Information

Racal RA17 Specification & Performance

Racal RA17 Specification & Performance


The performance specification of the Racal RA17 was very impressive for its time. The low level of drift was paricularly impressive, but so too were the other RA17 specification parameters.

Brief Racal RA17 Specification
ParameterRA17 Specification Details
Frequency range980kc/s - - 30 Mc/s (down to 500kc/s with degraded performance).
Frequency stabilityTypically within 50 c/s after 1 hour warm up
Input impedance75Ω unbalanced
TuningEffective scale length 145 feet (44.2m), 1.5 cm = 10 kc/s
CalibrationCrystal controlled in 100kc/s increments. Stability 5 parts in 106.
Sensitivity and S/N ratio1µV for 18dB S/N (AM)
3µV for 18dB S/N (MCW)
Intermodulation>100dB down for interfering signal >10kc/s off tune.
Cross modulationFor a wanted signal between 3µV and 1mV, an interfering signal 10kc/s off tune and modulated at 30% must have a level >50dB (>30dB) above the wanted signal to produce cross modulation of 3% (1%). The ratio of wanted to unwanted signal is improved up to 10% off tune by 3%.
BlockingWith similar conditions to those for cross modulation, an unwanted signal must be 60dB greater before the audio output of the wanted signal is reduced by 3dB from blocking.
Local oscillator technologyWadley Loop
ConversionsTriple conversion superhet
Reception modesAM & CW - SSB adaptor became available
Antenna input impedance75Ω
Output impedance3Ω and 600Ω
Gain controlsRF & AF
AGCLong and short
DimensionsWidth: 19 in (48.3 cm)
Height: 10 ½ in (26.7 cm)
Overall depth: 20 ⅛ in (51 cm)
Depth behind panel: 18 ¾ in (47.6 cm)
Weight67lb (30.5kg)


Watch the video: Prova ricevitore Geloso G4-216 by I8KLL Luciano il professore (September 2021).