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From Free Knowledge Base- The DUCK Project: information for everyone
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The Whole House FM Transmitter 3.0 broadcasts a static free signal 150 feet in any direction. Compatible with most audio sources like TVs, Home Stereo Systems, iPods, Smartphones, MP3 players and computers. You will love the ability to broadcast your favorite music and audio sources to any FM radio. Integrates seamlessly with home and car stereos.* Frequency Range: 88.0 ~ 108.0 in 0.1 MHz steps* Pre-emphasis: US and EU Pre-emphasis Options* Frequency Response: 20Hz ~ 15KHz* Signal to Noise Ratio: >65dB* Audio Performance: 0.2% distortion* Stereo Separation: 40dB* Large Screen Interface: 1.34″ x 1.10″* Tuning Design: Stable PLL TechnologyPer the instructions, the power supply is not standard even though it looks like the same one as my Droid smart phone. They warn you not to use this supply on other items or any other supply with the phone.You need an RP-sma to BNC female adaptor to connect to coax cable or a better antenna.== improvements or modifications ==You are going to have to turn your remote stereo up to double the usual volume level, because if you try to turn up the volume level on the source device or try to turn up the "line in" volume on the unit, you are going to have terrible distortion. To sound its best, this unit requires a signal processor between the source and the transmitter. Either there is no AGC (Automatic Gain Control) circuit or it simply does not work well. A good AGC circuit would help address the common complaint of low audio volume or under deviation. A functional AGC would help to avoid over-modulation which is audio distortion. Instead, you have to turn the audio way down to about half way, thus making the unit transmit with much lower volume than broadcast stations.According to an Amazon review, "''there is no AGC in version 3.0. It was mentioned in the early instructions by mistake, and has been removed from the current instructions.'' "===audio processing / compression===Using computer software audio processing such as [https://www.thimeo.com/stereo-tool/download/ Thimeo Stereo Tool 10.10].Using a hardware audio processing device between the audio source and the transmitter.===antenna===Use the long wire antenna for best range. Try to run it as straight as possible, either vertically or horizontally although vertical polarization is probably best. If you run the unit on full power you will definitely want to use the wire antenna as the short telescoping antenna does not radiate well enough to protect the transmitter from reflected power which could cause damage.The wire antenna is 133½" long (the wire part) and including the screw base would be almost 134".* 133½" = 11' 1½" ''which appears to be a 1/2 wave'' for an end fed (long wire) antenna.