WTB: AM FILTER

[Gerald C. Lemay]

A bulk order from Jan Crystals makes more sense to me than buying an AM filter for
probably a hundred bucks. But there are those among us who either don't have the time,
inclination, tools, or ability to build and test a filter, so that has to weighed.
Myself, I wouldn't mind building one. Years ago, I designed, breadboarded, and tested a
bunch of filters for the old Measurements division of McGraw-Edison. It was a lot of work
but it was fun and one of the more notable events of my so-called career in Electronics.
As it stands now, I do have a 5 KHz filter in my SB-303 but I'd like to have one in the
SB-300 as well. In fact, I tried that filter out the the 300 and it worked really well. I
would even be tempted to build one as a breadboard and put it inside the rig.

mike bryce wrote:

> you know Ed, it would not be at all much of a problem to do a PC board for
> the filter. In fact, LMB makes small metal cases that would hold the works
> together. about the same size as a heath filter, they are used to pot
> electronics. I am sure a filter would fit inside one.
>
>  I have never took a filter apart, so other that crystals and a few caps, I
> don't know what's inside.
>
> If i could get a schematic, I could whip out a pc board artwork in a few
> hours.
>
> a bulk order from JAN crystals might cheapen up the price a bit on the
> rocks.
>
> --
> Mike Bryce WB8VGE
> SunLight Energy Systems
> "Electricity at the speed of light"
>
> > From: Eddy Swynar <gswynar at DURHAM.NET>
> > Reply-To: Eddy Swynar <gswynar at DURHAM.NET>
> > Date: Tue, 22 Aug 2000 06:48:24 -0400
> > To: HEATH at LISTSERV.TEMPE.GOV
> > Subject: Re: WTB: AM FILTER
> >
> > Hi Gerald...
> >
> > I was the fellow who built the SB-310 AM filter "clone"...
> >
> > You're correct: it was NOT cheap, as such---besides the price of 4 custom
> > cut crystals, you also incur the expense of a "regular" Heath SSB filter,
> > which is used as the foundation for your new AM jobbie.
> >
> > Still, considering the rarity of the '310 filter (and the price, should be
> > be lucky enough to find one!), the effort is certainly worth it. I would say
> > that the cost of construction, as compared to some of the prices seen on
> > eBay, make it an even draw...
> >
> > Oh yes, there IS one added benefit: you're actually doing some
> > honest-to-goodness, time honoured, Ham inspired HOMEBREWING by rolling your
> > own, & to me that's almost priceless!
> >
> > ~73~ Eddy VE3CUI - VE3XZ
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Gerald C. Lemay" <wa1vwl at GROLEN.COM>
> > To: <HEATH at LISTSERV.TEMPE.GOV>
> > Sent: Monday, August 21, 2000 6:24 PM
> > Subject: Re: WTB: AM FILTER
> >
> >
> >> That won't work. It's already been tried by several people. Bandwidth will
> > likely be 50
> >> to 100 KHz wide. This is what happens when you have a high IF frequency
> > such as 3.395
> >> MHz. It's all a matter of frequency versus percent bandwidth. There was a
> > thread a while
> >> back about building a crystal filter with 4 crystals the builder obtained
> > from Jan
> >> Crystals. It wasn't cheap but then, neither is a 5 KHz filter if and when
> > you find one .
> >>
> >> Ed Richards wrote:
> >>
> >>> If you want it that wide, try it without any filter. Just put a small
> >>> capacitor across the switch contacts.
> >>> Regards,
> >>> Ed Richards
> >>>
> >>> On Sun, 20 Aug 2000 22:08:11 -0700 Peter Havens
> >>> <pjhavens at CYBERTRAILS.COM> writes:
> >>>> Ya'll can laugh if you like, BUT I really am looking for a 3.75 kc
> >>>> filter
> >>>> for the '301/303, etc. Actually, I would prefer the 5.0 kc unit, but
> >>>> who
> >>>> wouldn't....
> >>>>
> >>>> Peter Havens
> >>>> KA2SQJ
> >>>>
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