The original Pulsar head did not offer interlocking "Roam" channel pushbuttons and was in that respect more cumbersome to use, at least in the aspect of a roamer trying to step through the various channels to find a marked idle tone. The "FACTS" control head deleted the "Roam" row of pushbuttons altogether and was essentially an IMTS control head designed for limited roaming through urban areas.It required a number of jumpers to be pre-programmed for the "Roam" list. The FACTS control head could also be used with the earlier "MJ" TLD-1100 series radios.
The typical Pulsar I model was T1878A or T1878B. Pulsars suffered from a number of reliability issues; these included poor contact between the sockets and the plug-in circuit cards, and burned-open foil traces on the mother board because they were unable to reliably carry the 10-12 amps of current to the final amplifier section of the transmitter.
Otherwise, the Pulsars were a design rather ahead of its time. Like the TLD-1100 "MJ" radios, the mobile subscriber's ID was programmed into the equipment by means of pin and jack connections on the supervisory printed circuit board. When the successor Pulsar II was introduced, the original Pulsar could be retrofitted with the "MACS" option, which allowed it to search for and seize a vacant channel when a call was attempted during an "all channels busy" situation. "MACS" stands for Motorola Automatic Channel Sentry.
This was an important feature in the days when waiting for a free channel could be a lengthy process, and allowed its user to "jump" onto a vacant channel usually before others, whose recourse was only to endlessly bring the handset off-hook looking for the green light instead of the red busy light. The typical Pulsar I original VHF head is shown below. The unmarked switch on the far right would be the 12th channel in the UHF model. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Telephones\1970-Now". The seller is "sorny86" and is located in this country: US.
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