Uniden UBC 175xL User Manual

YOUR ONE -STOP SOURCE OF ELECTRONICS INFORMATION ICD 08559 MARC`-I 1988 $2.50 CANADA $3.50 THE MAGAZINE FOR ELECTRONICS & COMPUTER ENTHUSIASTS 11

Only NRI gives you a 27" highs- resolution stereo color TV you build to prepare you for today's video servicing careers. Become one of Ameri

The Video Revolution Is Just Starting Already, disc players can handle audio CDs and laser video discs. And now there are machines that will accom- mo

1111111/ NEW PRODUCTS /11111111 For more information on products described, please circle the appropri- ate number on the Free Information Card boun

tapes. Characters can be displayed in four sizes and can be made to scroll off -screen, just as they do in profes- sional moving pictures. In addition

NEW PRODUCTS which requires no additional hard- ware for interconnecting 32 PCs. Multiple adapters can be installed in each PC to be used as Ga

For convenience and longest bat- tery life, power to the module auto- matically switches off when the headset is not plugged in. The Air - dapter

MODERN March 1988 An EPROM Speed Reader/Comparator Checks 16K to 512K EPROMs for complete erasure and compares a copy with an original EPROM in just s

Q CO U W LL. (} 2 J z cc u) n n n n n n n n n n n n n n n n. o o o o 1/vI cv 2 - â H > + TT Say You Saw It In Modern Electronics March 198

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N POCKET SIZE SIZE:4 "Hx3.5 "Wx1 "D MADE IN USA OPTDelectronics inc FREQUENCY COUNTERS TO 1.3 G HZ 8 LED DIGITS 2 GATE TIMES ANODIZED

C6 100µF " C9 _ 0.1µF ¡ C10 0.1µF - 013 _ ' 0.10F - o 6Vdc (D) C12 0.1GiF IC18 7810 OUT COM 05 ' 100µF C7 ' 0.1µF C8 0.1µF C11 0

circuit board. Because of the great number of interconnecting runs re- quired to assemble the circuit, a printed- circuit board is recommend- ed.

the board. This done, remove the IC and set it aside. Flex the metal con- necting strip on both rows of Solder - cons until it parts from the recepta

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{ nent side of the board. Flip over the board and solder the leads to the pads on the bottom of the board. Clip away any excess lead length

for easy reference. Disconnect the supply from the ac outlet. Then con- nect and solder the + 5 -volt conduc- tor directly to the + pad and the un-

Communications Mixing Frequencies: A New Look Photos help explain complex linear mixing to amateur radio operators and others By John Wannamaker One

In Fig. 3, a ramp can be seen tak- ing shape. This ramp is composed of a fundamental frequency and its sec- ond, third and fourth harmonics. All har

I ig. 6. With carrier reduced to zero, sideband reacts frith sideband and introduces a frequency that is twice that of the true audio component. pari

modulation envelope shown in Fig. 5 has been added for purposes of clari- ty. Although linearly mixed, each component frequency would be het- erodyne

CABLE EQUIPMENT PRICES SLASHED WHILE YOU WHIP. Call Aunt Matilda at pacific Cable Co.. Inc.. and get a pleasant surprise: Instant price cuts even on

Circuitry Experimenting With Audio Circuits Using op -amps to build a variety of professional audio circuits to suit different requirements By Joseph

tances is C = 106/(6.28FR), where C is in microfarads, F is the required 3 -dB frequency and R is the value of the associated resistance (R2 or R3

R1, 500K ' COMP value that is too low to prevent load- ing the signal source. If the signal source is another op- erational- amplifier preamp (

Fig. S. A 600 -ohm line receiver am- plifier circuit. turns ratio of the transformer. Sup- pose, for example, a 600 -ohm input, 10k -ohm output tr

R1 Cl 51 1µF Audio input (A) 10 3,4,6,7,8,9 1M Cl 1 µF C2 100µF 14 12 Audio input (B) 51 C3 1pF (---° Audio output 1 R2 10M AA C2 1µF C3 1 k F DETAI

is capable of up to 30 dB of gain at a V + of 15 volts dc, slightly more at lower potentials but only at a sacri- fice of the 1 -MHz -3 -dB poin

Project Automatic Telephone Flasher Add -on accessory gives you visual indication of an incoming telephone call By Anthony J. Caristi Have you ever mi

