[TenTec] Better Bulb Life in TenTec 229, 238 Tuners

[Jim Brown K9YC]

On Fri, 15 Feb 2008 13:56:03 -0600, Dr. Gerald N. Johnson wrote:

>The big problem today with LEDs is that the light is very focused while
>the light from an incandescent lamp would be nearly uniform over the
>whole sphere if it wasn't for the lamp base. 

Yes. That's what makes them difficult to use in applications like the 
Ten Tec tuners. The white tape that I've added on the vertical panels to 
reflect the light helps a lot. 

>I'd never want a diode of any flavor inside an antenna tuner if I
>could avoid it.

Your fears are not well founded. While there might be a small amount of 
noise on the lamp circuit, that circuit is not coupled to the RF 
circuitry (except to the extent that TenTec is frightfully careless 
about running their wiring around the enclosure). 

73,

Jim K9YC