Question about Length of Antenna and Loading on Circuit
 

Hi All

I have built the circuit on this website

http://braincambre500.freeservers.com/rss(1)(1)(1).htm

and the circuit diagram is he

http://braincambre500.freeservers.co...0schematic.gif


My question is this:

When I increase the antenna length to say 30cms, from the recommeded
6inchs or 15cms, the circuit does not work. Why is this? I know the
antenna captures RF signals and this current is fed into the circuit,
but I dont know why the circuit stops working - is it something to do
with overloading the circuit ?

Thanks for your time
Shelton.

Question about Length of Antenna and Loading on Circuit
 

Archimedes wrote:
When I increase the antenna length to say 30cms, from the recommeded
6inchs or 15cms, the circuit does not work.

The device is a super-regenerative receiver. The antenna
is part of the oscillator circuit. If you change the
length of the antenna, you change the resonant frequency
and/or possibly cause the oscillator to stop oscillating.
Either of those results will cause the receiver not to
work right.
--
73, Cecil http://www.w5dxp.com

Question about Length of Antenna and Loading on Circuit
 

The device is a super-regenerative receiver. The antenna
is part of the oscillator circuit. If you change the
length of the antenna, you change the resonant frequency
and/or possibly cause the oscillator to stop oscillating.
Either of those results will cause the receiver not to
work right.
--
73, Cecil *http://www.w5dxp.com

Hi Cecil

Thankyou very much for explaining that to me - yes i didnt know that
as a superregen, the antenna becomes part of the resonant circuit!

Thanks!
Shelton.