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The -SP2 used pin-tip plugs which attach to the cable connector adapter field. The example in the photo below has a Cinch-Jones connector added near the audio output transformer which is not unique. Or, a Galvin Police Cruiser receiver set up might need had a Stancor or GE transmitter added later. Shown beneath is the primary Deluxe line gear to be provided; typical mannequin numbers would have been the FMR-13(V) 30-40 Megacycle FM receiver on the precise, the FMT-30(D) 25 Watt 30-40 Megacycle FM transmitter on the left, and the P-8022 commonplace management head in front. Masts of the scale just built in new South San Francisco station will quickly be positioned in a direct line from here to New York. The management head is the P-8022 as used on wartime and postwar Deluxe Line FM sets. Shown under are the standard speedometer cable fashion "remote" management head for the P-69- collection Police Cruiser receivers which did not feature electrical volume management, specifically the P-69-12, thirteen and 18, and the "small" mobile speaker. The new volume control was then a DC remotely controlled design somewhat than the speedometer fashion cable of earlier fashions.

A moderately thick cable delivered the high voltage and other traces again to the trunk, under the flooring mat. So great is the length of those electric waves and so low their "dip," that top poles and great length of antenna are absolutely wanted for long distance work. To borrow another Veeder illustration, if a pistol (which represents the spark impulse) is fired close to an open piano, all of the strings are set in vibration; but when a tuning fork be struck, which gives off sound waves of equal size (comparable to those of the Poulsen generator), then solely the strings attuned to that notice give out a response. Case primarily the identical as other Police Cruiser models, but be aware the placement of the "Police Cruiser" nameplate and the lack of capped tuning adjustment holes. P-69-14A by P-69-14B: No data is out there on how these fluctuate from the unique P69-14, or whether or not there really had been P69-14A or B models, however as there was a "C" mannequin, presumably there have been. It is unknown whether there really was an introductory model known as simply "Police," though a grainy picture exists which appears to indicate such a set (see Harry Marnell's LAPD Radio History webpage,) and vibrator replacement manuals of the period refer to a separate mannequin other than "Police Cruiser." It seems that the Model 60P was the first "Police Cruiser" branded receiver.

Note that a plug button masking an access hole exists on the 60P at the upper right corner but doesn't on the "60" automotive broadcast radio. The accessory speaker housing was made from molded, insulated copper cable thick cardboard and meant to bolt to the automotive entrance headliner space above the rear view mirror. Click Here to view the brochure. Motorola has a brochure for this radio on their webpage as a .pdf file. Essentially a "60" mannequin broadcast auto radio with the oscillator and RF part lower right down to obtain 1.5-1.7 or 2.1-2.8 Mc/s police frequencies, regardless of Galvin's claims to the contrary. P-69-12: 6 tube "economic system model". P-69-13: Eight tube "deluxe mannequin". In case you have any kind of questions about wherever and how to utilize Facebook, you possibly can call us on our own web-page. This model appears to have competed with an analogous set manufactured by RCA, which was used by the FBI and federal brokers. A fairly shabby instance seems under. Used extensively by California Highway Patrol, 1938-50. The pushbutton proven on the decrease left of the radio housing is referred to as the "tone control pushbutton." There appears to have been no squelch circuit on the P69-14.

This seems to have been Motorola's only AM mobile transmitter, and is a two piece set in which the facility provide and modulator are in one case and the RF part in a second. Within the case of the Police Cruiser, the "noise antenna" was a coupling to the DC power wiring. This may be similar to the "Lamb" noise silencer standard amongst ham designs within the mid-1930's. These receivers have been the primary and last to offer the "Magic Eliminode" noise limiting feature, which was an utility of a a lot earlier "spark era" approach which utilized a signal from a "noise antenna" out of part with the signal from the actual antenna, the thought being that this would cancel the noise. This magnet, on receiving impulses from the antenna, moves a gold wire so wonderful that it would be almost invisible save for a coating of soot. It's presumed that if there was a tunable model, it could have used the standard broadcast auto radio head but with the brand new frequency range marked on the dial.