[Amps] An Extra Thank You!

[KB0NLY]

Ok, so would that be..

450 / (2380 * .375) = 0.504

Roughly 50%??

Scott



----- Original Message ----- 
From: <n8de at thepoint.net>
To: <amps at hidden-valley.com>
Cc: <amps at contesting.com>
Sent: Thursday, March 05, 2009 3:05 PM
Subject: Re: [Amps] An Extra Thank You!


Efficiency % =

power output divided by (Plate volts times Plate current)

The quantity in parentheses is the power into the amplifier final circuit.

Good luck
Don
N8DE


Quoting Jeff Carter <amps at hidden-valley.com>:

> Congratulations!  It's such a rush to work on something like that and
> see it work when you're done.
>
> To answer your questions, I have to say it's been a while, and I'm
> sure AMPS will jump in and correct me if I'm wrong, but here's how I
> *think* I remember that this is done.
>
> For gain in dB, I think it's 10*log(power out/power in).  So in your
> case, it's 10*log(450/20), or 10* log(22.5)= 13.5218251811 db.
>
> For efficiency, it's basically how much of the power is used and how
> much is turned into heat, and I can't for the life of me remember how
> that's calculated.
>
> I bet Dan knows...and he's much better with the math than I am.
>
> Jeff/KD4RBG
>
> ---- Original message ----
>> Date: Thu, 5 Mar 2009 14:39:35 -0600
>> From: "KB0NLY" <kb0nly at mchsi.com>
>> Subject: [Amps] An Extra Thank You!
>> To: <amps at contesting.com>
>>
>> Just wanted to post an extra Thank You to the reflector for all
>> those that have been patient with me and helping.  My 6M amp
>> project has been completed!  It was powered up and brought to life
>> today finally after much careful planning and building.
>>
>> Initial tests prove it's working rather well!
>>
>> Input 20w
>> Output 450w
>> Plate 375mA
>> Grid 80mA
>>
>> I was told to keep the GI7B at or below 400mA on the Plate and
>> 150mA on the Grid, i can do that easily.  It will make a bit more
>> power but it's maxing out my wattmeter now!
>>
>> I do have one final question for everyone here.  Knowing these
>> numbers, input, output, plate and grid, how does one calculate the
>> amp's gain and or efficiency?  I was trying to make sense of the
>> info in the handbook but it was slightly over my head with all
>> their calculations.  I'm looking for an Elmer answer on this one!
>>
>> Thanks and 73!
>>
>> Scott KBØNLY
>>
>> PS:  I will finish updating my website this afternoon with pictures
>>  of the completed amp.
>>
>> www.kb0nly.net
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>



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