[MRCA] GRC-9 Bias Battery Needed

[mac]

Mark,

If you come up with an original plug-in battery it will almost  
certainly be dead.  Three cells pulled from a common 9 volt battery  
will fit neatly inside the plug-in if you can pry the plastic case  
open without destroying it (some pop open easily and some don't).   
Failing that, get a 3 x AAA holder and mount it at some convenient  
location on the receiver chassis.  For another solution see <http://www.tuberadio.com/robinson/museum/GRC-9/ 
 >  It's also been reported that a 3 volt Li camera battery will work  
OK.

The BC-1306 predecessor to the GRC-9 tapped negative voltage off the  
HF oscillator circuit to bias the audio PA.  Different oscillator  
circuit in the GRC-9 but might be possible to pull the same trick and  
thereby eliminate the battery problem forever.

Good luck,

Dennis D.  W7QHO
Glendale, CA

**************
On Feb 29, 2012, at 3:52 PM, n1jzv at midmaine.com wrote:

> Received my GRC-9 today and the plug-in style bias battery is  
> missing.  If
> you have one to spare please let me know.
>
> Thank you
> 73
> Mark
> K1HF
>
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