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Most were in large coastal stations that provided worldwide ship-to-shore message handling via RCA Radiograms.
Although single receiver operation was common, RCA/RMCA also utilized the AR-88 at installations in a triple diversity receiver designated the DR-89.
of America's radio station KPH during the late forties, through the fifties and even into the sixties.
Photo from KPH History website: greatest communications receiver creation was the AR-88, a receiver that achieved its renown by providing top performance and high reliability in service as a surveillance and intercept receiver during WWII and later as a "workhorse" for the RCA and Radiomarine Corporation of America coastal stations, usually in triple diversity receivers that provided world-wide ship-to-shore message handling.
This was due to the provisions in the Lend-Lease Act which stated that materiel had to be either returned or destroyed.
In just one incident, a load of AR-88 receivers was "dumped" into an abandoned well by USA forces after the war ended.
The easy availability of AR-88s made them a popular amateur receiver in the 1950s and 1960s.
By the late-1950s and early-1960s, the AR-88 was showing its age and the receivers must have become available to ham club stations as it was very common to QSO Russians on 20M CW who were using an AR-88 for the station receiver. - After WWII, RCA and Radiomarine Corporation of America (a division of RCA that handled all of RCA's maritime radio business and operations) continued to use the AR-88 and its variants in their own installations for various purposes.Some sources even indicate that RCA had made it clear they did not want to see the receivers back in the USA for any reason.