Скачать или смотреть #50 - Audio-Technica ATW-D70 antenna distribution system modification

I needed an antenna and power distribution system for Shure wireless microphones, but Shure UA844 is too expensive, so I picked up a really cheap Audio-Tecnica ATW-D70. It is an old model with the frequency range of 728-750MHz, which is useless in the United States. I wanted to find out if it can be modified for use in the range of 470-698MHz, which was legal in the US for such purposes until recently, or at least 470-570MHz, which is going to stay legal going forward. I am talking about the FCC auction of the 600MHz band (570-698MHz). So it seems that such a modification is possible. Two filters (one per channel) need to be replaced, which was done. Frequency response after the modification was measured and was found acceptable.

Filter used: http://www.mouser.com/ProductDetail/T...