The DD-101 Digital Dial is available for Hammarlund, Hallicrafters, and National receivers.  The receiver model number and frequency are both displayed on the LCD.  There is also a band for any receiver, reguardless of manufacrurer, that uses 455KHz IFs.  A TCXO is used for the reference frequency which makes the dial highly accurate and stable.  The  dial can be calibrated to compensate for receiver IF misalignment or crystals that have aged.  Operation is automatic on most receivers.  There is one switch located on the rear panel.  Some single conversion receivers switch the local oscillator from high side injection to low side on some bands, which requires the use of the switch.  Installation is possible without soldering.  Included are a Tube Shield Interface and power supply.

Hammarlund Models Supported HQ-100, HQ-105, HQ-110, HQ-120, HQ-129-X, HQ-140, HQ-145, HQ-150, HQ-160, HQ-170, HQ-180, HQ-200, SP-110, SP-200/210, SP-400, and SP-600.


Hallicrafters Models Supported   S-20R, S-22R, S-38, S-40, S-41, S-47, S-51, S-52, S-53A, S-76, S-85, S-107, S-108, S-119, S-129, S-200, S-210, SX-25, SX-28, SX-42, SX-43, SX-62, SX-71, SX-96, SX-99, SX-100, SX-101, SX-110, SX-111, SX-122, SX-130, SX-133, SX-140, SX-146.


National Models Supported   NC-33, NC-44, NC-55, NC-46, NC-57, NC-60, NC-77, NC-80, NC-81, NC-88, NC-98, NC-100, NC-105, NC-109, NC-121, NC,-125, NC-140, NC-155, NC-156, NC-173, NC-183, NC-183D, NC-188, NC-190, NC-200, NC-240, NC-270, NC-300, NC-303, NC-400, HRO-7, HRO-50, HRO60.