Home |
Search |
Today's Posts |
#2
![]() |
|||
|
|||
![]()
Most interesting story. I suspect that this may have been the
precursor to CIA's Foreign Broadcast Information Service (FIBS...pronounced by those in the trade as Fibbis). CIA has these overt monitoring posts to pick up broadcasts from a whole host of stations. These are transcribed and translated into English and put in a daily summary. They are unclassified and freely disseminated at least within government. They are quite distinct from monitoring for intelligence purposes and totally different personnel participate. The FBIS folks are often foreign nationals hired as contract workers and as such do not participate in intelligence analysis or see intelligence product (except for CIA's cleared managers.) On a humorous note, early in my ham career about 50 years ago, there was another kind of beverage antenna. CQ magazine published a story on building a 40 meter vertical antenna by soldering end to end sufficient numbers of beer cans to reach the required 32 feet. Beer cans I guess were made of ferrous products back then (I was too young to drink at the time.) Several letters to the editor pointed out that the same thing could have been accomplished by 32 feet of aluminum tubing which of course was true. I think the same article also had an accompanying matching coil made out of semi-flexible copper tubing which the author said he straightened out prior to coiling in the appropriate size in what he described at "the time honored method." What he did was secure one end of the tubing to a vise on a workbench in his garage, secured the other end somehow (don't remember exactly how he did this) to his automobile and then straightening the tubing by slowly driving forward. Several follow-on stories appeared following publication, most dealing with the process of acquireing the requisite number of beer cans. One author did what today we would call a blog as he tried to acquire the cans all at once by drinking the contents. As the story progressed, his written words became more and more unintelligible. I am far too young to know about these WW II stories first hand (I was born in 1942), but I did have a long career in Signals Intelligence and I had heard some similar stories from my earliest supervisors, most of whom were WW II veterans. Thanks for sharing this with us. Jon W3JT On Thu, 22 Sep 2005 13:51:56 -0400, Walter Maxwell wrote: As a monitoring officer with the Radio Intelligence Division (RID) of the FCC in Hawaii during WW2 I was privy to some interesting situations. Our State Department was of course aware of the operations occurring in the Pacific Theater. The people there were also aware of the propaganda being spewed by the Japanese short-wave broadcasters. But State was curious concerning what the Japanese living on the homeland were being told-were they being told the truth, or the same propaganda as told on the short-wave broadcasts, or a totally different story. State asked the RID to determine whether we could obtain such information. We cruised the AM broadcast band and found several nighttime signals from Japanese mainland stations, but most were too weak to copy. However, JOAK, Tokyo, on 650 KHz was S9, but there was a problem in copying it. KFI, Los Angeles, was also on 650 KHz with an S9 signal-copying intelligence from JOAK was impossible. How can we eliminate, or reduce KFI's signal level. A Beverage Wave antenna, perhaps? We then proceeded to the northern portion of Oahu and constructed a Beverage one-half mile long, five feet above ground, aimed at Tokyo, and terminated with a 1000-ohm pot resistor to ground at the Tokyo end. We discovered that by varying the pot resistance we could null the KFI signal to almost zero. The resistance terminating the Beverage that produced the null was around 600 ohms. Because the matching resistive termination rendered the Beverage a traveling-wave antenna with no standing wave, the signal from JOAK was terminated by the input of our receiver, while the signal from KFI was dissipated in the matched resistance at the Tokyo end of the Beverage-no KFI signal reflected toward the receiver. Voila-JOAK was perfectly readable for recording! We sent the first recording to Washington, and State was delighted-requesting that we continue recording JOAK continuously. Consequently, our recordings were flown daily to Washington from Hickam Field in Honolulu. We were left in the dark concerning the information on the recordings, and how it affected the War effort, because State didn't share it with us. But it must have been pretty good, because State was on our case every day to make sure we sent them the recordings. Walt, W2DU |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Questions -?- Considering a 'small' Shortwave Listener's (SWLs) Antenna | Shortwave | |||
LongWire Antenna | Shortwave | |||
Understanding Shortwave Radio Listening and Antenna Design and Construction | Shortwave | |||
EH Antenna Revisited | Antenna | |||
Poor quality low + High TV channels? How much dB in Preamp? | Shortwave |