RC818

Freuenzbereich
FM: 87,5 - 108 MHz;
LW: 150 - 519 kHz;
MW: 520 - 1710 kHz;
KW: 1,711 - 29,999 MHz in 13 Kurzwellenbereiche verteilt. BFO. Tastatur zur direkten Frequenzeingabe, 45 Senderspeicher. Uhr mit div. Schalt- und Weckfunktionen. Buchse für 3,5 mm Stereo-Kopfhörer; Buchse für externe Stromversorgung 6 V DC; Buchse für externe AM-Antenne; integriertes Kassettenlaufwerk mit Aufnahmesystem AC Bias.

Variante des Sangean ATS-818CS

Wavebands
LW: 150 - 519 kHz
MW: 520 - 1620 / 1710 kHz
SW: 1.621 / 1.711 - 29.999 MHz divided into 13 shortwave ranges. BFO for CW or SSB.
FM:87.5 - 108 MHz, 10.7 MHz IF.

AM Wide 6 kHz, AM Narrow 4.5 kHz (6 dB BW, nominal)

Autoscan on AM and FM

FM Stereo on headphone socket, built in 76 kHz PLL MPX decoder and stereo indicator.
Tuning indicator.
Keyboard for direct frequency input with 45 station memories.
Clock with various switching and alarm functions.
AM is dual conversion, may be 49.995MHz  and 455 kHz, or 55.845 MHz and 450 kHz.

Connections
3.5 mm stereo headphones
External 6 V DC (nominal)
AM aerial and earth.

The integrated cassette drive has AC bias for recording and is stereo recording on FM and stereo playback on the earphone socket, 40dB channel separation.

Minimum reliable operation is about 4V, +/- 0.2V.

Rebadged European Sangean ATS-818CS

Other comments from the model

• The SW band has a second set of nine memories by using 0 as a prefix.
• The Standby mode is cancelled by holding C and Standby.
• The erase appears to be a magnet, which reduces the dynamic range of recordings to about half.
• Contrary to the sevice manual you need to remove the main PCB and the cassette deck to adjust the speed, using an external 4.5V to 5V PSU to simulate the typical battery level.
• The BFO on/off is separate to memory, so if using BFO on the Amateur bands and you select any MW, SW, LW memory you get a whistle till you turn off the BFO!
• If Standby can't be cancelled: Remove one or more main cells and one AA cpu cell. Count to 20 after the time has completely faded. This resets the CPU.
• The S meter displays the battery status for a few seconds after power off.
• The 1720/1721 split rather than 1620 / 1621 split for MW (Broadcast) and SW may only be USA models.
• The Manual mentions a Stereo indicator: There isn't any obvious indication, though the AM Wide / Narrow bandwitch switch enables and disables the stereo decoder.
• On SW Autoscan, if a predefined band is found, it will loop within that band. It's not possible to Autoscan the entire SW band.
• The main PCB is marked ATS-818.
• The internal microphone picks up the transport mechanism, so it's intended for dictation.
• The large internal beeper sounds on entering or exiting a predefined SW band.
• You need to remove the volume knob, but not the tuning knob to remove the  PCB.  Two PCB screws are machine threads rather than "self tapping" for plastic.
• The outer of the coax plug for the external 6V DC PSU is positive, unlike most newer PCBs. A 5V PSU is fine. A SMPSU should be avoided as they can create LW / MW / SW interference.

Here you find 100 models, 96 with images and 44 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Roberts Radio Co.Ltd., East Molesey, Surrey, UK