DIAMOND RH 40 / RH 15 / RH 06 QRP Antennas

diamondrh

Daiichi Kogyo Kogyo Co., Ltd. DIAMOND brand of base coil antennas for portable transceivers .I They have models for the 40/15/6 m band respectively. These are popular bands for japanes hams. In fact the market for these antennas has always been the japanese domestic market.

Rod element

5 stage expansion and contraction

  • Elongation: 59.5 cm
  • Reduction: 13.0 cm
  • Diameter: 6 mm
  • Screw diameter: 3 mm
  • Thread hole depth: 17 mm
  • Weight: 19 g

Base coil

  • RH 40: Length 20 cm Weight 39 g
  • RH 15: Length 12 cm Weight 29 g
  • RH 06: Length 10 cm Weight 26 g

 

coil Impedance
50 Ω Frequency
SWR minimum value
/ SWR lowest frequency
Band
RH 40 7.138 MHz
(60 Ω is the best value)
1.05 / 7.138 MHz 7.11 to 7.16 MHz (SWR ≦ 1.5)
7.09 to 7.18 MHz (SWR ≦ 2.0)
RH 15 21.103 MHz 1.35 / 21.335 MHz 21.18 to 21.49 MHz (SWR ≦ 1.5)
20.98 to 21.77 MHz (SWR ≦ 2.0)
RH 06 48.130 MHz
(58 Ω is the best value)
1.1 / 52.855 MHz 51.92 to 54.18 MHz (SWR ≦ 1.5)
50.69 to 55.09 MHz (SWR ≦ 2.0)

SWR was measured with a Rig Expert AA-100 antenna analyzer directly connected with M – BNC .

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