Slot Machine Jammer Schematic – This section will list several functions that will allow you to build your own RF test equipment. Basic mechanical and electronic skills will be required in some projects, but the tools you can use will be equal to what the so-called “professionals” use. . Modulated Radio Equipment RSSI Based Signal Meter Simple Analog Field Power Meter Attenuator Pads Cable Reflection Tester 2.4 GHz Quarter-Wave Power Divider/Combiner Audio/Video Transmitter Link Test Funky Fresh® LED RF Signal Meter Spectrum Analyzer 2.4 GHz SWR Power Meter Reflection Loss Bridge Antenna Analyzer 3 GHz Prescaler Bias Tee Cellular Phone & GPS Jammers Simple VHF Power Amplifier Design 10.000 MHz Precision Frequency Standard 2.4 GHz to 700 MHz Converter 2.45 GHz Bandpass Filter 2.4 GHz Antenna/Feedline Analyzer 10. Analyze 2.4 GHz receiving converter circuit Various useful Homebrew Test Tools / RF Configuration Links
We modified the iwconfig command included in Jean Tourrilhes’ Wireless Tools for Linux slightly to help with wireless connection configuration and configuration. This is what the initial output of the iwconfig eth1 command will look like: eth1 RL2/Micro ISA NWID:0 Channel: 1 Link Quality: 2/2 Signal Level: 80/255 Noise Level: 0/0 Rx Bad nwid: 0 invalid crypt: 0 invalid misc: 0 Here is a screenshot of the modified version. It displays the same information, only with some lame ANSI colors and bar graphs for signal strength. I am not sure if it is correct, so use at your own risk. You can pick up this version here. There is also a version for 915 MHz WaveLANs. It includes the perl script pinger.pl, (screen shot) you can use this as a signal to help fix the antennas in your network. It’s just a wrapper around the ping command to display the millisecond output in an ANSI graph. It also has an option to use the ‘say’ command from the rsynth package to tell you the millisecond ping value. That’s useful for when you’re hanging on the roof trying to fix the antennas.
Slot Machine Jammer Schematic
Another way to check the signal strength received on Symphony’s wireless network is based on a homebrew signal meter. The National LMX2240 Intermediate Frequency Receiver has a certain pin called “RSSI Out”. RSSI stands for Relative Signal Strength Indicator and provides a voltage output. is an indication of the strength of the received signal. In a weak signal received the power of the RSSI is small and in a strong signal it is large. Unfortunately, this production is only during the part of receiving and off during transmission. This makes the RSSI output look like a series of spikes. To average from these spikes you can use a very common piece of test equipment in any good technician bench: a modulation meter. What? Are you talking? Modulation meter converts the received audio level into a DC voltage indicator. modulation, if you put RSSI spikes in the meter (and modify it ballistics) you will get a poor man’s meter. The meter I use is based on the Mark Weiss modulation met. yes. RSSI Signal Meter (38k PNG, 19k PostScript) RSSI Signal Meter Photo One RSSI Signal Meter Photo Two
The Illustrated Gpt 2 (visualizing Transformer Language Models)
This is a simple field strength meter that can be used to determine if your antenna is actually emitting energy. It is based on one from the ARRL UHF/Microwave Projects Manual, Volume 1 and can be used from 30 MHz to over 2 GHz if the field strength is easily measured (19k PNG, 10k PostScript)
You can also make some attenuator pads to help simulate real life signal loss when testing your wireless network connection. If you want, you can order commercial generators from Mini-Circuits that will handle 2 Watts of power, DC – 18 GHz, and have. built in SMA connectors for about $37 a piece. You can also connect attenuator pads to increase the overall volume. It is possible to use a longer length of high-loss cable, such as RG-174, as a conductor. Higher wattage resistors will handle higher RF power, although frequency response will suffer due to parasitic reactions. Low wattage resistors will handle high power if applied for short periods of time (milliseconds), as is common in many wireless network applications. Homebrew attenuator pads(37k PNG, 11k PostScript) GBPPR RF step attenuator schematic(29k PNG, PostScript) NEC UPG152TA GaAs MMIC SPDT RF switch datasheet(26k PDF) Pi and T attenuation pad design Order MECA attenuators online
