Marine Receiver – Eddystone 1837

Dear Sparks,

on this review some details about the marine receiver produed by Eddystone at the end of the 70s, no videos available on the web.

Country            Great Britain

Factory             Eddystone

Years                1977–1983 

Principle           Supereterodyne double / triple conversion; ZF/IF 1350/100 kHz

Bands               LW, MW, HF

Power supply   100-130; 200-260 Volts / battery 12; 24 Volts

Audio power      0.5 W

Materials            Metal rack

Dimensions (LxHxD)     483 x 133 x 334 mm / 19 x 5.2 x 13.1 inch


General coverage communication receiver covering 100 kHz – 31 MHz in nine bands AM, CW, USB/LSB, FSK optional. 840-1600 kHz segment single conversion, high stability frequency lock above 1600 kHz. Standard IF bandwidths 8/3/2,4/1,3/0,4 kHz. Digital readout 100 Hz resolution. Optional plinth speaker 989, optional panoramic unit 1061.

Weight                      16.8 kg / 37 lb 0.1 oz (37.004 lb)




Marine Receiver – RFT EKD 500

Dear Sparks,

here is a summary of the history of the East German factory RFT than one of her last receiver produced for East European market largely used in merchant marine communications:

VEB Funkwerk Dresden was a publicly owned company (VEB) in the city of Dresden during the times of the former DDR (East Germany). The company was founded under Russian occupation immediately after WWII, in 1945, and was initially known as Radio H. Mende & Co. Dresden. In 1948, it became a Volkseigener Betrieb (VEB) and was renamed to VEB Funkwerk Dresden . As the company was also part of the RFT consortium, it is also known as RFT Funwerk Dresden. Initially Funkwerk Dresden contentrated on the production of radio receivers for the domestic market, with bulk production starting in 1951. In 1962, the production of radios is cancelled and moved completely to Stern-Radio Staßfurt. From that moment on, the company concentrates on the production of measuring equipment and radio communication systems.
In 1969, Funkwerk Dresden is merged with two other VEBs, Vakutronik and Schwingungstechnik und Akustik Dresden, and moves on as VEB Meßelektronik Dresden (abbreviated as MKD).
A few years later, in 1972, the name ‘Otto Schön’ is added to the title and the company becomes known as VEB Meßelektronik ‘Otto Schön’ Dresden. This name lasts until the company is merged with the large VEB consortium Robotron in 1979, after which the name is changed to VEB Robotron-Meßelektronik ‘Otto Schön’ Dresden. On 30 June 1990, after a variety of problems in the supply chain, the company was dissolved in the light of the reunification of Germany .

Professional receiver  RTF  VEB  Funkwerk   DDR model EKD 500

10 kHz  – 30 MHz


keybord direct entry

triple PLL  synthesizer

16 selectable tuning steps

adjustable   BFO

all scan functions

filter bandwidth = 0,15/0,4/0,75/3,1/6  kHz

weight  25 Kg



The Lloyds and Maritime Communications

Dear Sparks,

from the Lloyds to Portishead Radio on the video below, enjoy our past!

Best regards,



Marine Receiver – Redifon R551N

Dear Sparks,

for long time this receiver has been employed on board merchant and passenger ships, it has been a great receiver but on the web there are not reviews and specifications, if any of you have detailed informations this article will be modified with your contribution:

This receiver was designed to a high specification and cover 10 kHz to 30 MHz with a resolution of 10 Hz, a sensitivity of 0.35 uV on the HF amateur bands and good selectivity due to 300Hz, 1 kHz and 3 kHz crystal filters.




Marine Receiver – Rohde & Schwarz EK 07

Dear Sparks,

on this review it is remembered one of the Rohde & Schwarz “Excellence” the receiver model EK 07, employed in several services, it found a great place in the marine communications and it has been for several years the receiver used in Norddeich Radio and other German coast radio stations as shown in the clip below, two clips are showed, in  the second one an EK07 under tests.


Double conversion superhet, 1st I.F. 3,3 MHz, 2nd I.F. 300 kHz

Analog dial, linear, accuracy ca. 1 kHz, coverage 500 kHz – 30,1 MHz AM, CW, SSB

Selectivity -6 dB
12 / 6 / 3 / 1 / 0.2 kHz
resp. for the EK 07 D
12 / 6 / 3 / 1.5 / 0.6 / 0.3 kHz




With it’s dimensions of 54 x 33 x 55 cm (frontpanel width is a bit more then the standard 19 inch rack) and it’s weight of 66,3 kg, the Rohde & Schwarz EK 07 is not only another huge receiver, it’s bigger and heavier then the Collins R-390 or the Siemens E-311, only Telefunken’s E-104 is quite a bit bulkier and heavier… But it’s good to have two handles on each side of the cabinet, to get it lifted up on my shelves, I needed the help of my oldest son, my wife considered the thing as a bit to heavy…
The receiver can be powered from different mains voltages from 110 – 235 V and has a power consumption of 130 Watts to keep all 27 tubes glowing.

The frontpanel with the two protection handles is dominated by the very impressive 34 cm wide dial window between the two large format instruments, below the mainfrequency dial with a turret arrangement, You find the small window for the kHz indicator dial and below all other controls, the huge main tuning knob and the band selector switch activating theturret tuner arrangement.
The band selector switches the separate shortwave bands, each of them in most cases three MHz wide, in the dial window, the respective part of the shortwave dial drum will be visible.
The receiver is tuned with main tuning knob, it’s outer ring has a 30:1 gear for fine tuning, the complete tuning mechanism can be blocked mechanically.
The left measuring instrument will display the A.F. level in position “600 Ohm” and the speaker output in position “16 Ohm”. The right instrument will display the R.F. level in uV. Just next to the signal strength meter, You find a small pushbutton whick can be turned 90 dregrees when depressed to lock, it will activate the 300 kHz crystal calibrator.

The R.F. signal coming from the antenna will first have to pass an automatic preselection stage with twelve passbands and after an amplifier stage a synchroneously tunes band pass. After this, it will be mixed to a first intermediate frequency of 3,3 MHz in the ranges V – XII and then to the second i.f. of 300 kHz, below 6 MHz, the signal is directly mixed to 300 kHz as first intermediate frequency. After having passed several amplifier stages and the i.f. filters for the six bandwidths, the signal is fed to the demodulator stage after the AGC control voltage has been generated.
A diode demodulator is active for AM demodulation, for single sideband and CW operation, a BFO can be activated. There existed a mechanical remote control machine to control the EK 07 over telephone lines, control pulses did activate small motors which moved the frontpanel controls.

In practical use, the Rohde & Schwarz EK 07 is a strong competitor to other high end shortwave receivers from the sixties, it has a similar performance as the Collins R-390A, at least as fas as Am and CW reseption is concerned. Like with the Collins R-390, You need the optional single sideband demodulator for perfect single sideband demodulation, otherwise SSB performance is only fair when done with the internal BFO. But one has to remember, in most other receivers from that era, a BFO for SSB reception was all, the set did offer – Rohde & Schwarz did offer more, for another sum of money. So You could get, what money could buy in those years.
The receiver is quite resistant to overload and free of unwanted signals thanks to the automatic preselection; it has a very high stability and a very good dial accuracy with a dial resolution of better then 1 kHz.
Like with other commercial receivers from the fifties and sixties, the receiver is not equipped with the features to reject interfering signals such as a passband tuning or notch filter.