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RF Meter for Multimeter

Replica Designer Handbags Hello scientists, makers and people with high quality replica bags free time. Let’s turn our ordinary digital multimeter into an RF field strength meter (FSM). The FSM we are going to make is a very simple one that we will use to detect the relative RF power being transmitted from an antenna and plot its field. Since I am a licensed amateur radio operator this is designed to be used with HAM radios in mind. It may be possible to do the same for a 802.11 WiFi transmitter but because of the low power of WiFi you may need to amplify the signal before the meter.2 1N60 Diodes 1 0.05uF Ceramic Capacitor 1 470pF Ceramic aaa replica bags Capacitor 1 0.01uF Ceramic Capacitor 1 50K Potentiometer 2 banana plug 1 1′ 2′ Antenna or stiff wire 2 replica bags online 1′ people of wire 1 Digital MultiMeter The capacitors https://www.replicahandbagsforu.com can be of close values but the diodes need to be germanium diodes (1N60 in this case) as these have a low voltage drop of about 300mV instead of the usual silicone diode drop of about 700mV. Replica Designer Handbags

Wholesale Replica Bags The potentiometer will allow us to better adjust the sensitivity of the meter as replica designer bags wholesale you will see best replica designer bags later. Wholesale Replica Bags

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Fake Handbags RF is an luxury replica bags AC wave, as the RF is collected by the antenna it passes through the first capacitor. Capacitors allow the RF (because its AC) to pass through and will block any DC voltage that may exist on the antenna. Next the RF replica designer backpacks comes into contact with the diodes, these high end replica bags are arranged in a half wave rectifier configuration meaning that all the positive RF voltage will remain and all the negative RF good quality replica bags voltage will go to ground. Next we encounter a capacitor again and this will filter and buy replica bags smooth out a bit of our RF voltage turning it into more of a DC voltage. We now get to our pot and this acts as a voltage divider and allows us to control how much voltage gets replica bags china to our multimeter. Immediately after replica bags from china our pot we encounter one final capacitor that will again high replica bags filter, smooth out the voltage that is about best replica designer to head to our multimeter. Fake Handbags

wholesale replica designer handbags Being that this is not a calibrated test equipment the voltage doesn’t actually mean that at say 3 feet you are putting 7V on the air but it’s more of a bag replica high quality relative representation of the RF field you are generating in that area. What radio you do use be sure to use it at its lowest power because you will be very close to the antenna and you want to limit the RF designer replica luggage that you will be absorbing into your body. wholesale replica designer handbags

aaa replica designer handbags First if the antenna is a omni directional antenna stand far enough away from the antenna that you get about a volt (adjust the sensitivity if you need to). high quality designer replica If the antenna is directional/beam antenna you again want to move back till you are reading about 1V on transmit at main lobe. Most multimeters have a MAX function on them. This allows best replica bags online you to take a reading and it will display and hold on the replica bags buy online peak voltage that it received. aaa replica designer handbags

high quality replica handbags With the multimeter on MAX voltage and radio take a look at the site here and FSM in hand, start transmitting for about 1 2 seconds. Now read and buy replica bags online mark down the best replica bags voltage. Now move around the antenna about 45 degrees from where you started and again transmit for replica bags 1 2 seconds and get the voltage from that point. When you move around keep the same distance between the FSM and the feed point of the antenna. Also hold the FSM so that its antenna’s broadside is facing the antenna. This because the tips of an antenna don’t receive RF and it’s only the length of the antenna that does. Attached to this step you will find a printable polar graph paper replica designer bags that you can use. And because the antenna is 7a replica bags wholesale left and right symmetrical we can fill out replica wallets the remaining numbers like so: high quality replica handbags.

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