SB-610 * 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. Monitoring for another IF such as 455 KHz would require substituting the proper coil in the vertical amp plate circuit. Heath originally provided such coils along with instructions in the manual. I suspect that a simple IF transformer primary for a high impedance tube circuit would work fine as a substitute for the plate coil. Used (CRT Checked) with manual.
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