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Ramsey Electronics LPY2 manual

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Table of contents for the manual

  • Page 1

    LPY 2 • 1 THE ‘ LOGI’ LOG PERIODIC ANTENNA Ramsey Electronics Model No. LPY2 Constructed on rugged FR -4 material, it requires no tuning an d has no fragile antenna elements to break or twist! Covers the entire 900 to over 2,500 MH z frequency range. Why settle for any old antenna… th is little baby “compresses” the signal into a powerf[...]

  • Page 2

    LPY 2 • 2 RA M SEY T RA N SMIT T ER KIT S • FM100B Professional FM Stereo Transmi tter • FM25B S yn thesiz ed Stereo FM Transmitter • MR6 Model Rocket Track ing Transmitter • TV6 Television Tra nsmitter RAMSE Y RECEI VER KITS • FR1 FM Broa dcast Receiver • AR1 A ircraft Band Recei ver • SR2 Shortwa v e Receiver • SC1 Shortwav e Co[...]

  • Page 3

    LPY 2 • 3 Ramsey Publication No. MLPY2 Price $5.00 TABLE OF CONTENTS Introduction ... .............................. 4 Antenna Descrip tion ................... 4 Standard Hook-up ...................... 5 Low Frequency Modification ....... 7 Buildi ng a C orner Re f lecto r ......... 7 Buildi ng a R eflec tor Gri d ............. 9 LPY 2 Re turn L [...]

  • Page 4

    LPY 2 • 4 INTR ODU CTI ON This small log periodic antenna, which we call the ‘ Logi’, is ideal for getting the maximum performance out of any UHF to lo w frequency microwave wireless system. Its directional pr operties “com pres ses” the signal into a powerful beam that is 4 times more powerful in the desired direction. It is the ideal an[...]

  • Page 5

    LPY 2 • 5 STANDARD HOOK-UP Normal applications are well suited by the default performance of the unit without the need for cumbersome reflective elements. The standard w iring configuration is simply to use the Logi as the co mplete antenna and merely add a means of connection for your radio. T he easiest method to inter f ace your antenna and ra[...]

  • Page 6

    LPY 2 • 6 LOGI LOW FREQUE NCY MODIFICATION If your radio system requires DC isolati on or y ou pl an to use y our Lo gi below 900 MHz, the small conne cting traces nea r the rear of the antenna shou ld be cut. B y removing these traces y ou c an extend the eff ective frequency range down to 825 MHz. You will however wind up with some ‘lumps’ [...]

  • Page 7

    LPY 2 • 7 frequency you plan to use. In the case of the Logi, 900 MHz was used to calculate the dimensions. A gain of 10 dB can be obtained with a reflector side length of one w avelength. A two wavelength reflector can b e used to achieve upwards of 12 dB gain! It just means y ou’ll have a bit more wind resistance to f actor in. The positionin[...]

  • Page 8

    LPY 2 • 8  1 Ramsey ISM19R or ISM24R (or equivalent)  1 16 1/2” piece of 1/2” PVC pipe  1 1/2” to 1” PVC coupler (non threaded)  1 3/4” to 1” PVC coupler (thread ed on the male 3/4” side only)  1 can of PVC cement  3 4” minimum nylon wire ties 10.0" -12. 0" Cut a slot i nto th e PVC b oom. Insert the Lo[...]

  • Page 9

    LPY 2 • 9 LPY2 mounting Boom for a Grid Reflector LPY2 mounted on a Grid Reflecto r[...]

  • Page 10

    LPY 2 • 10 LPY2 RETURN LOSS P LOT Return Lo ss (dB) VSWR Return Loss (dB) VSWR Return Loss (dB) VSWR 1.0 17.391 11.0 1.785 21.0 1.196 2.0 8.724 12.0 1.671 22.0 1.173 3.0 5.848 13.0 1.577 23.0 1.152 4.0 4.419 14.0 1.499 24.0 1.135 5.0 3.570 15.0 1.433 25.0 1.119 6.0 3.010 16.0 1.377 30.0 1.065 7.0 2.615 17.0 1.329 35.0 1.036 8.0 2.323 18.0 1.288 4[...]

  • Page 11

    LPY 2 • 11 The Ramsey Kit Warra nty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved wit hout contacting the factory. Notice that this is not a "f ine print" warranty. W e want you to understand your rights and ours too! All Ramsey kits will work if assembled properly. T he very fact that yo[...]

  • Page 12

    LPY 2 • 12 Price: $5.00 Ramsey Publica tion No. MLPY2 Assembly and Instruction manual for: RAMS EY MO DEL NO . LP Y2 RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, N ew York 14564 Phone (585) 924-4560 Fax (585) 924-45 55 www.ramseykits.com REQUIRED TOOLS • Soldering Iron Ramsey WLC-100, • Thin Rosin Core Solder Ramsey RTS12 • Ne[...]