B1 . 3v R5 47K R1 2.2K rtv- Telephone line 0.33µF R10 470 C8 T 0.01 µF 05 T1 7 D3 = 1 N4004 04 D4 1 N4004 C5 22µF C6+ 22µF I FT1 K 'NAh R9 T2 s

Since its gate -to- source voltage is zero, Q3 remains in cutoff during standby. The resistance between the drain and source is virtually infinit

0.001 second, the flash produces enough light -similar to that of a photoflash used with cameras -to be easily seen. As FT1 flashes, C5,

IIIIII/MODERN EL ICS THE MAGAZINE FOR ELECTRONICS & COMPUTER ENTHUSIASTS MARCH 1988 18 40 (_, 46 53 VOLUME 5, NUMBER 3 FEATURES 18 An EPROM Speed

identify the unmarked ends of the primary. Label the wire that gives continuity with the end labeled 4 with a 5. The other wire then gets a la

and 3. With the cells connected into the circuit as shown, there should be no project activity. For your final test, plug the modu- lar connector a

Project A Solid -State Electric -Blanket Controller* Eliminates problems usually encountered with electromechanical controllers and provides greater e

SOLID STATE CONTROLLER: Each ON -OFF cycle = 1/60 sec. ELECTRO -MECHANICAL CONTROLLERS: OFF ON-OFF cyc ing takes minutes. Fig. I. Solid -state contro

PL 117 V ac S1 "POWER" Cl TRIAC MT, .01 µF DIAC D-30 gate 3 H C2.1µF 1C3 .1 tiF Q1 R2 100 KO R1 10 KS2 C4 l'51 µF R3 200 KS2 106 &quo

strip solder lugs are needed. Any ter- minal strip used should be mounted on the aluminum faceplate of the box with machine hardware. As shown in

How Phase Control Works When controlling a large electrical de- vice, it is more efficient to have it turned all they way on or all the way off, rath

In the following procedure, hook- up -wire lengths are given for a small enclosure box. If you use a larger box, adjust the lengths as need

plastic project box that has an alumi- num faceplate. Checkout & Use With the project completely wired and double checked for poor solder- ing a

Technology Surface -Mount -Device Repair How to remove flat packaged SMDs using soldering tools By Victor Meeldijk In a manufacturing facility, re- pl

Radio Ihaek Parti Plaee TMMEIIM% PARTS FOR PROJECTS ARE NEIGHBORHOOD CLOSE Save With Hotline Order Service Over 200,000 Substitutions Available Your

Project An In- Circuit Transistor Tester A low -cost bench /portable instrument for testing bipolar transistors in- and out -of- circuit By Jules H. G

sut SPST -P = T 93 3 14 4093 ! ' raD. 4 RD ICI RI IOOK CI f1i(1.4R1C1) 7 9z T'ur ICI 7 ICI 4093 IC 330 1 Emitter N D3 LED DI D2 Hese Co

other 0.6 -volt drop across the bad transistor to produce a drop of 1.8 volts. This is enough to turn on the LED. Therefore, internal short cir-

NPN PNP IN- CIRCUIT TRANSISTOR TESTER PRESS TO TEST Emitter Collector Base Fig. 4. Actual -size front panel art- work. Use this or a same -size pho

III The magazine for Computerist & Amateur Radio Your 01 source of Packet info. received my moneys worth with lust one issue. ."

Test Equipment Catalog. A new catalog that lists and describes new and custom - reconditioned electronic test instruments available at savings of up

!Iih/ELECTRONICS NOTEBOOK Illd Experimenting With a Superconductor By Forrest M. Mims III The Nobel prize for physics is generally awarded years afte

the Materials Research Society in Bos- ton, those in attendance quickly realized that Muller and Bednorz had indeed made a momentous discovery

ELECTRONICS MOT ... heating cycles can greatly affect the su- perconducting properties of the fin- ished pellet. Pellets by themselves have few ap

gen will immediately and violently boil when it strikes the comparatively warm objects in the container. After 10 or 20 seconds, the boiling w

llllhI/EDITORIAL Illll11 The digital audio tape (DAT) machine saga continues into 1988 as hardware makers jockey among themselves and their record -in

