Good to see it working Scott!
If you remember these two numbers you can get in the ball park on db gain or
loss easily:
2x the power = 3 db.
10x the power = 10 db.
You have 20 watts in so 10 times that (10 db) = 200 watts. 2 times 200 watts
(3 db) = 400 watts for 13 db total. You have a little more than 400 watts
out so you have a little over 13 db of gain.
To get it exact do the math like Jeff showed.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of KB0NLY
> Sent: Thursday, March 05, 2009 3:40 PM
> To: amps@contesting.com
> Subject: [Amps] An Extra Thank You!
>
> 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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