R-7A Pic.

R-7A receiver

Previous Home Up Next

R7Anb.jpg (26585 octets)
Click to enlarge
Picture :  JM CHERRY

Last Update : zondag 12 november 2006 23:16:00
Comments: Similar to the R-7, but with the 500 Hz filter and NB-7A Noise Blanker

100% solid state broadband design, fully synthesized  with a permeability tuned oscillator (PTO) for smooth, continuous tuning.

Covers the complete range 0 to 30 MHz with no gaps in frequency coverage Both digital and analog frequency readout

Special front-end circuitry, employing a high level double balanced mixer and 48 MHz "up-converted" 1st i-f for superior general coverage, image rejection and strong signal handling performance.

Complete front-end bandpass filters are included that operate from hf thru VLF. External VLF pre-selectors are not required.

10 dB pushbutton-controlled broadband preamp can be activated on all ranges above 1.5 MHz. Low noise design.

Various optional selectivity filters for cw, RTTY and a-m are switch-selected from the front panel. SSB filter standard.

Special new low distortion "synchro-phase" a-m detector provides superior International short wave broadcast reception This new technique permits 3 kHz a-m sideband response with the use of a 4 kHz filter for better Interference rejection.

Tunable if notch filter effectively reduces heterodyne interference from nearby stations.

The famous Drake full electronic passband tuning system is employed, permitting the passband position to be adjusted for any selectivity filter. This is a great aid in interference rejection.

Optional accessories available
Model 1531 Drake MS-7 Speaker

Three AGC time constants plus ‘Off" are switch-selected from the front panel.

Complete transceiver / separate functions when used with the Drake TR-7/TR-7A transceiver are included, along with separate R-7A R.I.T. control.

Special multi-function antenna selector/50 ohm splitter is switch-selected from the front panel, and provides simultaneous dual receive with the TR-7. This makes possible the reception of two different frequencies at the same time Main and alternate antennas and vhf/uhf converters may also be selected with this switching network.

The built-in power supply operates from 100,120,200, 240 V-ac. 50/60 Hz, or nominal 13.8 V-dc.

R-7A Standard Selectivity:

The digital readout of the R-7 may be used as a 150 MHz counter, and is switched from the front panel.
Access thru rear panel connector

The R-7A includes a built-in speaker, or an external Drake MS-7 speaker may be used.

Built-in 25 kHz calibrator for calibration of analog dial.

Low level audio output for tape recorder.

Up to eight crystal controlled fixed channels can be selected (With Drake Aux-7 installed )

NB-7A Noise Blanker, SUPPLIED  AS STANDARD, provides true impulse type noise blanking performance.

 

R7rear.JPG (14391 octets)
Source : R.L. DRAKE - DRAKE R-7A
R7 IFBoard.JPG (4392 octets)

RF7 IF Selectivity Board Filter Location
0,3 kHz - 0,5 kHz - 1,8 kHz - 4 or 6 kHz
R-7A Standard Selectivity: 2.3 kHz SSB, 500 Hz CW and 9 kHz AM
Optional filters:
Crystal filters

Previous Home Up Next

(c) 1998-2012 D. PRODUCTS SA/NV - DRAKE is a registered trade mark of R.L. DRAVE COMPANY
No copy of text or image without a written authorization : email: JM CHERRY
Last updated on: 24 Dec 2011