The SB-610 is a display to monitor “on the air” signals. The manual notes that the unit can be used from 160 to 6 meters without tuning or modification. Its primary purpose is monitoring the transmitted signal pattern; the RF envelope, RF trapezoid, or RTTY cross pattern. A rear-panel attenuator can accommodate any transmitter from 15 watts to 1 kilowatt. The SB-610 can also monitor the other station’s signal when connected to a receiver’s final IF amplifier stage, assuming the receiver IF has sufficient bandwidth. This unit came equipped with 3000-6000 KHz coils to match the 3395 KHz IF of Heathkit’s SB-line and HW-100 series.
Pre owned, in good condition see photos. Item NOT tested.
Sold as is, no refunds.