Power supply to Mark-antennas. Suitable to 4-10 radio- or TV-outlets. The PSA 30V-2 is normally used when a higher gain is required on AM together with a passive AM antenna or Mark 30/32CA. The PSA 30V-2 is the preferred unit in most radio and TV systems. It is similar to PSA 30V-1 but has AM feed through instead of an AM amplifier. This is to achieve best possible results when used together with an active AM antenna such as the VPA 30.