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EDITORIAL BY WA YNE GREEN ARE YOU MISSING SOME GOOD ARTIC LES IN KILOBAUD ? YES! Ou r policy is to make ..re that art~ ¥e not reprinted between 73 and Kilobaud . . . and this ITll!iIIlS that you are mlss'ng a lo t of very important material if you are nol getting both magaz ines. The articles in Kilobaud cover a wide range of topics, centered on the new microprocessor chips ... articles o n w ire-wrapping, how memory 'I\oIOrks, the new printers, handling ICs, surplus keyboards, video termina ls, video generators, and a lot of stuff on the various microcomputers and programs for them ... a whole lot. MO$! of this material will be published just once. so you'll need your back issues of Kilobaud to use as a library fOf reference ... o n business programs, 9
- There are a number of good 2 mete r FM tra nsceivers on the market. You may already ow n one. But, eve n If you do, we suggest that you put your radio to this test . And, if you're thinking o f buying one, this test should be a helpful guide. Is it PLL synthesized? Does it have 100 channels (88 pre-programmed)? Does it have 12 extra diode programmable channels? Doe s it have single knob channel selection? Does it have a LED d ig ital frequency display? nos it have a powered tone pad connection? Does the receiver have helical resonators? If your answer is NO to any of these. t he TR-7500 is the radio that you should ow n, And. in addition to these importa nt features, you g el prov en Ken w ood quality, value and service. NO ooooooo YES o o CJ} TR·7500 I.g!peciflcations Sem iconductors: Transistors 41 FHs 8 ICs 7 Diodes 35 frequency Range: 14601 to 141.99 MHl Mode fM No,01 Channels ' 100 Operatrng Temperature: -20 to , 50 degrees C Power Voltage: ll,S to 160V DC OlaV DC nominal) Grounding Po larity: Negal ive ground Antenna Impedance 50 Ohms Current dra in: less than O_5A In receive wilh no mput signal Less than 3A in transmit (HI) tess than 1.5A in transm it (LOW) (at nav DC) t nmensons: In mrn (6~J/4") w,de 250 mm (9 -7/8") deep 75 mm (2-15/16" ) high Weight: Approximately 2,2 ~g (4.Blbs) TRANSMIT SECTION Rf Output Po wer High: 10 Watts Low' J Watt (appronrnately) Modu lation: Varkable reactance lreQuency shrtt Frequency Deviation · 5 KHz Spur ious Radetca: Beller than - 6OdB Tone Pad Input Impedance: 600 Ohms Microphone. Dynamic mic rophone Oiith PH swrtch, 500 Ohms RECEIVE SECTION Receee System: Double converses superheterodyne Intermediate Frequency lst If: 10.1 MHz 2nd If' 455 kHl SenSitiv ity Better than 04 uV for 20dB qU leling Better than 1uV tor JOdB SIN Squelch Sensit iviti Belter than 0_25 uV SelectiVity: 12kHl at - 6dBdown 40 kHl at-7OdB down Image Rejection: Beller than -7OdB SPUriOUS lntederence: Better than -60dB Aud iO Output: More than 1.5earts across a Ohms load 10% drstomen lntetmadutahon : Better than 66dB TRI O·KENW OOO CO M MUN ICATIONS INC. 111 1 W EST WALNU T/ COMPTON, CA 90220
Page 1 and 2: AUGUST 1977 $2.00 AMATEUR RADIO
Page 3: The DavisCountin S stem A Versatile
Page 8 and 9: • • • • W HO ElSE BUT KENWO
Page 10 and 11: Looking West 8111 Pasternllk WA61 T
Page 12: RTTY Loop Marc I. LeaVl1Y, M.D. WA3
Page 15 and 16: , engineering (& Don't sacrifice ma
Page 17 and 18: price (and thus can be operated con
Page 19 and 20: COMPUTE R IZED MORSE CODE RECE PT I
Page 21 and 22: - will be awarded 10 the top 5 stat
Page 23 and 24: (an effective radi ated power incre
Page 25 and 26: e required. The feed point impedanc
Page 27 and 28: in slightly less power loss. I can
Page 29 and 30: longer model, but I still get good
Page 31 and 32: -= •• e c Q • ". Fig. 3. N
Page 33 and 34: An e xciting new era in amateur rad
Page 35 and 36: Fig. 2. Basic dipole antenna resona
Page 37 and 38: - assumed approached the characteri
Page 39 and 40: Finally, the har d part comes . . .
Page 41 and 42: nCII SPECIAL Purchase! Scan-Aire SC
Page 43 and 44: Steel wire corrodes rapidly in the
Page 45 and 46: about this. Glyn told me that he wa
Page 47 and 48: lie Fig. 2(0). Modified circuit usi
Page 49 and 50: probably an election year), didn't
Page 51 and 52: length. The initial tune-up of Supe
Page 53 and 54: ac tually, a spring is unnecessary
Page 55 and 56:
"j'F==j CE*A..,C FEEllTMROI,IG..S J
Page 57 and 58:
on the 70' a nd 100' towers. Since
Page 59 and 60:
Rick F't rran ti WA6NCXI1 14 Divini
Page 61 and 62:
disap pears. The setting of R1 can
Page 63 and 64:
, • EDDECDM SYSTEM 3DDD ..... ...
