Check the listing for details. AN / PPN-18 Transponder Set – Forward Air Control. Condition: Used. Listed at 497.94 USD. * Please note that this item is for USA SALE ONLY. I CANNOT EXPORT this item from the USA, and sale MUST BE USA PAYMENT & USA DELIVERY. No EXPORT of any kind. We reserve the right to cancel the sale based on suspicion of export via individual or third party. * Nice AN/PPN-18 (S/N# 069) Transponder Set – Forward Air Control. This unit was manufactured by Vega Precision Laboratories for the United States Marine Corps on contract # M00027-70-C-0014 for use in the Vietnam War. This Unit is quite compact and beautifully engineered and manufactured. This item was constructed with the finest American made components available at the time with Late 1960 – early 1970’s state-of-the-art technology. This item is in Fair - Good overall physical and cosmetic condition. The AS-2544/PPN-18 Antenna IS Included, it is located under the cover marked Antenna Storage. This unit was made to operate on internal batteries (the battery box is NOT included, I DO NOT HAVE), or an external 28Vdc power source. These systems were produced for the USMC by Both Motorola and Vega Precision Labs, Inc. THIS particular unit was produced by Vega. I am including some information that I found on the Internet that I believe pertains to the AN/PPN-18: The AN/PPN-18 is a crucial element in close air support missions; it provides a signal to an attacking aircraft thus enabling the aircraft: to home in on ground targets in all weather conditions. The Marine Corps, as the designated Department of Defense Primary Inventory Control Activity for this item, is responsible for procuring all the military departments' requirements. Currently, the Army (Special Forces) and Navy (Seals) have an urgent need for…. The AN/PPN-18A Transponder set is a portable, watertight radar transponder designed for use as a positive troop location and identification device during forward air control (FAC) operations. When triggered by a radar pulse, the transponder transmits a coded RF response pulse. Operation is automatic once the operator turns the unit on and selects one of six codes to be used in the response pulse. The transponder has external operating controls and indicators. The battery power source can be replaced without opening the transponder case assembly. Capability: The AN/PPN-18A is a J-Band beacon used for offset bombing primarily with the F-111. Maximum range is approximately 50 miles. Frequency Range: 16.25 to 17.0 GHz Weight: 11 pounds Manufacturer: Motorola Government Electronics Div. Scottsdale, AZ This Item is untested and is sold for use just as a MOCK-UP System or as an experimenter item. Per eBay protocols it is sold for PARTS OR REPAIRS, and as USED, Strictly: AS-IS. The attached pictures form part of the description AND the description is a “BEST EFFORT” on my part so please BID ACCORDINGLY. Please note that this item is for USA Sale only. I CANNOT EXPORT these items from the USA, and sale MUST BE USA PAYMENT & USA DELIVERY. No EXPORT of any kind. We reserve the right to cancel the sale based on suspicion of export via individual or third party. When WELL PACKAGED, the shipping box dimensions are 14” X 10” X 7” and the approximate weight is 12 Lbs., it will ship from zip code 92653. Please note that I am selling this item for PARTS or REPAIRS and as USED, STRICTLY AS-IS. I ship within 3 days of receipt of funds. Items will ship upon receipt of guaranteed funds.