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Picture : Sindre TORP, LA6OP
Finalized
version of TR-4310
Matches R-4245 / R-77
Transceiver
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 | The TR-77 is a solid-state, broadband, SSB/CW transceiver
which covers all amateur bands from 10 kHz through 30 Mhz. The TR-77 offers
excellent sensitivity and selectivity, high dynamic range, digital frequency readout and
full break-in CW operation. |
| 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,
1.8 kHz, 0.5 kHz and 0.3 kHZ. The 2.3 kHz filter 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-77 is derived from a
true frequency counter to assure an accurate display of operating frequency. |
| The transmitter of the TR-77 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 FA7 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), noise blanker (NB7A), and T/R
switching connections for an external linear amplifier and/or receiver. |
| The modular construction of the TR-77 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. |
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GENERAL :
| Frequency Coverage: 10- 30000 kHz, |
| Modes of Operation: USB, 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 :
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| 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 :
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| 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 Dynamic 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
| R577 cabinet |
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