[Amps] Re: 5 kw amps -- why?

[Rob Atkinson, K5UJ]

Interesting analogies.  I am in a mildly amusing situation where I'm feeling 
a little like a QRP operator who has announced the FCC should change the 
legal limit to 5 watts.  Anyway, Art, I'm the wrong one to be asking these 
questions, hi.  I drive a 17 year old Corolla clone that may do 80 mph but 
not all day, and struggles up a hill (glad I live in nice flat Illinois).  
My ham station is probably worth way more than my car (I like my sense of 
priorities).  Further, I have never understood why anyone in the U.S. would 
buy a Lamborghini, a car that can go over the speed limit here in 1st gear.  
What a waste of a wonderful automobile, which would get beat to death on a 
lot of our roads.  But anyway, time to move on--i have to put in a bid on 
WABC's MW50A
(http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=132&item=5527560239)

just kidding
73,
Rob/K5UJ




From: Arthur Moe <kb7ww at easystreet.com>
To: "Rob Atkinson, K5UJ" <k5uj at hotmail.com>
CC: amps at contesting.com
Subject: Re: [Amps] 5 kw amps -- why?
Date: Wed, 20 Oct 2004 02:10:26 +0000

It has been asked before but here again.

How fast will your car go ???
Faster than the speed limit right ???
Do you drive it at it's top speed ???
When you go up a steep hill are you glad you have the extra power so you 
don't
have to slow way down to get up it ???

If I run a 8877 with 3 Kilovolts on the anode and a anode current of .8 
Ampere
It will output ABOUT 1500 watts at all frequencies below about 60 MHZ.  If I
should want I could run it at 4 Kilovolts at 1 Ampere and get ABOUT 2500 
watts
output. Which is right at the maximum recommend anode dissipation. Or as I 
have
seen 4.5 Kv @ 1.25 A and about 3200 out on 144 MHZ for EME.  The same tube 
has
been running for over 15 years in that amp.  Not mine but a good friend.  If 
it
needed a new tube I would be the one to instal it. He is a appliance 
operator.

Now think about cars again, why are Ferrari, Lamborghini, Porsche, Corvette, 
Jaguar,
Viver, Bugatti, Cobra, Mustang, Lotus, and more. ... Fast Cars, Sports Cars. 
...
allowed ??????  Maybe because most people don't drive with their right or in 
some
cases their left foot holding the throttle pedal on the floor/firewall..



Art
KB7WW



"Rob Atkinson, K5UJ" wrote:
 >
 > After reading a review in Eham today for the Emtron DX4 (2 4cx2500s) by 
an
 > American ham, I have a question:  Is there any kind of operating at the 
1.5
 > kw pep limit that would necessitate an amp with this kind of plate
 > dissipation?  Sounded to me like an invitation to have the FCC park a van 
in
 > front of your house.
 >
 > tks
 > Rob/K5UJ

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