in the past Italy had many important firms in the radio electronic field and some of them was involved in the production of equipments for maritime radio communications, of of the them was I.R.M.E. factory based in Rome. I.R.M.E. produced a wide range of marine radios and between them there was one receiver, very similar to the ATALANTA of Marconi Marine, the model RXU 70. This receiver has been used for long time and not only on Italian flagged ships, unfortunately on the web there is not much to report here, it was a receiver of good quality but with some drift trouble. If someone reading this post has some documents for picking up the main features of this radio, they are very welcome.
Marine Receiver – JRC NRD 91
JRC firm has been established in 1915, the company produced a wide variety of products including marine electronics, measuring equipments for telecommunication, radio broadcasting equipments, and amateur radio equipments. For marine radiocommunications JRC produced a wide range of apparaturs both for ships and coast radio stations, from high perfomance receivers to high power trasmitters and today continue to have a leadership in the production of GMDSS equipments.
In this review it is showed the NRD 91 receiver which is the basic model followed by NRD 92 and NRD 93, today this equipments, not longer used in maritime communications, found a place in several amateur radio and SWL/BCL stations.
Here a clip with receiver tuned on the frequency of the Italian coast radio station NAPLES RADIO c/s IQH while trasmitting NW.
Power Supply AC 100/110; 200/ 220 and DC battery 24 Volt
Audio output 1 W on 600 ohm
Materials Metal rack
Dimensions (LxHxD) 480 x 149 x 294 mm / 18.9 x 5.9 x 11.6 inch
Notes Wave range: 90 kHz – 29.9999 MHz
Double superhet with up-conversion using a PLL synthesizer.
Reception modes: CW, MCW, DSB, SSB (FSK, FAX optional)
Selectivity: 6 kHz, 3 kHz, 0,5 kHz
Digital frequency display
Head phone jack.
Optional desktop cabinet (dimensions 489 x 190 x 305 mm, weight 11.5 kg).
Net weight 7 kg / 15 lb 6.7 oz (15.419 lb)
Marine Receiver – Marconi Marine Oceanic
By Radio Officer Riccardo MEMEO (The Netherlands)
this is a receiver produced both by Elektromekano later Danks Radio (with name M3000) and by Marconi Marine (with name “Oceanic”) I have used this radio on board bulk carrier M/V Massimiliano c/s ICZV a great receiver indeed.
On the photo below M/V Massimiliano (FERRUZZI Fleet)
In the clip below a restoring of the M3000
Coverage: 100 – 30000 kHz
Selectivity: 5.4/2.4/1/.2 kHz -6dB
Stability: ± 1 PPM 0° to 40° C
Sensitivity: <2 µV 4-30 MHz 20 dB
IF Rejection: >90 dB
Image Rej.: >90 dB
Antenna Input: BNC 50 ohm (>4 MHz)
Audio Out: 4 W 4 ohm
Environment: 0° to +50° C
Preset freq.: 500/2182 kHz
Dimensions: 509x159x463 mm weight 15 kg
Voltages: 110/220 VAC 50/60 Hz 60W or 24 VDC 85W
73’s R/O Riccardo MEMEO
Marine Receiver – Elektromekano M97
Review by Radio Officer Riccardo MEMEO (The Netherlands)
an excellent Rx that I had the pleasure to use on board two ships: it is the Elektromekano M97 that can be seen on the photo of the entire RT station that I include. It was like the Siemens 745 E310 with the bandspread every 100 kHz. However, it had the advantage over the latter that the bandwidth was selectable according to the type of modulation chosen. On A1 could be selected the 300 Hz filter in case of strong qrm.
Range : 14 kHz to 26 MHz in 10 bands, 14-21.5 kHz; 96-230 kHz; 240-530 kHz; 600-1500 kHz; 1.5-3.8 MHz; 3.7-7.4 MHz; 7-11 MHz; 11-15 MHz; 15-19 MHz and 19-26 MHz.
