Note
Ham Radio, Jul 1976, p. 92. (DD-6B and C)
Operates as a digital dial reading within 100 Hz ($1/10$ kHz) of actual operating frequency on both Receive and Transmit. Also functions as a sensitive general-purpose frequency counter covering 100 Hz to 40 MHz for shack or laboratory use, with rear-panel input terminals and a selector switch.
Features
– Display: Bright 6-digit LED dot matrix display clearly visible under high ambient light.
– Digital Hold: Provides frequency memory to hold the digital display, allowing tuning to other frequencies while retaining a reference frequency.
– Sideband Capability: Includes controls (NORM / OPP switch) to provide correct frequency readings on both the normal and opposite sidebands.
– Controls: Front-panel controls include LO / HI, OFF, and DH (Digital Hold) switches.
Compatibility & Variants
– Atlas Transceivers: Compatible with all Atlas transceivers.
– Model DD-6B: Made to operate with Swan transceiver models 350D, 500D, 500CX, 700CX, 270, 270B, 300B, 600R, and 600T.
– Model DD-6C: Modified to operate with Drake R4 series receivers as well as earlier Swan models (350, 400, and 500).