Field Strength Meter for 2.5Ghz Wireless LAN
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Make RadioLocman Your Homepage! All News Articles Schematics DataSheets Sites Prices Devices ru Advanced Search + 01-26-2010 Field Strength Meter for 2.4 Ghz Wireless LAN John Samin The original diode in the Microwave detector has been hard to find. I have found a supplier for the diodes.... Purchased here: http://www.xs4all.nl/~barendh/Cateng/Cateng_diode.htm Site Main Page : http://www.xs4all.nl/~barendh/Indexeng.htm This site has many GHZ rated Diodes you may want to check out... Here is a quote from the website: "Following point contact diode for Ghz usage are originally marked units. Being detectors for frequencies up to 12GHz depending upon type numbers these are also excellent noise sources, because of the extremely high cutoff frequency. Technical details are available on ordering. Stocked: 1N21B 1N21D 1N23ER 1N416B 1N416E from $3.58" What can you use to test how effective your antennas are for 2.4 Ghz? Which antenna has the best gain or, how do you know that there is any 2.4Ghz RF transmitted? Here are the details on how to build a general purpose 2.4Ghz Radio Frequency Field Strength Meter. This one was built using the microwave rated diode from a MICROTEK solid state microwave leakage detector (purchased from Dick Smith Electronics for around $24) these diodes can be more expensive than that if purchased in single units from electronics suppliers. There may be other suitable diodes available. Electronics stores also sell Schottky Hot Carrier Diodes that will probably also be suitable for this application. The antenna is a 2 element quad. I've orientated it in the diamond configuration so it should be effective for both horizontal and vertically polarised signals. You could build the antenna in the vertical or horizontal sense if you like. The antenna was constructed on a right angled BNC connector, however I'm sure you could come up with a different sort of plug setup that would still provide good results. Just keep the lead lengths to a minimum to reduce losses. I have used an attachment that allows the BNC connector to be inserted into my Voltmeter. I switch the Voltmeter to Millivolts, point it at the 2.4Ghz RF and read the result. The yellow plastic cylinder is used to keep the antenna separation at 10mm. I cut a channel into the plastic to allow the wire to sit tight, and pushed some liquid nails into the hole to hold it. The bottom of the reflector loop is held to the BNC connector with another dolop of glue. Contact Us Field Strength Meter for 2 4 Ghz Wireless LAN John Samin The original... http://www.radiolocman.com/shem/schematics.html?di=62425 1 av 3 2010-05-28 17:17
Transcript of Field Strength Meter for 2.5Ghz Wireless LAN
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01-26-2010
Field Strength Meter for 2.4 Ghz Wireless LAN
John Samin
The original diode in the Microwave detector has been hard to find. I have found a supplier for the diodes....Purchased here: http://www.xs4all.nl/~barendh/Cateng/Cateng_diode.htmSite Main Page : http://www.xs4all.nl/~barendh/Indexeng.htmThis site has many GHZ rated Diodes you may want to check out... Here is a quote from the website:
"Following point contact diode for Ghz usage are originally marked units. Being detectors for frequencies upto 12GHz depending upon type numbers these are also excellent noise sources, because of the extremelyhigh cutoff frequency. Technical details are available on ordering. Stocked: 1N21B 1N21D 1N23ER 1N416B1N416E from $3.58"
What can you use to test how effective your antennas are for 2.4 Ghz? Which antenna has the best gain or,how do you know that there is any 2.4Ghz RF transmitted? Here are the details on how to build a generalpurpose 2.4Ghz Radio Frequency Field Strength Meter. This one was built using the microwave rated diodefrom a MICROTEK solid state microwave leakage detector (purchased from Dick Smith Electronics foraround $24) these diodes can be more expensive than that if purchased in single units from electronicssuppliers. There may be other suitable diodes available. Electronics stores also sell Schottky Hot CarrierDiodes that will probably also be suitable for this application.
The antenna is a 2 element quad. I've orientated it in the diamond configuration so it should be effective forboth horizontal and vertically polarised signals. You could build the antenna in the vertical or horizontalsense if you like. The antenna was constructed on a right angled BNC connector, however I'm sure youcould come up with a different sort of plug setup that would still provide good results. Just keep the leadlengths to a minimum to reduce losses. I have used an attachment that allows the BNC connector to beinserted into my Voltmeter. I switch the Voltmeter to Millivolts, point it at the 2.4Ghz RF and read the result.The yellow plastic cylinder is used to keep the antenna separation at 10mm. I cut a channel into the plasticto allow the wire to sit tight, and pushed some liquid nails into the hole to hold it. The bottom of the reflectorloop is held to the BNC connector with another dolop of glue.
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Field Strength Meter for 2 4 Ghz Wireless LAN John Samin The original... http://www.radiolocman.com/shem/schematics.html?di=62425
1 av 3 2010-05-28 17:17
The detail of the antenna plugged into my Voltmeter.
Above is the antenna plugged into the Volt meter. It works pretty well, pointing it at the SUN also gets areading! Point it at the microwave oven and it will exceed the Millivolt scale! With a little work I'm sure youcould build a radar detector... I tuned the capacitor with a plasitc screwdriver to get maximum reading from a2.4Ghz RF source. You should use a Wireless LAN card as the source.
Field Strength Meter for 2 4 Ghz Wireless LAN John Samin The original... http://www.radiolocman.com/shem/schematics.html?di=62425
2 av 3 2010-05-28 17:17
Here is the schematic detail (not to scale), you should make the elements of the anntenna as close to thecorrect size as possible. This will ensure maximum energy is absorbed at 2.4Ghz. The elements should bespaced around 10mm apart. The antenna will display some gain and uni-directionality, so point the smallerantenna loop (driven element) towards the RF source you wish to measure. I tried connecting the antennadirectly to a microamp moving coil meter, however there was very little meter deflection from a Wireless LANcard. The electronic voltmeter is far superior.
mrx.com.au
Schematics on theme:
Electromagnetic Field Probe with Meter OutputHandheld 2.4 GHz Spectrum Analyzer. Part 1Handheld 2.4 GHz Spectrum Analyzer. Part 2One Watt 2.45 GHz Linear AmplifierDigital Capacitance Meter
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Field Strength Meter for 2 4 Ghz Wireless LAN John Samin The original... http://www.radiolocman.com/shem/schematics.html?di=62425
3 av 3 2010-05-28 17:17
