[R-390] image

[Jim M.]

Both of my 390as have had that neon lamp removed by someone before I got
them.  It would be interesting to look at the lamp to see if it is glowing
from the big BCST signal down the road.

-----Original Message-----
From: rbethman [mailto:rbethman at comcast.net] 
Sent: Monday, October 22, 2007 4:58 PM
To: jmiller1706 at cfl.rr.com
Cc: Joel Richey; r-390 at mailman.qth.net
Subject: Re: [R-390] image

Folks,

DO NOT simply try and unthread THAT neon bulb!  It is soldered in - at 
least in EVERY R-390A that I've come across!!

Its purpose IS to take excess energy on the antenna to ground.  A 
perfect example is the "sand" in the Middle East.

When it blows around, the static goes sky high.  That took out the front 
ends in the Harris rigs in the First Dessert Storm.

Bob - N0DGN

jmiller1706 at cfl.rr.com wrote:
> There is an antenna overload lamp (I-103) inside the antenna relay that
illuminates in some fashion when a strong nearby signal is present...to
protect the front end presumably.  This is an NE-45 (neon type?).  If a neon
bulb is triggered by a very strong signal, what kinds of harmonic-producing
non-linearities would it inject into the front end?  Open the antenna relay
andremove the bulb (if it's there) and see what happens.
>
> More food for thought.
>
> ---- Joel Richey <richey2 at mindspring.com> wrote: 
>   
>> Hey, whats going on, 4 hours and no talk of images, I think its alien
intervention, we need to get Fox mulder from the X-files to check this out,
there more here then meets the eye.
>>
>> Joe W2DBO
>>     
>