This is a schematic for a homebrew cable reflection tester from the December 1996 issue of Electronics Current. It is very useful for checking coax cable runs for shorts or even impedance mismatches. It works by sending a pulse down the cable, then checking the return signal. oscilloscope. You can determine the distance to a short circuit or impedance mismatch using the distance = time x speed equation. Be sure to divide your time by 2, and keep in mind the speed of your belt. This is a schematic for a homebrew cable reflection tester from the December 1996 issue of Electronics Current. It is very useful for checking coax cable runs for shorts or even impedance mismatches. It works by sending a pulse down the cable, then checking the return signal. oscilloscope. You can determine the distance to a short circuit or impedance mismatch using the distance = time x speed equation. Be sure to divide your time by 2, and keep in mind the speed of your belt. USB monitor (22k PNG, 13k PostScript) Picture of USB monitor (57k PNG) Another TDR circuit and another TDR circuit
This is a device called a 2.4 GHz quarter-wave power divider/combiner. You can use this to connect two antennas together for increased gain or combine the input/output of an amplifier for increased power. It is possible to use the old 800 MHz mobile phone power distribution at 2.4 GHz due to the third harmonic interaction. 2.4 GHz quarter power distributor / combiner (18k PNG, 10k PostScript) Article for more power distributor / combiner ideas In a RLC Electronics 4-watt power distributor / combiner for 800 – 1000 MHz
Emp Generator Schematic
One of the best things to do is check the 2.4 GHz wireless connection using the $99 wireless audio/video transmitters from Radio Shack (part number 15-1971) they transmit about 1 mW at a frequency of 2.411, 2.434, 2.453, and 2.473 GHz. .They can even be changed for an external antenna output jack, like Symphony, and can produce their RF power increases to around 60 mW. Refer to this site for how to and setup for the change. You can use a portable CD player and a small sound system/speaker to verify that a 2.4 GHz connection is possible in the environment you are testing. . Connection test using wireless A/V transmitter (18k PNG) 2.4 GHz A/V transmitter external antenna for Radio Shack unit, which is slightly different. (10k PNG)
This is a high quality RF signal meter based on the Analog device AD8313 0.1 GHz – 2.5 GHz logarithmic detector IC. It can detect signals as low as -80 dBm. When combined with a 2.4 GHz or 915 MHz bandpass filter, it provides a quick visual reference to the amount of noise in the ISM band in the same area. It also makes a good optical tool for checking that your antenna is really strong. Funky Fresh® LED RF Signal Meter (29k PNG, 19k PostScript) Photo of Funky Fresh® LED RF Signal Meter AD8313 Data Sheet (267k PDF)
This is a homebrew spectrum analyzer that you can build using an old VCR tuner module. The frequency coverage will be around 80 MHz to 920 MHz and will vary somewhat with the tuner. It will also require an old oscilloscope that can X/Y mode and. A DC input to a receiver that can tune around 47 MHz AM and can be adjusted to tap its AM detector. It is possible to convert the 2.4 GHz signal down to VHF frequencies using a modified MMDS downconvter. This will allow you to check the 2.4 GHz signal with this probe. This works well and will be good to write in time… Notes: The display is not logarithmic, only about 10 MHz can be displayed at the same time, the symbols are big and fat n ‘due to the lack of a cable filter (a 45 MHz crystal IF filter from a mobile phone would fix this), VCR players have *a lot* of internal noise (at least mine does), Every VCR tuner I’ve tried is different in some way. VCR tuner based RF spectrum analyzer (123k PNG, 60k PostScript, or GIF) My Toshiba VCR tuner oscillator/configuration scheme VHF Lo response VHF Mid response VHF Hi response UHF response VCR tuner based RF spectrum analyzer hook-up graph (14k PNG ) step by step. Attenuator schematic(9k PNG) detector circuit concept Not logarithmic, (7k PNG) VCR tuner based RF spectrum analyzer photo A Spectrum Analyzer for Radio Amateur400k PDF from August 1998 by QST. A Spectrum Analyzer for Amateur Radio – Part 2200k PDF from the September 1998 issue of QST. The web page for the W7ZOI spectrum analyzer is on the QST W7ZOI/K7TAU Spectrum Analyzer built by N8QOH Schematic of the UHF only VCR tuner Picture of the VCR tuner, still on the VCR Another picture of the VCR tuner, still on.