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Re: I need some Specs. about 345MHz guard system, can hlp me
Thank you everybody, These tips are very helpful for me.
I also have a question, how to test the sensitivity of this system?
For example, a communication system, we can use signal generator and error bit meter to buildup a test...
a alarm guard system, its operating frequency usually is 345MHz in USA, I only want to know how to test its RF feature, because I haven't the documents about it now, I want to get USA or ETSI spec to reference.
Thank you very much!!
datarate in 345mhz band
I very hope found some Specs to test rf factor about 345MHz guard system , can anyone will help me ?
Thank you!!!!!!!(urgency!!!!!!)
Re: LNA limiter(help!!)
in my opinion, it is possible but complex. You have to concern these factors including switch time of switch, response time of detector, I think you should confirm that microwave energy is can't spoil the amplifier in time that is sum of detector response time and...
Re: LNA limiter(help!!)
You can try to do as follows:
1) added a shunt diode at input part of your LNA, normally its onstate volt is about 0.3V, is equal to 0 dBm in dBm, if input power higher than 0 dBm then this diode will is in onstate to avoid to spoil transistor(or FET, HEMT) owing to...
Re: Z-LOAD
50Ω impedance is popular value in RF system, according to RF theory microwave signal is in travelling wave when natural impedance is equal to load impedance, so we desian a RF component by 50Ohm, because our product will used for a 50 Ohm popular RF system. if change 50 Ohm to other...
Re: SAW filter [hlp]
I think it is very important as follows:
1. how much is your out band attenuation?
2. Whether enough is your free space?
If use LPF+HPF to do a filter, i think need huge dimension to reach a acceptable performance.
By
Hi all,
I'm new here, I have strong interesting to know the some knowledge about Doppler radar used for guard system.
I only know a little about this, this radar consist of oscillator, antenna and mixer, operating frequency is about 24GHz, it transmitt a 24GHz microwave signal with proper...
Passerby
I think that the Power meter is more accurate on power measure, but in some case such as measure a signal with PAR, the spectrum analyzer is more better, this is my opinion.
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