[Amps] PA efficiency

[Ron Youvan]

> On 18 May 2011 13:20, Carey Lockhart, KC5GTT<kc5gtt at gmail.com>  wrote:
>> I was afraid of that. 58.3%. my gs31 2 meter amplifier i use for a standby
>> isn't much more efficient than my gs-35 that just croaked. i have been using
>> these yu1aw designs. have yet to get the rated operating parameters listed. i
>> don't even have a clue where to start. i am wondering if there is a more
>> proven design better suited to my skill level. any suggestions?

>> Carey, kc5gtt

> It's totally pointless stating the efficiency to 3 significant figures
> (58.3%). Whilst if you use a DVM you can read DC voltages and currents
> to well under 1%, you wont be able to measure the RF power to anything
> like that accuracy. So your efficiency is probably somewhere between
> 48% and 68%. So worrying about the odd 1 percent is totally pointless
> unless you use professional, laboratory quality test equipment to
> measure the RF power.

> In fact, I doubt your high voltage probe is sufficiently to measure
> the voltage to better than 1%.

> Dave

   I measure the Voltage with my Tektronix 475B.  That's why I bought it.
-- 
    Ron  KA4INM - "Ubuntu" -- an African word, meaning "Slackware is too
                   hard for me".