[ARC5] BC-455 IFT - selectivity solutions...

[D C _Mac_ Macdonald]

Just a guess here, Ken, but I doubt that 2830 is a crystal frequency still being used for Marine radio; at least not as a fundamental transmit frequency.  As far as I know, ALL HF or MF marine radio is now SSB only.
  
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 

> From: kgordon2006 at frontier.com
> To: ac2eu at yahoo.com
> Date: Thu, 30 Oct 2014 21:46:56 +0000
> CC: ARC5 at mailman.qth.net
> Subject: Re: [ARC5] BC-455 IFT - selectivity solutions...
> 
> On 29 Oct 2014 at 18:47, J Mcvey wrote:
> 
> > So, to raise the Q, improving the L6-C12 combo with something better ( 
> > higher Q components?) would be the way to do it. Otherwise, it's back to 
> > "regen".
> 
> Actually, for a hacked-up piece-of-junque like those I am saddled with, 
> Mike Murphy's WU2D, crystal-filter really appeals to me. Trouble is, 
> finding 2830 KHz rocks... 
> 
> I checked with International Crystal Manufacturing and they need around 
> $30 each for a one-off. I haven't contacted JAN yet, though.
> 
> Since 2830 KHz is actually some sort of marine radio frequency, there 
> really ought to be a cheaper source...
> 
> In addition, there are several problems with the regenerative IF, amongst 
> which is that as the signals you are working with get stronger, its 
> effectiveness gets weaker, which is the opposite of what you really want.
>  
> > Does that make sense?
> 
> Yes. I've always liked "Q-Multipliers". I have several, but none on 2830 
> Khz....yet.
> 
> vy 73,
> 
> Ken W7EKB