DRAKE TR7

A front panel switch allows the operator to Select an optional crystal filter independent of the MODE switch. A wide range of optional crystal filter band-widths are available, and installation of an accessory filter can be accomplished in minutes. The standard bandwidth is 2.3 kHz, and it is automatically selected in transmit to insure proper signal characteristics. A passive double balanced mixer is employed in the receiver front end. This stage is preceded by a low noise, high dynamic range bipolar rf amplifier to provide good strong signal performance and weak signal sensitivity.

The digital frequency readout of the TR-7 is derived from a true frequency counter to assure an accurate display of operating frequency. In addition, the tuning knob dial skirt is calibrated in 1 kHz increments to facilitate short frequency excursions.

The transmitter of the TR-7 features a rugged, solid-state power amplifier section which has been de-signed for continuous duty in the SSB and CW modes. For more demanding duty cycles, such as SSTV or RTTY, the Model FA-7 cooling fan is available. The transmitter section also features very low harmonic and spurious output, and is equipped with automatic high VSWR protection.

The VOX GAIN and DELAY controls are conveniently located on the front panel, and full break-in CW operation is obtained via a switch on the VOX DELAY control. VOX operation can be disabled by a front panel switch.

Other features include selectable AGC time constants, receiver incremental tuning (RIT), provision for an accessory noise blanker (NB-7), and T/R switching connections for an external linear amplifier and/or receiver.

The modular construction of the TR-7 reduces service time to a minimum. Each module is designed to perform a specific function, and this feature, combined with the open, accessible layout of the transceiver greatly simplifies any required alignment and troubleshooting. Liberal use is made of table connectors, simplifying module removal.

 

GENERAL : Frequency Coverage: 1.8-2.0*, 3.5-4.0, 7.0-7.5,10.0-10.5, 14.0-14.5, 18.0- 18.5*, 21.0-21.5, 24.5- 25.0*, 28.0-28.5*, 28.5- 29.0, 29.0-29.7* MHz.(*With accessory range crystal). Modes of Operation: U SB, LSB, CW Frequency Stability: Less than 1 kHz drift first hour. Less than 150 Hz per hour drift after first hour. Less than 100 Hz change for a * 10% line voltage change. Readout Accuracy: * 10 ppm * 100 Hz Power Requirements: 13.6 VDC regulated, 2 A. 12 / 16 VDC unregulated, 0.8 V rms maximum ripple, 15 A. Dimensions: Depth: 12.5 in. (31.75 cm), excluding knobs and connectors. Width: 13.6 in. (34.6 cm). Height: 4.6 in. (11.7 cm) excluding feet. Weight: 14 lb. (6.35 kg) TRANSMIT : Power Input (Nominal): 150 Watts, PEP or CW Load Impedance: 50 ohms. Spurious and Greater than 40 dB Harmonic Output: down. Inter-modulation Greater than 30 dB Distortion: below PEP. Carrier Suppression: Greater than 50 dB. Undesired Sideband Greater than 60 dB at Suppression: 1 kHz. Duty Cycle: SSB, CW: Key Down ( w/o FA7 Fan): 100% 30%, 5 minutes maximum transmit Key down (w/FA7 Fan): 100% Microphone Input: High Impedance CW Keying: Instantaneous full break-in, adjustable delay. RECEIVE : Sensitivity: Less than 0.5 uV for 10 dB S+N/N except less than 1.0 u V 1.8-2.0 MHz. Selectivity: 2.3 kHz minimum at –6 dB. 4.1 kHz maximum at –60 dB. (1.8:1 shape factor) Ultimate Selectivity: Greater than 95 dB. AGC : Less than 5 dB output variation for 100 dB input signal change, referenced to AGC threshold. Inter modulation: (20 kHz or greater spacing) Intercept Point: Greater than 0 dBm. Two-Tone Dynamicn Range: Greater than 85 dB. IF Frequency: 5.645 MHz IF Rejection: 50 dB, minimum. Image Rejection: 60 dB, minimum below 14 MHz. 50 dB, minimum above 14 MHz. Audio Output: 2 watts, minimum @ less than 10% THD (4 ohm load). Spurious Response: Greater than 60 dB down.

ACCESSORIES for TR-7 AUX-7 Auxiliary program board, Model 1536 DR-7 Digital readout MMK-7 Model 1335 Mobile Mounting Kit MS-7 External Speaker, Model 1531 RV-7 Remote VFO for TR-7 RV-75  Synthesized Remote VFO’s. Permit rcvg, xmtg or xcvg on separate frequency in same band as xcvr PS-75 & PS-7 Power Supply, Model 1545 MN-75 & MN-7 antenna matching network, Model 1540 NB-7 Noise Blanker FA-7 Cooling fan, Model 1529 Desk Microphone, Model 7077 ( Astatic ) SP-75 Speech Processor, Model 1553 CW-75 Electronic Keyer, Model 1507 P-75 Phone Patch, Model 1520 Crystal filters

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