|Racal RA. 98 Interface|
|Description||INDEPENDENT SIDEBAND ADAPTOR|
Technical Details 1 . These units are designed to enable the Racal RA . 1 7 and RA. 117 Receivers, or other suitable communication receivers having a 100 kc/s i.f. output, to be used for the reception of independent sideband and single sideband signals, with the carrier 0 to -26 dB relative to sideband power. Provision is made for the unit to be locked to an external high stability frequency source for suppressed carrier applications. It can also be used for the single sideband reception of double sideband transmissions with the advantages of reducing the effects of selective fading and, by the choice of either sideband, avoiding adjacent channel interference in most cases. 2. A very accurate crystal - controlled a.f.c. system is used to compensate for drift in the adaptor, receiver or distant transmitter; the tuning frequency is held to within ±3 c/s over a drift range of ±1 kc/s. This provides the tuning stability necessary for satisfactory and reliable independent or single sideband communication systems. 3. A carrier derived a. g. c. output (d. c.) is available from the adaptor for the purpose of controlling the receiver gain, both to counteract fading and to keep the input level to the adaptor within the optimum working range. 4. The RA. 98A and B adaptors are self-contained and are designed to operate from the 100 Kc/s i.f. output of the receiver. The only differences between the A and B models are in the types of coaxial connectors and phone jacks used and the power switch operation. • Mechanical Details 5. The adaptor is designed for rack mounting or for fitting in a suitable cabinet above the RA. 17 or RA. 117 receiver. All electrical connections with the exception of the headphones are made at the rear of the unit. 6. A dust cover is fitted which provides adequate ventilation and at the same time ensures ample protection from dust and dirt.
These manuals are available for the above equipment:
|Racal -- RA. 98 -- Service and User Manual|
|Manual Type||Service and User Manual|
|Size||2.27 Mbytes (2379050 Bytes)|
|Quality||Scanned document, all readable.|
|Upload date||25 October 2015|
|Downloads||72 since 25 October 2015|
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