[TowerTalk] Elementary Rx protection question

[K8RI]

On 1/13/2013 4:11 PM, Bruce Jungwirth wrote:
> Pete,
> I'm not sure if the diodes would degrade or not. Back in the 60's Drake used
> a small incandescent bulb across the receive ant input to absorb high
> amounts of RF. I had a TR3 & didn't notice any problems.

I believe that "neon" lamp was to bleed static electricity and voltage 
from nearby lightning strikes off to prevent damage.  Of course the 
input to those tube circuits was a very high impedance and had a high 
breakdown voltage even if the circuit was 50 ohms at the coax.

The reverse breakdown voltage of the diodes is certainly high enough as 
0.7V would be a lot of signal unless your neighbor is Jim <:-))  OTOH I 
do not know how much leakage the junction would present on the ham bands.

73,

Roger (K8RI)

>
> Bruce K0SON
>
>