Hi Michael,

Thanks for the response! The problem is with strong signal overload,
combined with mediocre opposite sideband suppression. The opposite
sideband suppression is adequate for casual listening, but with an
outdoor antenna connected, the image frequency of the opposite
sideband breaks through more than I would like. The CW filter, which
just seems to add narrow audio processing to the LSB setting,
sometimes helps. I just would like to put a little more selectivity in
there- to stop some of the blow-by that is letting the opposite
sideband get through when the band is busy. For the time being, I am
going to hook up an antenna tuner to deal with some of the overload on
40 from the broadcast stations, and also a resistive attenuator to
back o ff the raw signal being presented to the front end from the
outdoor antenna.
One of these days, when I get brave enough, I am going to try to add
another crystal filter to the radio.

Daniel, KG4KRI
--- In TH-F6A <at> yahoogroups. com, Urantian <oneurantian <at> ...> wrote:
>
> Hi Daniel,
>
> I use the radio a lot for HF listening and I haven't had trouble
with CW. I'm using a Miracle Ducker IL with a telescoping antenna.
It's a great combination for one-handed portable use. I have great
reception from 80 through 17 meters.
>
> Are you using the CW mode setting, or USB/LSB? Or, is the trouble
with selectivity, in which the passband is too wide, and you are
hearing multiple signals?
>
> ---Michael, NO6O
>
>
>
>
> ----- Ori ginal Message ----
> From: d121075 <kg4kri <at> ...>
> To: TH-F6A <at> yahoogroups. com
> Sent: Saturday, April 12, 2008 9:46:48 PM
> Subject: [TH-F6A] Has anyone looked into upgrading the SSB/CW filter
or front end for HF?
>
> I am a new member, and I have had this great little radio for about
> four years. I use it the most sitting at night listening to 80 and 40
> meter cw with an external antenna, and I wish that I could modify the
> sideband filter to get a little more rejection of the opposite
> sideband, or maybe put in a roofing filter in the IF to reduce some of
> the front end overload. I may be asking too much of this little ht,
> but single-signal reception sure would be nice! Has anyone in this
> group experimented with hf r eception and the radio?
> Thanks,
> Daniel
> KG4KRI
>