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+====== E-664: Rohde & Schwarz ESM 500A ======
+**E-664**, [[VHF]] / [[UHF]] receiver **Rohde & Schwarz ESM-500A**; developed and produced by [[Rohde Schwarz|Rohde & Schwarz, Munich]].
+The [[VHF]] / [[UHF]] receiver ESM 500A from [[Rohde & Schwarz]] was used as standalone monitoring receiver with army designation **E-664** and also as receiver of the [[P-736]] VHF direction finding system.
+{{:images:e-664-cplt.jpg?400|E-664: Rohde & Schwarz ESM 500}}
+===== Technical Data =====
+  * [[Principle]]: [[single conversion|Superhet]]; [[IF]] 10,7 MHz
+  * [[Modes]]: [[A1]], [[A3J]], [[A3|AM (A3)]], [[F3|FM (F3)]], Puls
+  * [[Frequency range]]: 20 - 1000 MHz (A variant); 20 - 500 MHz (B variant)
+  * **Digital frequency display**: digital display 1 kHz
+  * [[Sensitivity]]: / [[Selectivity]]: 8 / 15 / 30 / 100 kHz
+==== Power Supply ====
+  * [[Mains]]: 100 / 120 / 220 / 240 V AC
+  * [[Accumulator / batteries]]: the receiver can be operated from 19 - 30 V DC
+==== Dimensions ====
+  * 483 x 132 x 506 mm, 18 kg (rack version)
+==== Accessories ====
+  * Remote receivers ESM 508K (20 - 87 MHz), ESM 517K (68 - 174 MHz), ESM 540K (220 - 450 MHz), from one power supple / control unit (GX500) up to eight remote receivers can be controlled.
+  * **Panoramic display EZP**
+----
+{{:images:e-664-front.jpg?direct&600|E-664: Front view}}
+===== Operation =====
+The ESM 500 VHF / UHF receiver in a 19” cabinet can be used as a monitoring receiver and replaced the [[E-652|ESM2]] receiver in the [[P-736]] VHF / UHF direction finder .
+The receiver covers the entire VHF / UHF range from 20 - 1000 MHz , for SSB reception, the tuning step sizes can be switched down to 10 Hz.
+The 99 memories can also be written externally via an IEC / IEEE bus or RS232C interface, a scan function allows to scan the memory channels - this functionality anticipates the possibilities found in a scanner receiver from the nineties.
+===== Technical Principle =====
+==== Semiconductors ====
+The set is completely solid state.
+==== Development ====
+==== Field use ====
+The [[VHF]] / [[UHF]] receiving system ESM-500A made by [[Rohde & Schwarz]] was not only part of the [[P-736]] VHF / UHF direction finding system, but it was also used separately as a monitoring receiver with the army designation **E-664**.
+{{gallery>:images?e-664*.jpg&0&80x80&lightbox&showtitle&titlesort}}
+==== Manuals ====
+  * {{ :manuals:e-664-rohde_schwarz_esm500.pdf |Prospekt Rohde & Schwarz ESM-500A}}
+==== Additional information ====