Williams Sound PFM 7 Personal FM System The Williams Sound PFM 7 personal FM system was produced by the Williams Sound Corporation of Chicago somewhere in the 1980s. It was a small battery-operated transistorized portable FM system consisting of a transmitter and a receiver. Each unit measured 3 9/16" x 2⅜" x 15/16" (9.1 x 6.1 x 2.4 cm) and weighed 2.4 oz (68 g) without a battery. This FM system had a range of about 150 feet and operated in the 72 - 76 mHz band.
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| Top view of the Williams Sound PFM 7 personal FM system receiver showing the earphone jack (left), the volume control/on-off switch (center) and the microphone jack (right). You could plug the microphone from the FM transmitter unit into the microphone jack of the PFM 7 FM receiver. Then you could use this FM receiver as a personal amplifier (much like the PockeTalker) when it wasn't being used as a FM receiver. |  | Click picture for larger view | | | |
| View of the battery compartment of the Williams Sound PFM 7 personal FM system receiver. This receiver took a standard 9-volt battery. |  | Click picture for larger view | | | |
| Inside view of the battery compartment lid of the Williams Sound PFM 7 personal FM system receiver showing the label pasted there. |  | Click picture for larger view | | | |
| Rear view of the Williams Sound PFM 7 personal FM system transmitter. It looked almost identical to the corresponding receiver (above). |  | Click picture for larger view | | | |
| Top view of the Williams Sound PFM 7 personal FM system transmitter showing the microphone jack (left) and the on-off toggle switch (right). The light below the microphone jack indicated that the unit was on and the battery was good. |  | Click picture for larger view | | | |
| Rear view of the Williams Sound PFM 7 personal FM system showing the microphone plugged into the microphone jack (top right). |  | Click picture for larger view | | | |
| View of the battery compartment of the Williams Sound PFM 7 personal FM system transmitter. The transmitter took a standard 9-volt battery. |  | Click picture for larger view | | | |
| Inside view of the battery compartment lid of the Williams Sound PFM 7 personal FM system transmitter showing the label pasted there.
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