The LNA circuit I purchased is 5Mhz-6000Mhz and only needed 5V of power at the lowest setting. Here is the RF booster I built to work with my passive PSC shark fin antenna. We can use that same +20dB pcb circuit to overcome the RF loss in a 200ft BNC cable. Sidenote, Emmanuel’s original invention used a +20dB LNA RF amp to get 1600ft from his SMA modded G2 TX. We are limited to making inline RF boosters remember, so we are legally limited to buying and using LNA RF Amp circuits that don’t have the heatsinks.
The above circuit has a heatsink for taking a powerful signal from a transmitter.
You can buy it but just aren’t allowed to let those SMA ports touch your um400a. It’s that simple!īut remember we are in the United States, we can’t buy the above circuit legally for use with our wireless microphones. Drill a 7mm hole in your box for your SMA female ports to stick out of and use the lock washer to hold them in place. To make it look clean you can add some SMA extensions in case your project box is too big. And if you buy all the parts in the above list, well… Emmanuel claims he gets about a 1/2 mile range with this second generation RF Amp he built. Match your +/- and you are done! Right… thats not hard. The Output of the Voltage regulator can be soldered to a switch or directly to the RF Amp circuit. You will solder the In/Outs to each other so that the DC Input feeds the Voltage Regulator. And you are dealing with 12v instead of 1v Line Level audio. This is pretty basic signal flow but for power. WE WAKE UP AND WISH THEY WERE IN OUR KITCHEN SO WE COULD MAKE THEM PANCAKES*** ***NOTE DO NOT PLUG A TRANSMITTER INTO THIS RF AMP INSIDE THE USA! IT IS ILLEGAL UNDER FCC Part 74! AND WE RESPECT THE FCC. But when I found out this invention really doesn’t have a chance to come to market, well… game on! Our world of production sound is small, our local dealers are all great people, and our manufactures are for the most part family run companies who care about the end users. Normally I don’t like doing DIY projects that would 100% clone or “knock off” a manufactures product using the same suppliers they use. For those outside of the US and FCC control….
So… If you are based in the US the following photos and tutorial can only be used INLINE with your antenna and receivers for purposes of overcoming RF lose in lone cable runs. The same kind of RF booster we see in active antennas but now separate, mobile, and battery powered! If you were to put that circuit inline with an antenna and a receiver (exact same circuit) you would have a battery powered inline RF booster. Here is a link to FCC Part 74 – US Government Publishing Office According to the FCC it is illegal to make and sell a RF transmitter booster for any frequency: VHF, UHF, 2.4Ghz and market it towards wireless microphones but if you were to be a separate company and sell the EXACT SAME CIRCUIT and call it a WiFi booster or UHF DTV RF booster for better TV signals… totally legal. That project is scrapped” (End Fake Quotes) None of our audio dealers would be legally allowed to sell it or any other WiFi boosters, its a real mess. If we labeled it as a WiFi Booster it would have been legal but we can’t even do that because the FCC has labeled us an audio company. (Fake Quotes) “We aren’t legally allowed to sell it because Zaxcom 2.4Ghz gear is bidirectional and even the receiver is also transmitting. And while at NAB last month I spoke the owner of this audio equipment company and asked about the new booster. Over the course of the past 6 months in sourcing and learning all about these RF Amps it came to light that a audio equipment maker was going to be bringing this very product to market to boost 2.4Ghz transmitters. I bugged the snot out of him for all the details and plans. The whole sound mixer world went crazy! But within a month the world stopped caring about his invention… I didn’t. He was able to get 1600ft range and still had 3 bars on his RX. The original RF Booster was an LNA 20dB circuit and was used with a SMA modded G2. and getting 1600ft range for car to car monitoring. About a year Emmanuel Ombilod, a sound mixer in Singapore, posted a video and a few photos of a “homemade” RF Amp he was plugging a G2 TX into….
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