Ten Insulated Copper Cable Mistakes That May Cost You $1m Over The Next Six Years > 자유게시판

• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

The -SP2 used pin-tip plugs which attach to the cable connector adapter box. The example in the photograph beneath has a Cinch-Jones connector added near the audio output transformer which isn't unique. Or, a Galvin Police Cruiser receiver installation might need had a Stancor or GE transmitter added later. Shown beneath is the primary Deluxe line equipment to be supplied; typical mannequin numbers would have been the FMR-13(V) 30-40 Megacycle FM receiver on the correct, the FMT-30(D) 25 Watt 30-40 Megacycle FM transmitter on the left, and the P-8022 commonplace management head in entrance. Masts of the scale just built in new South San Francisco station will quickly be placed 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 below are the usual speedometer cable model "distant" management head for the P-69- sequence Police Cruiser receivers which didn't function electrical quantity control, specifically the P-69-12, thirteen and 18, and the "small" cellular speaker. The new volume control was then a DC remotely controlled design reasonably than the speedometer fashion cable of earlier fashions.

A rather thick cable delivered the high voltage and other strains back to the trunk, below the ground mat. So nice is the size of those electric waves and so low their "dip," that top poles and great size of antenna are completely needed for lengthy distance work. To borrow another Veeder illustration, if a pistol (which represents the spark impulse) is fired near an open piano, all of the strings are set in vibration; but if a tuning fork be struck, which supplies off sound waves of equal length (comparable to these of the Poulsen generator), then only the strings attuned to that observe give out a response. Case essentially the identical as other Police Cruiser fashions, however word the location of the "Police Cruiser" nameplate and the lack of capped tuning adjustment holes. P-69-14A by means of P-69-14B: No information is out there on how these vary from the original P69-14, or whether there really had been P69-14A or B fashions, but as there was a "C" model, presumably there were. It's unknown whether there really was an introductory mannequin known as simply "Police," though a grainy picture exists which seems to point out such a set (see Harry Marnell's LAPD Radio History web site,) and vibrator replacement manuals of the period discuss with a separate model aside from "Police Cruiser." It appears that the Model 60P was the primary "Police Cruiser" branded receiver.

Note that a plug button masking an access hole exists on the 60P at the higher proper nook however does not on the "60" automobile broadcast radio. The accessory speaker housing was product of molded, insulated copper cable thick cardboard and supposed to bolt to the automobile front headliner space above the rear view mirror. Click Here to view the brochure. Motorola has a brochure for this radio on their web site as a .pdf file. Essentially a "60" mannequin broadcast auto radio with the oscillator and RF part minimize all the way down to receive 1.5-1.7 or 2.1-2.Eight 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". For those who have just about any questions regarding in which in addition to the best way to utilize Facebook, you can email us with our own web site. This mannequin seems to have competed with an analogous set manufactured by RCA, which was utilized by the FBI and federal brokers. A somewhat shabby example appears under. Used extensively by California Highway Patrol, 1938-50. The pushbutton proven on the lower left of the radio housing is referred to because the "tone control pushbutton." There appears to have been no squelch circuit on the P69-14.

This appears to have been Motorola's solely AM mobile transmitter, and is a two piece set in which the ability 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 much like the "Lamb" noise silencer fashionable among ham designs in the mid-1930's. These receivers had been the first and last to offer the "Magic Eliminode" noise limiting function, which was an application of a a lot earlier "spark period" method which applied a signal from a "noise antenna" out of section with the sign from the precise antenna, the concept being that this could cancel the noise. This magnet, on receiving impulses from the antenna, moves a gold wire so nice that it would be almost invisible save for a coating of soot. It is presumed that if there was a tunable mannequin, it could have used the standard broadcast auto radio head however with the new frequency range marked on the dial.