Quote:
Originally Posted by kraznyi_oktjabr
I have question on following text from U.S.S. BAYA (SS-318) FOURTH WAR PATROL REPORT27 April 1945 at 0235:
"APR contact on 305 mcs., 200 TRF, strength 5. This contact was followed by jamming which effectively blacked both united of APR and completely blacked SD."
Could someone explain what are APR, mcs, TRF and this "strength 5"? Also what kind of jamming gear Japanese would be using?
EDIT: Okay I missed section where APR was mentioned to be somekind of radio, my bad. Would still like to hear more about it.
Thanks!
Tim
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Platapus beat me to a reply with some good info. To add to that, starting in late 1944, some submarines were equipped with the APR series radar detection equipment. It consisted of both a receiver and a pulse analyzer. It served mostly as an early warning set, basically to let the crew know that there was an enemy radar set out there working. Due to the limitations of the gear, getting a bearing was problematic. Later refinements in antenna placement allowed a rough bearing to be obtained, but this often required turning the entire boat.
I would be very surprised to learn that the IJN was using any sort of active jamming gear. This technology was in its infancy and even the USN did not possess it at this point. Probably what the
Baya was seeing was unintentional. A Japanese radar operating on a frequency that was close to that of the SD (especially if it was more powerful) would cause interference on the screen and muck up the reception, essentially "jamming" it.