameters of the antenna.