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PostPosted: Sun Jul 10, 2016 8:26 pm 
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Joined: Thu Jun 30, 2016 8:38 am
Posts: 2
I have seen a number of post regarding the supply voltage but would like to know how much power out is possible as battery voltage drops from 13 down to 11V or maybe less. Would it be simply the ratio of the voltage drop squared ( from 50W at 13V to around 35W at 11V) ?

Can the expected drop in output power be somewhat compensated by higher drive and if so how much before there is degradation of the transmitted signal quality? Has anyone measured this?

I will run from gel cells and am wondering if I should use a boost converter to ensure a clean signal.

many thanks for any input,

Colin.. W1DJR


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PostPosted: Sun Jul 10, 2016 9:18 pm 
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Joined: Mon Jul 23, 2012 6:25 am
Posts: 1143
Hi Colin,

I put my HR50 on the test bench and made the following measurements:

Freq: 7.2 MHz, Drive: 3W

Voltage: Power Output:
13.8V 62W
13.5V 60W
13.0V 57W
12.5V 54W
12.0V 50W
11.5V 48W
11.0V 44W
10.5V 40W

I can't see the need for a voltage booster when running on batteries, < 2 dB difference in output power from 13.8 to 10.5V

73,
Jim WA2EUJ


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PostPosted: Mon Jul 11, 2016 7:05 am 
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Joined: Thu Jun 30, 2016 8:38 am
Posts: 2
Thanks Jim,

Excellent, I now have my fall construction project :-) (right after I finish repairing my spectrum analyzer)

73,

Colin..


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