[BVARC] AC watts to power HF transmit and receive

[Salvador Garza]

Most radios will state the max current draw at 13.8Vdc. For example my Yaesu 991A's max current draw is 23A @ 13.8Vdc. Factor in about 70% AC power supply efficiency (your power supply’s specs will state efficiency).  P = (23 * 13.8)/0.7 = ~454W @ max power consumption on AC. Use this number plus a safety factor to calculate for capacity. The Kill-a-Watt will give you a more accurate picture of average power consumption based on your specific usage (SSB, CW, Digi,etc).

Just out of curiosity, what are you planning on cooking with this number?

Best,
Sal
AI5FL

> On Dec 12, 2021, at 1:12 PM, Mike Lambert via BVARC <bvarc at bvarc.org> wrote:
> 
> Yes, I would like to know how many watts an HF radio draws.
> 
> Mike
> 
> On 12/11/2021 4:01 PM, Christopher Boone wrote:
>> You mean a KWH meter like the power companies use??
>> 
>> On Sat, Dec 11, 2021, 3:58 PM Mike Lambert via BVARC <bvarc at bvarc.org <mailto:bvarc at bvarc.org>> wrote:
>> Could someone use a Kill-A-Watt meter to measure the AC power required 
>> for their HF rig to receive and transmit?
>> 
>> Thanks,
>> Mike  KI5MIK
>> 
>> 
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