[ARC5] Selectivity improvement in BC-639

[D C _Mac_ Macdonald]

That was supposed to have been AMECO nuvistor pre-amp.
 
Mac, K2GKK/5
 
 
 
> From: k2gkk at hotmail.com
> To: kgordon2006 at frontier.com; arc5 at mailman.qth.net
> Date: Mon, 2 Jun 2014 11:22:46 -0500
> Subject: Re: [ARC5] Selectivity improvement in BC-639
> 
> I used a BC-639 and modified SCR-522 transmitter on 2m AM from 1962 through 1966.  An AM pre-amp made the 639 quite usable.  I still have the 522 in rack in the garage but sold the 639 about 3 or 4 years ago. They were reasonably stable considering the bandwidth.  FAA used the 639s in fixed applications into the 60s IIRC. They were often paired with the BC-640 xmtrs with split-site installations.
>  
> * * * * * * * * * * * 
> * 73 - Mac, K2GKK/5 * 
> * (Since 30 Nov 53) * 
> * k2gkk hotmail com * 
> * Oklahoma City, OK * 
> * USAF & FAA (Ret.) * 
> * * * * * * * * * * *