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Both the 19Khz pilot and the 38Khz L-R sub carrier rob RF power by taking up bandwidth to be transmitted so if they are set too high, noise is just one problem encountered. Sign up for a new account in our community. The FM02 is pretty sensitive to that. PM went through, will talk at you tomorrow or when ever you are online, vatasheet a Happy Thanksgiving Mac: CMOS Technology file 1.

I cut one end of the rg58 and soldered the center diod to one side of the dipole and soldered the shielding to the other side. Nothing against the walwart tamer but I already have half the stuff for this and Radioshack is just 3 miles away. You have over 1. And yes, Merry Christmas!!! Well scratch that, I get decent enough sound when it’s hooked up to my iPad but the min I hook it up to any computer in the house it dataxheet like crap again.

I tried the FM02 but had problems just my unit, I know others have used them successfully, and ukewarrior has been very helpful with the group buys and support.

The FM transmitter will have excellent frequency stability if it uses a Phase-Locked-Loop circuit that has a crystal oscillator as its reference. Analog Layout Finger Size 4. You might have some luck with a tunecast, belkin or other short-range transmitter that’s designed to transmit from an iPod or similar mp3 player to a car radio.

Bh11415 want to use the transmitter on my yampp mp3 player www. FM02 help sound is horrible. It’s small, power efficient, yet customizable datasheeet onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. PLL takes a frequency of VCO, divides it into a lower frequency which can be compared with a stable reference oscillator.


Chattanooga’s a pretty big city — maybe there’s a store that has electronic parts that might be able to help you out. I’m not sure if it’s a 19kHz tone or what, but I will be looking into this over the next couple weeks when I have free time. Should I run to radio shack and grab ferrit beads for everything? Its possible you may have one that has the adjustment capacitor on Pin 19 from the factory. It is not solving it at all, it is merely “covering it up” but it is still there and will always be there until the pilot level is correctly adjusted.

Such as the lack of a low pass filter, DC shunt path for static buildup on antennas, inadequate RF bypassing on the supply rails and not enough buffering between the IC RF datashret and the final stage. I do not want anyone to get the wrong idea here, the Wall Wart Tamer was not designed to get rid of a transmitter, coax or antenna problems, it was designed to cleanup any unwanted AC from a Wall Wart.

Experimentation may be required in finding the value of the adjustment capacitor for the FM02 unit.

This is what I use, get it all at radio shack, use a perf board, bend the component leads to each other and solder them to complete the circuit. For good stereo, the audio frequency response of the FM transmitter must be flat to 53kHz.

I have incorporated this very good information into the FM02 wiki! Then we can take a look at how Vast has this BH chip configured for both the 19Khz pilot level if at all and the time constant components in the audio section to see where they have the internal processor’s attack and release times set at.

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Why not strive for optimum performance Did you check out the wiki for guidance? Unfortunately I can’t use this pc as it also acts as a server sending HD tv signals to 6 tv’s in my house. Crystal Oscillator – Oscillator that uses a crystal to generate a frequency.


This can immediately rule out the signal itself, and let you focus on ground loops and the like. A ferrite bead will help a little, but not enough to make a big difference. Of course the other way to check is with a deviation meter or modulation monitor and check for the 19Khz pilot tone level. You may have to hack it a bit and solder in a longer antenna to get the signal out to the street with it.

But at least everyone has a head start on things for next year. The FM02 draws around 75 ma. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic datashewt.

stereo Transmitter – Electronic Projects Design/Ideas – Community

I bh1145 never a fan of SMD electronics not because they are so tiny and hard to work with, but they are incredibly vulnerable to even light stresses of the PC board such as handling or minor bumps and such. Pre tin the cap leads so the solder will take faster and require less heat to do so.

Posted April 29, The reason why some transmitters using the BH chip have the hissing is because the pilot is left to run wild so that at further distances the stereo transmission will still be received at those datashdet distances than it would be when the pilot is adjusted to standard. Hooked it up and it’s about par for the corse now I hooked it up backwards and fried the whole thing.

It just seems there is no sweet spot in the volume.