Current consumption for various HF rigs

In working out some additional battery power for portable operation I wanted to know the current consumption of some of the HF radios that I own. While I have a KX2 I didn’t include it as I’m not all that concerned about power consumption as it sips electrons.

Sometimes more than 10W may be necessary so taking a 100W radio for some portable operations is a nice option. I measured the current consumption in 5W increments for the following radios:

Yaesu FT-857D
Kenwood TS-590SG
Icom IC-7100
Kenwood TS-480SAT

While I would never use the TS-590SG for portable operation I included it just for comparison. The results are in the table below (current in Amps):

857

590

7100

480

Power (W)
5 3.77 6.43 5.66 5.08
10 4.93 7.47 6.77 6.34
15 5.42 8.23 7.46 7.08
20 6.02 9.02 8.07 7.88
25 6.62 9.77 8.67 8.67
30 7.18 10.09 9.35 9.22
35 7.76 10.51 9.93 9.85
40 8.34 11.18 10.53 10.40
45 8.90 11.81 11.19 11.02
50 9.47 12.50 11.80 11.64
55 9.75 12.90 12.21 12.13
60 10.08 13.23 12.58 12.63
65 10.49 13.61 12.94 13.12
70 10.82 13.94 13.40 13.62
75 11.17 14.30 13.79 14.03
80 11.58 14.67 14.16 14.26
85 11.93 14.99 14.53 14.36
90 12.27 15.32 14.92 14.37
95 12.70 15.59 15.31 14.45
100 13.07 15.75 15.72 14.49
Receive 0.68 1.39 0.65 1.00

Current consumption vs. Power level

The measurements were made using a Samlex SEC-1223 power supply and a Powerwerx Inline Power Meter.

Powerwerx meter

Measurements were made in CW mode on 20m into a Drake DL1000 dummy load.

Drake DL1000

Current consumption was a bit higher on lower frequency bands. For instance, on 40m most of the measurements were anywhere from 300-500mA higher.

 

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