Modes : AM/CW/MCW/SSB
Selectivity : 8.2/4/2/0.6 kHz -3 dB
Sensitivity : < 3 to 5µV 20 dB S/N (7-26 MHz)
IF Rej. : > 90 dB typical
IF : 1300-1200, 560 kHz
Image Rejection : > 65 dB
Audio out : 3.23 Ohm 1.5 W
AGC : Off/Short/Long
18 Tubes used : 2 EF85; 7 EBF80; 4 ECH81; 1 ECF 80; 1 EAA91; 1 EL95 and 2 OB2.
Calibration for bandspread every 100 kHz. (same as the Siemens E 310)
The M97 is supplied with 9 built-in crystals, plus sockets for additional 10 crystals, covering the complete marine coastal frequencies in the 4, 6, 8, 12, 16 and 22 MHz for extra frequency stability.
Dimensions : Cabinet version 564x408x434 mm 44 Kg, 22.2x16x17” 97 Lbs
R/O Riccardo MEMEO
Marine Receiver – Eddystone 1830/1
By Radio Officer Sandro VIALE – Italy
on this review it is showed the prestigious receiver 1830/1 made by Eddystone in the 70s. On many ships this receiver was dedicated as “Emergency Unit”. First time I have used this radio I was on board M/V “Jolly Marrone” c/s IBIM, below the picture of the vessel and a short clip I recovered by an old VHS cassette where the receiver is on the right side of the rack (bottom unit). After the clip are listed some features of this equipment.
Power supply AC 100-130 / 200-260 / Battery12 Volt
Audio power 1.5 W
Material Metal rack
Dimension (LxHxD) 502 x 164 x 376 mm / 19.8 x 6.5 x 14.8 inch
Notes General coverage receiver, covering 120 kHz – 31 MHz in 9 bands (120-250 / 240-480 / 480-950 / 920-1750 kHz, 1,5-2,9 / 2,9-5,5 / 5,5-10 / 10-19 / 18-31 MHz); AM, CW, USB/LSB.
10 crystal controlled preset channels. Optional plint loudspeaker unit 989 or cabinet speaker 935, optional anti-vibration mounting LP-2817/2. Standard production version, approved by MPT as Marine Reserve Receiver.
Also sold as S.A.I.T. MR1431 and under Hagenuk Label.
Weight 18.1 kg / 39 lb 13.9 oz (39.868 lb)
Frequency Coverage and Tuning Facilities
In the 1830/1 and 1830/2 models, a total of 9 ranges cover 120kHz to 31MHz thus:
Range Coverage Conversion IF1 IF2
1. 18 to 31 MHz Double Tunable 1300-1400 kHz 100 kHz
2. 10 to 19 MHz Double Tunable 1300-1400 kHz 100 kHz
3. 5.5 to 10 MHz Double Tunable 1300-1400 kHz 100 kHz
4. 2.9 to 5 MHz Double Tunable 1300-1400 kHz 100 kHz
5. 1.5 to 2.9 MHz Double Tunable 1300-1400 kHz 100 kHz
6. 920 to 1750 kHz Single 100 kHz
7. 480 to 950 kHz Single 100 kHz
8. 240 to 480 kHz Single 100 kHz
9. 120 to 250 kHz Single 100 kHz
The 1830/3 and 1830/4 models cover similar frequencies on ranges 1 through 6 and 9, but cover the following on ranges 7 and 8, leaving a gap in the tuning range between 535kHz and 920kHz, ie. the lower half of the medium-wave or ‘Broadcast Band’:
Range Coverage Conversion IF1 IF2
7. 400 to 535kHz Single 100kHz
8. 200 to 400kHz Single 100kHz
R/O Sandro VIALE
Marine Receiver – Eddystone 1837
on this review some details about the marine receiver produed by Eddystone at the end of the 70s, no videos available on the web.
