DSC04493

Marine Receiver – Allocchio Bacchini AC20

Dear Sparks,

in Italy there have been some industries produced marine radio gears during the “Radio Golden Age”, one of them was a big factory located in North Italy with name RADIALBA or well known as ALLOCCHIO BACCHINI very famous for the production of domestic radios and first TV sets. This time it is proposed the Marine Receiver model AC 20, these radios have been used on board for more than 20 years from their date of built, very nice audio quality also if the receiver suffered of a certain drift never solved definetively because of its own project: Rotating Drum with tuned tanks, anyway the AC 20 has been very popular among Italian Radio Officers. Unfortunately on the web there are not videos about this receiver. Below the characteristics:

AC20 – Allocchio Bacchini

Paese: Italia

Producer:   Allocchio Bacchini (Radialba); Milano

Anno:  1956

Categoria: Professional receiver

Valvole: 13: 6CB6 6CB6 6BE6 6C4 6BE6 6BA6 6BA6 6BA6 6AL5 6BA6 12AU7 6AQ5 0A2

Principle:  supereterodyne double / triple conversion; ZF/IF 950/62 kHz; 2 Stage AF

Tuned tanks:  9 Circuits

Power supply:  AC voltage 110 or 220 Volts

Speaker: output for external speakers or headphones

Audio power:  2 W (excellent quality)

Model: AC20 – Allocchio Bacchini Radialba

Materials: metal cabinet

Dimension (LxHxD):   490 x 300 x 405 mm / 19.3 x 11.8 x 15.9 inch

Frequency coverage:  75 kHz – 31 MHz

Weight:   25 kg / 55 lb 1.1 oz (55.066 lb)

73’s

webmaster

3010_1

Marine Receiver – MACKAY 3010 C

Dear Sparks,

to remember the MACKAY receiver model 3010 C installed on many anglosaxon ships..

Country: USA

Producer: Mackay Radio & Telegraph Company; New York

Alternative name: ITT Mackay Marine

Year: 1968

Category: Professional receiver

Tubes  17: 7788 6C4 6688 6BL8 6BE6 6BA6 6BA6 6AV6 12AT7 6BF5 6BL8 6U8 6EW6 6BA6 6BA6 6AU6 0B2

Principle: Supereterodyne double / triple conversion; ZF/IF 455 kHz

Bands: MF HF

Power supply:  AC / 115 Volt

Model: 3010-C – Mackay Radio & Telegraph

Materials: Metal cabinet

Dimension (LxHxD): 19 x 10.5 x 16 inch / 483 x 267 x 406 mm

Notes: Coverage (10 kHz)70 kHz to 30 MHz in 15 bands, works in AM, CW, MCW, SSB and FSK, S-meter, BFO, triple conversion ~38 MHz, 5,94 MHz and 455 kHz, 90 inch film scale, differences to the type B are just added capacitors to improve the frequency stability.

73’s

webmaster

566_01

Marine Receiver – Siemens 745 E 310 or Debeg 566

picture by http://www.seefunknetz.de

Dear Sparks,

waiting for MRD this time is proposed the good German receiver Siemens 745 E 310 or Debeg 566, the receiver was used also in other brands of radiocommunications but largely on merchant ships.

General Coverage Communications Receiver
Double Conversion Superheterodyne
17 Tubes + Semiconductors
Made in West Germany 1956 – 1971

 

Specifications
Coverage: 14 – 21 / 85 – 175 / 170 – 350 / 340 – 730 / 720 – 1540 kHz
1.5 – 3.1 / 3.1 – 6.3 / 6.0 – 10.2 / 9.7 – 15.2 / 14.7 – 20.2 / 19.7 – 25.2 / 24.7 – 30.2 MHz
Modes: AM/CW/MCW
Antenna Input: SO-239 75 Ohms unbalanced
Sensitivity: CW: 0.3 µV 6 dB S/N, AM: 8 µV (LF-MF), 4 µV (HF) 10 dB S/N
Setting & Read out: 500 Hz
Selectivity: 6.2/2.4/1.8 kHz –6 dB. In the 14 – 21 kHz and 85 – 175 kHz ranges 0.8 kHz –6 dB.
Formfactor -6/-60 dB: 1:2.8 at 6.2 kHz bandwidth.
IF: 1st IF: 1080-1180 kHz, 2nd IF: 100 kHz
IF Rejection: 50-70 dB, typically 70 dB
Image Rejection: 40-80 dB
Audio Output: 1.6 W/5000Ohms, 600 Ohms line
Voltages: 110/125/220/250 V AC +/-10% 40-60 Hz, 100 W
Physical: Cabinet Version: 550x350x380 mm, 35kg
  Rack Version: 520x304x380mm
Accessories: FSE 2 or Teletron TG 440 for FSK, FSE 7 or Hellfax BS 110 for Fax

 

