DDS-2A Local Generator Unit
![[DDS-2A]](dds2a1.jpg)
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The DDS-2A is a micro-processor controlled external VFO for the Collins KWM-2(A) and S-Line, including 75S-3B and 32S-3. The DDS-2A uses the latest DDS and PLL technology to produce accurate and clean local signals for the equipment. The unit utilizes an original BFO of 435.65 kHz (456.35 kHz) in the Collins equipment.
The DDS-2A replaces PTO and HFO in the equipment. You can expect 10 Hz frequency resolution and accuracy in the transmit and the receive.
Because of the clean local injection, you can expect performance improvement, including inter-modulation and cross-modulation characteristic.
The DDS-2A provides an HFO (Heterodyne Frequency Oscillator) signal in the range of 6.550 MHz to 32.950 MHz (5 kHz off the original range) in 200 kHz increments.
The signal replaces the HFO oscillator of the equipment thereby general coverage is possible. You can operate your equipment in a new WARC bands, as well as to receive short-wave broadcast stations.
The HFO output is produced by the low-noise PLL with reference frequency of 50 kHz.
The DDS-2A provides VFO signal of 2.695 MHz to 2.495 MHz (5 kHz off the original range) that will replace the PTO of the equipment. The VFO output can be adjusted in 10 Hz increment.
The VFO uses an NCO (Numeric Controlled Oscillator) within a PLL loop that provides excellent C/N and accuracy over the range.
Total of 100 memory channels are provided for instant access to the important frequencies. A=B and split operation are also included for the VFO function.
The DDS-2A provides BFO shift compensation to obtain accurate frequency display. A 455 kHz of the reference frequency can be compensated up to 9.999 kHz in 1 Hz steps for both the USB and the LSB. (Example; 1.350 kHz of the Collins original frequency)
Standard RS-232C port is provided for remote control through the PC's COM port.
The DDS-2A can be installed to the KWM-2(A) without any modifications to the equipment. It can also be installed to the S-Line (75S- / 32S- ) with the modification to the 75S-( ) receiver. The DDS-2A uses a inch-size optical encoder for the VFO dial, so you can replace the knob to an original Collins spinner knob.
The DDS-2A is a micro-processor controlled external VFO for the Collins KWM-2(A) and S-Line, including 75S-3B and 32S-3. The DDS-2A uses the latest DDS and PLL technology to produce accurate and clean local signals for the equipment. The unit utilizes an original BFO of 435.65 kHz (456.35 kHz) in the Collins equipment.
The DDS-2A replaces PTO and HFO in the equipment. You can expect 10 Hz frequency resolution and accuracy in the transmit and the receive.
Because of the clean local injection, you can expect performance improvement, including inter-modulation and cross-modulation characteristic.
The DDS-2A provides an HFO (Heterodyne Frequency Oscillator) signal in the range of 6.550 MHz to 32.950 MHz (5 kHz off the original range) in 200 kHz increments.
The signal replaces the HFO oscillator of the equipment thereby general coverage is possible. You can operate your equipment in a new WARC bands, as well as to receive short-wave broadcast stations.
The HFO output is produced by the low-noise PLL with reference frequency of 50 kHz.
The DDS-2A provides VFO signal of 2.695 MHz to 2.495 MHz (5 kHz off the original range) that will replace the PTO of the equipment. The VFO output can be adjusted in 10 Hz increment.
The VFO uses an NCO (Numeric Controlled Oscillator) within a PLL loop that provides excellent C/N and accuracy over the range.
Total of 100 memory channels are provided for instant access to the important frequencies. A=B and split operation are also included for the VFO function.
The DDS-2A provides BFO shift compensation to obtain accurate frequency display. A 455 kHz of the reference frequency can be compensated up to 9.999 kHz in 1 Hz steps for both the USB and the LSB. (Example; 1.350 kHz of the Collins original frequency)
Standard RS-232C port is provided for remote control through the PC's COM port.
The DDS-2A can be installed to the KWM-2(A) without any modifications to the equipment. It can also be installed to the S-Line (75S- / 32S- ) with the modification to the 75S-( ) receiver. The DDS-2A uses a inch-size optical encoder for the VFO dial, so you can replace the knob to an original Collins spinner knob.
![[DDS-2A with KWM-2]](dds2a2.jpg)
DDS-2A Product Review
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This Home Page was created by wa3key, Monday, October 14, 1996
Most recent revision Monday, October 14, 1996