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4hv.org :: Forums :: General Science and Electronics

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Radio Transmitter Kit

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LAN_403

Hon1nbo

Wed Dec 10 2008, 12:52AM

Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040

power adapters do not always filter, you have to check the label: if it is an AC output: no chance
if it is pulsed DC: needs to be filtered by a cap
most of those adapters do not include a filtering cap, so try that (even if a full-wave bridge rectifier is used, there is a point where the voltage drops to zero due to the AC line voltage inverting its sign, so you get a sorta half of a sine wave repeating itself...

coillah

Fri Dec 12 2008, 04:33AM

Registered Member #1517 Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304

OK! How can I do impedance matching on my antenna? I am trying to boost this signal.

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