RB7510 DDS VFO(c)

(For Use With The Drake TR-4 Transceiver)

The RB7510 DDS VFO(c) is a high stability oscillator that replaces the Drake TR-4 PTO. Other models are currently under development. The RB7510 DDS VFO(c) uses a Zilog EZ80F91 processor running at 50 MHz and an Analog Devices AD9851 DDS IC. The unit comes with a power adapter and cable for the Drake TR-4. For Frequently Asked Questions, click here. This unit also features:

Shaft encoder with 1000 steps/ revolution
Heavy solid aluminum knob for professional feel
Selectable tuning step rates of 1, 10, or 100 Hz/ step (1 kc, 10kc or 100kc/ revolution)
Temperature compensated master crystal oscillator with 2.5 PPM stability
Dual VFO implementation allows transmit and receive on different frequencies within the same band or transceive operation on either of two displayed frequencies (button selectable)
Calibration software to calibrate the digital display (Requires an accurate frequency source such as the RB5000 Calibrator)
Four line backlit LCD display shows:

Band
VFO A frequency (transmit frequency in split mode)
VFO B frequency (receive frequency in split mode)
Split or transceive mode
Transmit or receive operation
Tuning step size
Six push button switches provide:

Selection of TR-4 PT0 or DDS VFO
Use of tuning knob to change bands (4 bands/ revolution) or frequency (1000-steps/ revolution)
Selection of split (separate transmit and receive frequencies) or transceive modes of operation
Selection of VFO A or VFO B for control by tuning knob
Momentary button to transfer content of VFO A to VFO B
Momentary button to transfer content of VFO B to VFO A

Specifications

Operating temperature: 32° -120° F

Frequency stability: 2.5 PPM (+ 1 Hz at constant temperature)

Output frequency: 4.7 – 5.7 MHz

Output voltage: Approximately 1.6 Vp-p

Size: Approximately 6 5/8"w x 4 1/8"h x 6 Ľ" deep

Power consumption: 6 – 8 watts

Weight: Approximately 2 pounds

Case: Sheet aluminum .063" thick, painted black

Frequency accuracy: + 2.5PPM + accuracy of TR-4, after calibration

Power required: Supplied by plug-in power supply

Disclaimer:

The RB7510 DDS VFO(c) displays calculated TR-4 frequency to a resolution of 1 Hz. It does not actually measure the TR-4 transmit / receive frequency but calculates it based on the DDS frequency. Unfortunately we cannot add the WARC bands to the TR-4. The tuned circuits within the TR-4 do not have sufficient tuning range to allow this.

Price $475 U.S.