Siemens RRU800 Radio Relay Device 610MHz to 960MHz UKT Block Circa 1960's

  
Seimens Radio Relay Device RRU-800. I know very little about this, apart from what I could find on the internet. When there was no optical visibility between the end stations, or the distance between them was large, a maximum of 12 radio-relay intermediate stations were installed on one line. The device worked in the frequency range from 610MHz to 960MHz, and the operating frequency was set manually, continuously, whereby the automatic system regulates the frequency in the range of +/- 400kHz from the operating frequency. The distance between the receiving and transmitting frequency, when working with a common antenna (basic mode of operation), had to be at least 40MHz. At the same time, the frequency of the receiver must not be higher by 50, 75 and 100 MHz than the frequency of the transmitter. Modulation is frequency with maximum deviation: for 4-channel operation +/-45kHz, 12-channel operation +/-14kHz and 24-channel operation +/-10kHz. The output power of the transmitter was about 10W and was obtained from two Siemens transmitter UHF triodes 2C39BA. This power was radiated by a double helicoid antenna whose gain, depending on the frequency, was from 12.5dB to 15.9dB.

The antenna was attached to the antenna mast SM-17 with a maximum height of 17 meters. "The UKT block was placed in a box marked "I. Contains UHF transmitter and receiver parts, as well as a test oscillator.

It was made using waveguide technology and constructed so that the controls and transmitter assemblies are on the left, and the receiver and test oscillator are on the right. It was connected to the amplifier and rectifier block with connecting multi-core cables. The antenna was also connected to this block via the antenna cable. One of the pictures shows a complete RRU800 set, I've only got the top part that I've highlighted in yellow but it shows what the complete setup looks like. The part listed is the'UKT' block and contains the UHF transmitter and receiver.

The only missing part is the rear cover, but looking at the way this thing has been constructed it is a beautiful piece of mechanical engineering, I've had it as a display piece for quite a while as it is an interesting thing to look at! Made in the 1960's It measures 54cm x 33cm x 18cm deep and weighs an absolute tonne! I can just about pick it up, so this will be a collection only listing.

This item is in the category "Collectables\Militaria\Surplus/ Equipment\Field Gear". The seller is "bad-dog-designs" and is located in this country: GB. This item can be shipped to United Kingdom.

• Type: Field Gear