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ing-in." By an amazing coincidence,
Page 67 and 68:
give n chip is dependent on the nex
Page 69 and 70:
s ucceed ing second 1.0 second. In
Page 71 and 72:
at 465 kHz, t he standard i-f for t
Page 73 and 74:
particles of beryllia can cause can
Page 75 and 76:
Ericsson-type telephones, which arc
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e two of that exact val ue. You can
Page 79 and 80:
olid state except for the f/convert
Page 81 and 82:
en, ·0 • a name thatsaMs it all
Page 83 and 84:
jurisdiction, but affects a wide ar
Page 85 and 86:
THE PACESETTER IN AMATEUR RADIO TS-
Page 87 and 88:
COLLINS AMATEUR EQUIPMENT KWM·2
Page 89 and 90:
IICOMI VHF/UHF AMATEUR & MARINE EQU
Page 91 and 92:
NYE VIKING No. 114-31~OO3 $8.25 No.
Page 93 and 94:
INC. ARGONAUT TRANSCEIVERS MODEL S4
Page 95 and 96:
". • • • Fig. 2. Detail showi
Page 97 and 98:
the diode (at least 3 A 50 piv) in
Page 99 and 100:
ATTEN T ION: HAM OPERATOR/COMPUTER
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Fig. 2. Scope photograph of an 8080
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nq. 7. The top trace again shows th
Page 105 and 106:
• Booming 25 walls output power @
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The MC14433 The MC14433 is a high p
Page 109 and 110:
OR) 01"1 01'2 1'-- - - ---- - >0 -
Page 111 and 112:
cecds a value which has been presel
Page 113 and 114:
center for the swinging li nk. The
Page 115 and 116:
meters were labeled using a Oymo ta
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TEE/AX PRESENTSj • ......-;;;;:::
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plug, put the motor back in the cas
Page 121 and 122:
amount of testing and si nce four s
Page 123 and 124:
Internol parts placement should aI/
Page 125 and 126:
SST T-l RANDOM WIRE ANTENNA TUNER A
Page 127 and 128:
~~)) • Handle full 200 _tts _ 1o_
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• S,nlhe slzed a General Coverage
Page 131 and 132:
._- -. -0:" • o - o 00 .... ..IIl
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A new precision clock which tells t
Page 135 and 136:
• 6 METER BEAMS 3.5.6.10 ELEMENTS
Page 137 and 138:
SUPERAMP from lJeh/1OrL Match ever3
Page 139 and 140:
P[ ~ . Now It's Crystal Clear Yea,
Page 141 and 142:
C - LINE AMATEUR EQUIPMENT,*>mim.-C
Page 143 and 144:
• ..., • ~. SAVE YOUR / • The
Page 145 and 146:
"," CO ' ~-.. •• '00 •• ,,.
Page 147 and 148:
$29.95 each Wired and tested, compl
Page 149 and 150:
Amplifier in Ktual oper.tion. Radio
Page 151 and 152:
Send For Your Copy Today I Portable
Page 153 and 154:
CRYSTALS FOR VHF RECE IVERS ANY F R
Page 155 and 156:
each reader. Even if they did, that
Page 157 and 158:
Don SIMrp WBIIQF R 2821 Chambers S
Page 159 and 160:
oscillator followed by two triplers
Page 161 and 162:
phone jack for external rf connecti
Page 163 and 164:
, !f CREENEc,mu"n'SUUtto. BALUN 1 "
Page 165 and 166:
The more I stuck with it, the more
Page 167 and 168:
, I~ O "' V I I , tE L >----1~ ,..
Page 169 and 170:
I KNOW ALL ABOUT SSTV, BILL •.. I
Page 171 and 172:
' ~ "Ul ,,~ .. ("or M'_ ~T "'t: ".
Page 173 and 174:
presents. • • KR-400, precision
Page 175 and 176:
•SCR 1.000 lit VJlFFN RIlfJ€tik
Page 177 and 178:
. CUSHCI'I"'f T "''''-4EL. 1.6-148I
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3.1~15921 76 9 + C 456 X S 1 2 3 -
Page 181 and 182:
ADVA VARIABLE POWER SUPPLY • Cont
Page 183 and 184:
NEW LSI TECHNOLOGY FREOUENCY COUNTE
Page 185 and 186:
I WE PAY POSTAGE! ELECTRONICS P. O.
Page 187 and 188:
.,.. " ..",... ' w 7400N TTL" .,..
Page 189 and 190:
ALDELCO COMPUTER CENTER NOW OPENI K
Page 191 and 192:
193
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POL Y PAK'S IS THE " BARREL KIT KIN
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91st and Wolf Road, Wiltow Springs,
Page 197 and 198:
what do you , give the man who has
Page 199 and 200:
,u ThE NEW HOBBY COMPUTERS See doze
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Nam~ S i&nat u T~ ""'''0 II.... _ .
Page 203 and 204:
• REPEATER ATLAS Hundreds of new
Page 205 and 206:
=IER '". .-- - M'CFlOCOMPUTI!t - BR
Page 207:
AN ENERGY CONSERVATION SUGGESTION F
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