Ramsey Electronics The `Logi' Log Periodic Antenna LPY915 manual

LPY 2 • 1 THE ‘ LOGI’ LOG PERIODIC ANTENNA Ramsey Electronics Model No. LPY915 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 MH z frequency range. Why settle for any old antenna… th is little baby “compresses ” the signal into a powe[...]

LPY 2 • 2 RA M SEY TRA NSM ITT ER KI TS • FM100B Profess ional FM Ste reo Transmi tter • FM25B S ynthesized Stereo FM Transmitter • MR6 Model Rocket Tr acking Transmi tter • TV6 Television Tr ansmitter R AMSEY RE CEIV ER KI TS • FR1 FM Broa dcast Receiver • A R1 A ir craft Band Recei ver • SR2 Shortw av e Recei ver • SC1 Shortwav [...]

LPY 2 • 3 Ramsey Pub lication No. MLPY915 Price $5.00 TABLE OF CONTENTS Introduction ... .............................. 4 Antenna D escription ................... 4 Standard Hook-u p ...................... 5 Low Frequency Modification ....... 7 Buildi ng a C orne r Re flector ......... 7 Buildi ng a R eflec tor Gri d ............. 9 LPY 91 5 Ret [...]

LPY 2 • 4 IN TRO DU C TIO N This small log periodic antenna, which we call the ‘ Logi’, is ideal f or getting the maximum performance out of any UHF to lo w frequency microwave w ireless system. Its dire ctional prop erties “co mpr es ses” the signal into a pow erful bea m that is 4 times more powerful in the desired direction. It is the [...]

LPY 2 • 5 STANDARD HOOK-UP Normal applications are well suited by the d efault performance of the unit without the need for cumbersome reflective elements. The standa rd wiring configuration is si mply to use the Logi as the complete anten na and merely add a means of connection for your radio. T he easiest method to inter face your antenna and r[...]

LPY 2 • 6  7. From the bottom side, slide the cent er co nductor of the coax through the open via at the front of the circuit board.  8. Gently ben d the rem aining cabl e to m ount flush alon g the tinned center ground strip.  9. Loo k clos ely at the gr ou nd conductor an d make sure there are no stray braid wires ha ng ing around. The[...]

LPY 2 • 7 high frequency end. BUILDIN G A CORNER REFLEC TOR Corner reflector an tennas have long been used by the Military and Radio Amateurs for high forward gain applications like field data links. Using a pr operl y si zed 90 ° angl e corner ref lect or will typically give you a 10 dB gain or higher over that of a s tand a lone di pole an ten[...]

LPY 2 • 8 parallel w ith th e seam, the antenna w ill not functio n properly. The boom length that positions the Lo gi at the focal point of the reflector is also critical factor. This will require a bit of trial a nd error to get things just right. Use a piece of PVC pipe (1/2” to 7/ 8” will work well) with a slot cut in th e end just big en[...]

LPY 2 • 9 experimented wi th the ISM19R and ISM24R and found that th ey work wonderfully with the Logi ! Look at the how the Bos s u sed a piec e of PVC and a f ew couple rs to f orm a boom . He cut a slot in one end of the PVC pipe to hold the Logi antenn a in place. Then he used a nylon wire tie at the end of the boom to squeez e the slotted pi[...]

LPY 2 • 10 LPY915 RETURN LOSS PLOT Return L oss (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 [...]

LPY 2 • 11 The Ramsey Kit Warranty Please read carefull y BEFORE calling or w riting in about your kit. Most problems can be solved wi thout contact ing the factory. Notice that this is not a "f ine print" warranty. W e want y ou to un derstand your rights and ours too! All Ramsey kits will work if assembled properl y. The ver y fact th[...]

LPY 2 • 12 Price: $5.00 Ramsey Pub lication No. MLPY915 Assembly and Instruction manual for: RA MSEY MO DE L N O . L PY 915 RAMSEY ELECTRONICS, INC. 590 Fishers Station Driv e Victor , New York 14 564 Phone (585) 924-4560 Fax (585) 9 24-4555 www.ramseykits.com REQUIRE D TOOLS • Soldering Iron Ramsey W LC-100, • Thin Rosin Core Solder Ramsey R[...]