Ramsey Electronics FM10A Manuel d'instructions

VLF1 • 1 LOW BANDER Low Frequency SWL Converter Ramsey Electronics Model No. VLF1 • Converts 400KHz shortwave up to 4MHz. • Less tha

VLF1 • 10 ASSEMBLY INSTRUCTIONS Once you’ve begun to install some of the longer leaded parts, save a couple of clipped off leads to use as jumpers i

VLF1 • 11  12. Take the 36 AWG wire and cut it into 3, 20” pieces. Now, take 2 of these pieces and twist the ends together about a half an

VLF1 • 12  16. The twisted part is the center tap of the secondary and the other two ends make up the end points of the secondary. You

VLF1 • 13  19. Lastly, solder in your transformer, aligning the primary and secondary leads as they appear in the board outline. You ha

VLF1 • 14  31. Install Q1 the 2N3904 NPN transistor next to C13. This provides amplification for the mixed signal fed to the output jack. Be sure

VLF1 • 15  47. Install the 7805 voltage regulator, bending the pins back and letting it lay flat on the board as shown in the picture.  48

VLF1 • 16 SETUP AND TESTING With all this done, it is now time to set up your VLF1 and apply power!  The first thing to do is plug in the power

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VLF1 • 19 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting

VLF1 • 2 PARTIAL LIST OF AVAILABLE KITS: RAMSEY TRANSMITTER KITS • FM10A, FM25B FM Stereo Transmitters • AM1, AM25 Transmitter R

VLF1 • 20 VLF1 LOW FREQUENCY SWL CONVERTER Quick Reference Page Guide Introduction to the VLF1 ... 4 VLF1 Circuit Description

VLF1 • 3 Low Bander, Low Frequency SWL Converter Kit Ramsey Publication No. VLF1 Manual Price Only $5.00 TABLE OF

VLF1 • 4 INTRODUCTION You have a great setup, tuning in just about everything in the spectrum. You go up and down, down, down, until...DOH! Your r

VLF1 • 5 Take a quick look at the schematic. The low frequency signal from your antenna is fed into J1. It passes through a low-pass filter made up

VLF1 • 6 capacitor polarity, transistor shapes, dotted or notched ends of IC's, and so forth.)

VLF1 • 7 VLF1 PARTS LIST Sort and “check off” the components in the boxes provided. We do our best to pack all our kits correctly but it is possi

VLF1 • 8  1 Red LED (D2)  1 4004 silicon diode (D1) Miscellaneous  1 Pushbutton Switch (S1)  3 RCA Jacks (J1, J2, J3)  1

VLF1 • 9 VLF1 PARTS LAYOUT DIAGRAM