Radio Regenerator for communication over long distance

[Laurynas]

Hi,

Looking for brief explanation about Radio regenerator and communication over long distance and maybe someone could write example where and how it is used.

Thanks

 

[topquark]

This is a forum for electricians, NOT electronics engineers.

 

[SJD]

I suspect you are looking for information about Radio repeaters, for example commonly used in the amateur radio world. As said, wrong forum, try wikipedia as a starting point.

 

[Laurynas]

Oh, sorry then..

 

[Moses]

Hi,

Looking for brief explanation about Radio regenerator and communication over long distance and maybe someone could write example where and how it is used.

Thanks

Are you asking about regenerative receivers?

 

[Laurynas]

Moses,

yes I am looking for that.. Maybe you can help me??

 

[Philpot]

Hi I just googled your question and there is a great deal of info on the subject. The Wiki Answers site said:-

When any digital signal is transmitted over a pair of wires, it degrades in amplitude. Regenerative repeaters receives the incoming signal, extracts the clock, then regenerates the original signal as a clean digital square wave as if it was the original signal transmitted from the source. Thus the name repeater Read more: What advantage do regenerative repeaters have when used for digital communication

It depends upon what you are trying to do. The Ham Radio repeaters are a transmitter that receives on one frequency and then re-transmits on a another , shifted by a set repeater shift.
You may have seen microwave dishes on a pole with a back to back dish that act as a repeater to get a signal over, say a mountain of hill.

Your best source may be Google and than you can tailor your search to exactly what you need.

Philpot






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[Laurynas]

Thanks, I will try.

Thanks for answers

 

[Moses]

Moses,

yes I am looking for that.. Maybe you can help me??

Regenerative receivers provide a surprising level of performance with only a handful of components. They excel at receiving amplitude modulated signals from below the AM broadcast band up to the higher short-wave bands above which the superregenerative detector becomes the better choice. Many designs for regenerative receivers are available and most will do a fine job. The regen is basically an oscillator circuit with a gain control that allows the user to adjust the feedback to a point just below oscillation or, quite often, just above the critical level such that a small oscillation is present. The typical regen uses a tapped coil or additional windings to connect into the tuning tank and the tuning capacitor provides the total tank capacitance. The advantage to this approach is that the tuning range is maximized since there are no fixed capacitors contributing to the tank. The disadvantage is that special, hand-made coils are required. The regens shown below use capacitive taps to achieve the required feedback and, as would be expected, the tuning range is restricted to about two to one. For example, the AM broadcast band would require two inductors to tune, perhaps from 500kHz to 1MHz and 900kHz MHz to 1.8MHz. This disadvantage really isn't all that important when one considers the advantage of being able to use factory-made molded inductors! If a multi-band receiver is constructed, there will be a couple more band switch positions. Actually, the lower tuning range makes fine-tuning a little easier which is critical for achieving the maximum performance.
The basic receiver is shown below. The components are not critical and the values were pretty much the first ones found on the bench that were near the "right" value so don't hesitate to experiment. The transistor could be just about any small-signal NPN including the 2N4401, 2N3904, 2N2222, or others. The audio output is fairly weak and will need an amplifier to drive headphones or a speaker.