Features
– Headphone Jack – Speaker – Speaker Switch – Line Out 600 Ohms
– BFO +/-3 kHz – ANL – AGC/MGC – AGC 0.1/1sec.
– RF Gain – Calibrator 100 kHz – Dial Lamp – Two Tuning Speeds
– Fine Tuning – Break In Relay – Semi Modular – Rack Handles

 

Circuit Complement
Tubes + Semiconductors: 4x EF 93 (=6 BA 6), 3x EK 90 (=6 BE 6), 4x ECC 82 (=12 AU 7), 2x EAA 91 (=6 AL 5), 1x EL 90 (=6 AQ 5), 1x EM 34 (=6 CD 7), 1x 108 C 1 (=0B 2), 1x 150 C 2 (=0A 2), selenium rectifiers in power supply.
Tuning: Three ganged capacitors in RF circuits, three ganged capacitors in 1st variable IF-circuits. Continuos tuning by a knob (transmission 10:1 pushed and 160:1 pulled) via 1st oscillator. Alternatively above 1.5 MHz exact setting of 1st oscillator in steps of 100 kHz with calibrator for RF conversion to variable 1st IF (1180 to 1080 kHz), fine tuning via 2nd oscillator (1280 to 1180 kHz) for further conversion to 2nd IF (100 kHz).
Crystal: 1x 100 kHz for calibration.
Dials: Very big colorful coarse dial, first segment is fine tuning dial 100 kHz.

 

Comments
This model was designed for the marine market replacing the E 61, E 66a (LF, HF, 1948), E 303, E 305 and E 306 (all HF, 1952-1954). The E 310 was licensed as a class one receiver by Deutsche Bundespost. A standard receiver like competitor Hagenuk UE 12 on German ships. The twelve bands are selected by push-buttons on the left. Called “parrot cage” by the operators, referring to its colorful dial. Quite suitable for SSB reception using the product detector at 1.8 kHz bandwidth in CW mode.

 

Variants
The E 310b has a C-type antenna jack instead of the SO-239 jack. The E 566 is a very similar model, first with a dark green cabinet and front panel, later often light gray.

Best regards,

webmaster

Receptor_marconi_Atalanta_1

Marine Receiver – Marconi ATALANTA

picture by LU5FBX

Dear Sparks,

waiting for the Maritime Radio Day we will propose a revival of marine receivers many of us used during the Radio Golden Age. The receiver proposed this time is the MARCONI ATALANTA largerly used on Merchant ships but it has been reported it was employed in the Navy to.

Country of production:  Gran Bretagna (Regno Unito)

Factory:  MIM, Marconi International Marine; Chelmsford Essex

Year: 1958

Tubes:  14

Type of receiver:  Supereterodyne  double / triple conversion

Power supply:  220/24 Volt (and battery)

Audio power:  1 W

Name of RX:  Model: Atalanta 2207C – MIM, Marconi International

Materials: Metal cabinet

Dimension (LxHxD):  495 x 319 x 503 mm / 19.5 x 12.6 x 19.8 inch

Description: Complete coverage is provided by the receiver over the frequency band 15 kc/s. to 28 Mc/s. in ten ranges, with band spread scales directly calibrated in frequency for the six H.F. marine bands. Additionally, electrical fine tuning of 3 kc/s. Provides signal tuning discrimination of great accuracy. The wide frequency range available and the complete coverage of the receiver makes it suitable for mobile, maritime or fixed stations having to receive signals from a wide range of transmitting sources.
The receiver, which is normalcy mounted in a bench-type cabinet may, to meet special requirements, be fitted on a standard 19-inch rack. The “Atalanta” operates directly from 110 or 220 volts D.C., or 115 or 230 volts A.C. in conjunction with the necessary power units.
The receiver covers the band 15 kc/s. to 20 Mc/s. in ten ranges as follows:
1. 15-25 kc/s. (20,000 – 12,000 m.)
2. 25 – 100 kc/s. (12,000 – 3,000 m.)
3. 100-200 kc/s. (3,000 – 1,500 m.)
4. 200 – 400 kc/s. (1,500 – 750 m.)
5. 400-800 kc/s. (750-375 m.)
6. 800 kc/s. – 1.4 kc/s. (375 – 176.4 m.)
7. 1.7- 3.6 Mc/s. (176.4 – 83 m.)
8. 3.6 -7.5 Mc/s. (83 – 40 m.)
9. 7.5 – 15 Mc/s. (40 – 20 m.)
10. 15 – 28.0 Mc/s. (20 -10.7 m.)
Intermediate Frequency: On ranges 1, 3, 4, and 5 I.F. of 85 kc/s
On range 2 and ranges 6 to 10 a I.F. of 700 kc/s and a 2nd I.F. of 85 kc/s.

Weight: 35.4 kg / 77 lb 15.6 oz (77.974 lb)

Best regards,

webmaster