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Ramsey Electronics AF1 - page 1
AF1 • 1 E - Z CW AUDIO FIL TER Ramsey Electronics Model No. A F1 Here’s a quick and easy way to eliminate interfering C W signals! This filter uses a digital bandpass fi lter to knock out those unwanted signals. The adj ustable c enter frequency and switchable bandwidth add some vers atility to this hard working kit! • Utilizes “state of th ...
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Ramsey Electronics AF1 - page 2
AF1 • 2 RA MSEY TRA NSMIT TER KITS • FM100B Professional FM Stereo Transmitter • FM25B S yn t hesized Stereo FM Transmitter • MR6 Model Rocket Track ing Transmitter • TV6 Television Tra nsmitter RAMSE Y RECEI VER KI TS • FR1 FM Broa dcast Receiver • AR1 A ir craft Band Recei ver • SR2 Shortwa v e Recei ver • SC1 Shortwav e Convert ...
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Ramsey Electronics AF1 - page 3
AF1 • 3 AF1 CW AUDIO FIL TER Ramsey Publication No . MAF1 Price $5.00 TABLE OF CONTENTS Introduction to the AF1 .................. 4 How it works ........ ................. ......... 5 Parts list ................. ................. ...... 6 AF1 Assembly instructions ............ 8 Schematic diagram ..................... 10 Parts Layout diagram .. ...
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Ramsey Electronics AF1 - page 4
AF1 • 4 INTR ODU C TION Radio men know that the C W signal is the most reliable m ode of transm ission when opera ting on the ama teur radio bands. Ther e are, however, so m e inherent problems that exist in CW reception. When listening to a carrier wave, or C W signal, our rece iver is sim ply letting us hear the difference between the lo cal os ...
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Ramsey Electronics AF1 - page 5
AF1 • 5 THEORY OF OPERATION Let’s have a look a t what m akes our audio filter so special. Have a look at the schematic diagram and follow along. First, havi ng a look at the po wer supply section of t he AF1 notice that diodes D3, 6, 7,and 8 form a full wave bridge re ctif ier. We used this configuration so that an AC or DC power source may be ...
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Ramsey Electronics AF1 - page 6
AF1 • 6 AF 1 PART S LI ST Please check the boxes after the components have been identified, and now is a good time to “sort” the like components into groups or bins (an egg carton do es nicel y) to avoid using the wrong compone nt during a ssembl y. RESISTORS AND POTENTIOMETERS Please note that the kit contains some “special” 1 % toleranc ...
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Ramsey Electronics AF1 - page 7
AF1 • 7 MISCELLANEOUS PARTS 1 2.5mm power jack (J4) 2 PC mount RCA jacks (J1, 3) 3 DPDT pushbutton switch (S1, 2, 3) 1 1/4” stereo headphone jack (J2) 1 AF1 printed circuit board RAMSEY Learn-As-You-Build KIT ASSEMBLY There ar e numer ous solder connections on the AF 1 printed ci rcuit board . Therefore, PLEASE t ake us seri ...
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Ramsey Electronics AF1 - page 8
AF1 • 8 Now, let's get building ! Since you may appreciate some “wa rm -up” soldering practice as well as a chance to put some “landm arks” on th e PC board, w e’ll f irst install some “hardware” components . This will also help us to get acquainted with the up - down, left - right orientation of the circuit board. Remember tha ...
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Ramsey Electronics AF1 - page 9
AF1 • 9 polarit y. See the par ts diag ram fo r proper pl acement. The capa citor should fit snugly down to the PC board. When installing the components be sure to save some of the longer clipped leads to use later as “jumper” wires. 12. Install C11, another 1000 uF electrol ytic capacitor. Be sure to observe the proper polarity. 13. ...
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Ramsey Electronics AF1 - page 10
AF1 • 10 23. Install R22 and R21, both 100 ohm [brown -bla ck-brown]. They are also mounted standing up. 24. Install stand up resistor R20, 1K ohm [brow n-b lack-red]. 25. Form and install diode D1, a 1N4148 type small signal diode [small glass case with black band]. Be sure to orient the part as shown in the parts pl acemen t diagram ...
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Ramsey Electronics AF1 - page 11
AF1 • 11 AF 1 PART S LAY OUT DIA GRAM ...
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Ramsey Electronics AF1 - page 12
AF1 • 12 31. Using a scrap component lead, form and install JMP11. 32. Install C13, .1 uF disc [marked .1 or 1 04]. 33. Install C2, .001 uF disc capacitor [marked 102 or .001]. 34. Install R1, 47K ohm [yellow-violet-o range]. I’ll bet y ou didn’t forget to stand it up. 35. Install C10, .01 uF disc capacitor [marked .01 or ...
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Ramsey Electronics AF1 - page 13
AF1 • 13 51. Install R3, 47K ohm [yellow-violet-o range]. 52. Install R2, 750K ohm [violet-green-yellow]. 53. Install R5, 100K ohm [brown-black-yellow]. 54. Install R7, 49.9K ohm [yellow-white-white-red]. 55. Install C14, .01 uF disc capacitor [marked .01 or 103 or 10nF]. 56. Now we’ll install the two MF8 swit ched capac ...
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Ramsey Electronics AF1 - page 14
AF1 • 14 Connect an audio ou tput device such as a speaker or headset to the appropriate jack (J1 or J2, respecti vely). With switch S1 in the off position you shoul d be able to he ar the tone under test. Set switches S2 and S3 in the “out” position for maximum bandw idth. Push in switch S1 to ener gize the circuit. Adjust R14 f ...
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Ramsey Electronics AF1 - page 15
AF1 • 15 The Ramsey Kit Warra nty Please read carefully BEFORE calling or writing in about y our kit. Mos t problems can be solved wi t hout contacting the factory . Notice that thi s is not a "fine prin t" warranty. W e w a nt you to und erstand your righ ts and ours too ! All Ramsey kits w ill work if assembl ed properly. The ve r y f ...
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Ramsey Electronics AF1 - page 16
AF1 • 16 AF1 CW AUDIO FILTER Quick Re ference P age Guide Introduction to the AF1 ............... ... 4 How it works ........................ .......... 5 Parts list .............. ................. .......... 6 AF1 Assembly instructions ..... ....... 8 Schematic diagram ................. ..... 10 Parts Layout diagram ................. .. 11 Hook ...
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