[Heathkit] CW Filter for the SB-104A

[Jeramy Thibodeaux]

Fred,

A quick re-read of your post.  I want to add that all can be done with out
actually having the manual.  The component values are silk screened right on
the circuit board.  Pay attention to k5bcq's notes on his website.  If for
some reason you cannot determine the component values let me know an I will
check against my board.

Good Luck and Hope this helps!

Jeramy
kg4azt

----- Original Message ----- 
From: "Jeramy Thibodeaux" <kg4azt at earthlink.net>
To: "Frederick W. Holmes" <w1sku at direcway.com>; <Heathkit at mailman.qth.net>
Sent: Sunday, July 25, 2004 5:31 AM
Subject: Re: [Heathkit] CW Filter for the SB-104A


> Fred,
>
> You can go to this site and see the section on the "E" Board (Carrier
> Generator) for the values needed.
> http://www.qsl.net/k5bcq/sb104/sb104.html
>
> It is also helpful if you have the SB-104A schematic and or assembly
manual
> handy (Pages 1-91 thru 1-103).  This section covers the said Carrier
> Generator/Xtal Filter Circuit board.
>
> Don't forget to remove the two jumpers and install Diodes D678 and D681 in
> there place.
>
> If your board is like mine!  Every spot for a component will be filled
when
> both filters are installed (except for one).  Looking at the component
side
> of the board with the filters toward the left, there is one spot for a
3900
> ohm resistor located just below L605.  L605 is located between the left
edge
> of the board and the left most filter (SSB) about 3/4 up from the bottom
of
> the board.  There is no mention of this part in the manual.  Close
> inspection of the circuit board leads me to believe that this part was
never
> installed.  I am guessing that it was a change implemented at Heathkit
> between the 104 and 104A models.
>
> Good Luck and Hope this helps!
>
> Jeramy
> kg4azt
>
> ----- Original Message ----- 
> From: "Frederick W. Holmes" <w1sku at direcway.com>
> To: <Heathkit at mailman.qth.net>
> Sent: Sunday, July 25, 2004 10:00 AM
> Subject: [Heathkit] CW Filter for the SB-104A
>
>
> > Hello to All,
> >
> > Does anyone have the installation instructions for installing a CW
filter
> in
> > the SB-104A ? I am going to install one that I have, but I need to know
> the
> > values of the inductors that they use to try and come up with them. I
will
> > gladly pay copying and shipping on the instructions, or a scanned image
of
> > the manual sent by email would be great also.
> >
> > Thanks for reading this posting.
> >
> > 73 de Fred, W1SKU
> >
> > w1sku at direcway.com
> >
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>
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> $$ See the vintage area on the HCI web site - http://www.w9wze.org $$
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