[HBR] modifying the 262kHz K-Tran IFs to 100kHz

[Ron Barlow]

Hi Eddy,
 That may work ok, depending on circuit layout, IF freq., stage gain, etc., but I have encountered oscillation problems, when installing caps, in that position, as the grid ckt. can "see" the plate circuit, via thje caps. A small shield may reduce the feedback, sufficiently. IIRC, I didn't have space for such a shield, so I don't know if it would have helped, in my situation.
 In my case, I was replacing the built in caps, that were defective, with external units, as there was insufficient space, inside the 3/4 inch square "miniature" cans, for the mica caps that I was using.
        73 de Ron n4gjv
 

--- On Mon, 3/16/09, Edward Swynar <gswynar at durham.net> wrote:

> From: Edward Swynar <gswynar at durham.net>
> Subject: Re: [HBR] modifying the 262kHz K-Tran IFs to 100kHz
> To: "HBR Receiver List" <hbr at mailman.qth.net>
> Date: Monday, March 16, 2009, 9:37 AM
> Hi All,
> 
> Would it not make sense to have mounted these capacitors
> OUTSIDE of the IF
> can, directly to the appropriate terminals and in parallel
> with each
> winding, that way...?
> 
> ~73~ Eddy VE3CUI - VE3XZ
> 
> 
> *******************************************
> 
> ----- Original Message -----
> From: "Tim Shoppa" <tshoppa at wmata.com>
> To: <HBR at mailman.qth.net>
> Sent: Monday, March 16, 2009 8:18 AM
> Subject: Re: [HBR] modifying the 262kHz K-Tran IFs to
> 100kHz
> 
> 
> > KC9KEP writes:
> >
> > > While I was trying to slide
> > > the coil, I suddenly realized that the plastic
> coil form
> > > was starting
> > > to bubble up for the heat & was turning to
> mush!
> >
> > The heat from the heat gun will heat up the
> lowest-density
> > lowest-heat-capacity materials first... and this means
> the
> > coil form unfortunately.
> >
> > For a lot of purposes working with wax, the double
> > boiler in the kitchen comes in handy.
> >
> > But... with these god-dang polystyrene coil forms, the
> coil form
> > may begin to turn gooey below the melting point of
> water.
> >
> > I hate polystyrene coil forms (all so popular from the
> HBR era)
> > with a vengeance. Melted way too many of them when I
> was
> > a kid.
> >
> > Tim.
> >
> >
> >
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