====== AEG / Telefunken E 800 ======
**VLF - HF Receiver E 800/2**; manufactured by [[Telefunken|AEG - Telefunken, Ulm]].

The receivers of the E1800 family came in different versions:
{{tablelayout?colwidth="80px,-,-"}}
|[[E1800]]|E 1800, original version| |
|[[E1800/3]]|E1800 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 E1800| |

{{:images:telefunken-e800.jpg?direct&600|Telefunken E 800/2}}
===== Technical data =====
  * [[Principle]]: [[Double conversion superhet]], [[IF]] 40.2 / 200 kHz
  * [[Operation modes]]: [[A1]], [[A3|AM (A3)]], [[A3J|SSB (A3J)]]; [[FSK|F1]], [[F3|FM (F3)]] with demodulator TD 800
  * [[Frequency range]]: 10 kHz - 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); FSK functions.
  * [[Sensitivity]]: [[A1]] 0.4 μV; [[A3J]] 3 μV ; [[A3|AM (A3)]] 10 μV
  * [[Selectivity]]: 7 filters from 0.1 / 0.15 / 0.3 / 0.6* / 1.0 / 1.5* / 3* / 5 / 6* / 10* kHz / +3* / -3* kHz (* included in standard version).

==== Power supply ====
  * [[Mains operation]]: 115 / 220 / 230 V

==== Dimensions ====
  * 433 x 132 x 465 mm, 9.5 kg; in optional desktop cabinet 535 x 170 x 485 mm, 15 kg

==== Accessories ====
  * TD 800 demodulator for F1B, F1C, F3E, F7B (option 01); B8E demodulator (ISB, option 04)

{{:images:telefunken-e800-front.jpg?direct&600|Telefunken E 800/2}}
===== Operation =====
The E800/2 receiver is housed in a 19" rack, it is a somewhat slimmed-down version of the [[E1800]]; the receiver is not modular, but most of the circuitry is located on the main circuit board.

On the front panel there is a row of LED indicators at the top.\\ 
Below that, 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 with an accuracy of 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.

At the top right are the LED bar displays, the left one can be used to display the signal and the carrier (marked red), the right one shows the HF or AF signal strength. Below are the buttons for selecting the operation mode, the operation modes [[A1]], [[A3]], [[A3J|J3E (SSB)]] and with installed option 01 [[FSK|F1B (FSK)]], [[F3|F3 (FM)]] can be accessed directly.\\ 
The buttons below switch between automatic and manual RF control (AGC), activates the squelch, etc; the **STANDBY** switch to the right is the main power switch.

On the right is the monitor speaker, which is activated with the button at the top right; below it is the rotary control for volume control (AF Gain) and the headphone jack. 

===== 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, around 1994, the [[E1800A]] version with digital signal processing in the second intermediate frequency, the IF filters can be programmed in software in this [[DSP]] technology and replaced the mechanical filters on the 200 kHz [[IF]] of the E1800.

The Telefunken **E800** is a slimmed down version of the E1800, with the slightly longer response time it could be used for listening purposes without any problems, for direction finding one used the expensive siblings with the faster processor.

Unlike the E1800, the E800 is not modular, it has a motherboard, power supply unit and front panel elements. 


{{gallery>:images?telefunken-e800*.jpg&0&80x80&lightbox&showtitle&titlesort}}

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

==== Further information ====
  * [[https://www.radiomuseum.org/r/telefunken_vlf_hf_receiver_e_8002.html|Telefunken E 800 on the website of www.radiomuseum.org]]