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Ramsey Electronics SR2 - page 1
Ramsey Electronics Model No. SR2 • Enjoy hours of fascinating international listening us ing just a simple indoor wire antenna • Select portions of the 4 to 19.5 MHz short wave band, easily re-tuned at any time • Smooth varactor diode tuning • Excellent sensitivity and selectivit y • Front panel Volume and Tuning c ontrols • Multi-stage ...
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Ramsey Electronics SR2 - page 2
SR2 – 2 P ARTIAL LIST OF A V AILABLE KI TS RA MSEY T RA NSM ITT ER KIT S • FM10 A FM Stereo Transmi tter • FM100B Profess ional S ynthesized FM Stereo Br oadcaster • FM25B S yn thesiz ed FM Stereo Transmitter • AM25 Synthesized AM Transmitter • AM 1 AM Tr a n s m i t t e r RAMSE Y RECEI VER KITS • FR1 FM Broa dcast Receiver • AR1 A ...
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Ramsey Electronics SR2 - page 3
SR2 – 3 4-19.5MHz SHORTW A VE RADIO Ramsey Publication No. MSR2 Manual Price Only: $5.00 TABLE O F CONTENT S Introduction to the SR2 ............ ............. .............. . 4 What Y ou Can E xpe ct to H ear ........... ........... ....... 4 Shortw ave List ening as a Hobby ......... ........... ..... 5 Circuit Description ...... ............. ...
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Ramsey Electronics SR2 - page 4
SR2 – 4 INTR ODU CTI ON TO THE SR2 The SR2 is a single-conve rsion superheterodyne receiver designed specifically for listening to AM broadcastin g stations in the range of 4 to 19.5 MHz. Because of this "super het" design, your favorite foreign broadcasting services will come in loud and clear, wi th pleasing audio sound quality, with ...
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Ramsey Electronics SR2 - page 5
SR2 – 5 • BBC London: an intelligent per spective on w orld aff airs • Radio Canada International: editorial quality similar to BBC • Radio Moscow: powe rful signals, increasingly honest and open • Voice of America: VOA broadcasts ar e "aimed" outside the USA, but if you're in the "path" you'll hear it loud a ...
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Ramsey Electronics SR2 - page 6
SR2 – 6 you, you'll be in a better position to choose a more elaborate receiver. While there are various multi-band portable ra dios available, you can expect to pay at least $100 for a receiver offering a signi ficant improvement over y our trusty SR2. To learn m ore about this SW L hobb y , look for a cop y of "Popular Communications& ...
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Ramsey Electronics SR2 - page 7
SR2 – 7 varactor diode tuning. The varactor (D3) forms an L/C (Inductor/Capacitor) tank circuit with T3. Increasing the vo ltage on the varactor diode with R21 (Tuning Pot) increases the capacitance of D3 thus increasing the frequency output of the LO sec tion. Now that we know the two signals coming into the Mixer stage, both the Fc (receive car ...
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Ramsey Electronics SR2 - page 8
SR2 – 8 RSSI circuit is controlled by the value the feedback resistor R17. If you are commonly using a small antenna and listenin g to weak signals, increase the value of R17 to customize the resp onse indication of D2, the signal strength LED. The final stag e, and the real secret to the sensit ivity of the receiver, is the Automatic Gain Contro ...
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Ramsey Electronics SR2 - page 9
SR2 – 9 Anten na J1 RF I nput & F ilterin g Mi x e r In te rm e d ia te Freque ncy Fi l t er Am p In te rm e d ia te Frequency Fi l t er Audi o (S p e a k er ) SR- 2 Bl oc k Di agra m Local O s cilla to r AGC Dem od Si gna l St r e ngt h LED Autom at ic Gain Contr ol R e c e ive S ign a l St re ngt h I ndi ca t or C1, C2,C3 L 1 ,L 2 Q1 T3, D3 ...
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Ramsey Electronics SR2 - page 10
SR2 – 10 PA RTS LI ST CA PA CITO RS 1 10 pF ceramic disc capacitor [marked 10] (C30) 1 47 pF ceramic disc capacitor [marked 47] (C15*) 4 100 pF disc capacitor [marked 100, 101, or 100K] (C5,15*,16 *,17) 1 330pF disc capacitor [marked 330 or 331] (C2) 6 .001µF disc capacitors [marked .001, 102, or 1nF] (C1,3,16*,20,21 ,25) ...
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Ramsey Electronics SR2 - page 11
SR2 – 11 HARDWARE AND MISCELLANEOUS 1 SR2 printed circuit board 2 10K potentiometers (R14,21) 1 DPDT PC-m ount push bu tton s w itch (S1) 1 RCA-type PC-mount jack (J1) 1 Subminiature phone jack (J2) 1 9-volt b attery snap con nector 1 9-volt battery hold-down clamp REQUIRED, NOT SUPPLIED: 9-volt alkaline or heavy-d ...
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Ramsey Electronics SR2 - page 12
SR2 – 12 ASSEMBLY INSTRUCTIONS In ALL PC-bo ard assembl y steps, our word "INSTALL" m eans to do this: Insert the part, oriented o r "pointed" correctl y , into its holes in the PC board. If helpf ul, gently BEND th e part's w ire lea ds or tabs t o hold it in plac e, with th e body of the part snugl y against the ...
