The last Flight Of Captain Bale

To discover control cable structural features important for sign transmission, we constructed and characterized all doable single amino acid replacements on the Tsr control cable residues. The "UHF" mannequin P-69-17A may be mounted in the automotive trunk, but with a 20 foot lengthy speedometer sort control cable running to the quantity control knob beneath the automotive's sprint ! The antenna input was designed for both a standard broadcast whip or a copper "display" antenna contained in the automotive's headliner ("tarred fabric roof" sedans), aside from the P-69-17 "UHF" receiver, which shared the transmitting "whip" antenna on the car's rear quarter panel and thus required a separate T/R relay field assembly. As originally configured, the power supply was usually installed on the firewall of the automobile, next to the receiver and beneath the glove field, while the RF part was situated in the trunk and attached to its antenna through a brief braided copper rope.

The SP-2 is already wired this way and was mainly intended to facilitate the addition of a transmitter to the cell installation and placement of the receiver in the automobile trunk compartment. The -SP2 modification includes the -SP1 modification, but additionally allows trunk mounting of P-69-18 by adding a cable connector box (see photograph under) which permits the receiver to interchange with a Deluxe Line FMR-13V VHF FM receiver and be appropriate with an FMTR-30D radio accessory set. The instance within the photograph under has a Cinch-Jones connector added close to the audio output transformer which isn't unique. Among the earliest postwar 2-means California Highway Patrol installations began out with a Police Cruiser receiver, and added each Motorola and RCA 39 Megacycle VHF FM transmitters later, in the case of the RCA by modifying the RCA control head to function the P-69-18 Motorola receiver ! 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. In many areas, all local companies other than state police shared the same frequency, which was often the one additionally used by the Highway Patrol, and thus there were small towns with programs on frequencies technically reserved for state police use.

There was widespread conversion to FM and "UHF" at the top of the War, when the FCC made everlasting allocations of 30-forty and 150-174 Megacycle vary frequencies to police and emergency radio techniques and reassigned the 118 Megacycle band to aircraft use. Intended because the companion to the T-69-20A VHF AM transmitter in all "UHF" 2-means methods. All Police Cruisers have been primarily modified variations of Motorola's late 1930's AM broadcast automotive radios (even the "UHF" fashions !) and all are AM receivers. Case style in entrance is barely totally different from others; holes for alignment factors are current a big handle is mounted on the front panel (evidently it was thought this new "UHF" set would need extra frequent service !) Used then-new 1853 (6AB7) VHF tube as RF amplifier. Then he turned once more to his machine. He moved swiftly to his craft, drawing a field of fats-headed sulphur matches from his pocket as he opened a panel in one facet of the machine. Somewhat widespread. The squelch management was moved to the front panel and supplied with a knob, in contrast to previous versions, where it was situated behind a plug button on the aspect of the housing, as proven on the P-69-thirteen above.

There may be one draft arm on every aspect of the mower, just in entrance of the rear tires. Old pictures present the screen, about the scale of a ping-pong paddle, mounted horizontally on insulators above the rear fender. A "rear" mounting choice was also available, no less than with the P-69-18, which consisted of a 17 foot long (!) speedometer fashion cable and an extension cable for the facility and speaker leads. No new Police Cruiser models have been introduced after the War, though no less than the P69-18 was available from present stock by way of about 1951. The FCC issued an order after WWII directing that every one new license purposes for land mobile radio companies have been to be issued one hundred fifty MHz allocations, absent a compelling reason requiring low band or medium wave frequencies. The earlier Police Cruisers generally have a black wrinkle end, while the late-warfare and postwar Police Cruisers have a blue/gray wrinkle finish. The picture beneath exhibits a typical early P-69-18 with a black housing and a crimson nameplate. The picture below reveals an early P-69-17 with the same management head as the other Police Cruisers which were crystal managed. All P-sixty nine Police Cruisers except the P-69-14 are crystal management, single channel.