Mueller broadcast designs model T25-35SA Subaudible Tone Decoder

Description

These units are used but are in almost new condition, both cosmetically and functionally. These units are made to order by the manufacturer so there are very few of them on the secondary market. If you have use for 1 or if you think you might have use for one, here is your chance. I will post a more in depth description below. These units come with my FREE 30 day return/refund guarantee. If you have any questions please do not hesitate to contact me.
The Mueller Broadcast Design T25-35SA sub-audible tone decoder provides a simple and reliable way to detect the 25 and 35 Hz control tones sent by many satellite-delivered program networks. It is entirely self-contained and only requires audio and control hookups to your satellite receiver and equipment to be controlled.
The input is balanced and bridging, with a minimum impedance of 9.2 K ohms. This input is a true differential configuration, meaning that it will not introduce noise or other unwanted signals into your satellite audio. It will work equally well with balanced and unbalanced lines.
The detection circuits are bandpass filters which have a very narrow passband. The unit will detect on frequencies which are up to 3 Hz off (assuming a minimum tone level of -10 dB from program level), but the notch efficiency will degrade severely at these extremes. Normal tone rejection at the output is at least -20 dB, with as high as -45 dB possible if the tones are exactly on frequency.
The input level is not critical. If the output is 0 dBm nominal, the circuits are in the middle of the +/- 6 dB operating window. An easily-adjusted gain control inside the box allows input levels of -15 to +10 dBm. It is set at 0 dBm input when shipped. The output is active balanced at 0 dBm (600 ohms) nominal.