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Ramsey Electronics SR2 - page 13
SR2 – 13 We will now begin constructing the local oscillator section. 5. Install C22, one of the 10µF electrolytic ca pacitors. Electrolytic capacitors have a right and wrong w ay to be installed. Usually, capacitors have a wide stripe which indicate s their negative lead and the PC board or Parts Layout Diagram w ill show the positive side ...
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Ramsey Electronics SR2 - page 14
SR2 – 14 ...
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Ramsey Electronics SR2 - page 15
SR2 – 15 ...
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Ramsey Electronics SR2 - page 16
SR2 – 16 jumped ahead and installed T3, w e've got bad news for you). Before this shielded transformer can be installed, its internal capacitor need s to be removed. Looking at the underside of this transformer, you'll see a tubular part, probably white wi th a brown band, somewhat like the resistors in this kit. This is brittle and eas ...
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Ramsey Electronics SR2 - page 17
SR2 – 17 33. Install R2, 22K oh m s [red-r ed-orange]. 34. Install R 1, 100K ohm s [brown-black -yellow]. 35. Install C24, 1µF electrolytic capa citor. Remember to watch polarity when installing. 36. Install C 5, 100 pF disc capacitor [m arked 100, 101, or 100K] . 37. Install C 4, .01µF disc c apacitor [m arked .01, 10 3, or ...
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Ramsey Electronics SR2 - page 18
SR2 – 18 58. Install C9, 1µF electrolytic capa citor. Check polarity when installing. 59. Install C11, 10 µF electrolytic. Observe correct polarity before installing. 60. Install R16, 270 ohm [red-violet-brown]. PROGRESS SUMMARY Now is a good time to take a break. Examine your work so far checking things such a s component values, p ...
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Ramsey Electronics SR2 - page 19
SR2 – 19 72. Install the battery clamp. Position battery and holder so as not to cover nearby PC board mounting holes. Use the method for securing the clamp that is most convenie nt for you, such as : • wire lo oped through clamp and PC board holes, soldered. • small screws • double-faced adhesive strips • hot-melt glu e 73. If yo ...
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Ramsey Electronics SR2 - page 20
SR2 – 20 provide a ground connection. 4. If an indoor antenna is necessary, simply make it as long as possible and as high up from conc rete floors as you can. 5. W hen installing any outdoor antenn a, BE VER Y CAREFUL not to let your antenna wire come in co ntact with electric power lines. 6. Any antenna wire f or short wave listening ma y run h ...
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Ramsey Electronics SR2 - page 21
SR2 – 21 4. Turn ON the receiver. After adjus ting the volume to a pleasant level, you should hear som e shortwave station s by turning the Tune Control, no matter how any of the adjustable coils h appen to be se t. While listening to any kind of station, w hether broadcast or Teletype, etc., use a small screw driver to adjust the slugs in tr ...
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Ramsey Electronics SR2 - page 22
SR2 – 22 reception. Eventually, you will get a clue as to what general fr equency band you are hearing, because many stations periodically annou nce their frequencies, particularly at sign-on and sign-off times. If you like precision, use a frequenc y counter or calibrat ed receiver to find the SR2's strong oscillator signal, rem e mbering t ...
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Ramsey Electronics SR2 - page 23
SR2 – 23 THE RAMSEY ELECTRONICS C A SE, KNOB & HARDWARE OPTION Your finish ed receiver can be installed in a variety of enclosures of your own design and cho osing. You might be p lanning to combine several Ra msey circuit kit boards in a single enclosure . Use of the inexpensive and attractive Ramsey case and knob kit will give your unit tha ...
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Ramsey Electronics SR2 - page 24
SR2 – 24 SAMPLE SHORTWAVE LOGGINGS Freq Country Notes/Contributor (MHz) 4.30 PERU ballads, huaynos, brief annmt, TC partial ID, tnx 4.31 DIEGO GA oldies, good sig 4.38 PERU long talk , rel talk, choir, poor 4.40 BOLIVIA romantic vocals, poor 4.72 S VIETNAM VT pop tunes, YL anncr, instl mx 4.72 MYANMAR soft vocals, ID , nx 4.78 GUATEMALA ID, nx 4. ...
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Ramsey Electronics SR2 - page 25
SR2 – 25 SAMPLE SHORTWAVE LOGGINGS Con’t Freq Country Notes/Contributor (MHz) 18.96 SW EDEN "S w eden Today", special on Nobel priz es 18.96 SWEDEN "Sweden To day", article on burden of military spending on developing c ountries 18.96 SWEDEN Cinema Africa Film Fest being held in Stock holm 18.98 USA relig m x, sermon, ID ...
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Ramsey Electronics SR2 - page 26
SR2 – 26 ...
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Ramsey Electronics SR2 - page 27
SR2 – 27 The Ramsey Kit Warranty Ple ase r ead car efu lly BEFO RE call in g or writi ng in a bout your k it. M ost pro blem s can be sol ve d without contacti ng the f actory. Notice that thi s is not a " fine print" warranty. We want you t o unders tand your righ ts and ours too ! All Ramsey kits will w ork if assemble d properly . Th ...
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Ramsey Electronics SR2 - page 28
SR2 – 28 SR2 S hortw ave Rece iver Qui ck Ref erenc e Pag e Guid e Introd ucti on to the SR2 .. ........... ......... . 4 What You C an Expect to Hear ............ 4 Shortw ave Listeni ng as a Hobby ......... 5 Circuit Description .. .............. ............. .. 6 Parts L ay out Diagra m ........... ......... ..... 8 Parts List .............. ...
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