DC-7D

The Mizuho DC-7D is an early to mid '70s 40 meter monoband CW transceiver featuring a direct conversion reeiver. The radio is VFO controlled, covering 7.000-7.150 MHz. It is powered by a single 9V battery which fits inside the rig, or it can also run on 9-12V external DC. Mizuho reflector members report hum in the receiver audio when using early DC series rigs (DC-7D and DC-701), so operation on battery power is generally advised. The rig was quite spartan, but it did include RIT and an innovative single lever paddle built right onto the front of the radio. The DC-7D was sold both in kit form and factory wired and tested. The radio was not sold in North America and is extremely rare outside of Japan, and somewhat rare in Japan, expecially in good condition.

Specifications:

General:
Frequency Coverage:
7.000-7.150MHz
Frequency Control: VFO
RIT: ±2.5kHz
Antenna: 50 Ohms unbalanced, SO-239 connector
Power requirements: 9.5-12VDC
Power consumption: 45mA at Receive (no signal); 550mA max. at Transmit
Size: 170mm(D) x 202mm(W) x 67mm(H)
Weight: 1.7kg

Transmitter:
Operating mode: A1 (CW)
Maximum Output Power: 1W

Receiver:
Sensitivity: Less than 15µV for 10dB S/N
Selectivity: ±600Hz for 15dB
Audio output: 0.5W

DC-7D Schematic Diagram (PDF format).

-Last updated 7/7/2003