In the past I used a soldering iron to loosen the solder holding the surface mount diode to the board, and that's a worrisome mix of shaky hands, teeny-tiny closely packed components and a hot soldering iron. The modification procedures for many HF rigs are available on the internet, and for modern Icom radios it usually means removing a diode from the main board to open up the transmit stage (opening up the receive side is usually not necessary). Even before I had it in-hand, I was thinking about doing the MARS mod myself. I've been haunting various ham radio equipment sale and swap sites for a while now, looking for a good deal on a used 7300, so when this one popped up I grabbed it. To date I've done it on two Icom IC-7100's, two Yaesu FT-891s and, before I got adventurous with a soldering iron, paid to have it done on an Icom IC-7200, a 7300 and a Yaesu FT-991A.Ī week ago, as part of my pure fleet initiative, I bought a used IC-7300 from a seller on QRZ.com. In past posts I've hinted that I'm not afraid to get into the gust of certain radios to do what is referred to as the 'Mars mod' open the radio up for wide band transmit for use on MARS and SHARES frequencies.
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