NR-4or6SCB Description

NR-4/6SCB SSB/CW Monoband Transceiver

NR-4SCB
NR-6SCB

The NR-4SCB is a simple to use 15 Watt 4 Meter Monoband SSB/CW transceiver. It covers from 69.900 Mhz to 70.400 MHz and operates USB and CW. The NR-4SCB uses a single conversion design with an IF frequency of 10.7 MHz. Front end bandpass filters limit out of band signals into the RF Preamp stage. A double balanced diode ring mixer provides good strong signal handling capability. There are two 8 pole crystal filters following the mixer which are designed for 2.8 kHz and 500 Hz -6dB bandwidths. The 2.8 kHz filter allows for good SSB voice fidelity while the 500 Hz filter provides good adjacent channel rejection on CW. Either filter can be selected in both modes. Two IF amplifier stages and fast attack AGC provide good receiver sensitivity while leveling the audio output on strong signals. AGC action starts at approximately a -120 dBm input signal level. The local oscillator is derived from a DDS/PLL circuit providing a high degree of stability and low noise. A high stability 107.374 MHz reference oscillator is used for all local oscillator generation. The high reference frequency provides low DDS spurious output.

Other features of the NR-4SCB series include RIT (Receiver Incremental Tuning) and SPLIT mode functions as well as a built in Iambic Keyer for CW. The AGC rate has a FAST and SLOW speed to suit operator preference.

The version B firmware allows CAT control of the radio through the Interface connector on the back panel. Frequency and mode can be set or read from a rig control program such as a logger. The command set follows that of the Yaesu FT-857. An interface needs to be provided to convert the RS-232 output at the Interface connector to a USB compatible format to interface to most new PC's. The Noble Radio ACAT-1 is a device that can be added to accomplish this as well as provide a sound card with a USB connection to allow easy digital mode operation of the radio. There is a fixed level (not controlled by the receiver volume control) receiver audio output on one pin of the Mic connector. The ACAT-1 also provides a front panel switch to allow a digital mode setup or normal Microphone input for SSB operation without having to switch cables on the radio's Mic connector.
The IF output connector on the back panel of the radio brings out a buffered wideband 10.7 MHz signal which can be used as the input to a panadapter. A panadapter combined with the CAT control interface will allow “point and click” frequency tuning of the radio off the spectral display of the panadapter. Noble Radio's NR-PAN64 Panadapter can be used for this purpose. It can provide a very wide band view so multiple modes of activity can be viewed at the same time.

The NR-4SCB is a special order item. Contact the factory for delivery times

The NR-6SCB is a simple to use 15 Watt 6 Meter Monoband SSB/CW transceiver. It covers from 50.000 Mhz to 50.500 MHz and operates USB and CW. The NR-6SCB uses a single conversion design with an IF frequency of 10.7 MHz. Front end bandpass filters limit out of band signals into the RF Preamp stage. A double balanced diode ring mixer provides good strong signal handling capability. There are two 8 pole crystal filters following the mixer which are designed for 2.8 kHz and 500 Hz -6dB bandwidths. The 2.8 kHz filter allows for good SSB voice fidelity while the 500 Hz filter provides good adjacent channel rejection on CW. Either filter can be selected in both modes. Two IF amplifier stages and fast attack AGC provide good receiver sensitivity while leveling the audio output on strong signals. AGC action starts at approximately a -120 dBm input signal level. The local oscillator is derived from a DDS/PLL circuit providing a high degree of stability and low noise. A high stability 107.374 MHz reference oscillator is used for all local oscillator generation. The high reference frequency provides low DDS spurious output.

Other features of the NR-6SCB series include RIT (Receiver Incremental Tuning) and SPLIT mode functions as well as a built in Iambic Keyer for CW. The AGC rate has a FAST and SLOW speed to suit operator preference.

The version B firmware allows CAT control of the radio through the Interface connector on the back panel. Frequency and mode can be set or read from a rig control program such as a logger. The command set follows that of the Yaesu FT-857. An interface needs to be provided to convert the RS-232 output at the Interface connector to a USB compatible format to interface to most new PC's. The Noble Radio ACAT-1 is a device that can be added to accomplish this as well as provide a sound card with a USB connection to allow easy digital mode operation of the radio. There is a fixed level (not controlled by the receiver volume control) receiver audio output on one pin of the Mic connector. The ACAT-1 also provides a front panel switch to allow a digital mode setup or normal Microphone input for SSB operation without having to switch cables on the radio's Mic connector.
The IF output connector on the back panel of the radio brings out a buffered wideband 10.7 MHz signal which can be used as the input to a panadapter. A panadapter combined with the CAT control interface will allow “point and click” frequency tuning of the radio off the spectral display of the panadapter. Noble Radio's NR-PAN64 Panadapter can be used for this purpose. It can provide a very wide band view so multiple modes of activity can be viewed at the same time.

The NR-6SCB is a special order item. Contact the factory for delivery times

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