[Elecraft] re:k1 SSB filter modification

Mon Mar 24 16:16:12 2003

Ok Karl,
also i have a 40 and 20 m option. My K1 rig is working very well but i am
not a purist Cw operator.
I like SSB also so i am studing same mod to K1 as:
- band extension (about 350 Khz )
- SSB transmission on K1.
The real problem is to insert these new features without any mecanical mods
to the K1. Also the electrical mods must be little so the initial status can
be restored easy.
I have a web site  http://it.geocities.com/giulianoi0cg
see the K1 page but, this mod. isn't  on the web now.
I have built the filter only 2 days ago so my documentation isn'ready.

The input filter is connected to the pin 3 of Noise blanck connector and the
output to C38.
The switching is performed when the Xfil Dc voltage overcome 4 V . So the
switching from CW and SSB is performed automatically when filter 1 (at 850
Hz) has selected .
The filter has made with six cristal at 4915 KHz (cost about one $ each)
I hope to insert the filter schematics on my web this week.
Thanks for your interest.
Giuliano I0CG

----- Original Message -----
From: "W8TIF - Karl" <[email protected]>
To: <[email protected]>
Sent: Monday, March 24, 2003 2:32 PM
Subject: Re: [Elecraft] k1 SSB filter modification

> Giuliano,
> I just acquired an Elecraft K-1 (set up for 40M and 20M so far), and I
would
> certainly like to consider adding your SSB filter "adaptor" to my K-1 for
> ocassionally listening to SSB when I'm traveling.
>
> You can send me info via e-mail attachments if you'd like, or a longer
> verbal description of what you did.
>
> Thanks for your help and the opportunity to make this little rig even MORE
> versatile than it already is!
>
> Warmest regards,
>
> Karl Kanalz - W8TIF
> McKinney, Texas
> [email protected]
>
> ----- Original Message -----
> From: <[email protected]>
> To: "elecraft" <[email protected]>
> Sent: Monday, March 24, 2003 7:20 AM
> Subject: [Elecraft] k1 SSB filter modification
>
>
> I have built an SSB filter (k2 ssb opt. like).... it is working fine on my
> K1 #1423.
> This filter is fitted on a little board inserted into Noise blanker
> connector.
> To switch the filter, i  use the XFIL/Tone voltage and a voltage
comparator.
> When i select, on the front panel, the Filter 1, the SSB filter is
switched
> on.
> If anyone is interested i send more details.
> 73 to all K1 gang
>  Giuliano I0CG