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FT146 

 1 

2 METER FM  5 WATT 

TRANSMITTER KIT  

Ramsey Electronics Model No.              FT146 

Direct, true FM for excellent voice and data quality.  

Both Data and mike audio inputs 

Solid 5 watt RF output - add our PA-146 for 40 watts 

Crystal controlled with 146.52 MHz crystal included 

Built-in test points for easy tune-up. Align with any     
digital multimeter - tuning tool included, too! 

Runs on 12 - 14 Volts DC at less than 1 amp 

Easy assembly and hook-up 

Informative manual answers questions on theory, hook-
ups and uses - enhances resale value, too! 

Add our case set for a finished 'Pro' look. Cases match 
all Ramsey products  

Clear, concise assembly instruction carefully guides 
you to a finished kit that works the FIRST time! 

Here's a simple hard-working transmitter that's ideal for 
repeaters, Fox-hunts, remote bases, Packet - you name it! Why 
tie up a whole transceiver to just use the transmitter? Fun and 
educational to build - you'll be on-the-air in an evening! 

Summary of Contents for FT146

Page 1: ...ns on 12 14 Volts DC at less than 1 amp Easy assembly and hook up Informative manual answers questions on theory hook ups and uses enhances resale value too Add our case set for a finished Pro look Ca...

Page 2: ...Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters FR146 2 Meter Receiver CPO3 Code Practice Oscillator QRP Power Amplifiers RAMSEY MINI KITS Many other kits are available for hobby...

Page 3: ...and Alignment 19 Power Supply Considerations 21 Verifying RF Power Output 21 Troubleshooting Guide 23 Enclosure Ideas 24 Microphone Considerations 24 Crystal Requirements 25 Parts Layout Diagram 26 R...

Page 4: ...ealed somewhere in the Orient Building your own rig is one of the most satisfying and rewarding experiences you can have and that s what ham radio is all about This little easy to understand two meter...

Page 5: ...round 48 MHz Q4 is another tripler multipling up the 48 MHz to 144 MHz Inductors L5 11 and capacitors C25 17 18 10 for the band pass filter for the three times output frequency From here on out we re...

Page 6: ...K C14 6 100 pf disc capacitor marked 100 or 101 C6 11 16 24 26 29 1 470 pf disc capacitor marked 470 or 471 C30 13 001 uf disc capacitor marked 001 or 1000 or 102 C7 8 23 31 32 33 37 38 39 40 41 44 45...

Page 7: ...498 or 2SC2570A VHF UHF NPN transistor marked C2498 or 2570A Q3 1 NE021 flat pack NPN transistor marked 021 Q4 1 2N3866 metal can NPN transistor Q5 1 SD1127 metal can RF power transistor Q6 1 2N3906 s...

Page 8: ...ical relationship to each other so there s minimal chance of inserting wires into wrong holes Second whenever possible we install in an order that fits our Learn As You Build Kit building philosophy F...

Page 9: ...6 Install C39 001 uf disc capacitor marked 001 1 nf or 102 7 Install C38 001 uf disc capacitor marked 001 1 nf or 102 8 Install C36 01 uf disc capacitor marked 01 or 10 nf or 103 9 Install R14 100K oh...

Page 10: ...re lead is exposed above the board In soldering do not be afraid of using enough heat to make a good solid connection 27 Install R21 2 2K ohm red red red 28 Install C45 001 uf marked 001 1 nf or 102 2...

Page 11: ...constant In this case we wish to hold the voltage to the crystal oscillator steady to keep us on frequency even with a poorly regulated disc capacitor power supply 48 Install R28 100 ohm brown black b...

Page 12: ...021 Carefully remove it from its protective paper and bend all three leads down 90 degrees from its body Notice how one lead is longer than the others that lead the collector must be installed exactly...

Page 13: ...derneath coats nicely with solder Tin all the way up to the ferrite core body Your finished RF chokes should look like this Do not install either part yet 77 Winding L10 and L12 Locate the two small b...

Page 14: ...FT146 14...

Page 15: ...FT146 15...

Page 16: ...iously 86 Install C4 01 uf disc capacitor marked 01 or 10 nf or 103 87 Install L11 pink slug tuned coil 88 Install aluminum shield can cover over L11 89 Install C19 10 pf disc capacitor marked 10 or 1...

Page 17: ...iously Ensure it sits flush 108 Install L1 6 hole ferrite bead RF choke you wound 109 Install C1 01 uf disc capacitor marked 01 or 103 or 10 nf 110 Locate Q6 SD1127 RF power transistor This transistor...

Page 18: ...s completes our assembly of the FT146 two meter FM transmitter Now s a good time to give your masterpiece a good going over being especially alert for any bridged over solder joints misplaced componen...

Page 19: ...ven with the top of their plastic coil form If a slug binds gently rock it back and forth till it loosens up Be very careful not to crack the slug as they are brittle Slowly rotate each slug clockwise...

Page 20: ...sized and matched case for your FT146 Study the following sections regarding the DC power supply and RF power indication and operate your transmitter in accord with good amateur radio practice YOUR P...

Page 21: ...to a socket for the bulb of your choice or even soldered directly to the bulb RF voltage levels in this transmitter can vary from 2 to 25 volts RMS depending on various factors Typically 1 watt power...

Page 22: ...upply immediately because your Q6 RF power transistor is heading to self destruction while probably interfering with every TV set in the neighborhood A poorly matched antenna along with higher supply...

Page 23: ...way detail any and all problems that can rear their ugly head but should get you on the way to solving most errors We d like to be able to forsee a problem a builder may encounter but the sheer numbe...

Page 24: ...omy and rugged portability you will find that the circuit board can be mounted nicely in a standard VHS videotape storage box which also gives room for additional microphone power and antenna connecto...

Page 25: ...a common dual op amp made by many manufacturers and is commonly stocked by most parts stores There are also acceptable standard replacements for some of the semiconductors used in the transmitter SK...

Page 26: ...FT146 26 FT146 PARTS LAYOUT DIAGRAM...

Page 27: ...h be assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I guess the red band really does look orange Ramsey Electronics project kits are packed with pride in the USA If you...

Page 28: ...TTER KIT RAMSEY ELECTRONICS INC 590 Fishers Station Drive Victor New York 14564 Phone 585 924 4560 Fax 585 924 4555 www ramseykits com REQUIRED TOOLS Soldering Iron Ramsey WLC100 Thin Rosin Core Solde...

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