====== AEG / Telefunken E 1800 ======
**VLF - HF Receiver E 1800**; manufactured by [[Telefunken|AEG - Telefunken, Ulm]].

There are several versions of the E1800 receiver system:
{{tablelayout?colwidth="80px,-,-"}}
|**[[E1800]]**|E 1800 with mechanical filters, original version| |
|[[E1800/3]]|E 1800 with mechanical filters, improved front end| |
|E1800/4|E 1800 with mechanical filters| |
|[[E1800A]]|E 1800 with DSP in the second intermediate frequency| |
|[[E800]]|scaled-down version of the E 1800 (not modular)| |

{{:images:telefunken-e1800-bw.jpg?direct&600|Telefunken E 1800}}
===== Technical data =====
  * [[Principle]]: [[Double conversion superhet]], [[IF]] 40.2 / 200 kHz
  * [[Operation modes]]: [[A1]] with [[BFO]], [[A3|AM (A3)]], [[A3J|SSB (A3J)]], [[ISB|ISB (B8E)]], [[FSK|F1 (FSK)]], [[F3|FM (F3)]]
  * [[Frequency range]]: 300 Hz - 30 MHz
  * [[Frequency display]]: [[digital display]], 10 Hz reading accuracy
  * [[Frequency memory]]: 100 memories
  * [[Signal strength indicator]]: LED bar
  * [[Signal processing]]: [[RF Gain]]
  * [[Features]]: LED bar tuning indicator (centre tuning), remote control; FSK functions.
  * [[Sensitivity]]: [[A3|AM (A3)]]
  * [[Selectivity]]:
     * **E 1800**: 7 filters from 0.1 / 0.15 / 0.3 / 0.6 / 1.0 / 1.5 / 3 / 6 / 10 kHz / +3 / -3 kHz.

==== Power supply ====
  * [[Mains operation]]: 115 / 230 V
  * [[Batteries]]: 24 V DC

==== Dimensions ====
  * 433 x 132 x 465 mm, 16 kg

==== Accessories ====
  * TZ-1710 radio telegraphy demodulator for F7B
  * DE-1710/2 ESB - demodulator for F1B, F1C, F3B, F7B
  * AD-1710 Antennas - Diversity 

===== Operation =====
The E 1800/3 receiver is mounted in a 19" rack.

At the top of the front panel there is a row of LED indicators.\\ 
Below this, from the left, are the keys for controlling the memory and scan functions, and the numeric keypad for direct frequency entry.

Below the digital frequency display (which shows the working frequency to within 10 Hz) are the keys for storing and recalling memory and the tuning knob. To the right of this is the bandwidth display and the two buttons for selecting the wider and narrower IF filter, and below that the monitor speaker.

At the top right are the LED bar displays, the left one can be used to display the signal and the carrier (marked in red), the right one shows the HF or AF signal strength. Below this are the buttons for selecting the operation mode, the modes [[A1]], [[A3]], [[A3J|J3E (SSB)]], J7B, [[FSK|F1B (FSK)]], [[F3|F3 (FM)]] can be accessed directly. 

A row of buttons below it switches between automatic and manual RF control ([[AGC]]), selects antennas, etc. - The button on the far right activates the monitor speaker.

Below that are the rotary controls for volume control (AF Gain), RF gain (MGC) and [[BFO]], the **STANDBY** switch at the bottom right is the main switch.

===== Technical principle =====
 \\ 

==== Components ====
The set is completely solid state.

==== Development ====
The Telefunken E1800 was launched in 1985 and was soon considered by experts to be the world's best receiver. This was followed by the E1800/3 version with an improved HF front end and, in about 1994, the E1800/A version with digital signal processing in the second intermediate frequency. The IF filters can be programmed by software in this [[DSP]] technology and replaced the mechanical filters on the 200 kHz [[IF]] of the E1800.

A slimmed-down version of the E1800 is the Telefunken [[E800]].

The receiver exists with different company names on the front panel, from Telefunken, to AEG - Telefunken, DASA, EADS - the company has had different owners over the last twenty years.

{{gallery>:images?telefunken-e1800*.jpg&0&80x80&lightbox&showtitle&titlesort}}

===== Technical documents =====

==== Further information ====
  * [[https://www.radiomuseum.org/r/telefunken_allwellenempfaenger_e1800.html|Telefunken E 1800 on the website of www.radiomuseum.org]]