ELECTRONICS NOTEBOOK... Fig. 8. The tilted floating magnet has again been nudged to spin. netic field will indeed penetrate a super- conductor. You

painted nickel electrodes costs $85. Two disks without electrodes cost $100. Quantity discounts are available. How to Obtain Liquid Nitrogen It wa

VIII SOLID -STATE DEVICES ÏII11111111=M A new switching regulator, an improved BCD -to -7- segment decoder, another buzz word and what's new By H

100µF= - 1N4001 SitF 200µH 470 1W LT1070 GND 5K 0.1µF 1 00 (t F 10.7K 1N914 47 -nn E1.2K 2µF > 470 Input +10 to +30V Output -12V 2A Fig. 3. A Po

SOL ID -STATE DEVI CES .. fessional or business letterhead by writ- ing to the company at 1630 McCarthy Blvd., Milpitas, CA 95035 -7487. An Improve

and you can too! Andy is a Harn Radio operator and he's having the time of his life talking to new and old friends in this country and around

VIII CQMYHMNCAT/ONS IIIIM A Sampling of Winter 1988 English- Language International Shortwave Broadcasts By Gerry L. Dexter Time Station /Country 0000

Time Station /Country 0400 Radio Cameroons (30) Radio Bucharest, Romania RAE, Argentina Radio Havana Cuba UAE Radio, UAE TWR Netherlands Antilles R

COMMUNICATIONS Time Station /Country Frequencies Time Radio Norway Int'l. (Sun) 9590, 15310, 17775 BRT Belgium 15590 Radio Finland Int'

Time Station /Country 2000 Radio Baghdad Radio Sofia, Bulgaria (30) Radio Budapest, Hungary Radio Netherlands (30) Swiss Radio Int'l. Radio D

quence of recording DAT machines. However, I shudder at the CBS solu- tion: a device that prevents all recording. Everyone loses! The Philips anti

MIIfELECTRONICS OMN/BUS!111 Computer spreadsheets for technical calculations and Car compact disc player considerations By Curt Phillips No doubt you

El: (,0) 9IF(B4 *85>0,(10 -6)/(2 *3.14159 *((B4 *85) "0.5)),0) A B C D 1 Frequency >> 12,031 2 3 READY E F 4 L in uH 35 5 C in

MP PC CAPERS III Clone compatibility; making car signs; computer "mice" By Ted Needleman A question that I'm frequently asked is whethe

JPIN CRVSTRLS become a standard a lot sooner. There- fore, when upgrading, you might try and buy a graphics display board that is either compatibl

PC CAPERS .. Felix for Mac Plus. amount of clear desk space for "moving and shlepping." Substituting a joy -stick or trackball for these non

GoMASTER THE NEW ELECTRONICS WITH MCGRAW- HILL'S Be an/116 S erleS The fast, easy and low cost way to meet the challenges of today's electro

1 FOCUS /1/1111 GOfer -A High -Speed Text Searcher By Art Salsberg Microlytics, Inc. (E. Rochester, NY) es- tablished itself as a winning softwar

he wants, selecting it by pressing the space bar, which highlights it. Pressing Return confirms this and brings up an Output window. Here you hav

br $ PICKS UP A WHISPER 50 FEET AWAY! The model WAT -50 miniature FM tranmitter uses a 4 -stage circuit NOT to be confused with a simple wire- le

I ' 7 -800- 344 -453 9 // C O R P O R A T N AK, Puerto Rico - 218.681-6674 Telex 62827914 FAX 218 -681 -3380 TWX - 9103508982 DICI KEY

INN eReeERyELECTRONICS NEWS/I/fill RADAR DETECTOR ADVANCES. Uniden's new "Uniden Talker" radar detector lets the user program a warnin

CABLE T.V. CONVERTERS WHY PAY A HIGH MONTHLY FEE? All Jerrold, Oak, Hamlin, Zenith, Scien- tific Atlanta, Magnavox and all special- ized cable eq

TRANSISTORS- TUBES: MRF421 $24.00, MRF454 $14.50, MRF455- MRF477 $11.75, MRF492 $16.00, SRF2072 $12.75, SRF3800 $17.50, 2SC2290 $16.75, 2SC2879

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Ya,esu has serious listeners for the serious listener. Yaesu's serious about giving you better ways to tune in the world around you. And whether

NEW! CB Radios & Scanners Communications Electronics; - the world's largest distributor of radio - scanners, introduces new models of CB &