Hi all.. I have the 712c..300hz in my V and love it..I also have the 715c..2.8kc in the 455khz and pulled the OEM Collins..much better...The MD-100 works very well for me..73s Bob ===== 73s Bob W5RG since 1957 FT-1000MP V H.B. 8877s H.B. Yagis