[TowerTalk] Bird dummy load?

[Ronald C. Barnes]

Its a dummy load.  Coaxial Resistor is Bird's fancy name for a dummy 
load.  Its a great big resistor soaked in oil.  Probably 50 ohms 100 watts, 
but because of the oil and fins, it can dissapate 500W.  What more do you 
need to know?

The only thing to watch for on these Bird loads is the oil gets old and 
they start to show greater than 1.0:1 SWR.  I have two as intermediate 
cavity loads on a 60KW klystron transmitter.  The curve was very spikey, 
between 1.04 to 1.07:1 SWR (this counts in TV broadcast).  And in the 5MHz 
window that is my channel (43), the SWR did have a noticable curve (1.04 - 
1.05:1)

Bird wont return phone calls from a TV station, so I think the outlook for 
a ham is even bleaker.  I found Dielectric will gladly sell oil for the 
loads, but its $45.00 / gallon!!!

Basically, use the load for any 500W class service you have.  I would NOT 
run 1000 W into it for even a few seconds.  If its close to 1.0:1 swr, dont 
fix what aint broke.


At 09:22 PM 7/24/00 -0500, you wrote:

>Good evening,
>     This isn't exactly tower related per se, but I was hoping to get a
>little information on this item.  It claims:  BIRD---- 8201 ----- TERMALINE
>COAXIAL RESISTOR. RESISTANCE ------ 50 OHM--------500 WATTS.
>
>It has an "N" connector for coaxial connector.  I have a photo if anyone
>desires to see it.  I would like any information on this, or if anyone has a
>manual, I would like to obtain a copy.
>
>Thanks in advance,
>
>Jack Markum  N5DUW
>Killeen, Texas
>
>
>
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