Gebruiksaanwijzing /service van het product SR2 van de fabrikant Ramsey Electronics
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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.
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 St.
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 .
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.
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 o.
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.
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.
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.
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 .
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 .
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 Subminia.
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.
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.
SR2 – 14.
SR2 – 15.
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.
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] .
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.
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.
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.
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.
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.
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 .
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.
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.
SR2 – 26.
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 .
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 .. .............. .
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