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
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
all scan functions
filter bandwidth = 0,15/0,4/0,75/3,1/6 kHz
weight 25 Kg
Marine Receiver – Redifon R551N
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.
After published this short review I received by Radio Officer Richard PHILLIPS the following message:
the Redifon R551N that you have on your site is not a commercial
radio but one used by the British Royal Navy (and possibly other NATO
forces too). You can tell this by the model number ending in N, the
NATO spares number (5820-99-525-6189) and the fact that it is painted
The standard commercial radio is the Redifon R551. It is painted cream
and black and does not have the ARU18 or ARU11 units.
I've attached a picture of a ship with a Redifon radio room that I
Marine Receiver – Rohde & Schwarz EK 07
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.
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.
Marine Receiver – Skanti R5001
under request of Radio Officer Sandro VIALE (Italy) and thanks to details supplied by him below a short review of one of the most popular marine receiver the Skanti R5001, this receiver has been produced also under Sailor and Debeg:
This is a marine receiver covering 0.01-30 MHz. It receives AM, USBl LSB (BFO), CW, and RTTY, and is a very good performer, especially using AM and on medium- and long-wave.
The R5001 marine and general purpose receiver is designed for use in a marine main radio station. The receiver has synthesized operation in the frequency range 10 kHz to 29,999.9 kHz.
The receiver is designed for reception of type F1, A1, A2, A2H, A3, A3H, and upper-sideband A3A, and A3J signals. It is fully transistorized, and widespread use is made of integrated circuits. These features, in connection with the fact that no crystal ovens are used, cause the receiver to be ready for operation immediately after having been switched on.
Depending on the power pack installed in it, the receiver can be powered from a 24 V battery, or from AC voltages normally occurring in practice.
The dimensions match a 19-inch standard rack.
Synthesized operation from 10 kHz to 29.9999 MHz
Fully digital read-out.
Modes of operation
A1, A2, A2H, A3, A3H, A3J, and F1. Simplex, semi-duplex and duplex with built-in duplex filters
-6 dB -60 dB
Wide +/- 4 kHz +/- 17.5 kHz
Intermediate +/- 1.2 kHz +/- 1.9 kHz
Narrow +/- 0.5 kHz +/- 3.5 kHz
Very narrow +/- 0.1 kHz +/- 2 kHz
SSB +350 and +2700 Hz -400 and +3400 Hz
F1 +/- 400 Hz +/- 850 Hz
Connection made for high input impedance. Sensitivity max input for 10 dB SINAD.
Frequency Mode Sensitivity
0.1-1.6 MHz A1 4 uV
0.1-1.6 MHz A2, A2H, A3 18 uV
1.6-4.0 MHz A1, A3A, A3J, F1 1 uV
1.6-4.0 MHz A2, A2H, A3, A3H 4 uV
Connection made for low input impedance, 50 ohm. Sensitivity max input for 10 dB SINAD.
Frequency Mode Sensitivity
0.1-1.6 MHz A1 2 uV
0.1-1.6 MHz A2, A2H, A3 9 uV
1.6-4.0 MHz A1, A3A, A3J, F1 0.5 uV
1.6-4.0 MHz A2, A2H, A3, A3H 2.5 uV
4-30 MHz A1, A3A, A3J, F1 0.5 uV
4-30 MHz A2, A2H, A3, A3H 2.5 uV
10 mW to phones (400 ohm)
5 W to loudspeaker (4 ohm)
10 dBm to line (600 ohm)
24 V battery with P5010 power pack
110/115/120 or 220/230/240 V single – or two phase AC 50-60 Hz with P5011 power pack
24 V battery, and/or 110/115/120 or 220/230/240 V single – or two phase AC 50-60 Hz with P5012 power pack
Supply voltage variations
DC: -10 to +30 %
AC: +10 %
24 V battery approx. 2 A
AC mains approx. 45 VA