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====== P-733 ======
**RF - direction finding system P-733**, **Plath SFP 5200**; manufactured by [[Plath|C. Plath GmbH, Hamburg]].

The [[Plath]] - SFP 5200 HF direction finding system partially replaced the [[P-732]] / SFP 5000 system for HF radio monitoring by the EKF; it was used from 1990 to approx. 2007.

===== Technical data =====
{{ :images:p-733-plath-sfp-5200-cplt.jpg?direct&400|}}  
  * [[Principle]]: Visual direction finder **Plath SFP 5200**
  * [[Receiver]] [[Plath]] **SFP 5200**, consisting of **PET 5200** receiving section and **SAG 5200** viewing & display section: [[Superhet]], [[IF]] ?
  * [[Operation modes]]: [[A1]], [[A2]], [[A3|AM (A3)]], [[A3J|SSB (A3JU/O]], [[F3]]
  * [[Frequency range]]: 0.1 - 30 MHz
  * [[Sensitivity]]: [[A3|AM (A3)]] / [[selectivity]]

==== Power supply ====
  * [[Mains operation]]: 220 V AC mains

==== Dimensions ====

==== Accessories ====
  * **Direction finding antenna**: U-Adcock DF antenna Telefunken AK1200D

===== Operation =====
The P-733 / **Plath SFP 5200** system consists of the **PET 5200** receiver section and the **SAG 5200** display section, the **PSO 5200** synthesizer, **PZF 5200** IF processor and **BET 5200** control and input keypad in one unit.

The 8/16-fold U-Adcock antenna AK1200D from Telefunken is used as the DF antenna, with an inner base with a diameter of 8 m and an outer base with a diameter of 36 m. It was partially replaced in 2003 by Plath U646 antennas (diameters 10 / 40 m).

The systems remained in use until 2007 and were liquidated in 2008 and replaced after a transitional period by the Plath DDF 5050 (SFP 5050) digital direction finding system, which got the designation P-765.

===== Technical principle =====

==== Tube assembly ====

==== Development ====

==== Deployment ====
Thirteen of the SFP 5200 HF direction finding systems developed by Plath after 1983 were acquired in 1990 for the EKF's electronic radio reconnaissance; the P-733 system remained in service until 2007 and was liquidated in 2008.

{{gallery>:images?p-733*.jpg&0&80x80&lightbox&showtitle&titlesort}}

===== Technical documentation =====

==== Further information ====
  * [[http://armyradio.ch/radio-d/p-733.htm|P-733 at www.armyradio.ch]]
  * [[https://www.hamfu.ch/de/geraete/geraet.php?id=135|E-600 / E39 on the Hamfu website]]
  * [[http://www.radiomuseum.org/r/autophon_e39_e600.html|E-600 / E39 on the website of www.radiomuseum.org]]