[Premium-Rx] lamp replacement

[Cecil Acuff]

Of course another option...the most painless option would be to contact Gary 
Wingerd and buy the Racal LED retrofit kit.  It's complete and was designed 
for the radio.  He sells them for $75.

Cecil...
----- Original Message ----- 
From: "Terry O'Laughlin" <watkins-johnson at terryo.org>
To: <premium-rx at ml.skirrow.org>
Sent: Wednesday, March 02, 2005 7:33 AM
Subject: RE: [Premium-Rx] lamp replacement


>I have two printed circuit boards left over from when I was replacing the 
>incandescent lamps in Racal 6790s.  I laid them out from the drawings in 
>the Racal manual and they mimic the original LED boards as close as 
>possible.  They are uncut rectangles and will need to be trimmed and have 
>the holes cut out where the LCDs peek through.  The LEDs are in series 
>blocks of four with dropping resistors.  I found a block of four LEDs was 
>the optimal point for the incandescent supply voltage and keeping the 
>dropping resistors small and low wattage.  There are provisions for 32 LEDs 
>in all, 8 above and below each LCD window.
>
> I'm not into Racals anymore.  The boards are available, one for $7 each 
> postpaid or $10 for the pair postpaid.  These are just the printed circuit 
> boards.  No LEDs or dropping resistors.
>
> Best,
> Terry O'
> WB9GVB
> http://watkins-johnson.terryo.org
>
>
>
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