this is modulated grid dip meter dose the square wave attached to the base of q1 acts as RF signal generator ??? the freq of the above schematic is 295 mhz and the coil of q1 one for resonance and the other is antennaSome grid dip meters have a built in amplitude modulator so It can be used as an RF signal generator to troubleshoot receiver circuits.
no Sir it is 295 mhz receiver and the micro controller generate sound in the speaker due the received code and also generate square wave in hertz to modulate q1 what is the aim to modulate q1 bc548it is an amplifier for earth science the output band of interest is below 400 Hertz.
The delta t of interest between the 2 FG is the data log of the comparator.
using the Filipiak, Kopycki
Yes sir you are talking true I am sorry I did not follow with youJafal in a regenerative receiver the self quenching creates a waveform shown in figure 4b
The oscilloscope will identify if the circuit is regenerative.
As I said before the delta t is derived from comparator so it compares 10 Hz.
The study was completed and published in 1999.
Did you receive CW ? What did it say ?
thanks a a lot you are very genuases man after your paremission can you help after i do some tests and ask more if i am in need ?Yes, t=time, delta means the change. so delta t means the change in time.
The chosen bandwidth is 0-400 Hz so 10 works here. The delta t will appear as both the sum and difference. by mixing 10Hz with 258.2kHz
The first resonant circuit is LC it comes into resonance because 380uH and 1nH, = 258.2 kHz it is where L and C reactances are equal
Seen on a spectrum analyzer at 247.2 and 269.2 kHz so there is a 1 second delay through the ground compared to free space.
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