Great idea thanks! K6KWQ Dick Amps by "MORE POWER"
----- Original Message ----- From: "John Coleman" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" <amradio@mailman.qth.net> Sent: Thursday, February 28, 2008 2:57 PM Subject: RE: [AMRadio] Testing a modulator Hey Rick Put a 300 ohm resistor in series with the bottom leg of you parallel resistors then probe across the 300 ohm there will be about 1/10 the voltage therefore safer for you and the scope. 100 Watts into 3000 ohms would mean about 547 volts RMS (about 1320 volts peak to peak) across the whole load but only about 54 volts RMS (132 volts peak to peak) across the 300 ohm. John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of RICHARD GEORGE Sent: Wednesday, February 27, 2008 10:03 PM To: amlist Subject: [AMRadio] Testing a modulator How does one test a modulator. I will soon have a modulator capable of around 100 watts of audio. I know that I do not want to run the secondary of the transformer unloaded. Would it be OK to make dummy load out of a bunch of parallel connected 3 watt resistors, say about 60 watts worth at the dc resistance I will be looking at (3000 ohms). I know that this would only be good for short tests using my O scope and audio gen. Any better ways. I ran a lot of VHF AM back in the day, but only at 5 - 10 watt levels. K6KWQ Dick Amps by "MORE POWER" ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
