[Amps] Screen current problem solved!

[Carl]

Its those little things that bite you on the a**.

Been there done that and is why I bought a 3000 W CCS RCA load, built by 
Bird, with a tapered snout and rated to 1000 mc at a hamfest almost 30 years 
ago.
It included a seperate 5" wattmeter in a cabinet, and a set of  250 and 
1500W slugs for the 400-1200mc range, total of 4 elements. It works fine at 
1296 with barely a tickle of VSWR and is still useable at 2304.

All for $125 since others passed on it as they werent intelligent enough to 
realize it works fine at VHF and below also (-;  This was even before no 
coders and make believe Extras !!

The resistor is still within 2% of 50 Ohms and based upon the mc ratings it 
has to built before the pointy heads forced that EU crap on us. I do turn on 
a pair of larger size muffin fans when pushing or exceeding the 3KW.

Carl
KM1H


----- Original Message ----- 
From: "Vic K2VCO" <k2vco.vic at gmail.com>
To: "Amps reflector" <amps at contesting.com>
Sent: Saturday, November 09, 2013 11:19 AM
Subject: [Amps] Screen current problem solved!


>
>   Yesterday I reported that the screen current of my 4CX1000A was dropping
>   when  the  key was down for more than 10 seconds or so. Several of you
>   suggested that some component in the tank circuit or screen supply was
>   heating up.
>   Well, I found it. The dummy load! Sometimes you don't see the nose in 
> front
>   of your face. I have a dummy load which is a Drake '1000-watt' unit that 
> I
>   added several muffin fans to. I guess the fans weren't cooling it fast
>   enough -- the actual resistor element is rated at 500 watts -- so it was
>   heating up, changing in value, and therefore changing the loading.
> -- 
> Vic, K2VCO
> Fresno CA
> [1]http://www.qsl.net/k2vco/
>
> References
>
>   1. http://www.qsl.net/k2vco/
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