[SixClub] MY NEW AMPLIFIER

[K8RI on Six]

On 2/13/2012 9:39 AM, Mike Andrews wrote:
> Burning the ends off the elements is only a start when you
> go QRO. You might start hearing voices, too, as some of my
> acquaintances have:<http://mikea.ath.cx/VOICE-OF-GOD.html>  and
> <http://mikea.ath.cx/moth-arc.html>  tell about this problem. I grant
> that these were in the SWBC band, which is HF, and up above HF is where
> things get even tricksier.

I take it you've seen "Down Periscope" too?

>
> Or you could just use it to heat your water for tea or coffee, taking
> due care to keep things from getting too dry or too sparky:
> <http://mikea.ath.cx/coffee-maker.html>.
I have 4 of those NOS 4CX300s *with NEW sockets*  They're a tiny little 
thing with lots of gain.  I'd guess he was probably running over 300 
watts of dissipation each so it's no wonder the water got hot. <:-))  
The 4CX300s?  They look pretty much like a 4CX 1000 that has been washed 
and shrunk although the finned portion is disproportionately large, 
making them look more like a metal toad stool. That long, skinny, white 
ceramic base adds to the effect. However I was thinking along the lines 
of diathermy which runs around 30 MHz. Use *big* open wire line, solder 
a couple of metal plates on the line and sit between the plates.

*CAUTION* now days they say diathermy isn't good for you and they have 
these RF exposure limits. If you think your wife has dinner ready you've 
been sitting there too long.

BTW this has some good side effects too.  To meet the exposure limits 
you will likely have to put up a taller tower...much taller and you'll 
need a much larger lot.
For instance with a pair of long boom yagis on 2-meters at 130 feet in 
the center of one square acre the maximum I could run based on the 
distance to the neighbors was only a few hundred watts.  You get that 
quadature array on six fed with a YC156 or pair of 4CX3000's and you'll 
have to fence off the back 40 for the 200 foot tower. Don't forget to 
make them loop feed antennas (LFAs) to prevent erosion caused by those 
electrons skidding off the ends of the elements.  Let's see... A pair of 
4CX3000s is technically capable of roughtly 13 KW into a 20 db array 
gives us 1.3 Mw ERP.  Any one have the RF exposure calculator? I haven't 
reloaded it since this computer crashed last fall.

Late at night, at least on 2-meters you just tune for maximum brilliance 
in your neighbors fluorescent lights. If the direction indicator gives 
out on your rotator you just look to see which direction the glow runs. 
Also if you have one of those neighbors who claims to be allergic to 
cell phone radiation, you can tell them this will over ride it and 
prevent it from bothering and not to worry about those strange burns. It 
must have been caused by the sun shining that one day last week. (I live 
in Michigan)

I'd also suggest that if your coffee doesn't get cold while setting on 
the desk, it might be time to examine your grounding and shielding systems.


73

Roger (K8RI)