Ramsey-electronics DA25 Manual de usuario

DA25 • 1 BROADBAND DISCONE ANTENNA KIT Ramsey Electronics Model No. DA25 Looking for a broadband antenna with a full 360 degree coverage? D

DA25 • 10 PARTS SUPPLIED WITH YOUR DA25 KIT  1 3 Qt. funnel “cone”  1 7 inch pie-plate (CAUTION, EDGES MAY BE SHARP!)  3 #6 – 32 x 1

DA25 • 11 DA25 DISCONE ANTENNA KIT ASSEMBLY Although we know that you are anxious to complete the assembly of your an-tenna kit, it is necessary to

DA25 • 12  1. Carefully “tin” the center conductor of the cable by adding a small amount of solder to the twisted center conductor. Use care not to

DA25 • 13 Now we are getting somewhere! All your careful preparation will pay dividends as we install the coax cable to the circuit board. We did thi

DA25 • 14  6. Install the circuit board assembly to the funnel cone as shown. Use care to center the circuit board before you solder the assembly co

DA25 • 15  8. Solder the center conductor wire into place on the disk section of the an-tenna. Trim off any excess lead that is protruding from the

DA25 • 16 INSTALLATION OF THE ANTENNA MOUNT When you are satisfied that your solder connections are “just right”, we will install the PVC antenna ma

DA25 • 17 USING YOUR DA25 DISCONE ANTENNA Now we are ready for the moment of truth, the running of your discone an-tenna. Were pretty sure by now you

DA25 • 18 CONCLUSION We sincerely hope that you enjoy the use of this Ramsey product. As always, we have tried to compose our manual in the easiest,

DA25 • 19 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting t

DA25 • 2 RAMSEY TRANSMITTER KITS • FM100B Professional FM Stereo Transmitter • FM25B Synthesized Stereo FM Transmitter •

DA25 • 20 Price: $5.00 Ramsey Publication No. MDA25 Assembly and Instruction manual for: RAMSEY MODEL NO. DA25 RAMSEY ELECTRONICS, INC. 590 Fishers S

DA25 • 3 BROADBAND DISCONE ANTENNA KIT DA25 Ramsey Publication No. MDA25 Price $5.00 TABLE OF CONTENTS Introduction ...

DA25 • 4 INTRODUCTION In today’s ever growing “wireless” society, it almost seems a bit ironic that antennas have become less and less the topic of i

DA25 • 5 before we snapped the rope, the sound waves would arrive much quicker than the “rope wave” would. In the case of radio waves, the rate at wh

DA25 • 6 What Are We Driving At? Time to pull some of that theory together and get some answers: Since: λ = v x T And T = 1 / f We can su

DA25 • 7 one radio frequency (or RF) cycle. Since the charge traverses the wire twice, the length of wire needed to permit the charge to travel the t

DA25 • 8 What About Impedance Matching and VSWR ? Another consideration with electromagnetic wave antennas is the “match” presented to either the rec

DA25 • 9 Ramsey offers two models of this particular antenna, one with no active components and the other with a low noise preamplifier to further