[Hammarlund] HQ-129X Dial Windows?

[Richard Knoppow]

----- Original Message ----- 
From: "lee" <pulsarxp at embarqmail.com>
To: "Roger Shultz" <nj2r at verizon.net>; 
<hammarlund at mailman.qth.net>
Sent: Sunday, December 04, 2011 6:55 PM
Subject: Re: [Hammarlund] HQ-129X Dial Windows?


>I would bet the yellow ones got that way from UV lighting 
>where the clear
> ones did not get much UV exposure.
>
> Lee, w0vt
>
>
> I'm working on the restoration of two units, one which has 
> a set of clear
> plastic windows and the other which has a yellow set which 
> is cloudy where
> the bezel borders met it.
>
> Did different units have clear or yellow? Is yellow 
> correct?
>
> I've polished the yellow set and it seems like a uniform 
> yellow throughout
> however I am unable to polish out the cloudy area so far 
> using Novus 2.
>
> Last question, does anyone have a nice condition set of 
> clear or yellow
> windows from a parts unit they would sell?
>
> 73, Roger, NJ2R
>
    They should be clear. The yellowing is from some 
chemical effect, probably lee is correct that UV exposure is 
part of it. I have a RX where the yellow is across part of 
one window, evidently exposed to sunlight for a long period 
at some point. I know of no way to remove the yellow, I 
think the stain runs the depth of the plastic. OTOH, you can 
probably find sheet plastic of the right sort to make new 
ones.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com