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I'm agree with QRN. If the antenna ground was bad, then the coax was providing the RF ground and the chassis ground was now seeing a lot of localized RF which probably caused the hum.

QRN, I understand what you are saying, but the probability of a scenario occurring as described is almost nill and if it does, very few if any electrical circuits will work correctly anyway - such as the starter solenoid. Then there is the fact that are numerous other paths back to the battery...

Maybe, but I doubt it. It is more likely the lights saw a voltage that was greater than what they were designed for. When discreet power/ground paths exist within numerous connected systems, the voltages seen at various connection points can be smaller than ideal, close to ideal, or greater...

Re: viking Its an antenna tuner, not a radio, so you don't need it unless you are trying to drive an antenna that has a different feedpoint impedance than 50 ohms. Th link Beetle provided tells how to set it up.

karo, the diode will be forward biased when the power leads are reversed, and since the diode is located across the power lines with no current limiting, the fuse will blow whether it is located in the positive lead or negative lead - it doesn't matter. QRN, the entire vehicle electrical...

Since current needs a complete path to flow, the fuse can be in either the (+) or (-) power leads because both wires will see the exact same current, unless there is a ground fault. However, putting the fuse in the (-) line will not protect the equipment from reverse polarity any better...

Re: Judge throws out case against ham (not FCC related direc

Replace the connectors with a polarized plug or use different individual connectors for the (+) and (-) connections...

Larry, the part in question looks like an air dielectric variable capacitor to me, not a roller inductor. So, the part that is missing was probably a capacitor added across some of the plates to increase its base value. But it is very hard to tell from the picture...

The biggest issue with overmodulation is that the PEP should never exceed four times the carrier power (100% Modulation) or the envelope will have square wave harmonics generated in the area between the enevelope peaks. This creates severly distorted audio audio at the receivers envelope...

agreed... :)

If the metering circuit is a moving needle analog type, which the Bird 43 is, then the meter is typically most accurate towards the low end near mid-scale. When an analog meter movement moves towards the high end, the coils tend to saturate and the springs become non-linear. This is why the...

I agree, inaudible intelligence... 8) freecell, I knew we would find some common ground. :D

If its part of a tuned circuit, possibly, but I doubt it if the transmitter has a crystal oscillator and PLL. If the inductor is part of the DC filtering, it might affect the signal mixing since the power supply might be noisier.

I understand the secondary side of the transformer is acting as the output source to the antenna and its voltage/impedance is a function of the input, turns ratio, core material, and input/saturation current. I do understand a boost power supply is not needed, though I would use one to increase...

DTB Radio, I understand the voltage will be approximately 71 Vrms, but this value is still 100 Vpk for a 100W PEP swing and for that to occur, the modulating voltage needs to be 77.63 Vpk with a carrier voltage of 22.36 Vpk - assuming a 5W carrier. Can you imagine the splatter and distortion...

skirtchaser, I'm with you... preacherman, do you realize that the peak voltage out of the radio would need to reach 100V in order to generate 100W PEP... How is a stock radio powered by approximately 13.7VDC able to accomplish this? I admit, I do not know anything about this particular...

Yep... :)

I see you added my Average Power and PEP equations with some incremental results to your web page... Did you figure out how I derived them? 8)

Technically there is no such thing as taking the RMS value of power - I agree. However, the prefix of RMS has been traditionally used to designate the metrics used in the calculation of power. So True Power, or Average Power, calculations are only correct when RMS values are used. If...