The -SP2 used pin-tip plugs which attach to the cable connector adapter field. The instance within the photo under has a Cinch-Jones connector added near the audio output transformer which is not original. Or, a Galvin Police Cruiser receiver installation may need had a Stancor or GE transmitter added later. Shown below is the primary Deluxe line tools to be supplied; typical model numbers would have been the FMR-13(V) 30-forty Megacycle FM receiver on the best, the FMT-30(D) 25 Watt 30-40 Megacycle FM transmitter on the left, and the P-8022 normal control head in front. Masts of the dimensions just built in new South San Francisco station will quickly be positioned in a direct line from right here to New York. The management head is the P-8022 as used on wartime and postwar Deluxe Line FM units. Shown below are the usual speedometer cable fashion "distant" control head for the P-69- collection Police Cruiser receivers which did not function electrical volume management, particularly the P-69-12, thirteen and 18, and the "small" mobile speaker. The brand new quantity management was then a DC remotely managed design slightly than the speedometer style cable of earlier fashions.

A somewhat thick cable delivered the excessive voltage and other strains again to the trunk, below the flooring mat. So great is the size of these electric waves and so low their "dip," that high poles and great length of antenna are absolutely needed for lengthy distance work. To borrow one other Veeder illustration, if a pistol (which represents the spark impulse) is fired near an open piano, the entire strings are set in vibration; but when a tuning fork be struck, which gives off sound waves of equal length (comparable to these of the Poulsen generator), then only the strings attuned to that note give out a response. Case essentially the same as different Police Cruiser models, however be aware the situation of the "Police Cruiser" nameplate and the lack of capped tuning adjustment holes. P-69-14A through P-69-14B: No information is obtainable on how these fluctuate from the original P69-14, or whether there really had been P69-14A or B models, however as there was a "C" mannequin, presumably there have been. It's unknown whether or not there actually was an introductory mannequin called simply "Police," though a grainy photo exists which appears to indicate such a set (see Harry Marnell's LAPD Radio History web site,) and vibrator replacement manuals of the era seek advice from a separate model other than "Police Cruiser." It appears that the Model 60P was the first "Police Cruiser" branded receiver.

Note that a plug button overlaying an access hole exists on the 60P at the higher right nook however does not on the "60" automotive broadcast radio. The accessory speaker housing was made from molded, insulated copper cable thick cardboard and supposed to bolt to the automobile front headliner area 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" model broadcast auto radio with the oscillator and RF part lower all the way down to obtain 1.5-1.7 or 2.1-2.8 Mc/s police frequencies, regardless of Galvin's claims to the opposite. P-69-12: 6 tube "economic system mannequin". P-69-13: Eight tube "deluxe model". Should you have any inquiries with regards to in which and the way to employ Facebook, you possibly can call us on our own internet site. This model seems to have competed with a similar set manufactured by RCA, which was used by the FBI and federal agents. A slightly shabby instance seems below. Used extensively by California Highway Patrol, 1938-50. The pushbutton shown on the decrease left of the radio housing is referred to because the "tone management pushbutton." There seems to have been no squelch circuit on the P69-14.

This appears to have been Motorola's only AM cellular transmitter, and is a two piece set through which the facility supply and modulator are in one case and the RF section 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 well-liked among ham designs in the mid-1930's. These receivers were the primary and last to offer the "Magic Eliminode" noise limiting feature, which was an utility of a much earlier "spark period" technique which applied a sign from a "noise antenna" out of part with the signal from the actual antenna, the thought being that this might cancel the noise. This magnet, on receiving impulses from the antenna, moves a gold wire so wonderful that it can be almost invisible save for a coating of soot. It's presumed that if there was a tunable mannequin, it will have used the standard broadcast auto radio head however with the new frequency range marked on the dial.