Ramsey Electronics The `Logi' Log Periodic Antenna LPY915 Assembly And Instruction Manual

Log periodic antenna

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THE 'LOGI'
LOG PERIODIC
ANTENNA
Ramsey Electronics Model No.
Constructed on rugged FR-4 material, it requires no tuning and
has no fragile antenna elements to break or twist! Covers the
entire 900 to over 2,500 MHz frequency range.
Why settle for any old antenna... this little baby "compresses"
the signal into a powerful beam that is 4 times more powerful in
the direction you desire!
Easy hookup to your Receiver or Transmitter
Small thin size with excellent broadband performance
Solid 6 dB gain from 900 to over 2,000 MHz!
VSWR less than 2:1 - great for transmitters up to 10 Watts!
Easily mounted by itself or makes a great feed for reflector
dishes
• Construction ideas for a wideband corner reflector and a
'grid' reflector dish are covered in the manual!
• Very directional - ideal for point-to-point links
LPY2 • 1
LPY915

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Summary of Contents for Ramsey Electronics The `Logi' Log Periodic Antenna LPY915

  • Page 1 THE ‘LOGI’ LOG PERIODIC ANTENNA Ramsey Electronics Model No. Constructed on rugged FR-4 material, it requires no tuning and has no fragile antenna elements to break or twist! Covers the entire 900 to over 2,500 MHz frequency range. Why settle for any old antenna… this little baby “compresses”...
  • Page 2 LPY915 INSTRUCTION MANUAL Ramsey Electronics publication No. MLPY2 Rev 1.1 COPYRIGHT 2001 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America.
  • Page 3: Table Of Contents

    Building a Corner Reflector ... 7 Building a Reflector Grid ... 9 LPY915 Return Loss Plot ... 10 Return Loss vs. VSWR Chart ... 10 Warranty ... 11 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com...
  • Page 4: Introduction

    INTRODUCTION This small log periodic antenna, which we call the ‘Logi’, is ideal for getting the maximum performance out of any UHF to low frequency microwave wireless system. Its directional properties “compresses” the signal into a powerful beam that is 4 times more powerful in the desired direction. It is the ideal antenna for scanners, wireless LANs, and other wireless devices.
  • Page 5: Standard Hook-Up

    STANDARD HOOK-UP Normal applications are well suited by the default performance of the unit without the need for cumbersome reflective elements. The standard wiring configuration is simply to use the Logi as the complete antenna and merely add a means of connection for your radio. The easiest method to interface your antenna and radio is through the use of a coaxial cable with a pre-mounted connector.
  • Page 6: Low Frequency Modification

    7. From the bottom side, slide the center conductor of the coax through the open via at the front of the circuit board. 8. Gently bend the remaining cable to mount flush along the tinned center ground strip. 9. Look closely at the ground conductor and make sure there are no stray braid wires hanging around.
  • Page 7: Building A Corner Reflector

    high frequency end. BUILDING A CORNER REFLECTOR Corner reflector antennas have long been used by the Military and Radio Amateurs for high forward gain applications like field data links. Using a properly sized 90° angle corner reflector will typically give you a 10 dB gain or higher over that of a stand alone dipole antenna.
  • Page 8: Building A Reflector Grid

    parallel with the seam, the antenna will not function properly. The boom length that positions the Logi at the focal point of the reflector is also critical factor. This will require a bit of trial and error to get things just right.
  • Page 9: Building A Reflector Grid

    experimented with the ISM19R and ISM24R and found that they work wonderfully with the Logi! Look at the how the Boss used a piece of PVC and a few couplers to form a boom. He cut a slot in one end of the PVC pipe to hold the Logi antenna in place.
  • Page 10: Lpy915 Return Loss Plot

    RETURN LOSS VERSUS VSWR - CONVERSION CHART Return Loss VSWR (dB) 17.391 8.724 5.848 4.419 3.570 3.010 2.615 2.323 2.100 10.0 1.925 The LPY2 offers exceptional wide band characteristics from 900 MHz to 2.6 GHz and can be used as a Receive or Transmit (10 Watts max) antenna! Standard guidelines for antenna systems: •...
  • Page 11: Warranty

    But on rare occasions a sour component can slip through. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. Defective parts will be replaced promptly at our expense. If you suspect any part to be defective, please mail it to our factory for testing and replacement.
  • Page 12: Victor, New York

    • Desoldering Braid Price: $5.00 Ramsey Publication No. MLPY915 Assembly and Instruction manual for: RAMSEY MODEL NO. LPY915 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 Fax (585) 924-4555 www.ramseykits.com LPY915 LOG PERIODIC ANTENNA...

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