Dipole antenna - Page 2 - Electronic Circuits Projects Diagrams Free

sam2 · 5th February 2007, 11:55 PM

steve .I googled it and found quite a few descriptions on making your own filters. Thanks sam

bananasiong · 5th February 2007, 11:58 PM

Quote:

Originally Posted by Nigel Goodwin

It's fully sealed all the way round, and connected to the ground of the PCB - the only way signals can get to the board is then via the aerial socket.

Can this be made by shielding a box using alluminum foil?

**Nigel Goodwin** · 6th February 2007, 07:42 AM

Yes, but it's not as effective as a proper metal box.

sam2 · 3rd March 2007, 07:15 PM

I built a FM band stop filter I found on line and put the power supply and radio in a aluminum box and no more fm noise, and what static there was is very quite now. I dont even have to use the squelch.

It worked great at home but when I set it up at school( inside a metal hanger with a half wave dipole on the roof) I get the AWOS (atomated weather observing system) signal so strong that I can hear it three places on the dial and it blocks out most of the aircraft transmissions.
The AWOS transmitter is only about 200 yards away.

Can I build a filter that would block out just that( 134.75Mhz)frequency. It would be ok to block it out and above, because it is at the very top of the frequencies I want to hear. I can follow a schematic, but dont have any experience designing. Would a stub filter work?
Thanks, sam

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5th February 2007, 11:55 PM	(permalink)
sam2	steve .I googled it and found quite a few descriptions on making your own filters. Thanks sam

6th February 2007, 07:42 AM	(permalink)
Nigel Goodwin	Yes, but it's not as effective as a proper metal box. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

3rd March 2007, 07:15 PM	(permalink)
sam2	I built a FM band stop filter I found on line and put the power supply and radio in a aluminum box and no more fm noise, and what static there was is very quite now. I dont even have to use the squelch. It worked great at home but when I set it up at school( inside a metal hanger with a half wave dipole on the roof) I get the AWOS (atomated weather observing system) signal so strong that I can hear it three places on the dial and it blocks out most of the aircraft transmissions. The AWOS transmitter is only about 200 yards away. Can I build a filter that would block out just that( 134.75Mhz)frequency. It would be ok to block it out and above, because it is at the very top of the frequencies I want to hear. I can follow a schematic, but dont have any experience designing. Would a stub filter work? Thanks, sam