30 51J4's must have been a sight to behold! Probably got hot in that
I have a picture of a navy station in Antarctica that had a bank of R390's.
In 1998 when I was in Switzerland, I saw a big LPDA in the middle of
farm country. I later figured that this belonged to Bern Radio, the
"coast station". They have a nice web site.
Joel R. Hallas wrote:
> During my US Army days in DL land (1963-65), our embassy folk had large LPDA
> arrays on the roof at the consulate building in Frankfurt used to monitor sw
> and mw foreign broadcasts. There was a room with about 30 51J4s in racks
> filling most of one wall.
> Each night they would ship, via TTY, a translated summary of the received
> news reports. It would go through our VHF/microwave network (long gone,
> including the 300 foot tower I sometimes had to change the bulbs on!) to the
> UK and to the US, probably by cable. It was reputed to end up on the
> president's desk every morning.
> We used to keep a TTY machine on the circuit, so we knew what was happening
> before JFK and later LBJ did!
> Regards, Joel
> Joel R. Hallas, W1ZR
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:email@example.com]
> On Behalf Of Ken Brown
> Sent: Friday, December 07, 2007 8:58 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Embassy Antennas
>> Only in very few outlying Embassies are there any over the air type
> communications. Everything is or was on line encrypted. Basically any
> outside wiring or antennas not allowed.
> I have seen log periodics on buildings in Europe. I notice those kinds
> of things. Most times, when I have investigated to see what is in the
> building on which the antenna is mounted, it has been a foreign embassy.
> (foreign to the country I was in) I would expect them to use encryption
> whether by wire or by wireless, and to use wire most of the time. I
> would think they might want to have a backup to wire. Wires after all
> can be cut. Many of the installations I have seen may well be left over
> from the days when satellite comm links were not commonly available.
> Even so, I think it would be wise to maintain an HF backup to the
> satellite system. Additionally, some scheduled transmissions, perhaps
> sending null messages, would be a good idea to make sure the system
> works when it is really needed, and so that the sudden resumption of
> transmission after none at all, would not reveal anything. Much
> intelligence can be gleaned from traffic analysis, without decryption of
> the traffic.
> DE N6KB
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