Mods for Heath DX-100B and Apache

[Charles W. Morehouse]

Hi Keith,
Restoring a TX-1 to a 10. As a design engineer, I came to the same conclusion. Was
considering bypassing the clipping stages, but decided it had to be missadjustment. As a
purist, don't like mods. Have used the circuits before and they sounded fine and improved the
modulation and speech quality. Most modern xcvers do the same thing.  Will also have my RX-1
on air soon. Talk soon and 73.
Wayne;
W4GBW

k4kgw wrote:

> The audio on the TX-1 needs no modification.  The problem that most people encounter has
> to do with the audio limiter in the rig.  The instructions in the manual are not as clear
> as they should be, but if you read them over and over until you understand how it works,
> you'll find they have magnificent audio.
>
> BAsically, the max audio level is set by the infernal screwdriver adjustment that is
> accessed thru the CW jack, and the amount of limiting is set by the front panel audio
> control.  This was not a very good design, because it is almost impossible to access the
> setting inside the CW jack without taking the rig out of the cabinet.
>
> Keith
>
> Larry Knapp wrote:
>
> > Fern - There are quite a number of internet references to modifications for the
> > DX-100/100B and TX-1, Apache, as well as many of the other well known
> > "boatanchor" gear.  I'm sure there must be some references to the SB-10 as it
> > was a very popular accessory; tho I am not aware of anything directly.  Some
> > searches of the Internet could probably locate some.
> >
> > Some of my favorite links are:
> > http://dmoz.org/Recreation/Amateur_Radio/Boatanchors/
> > http://www.thebizlink.com/am/tech/htm/mods.htm
> >
> > In addition the publication Electric Radio has over the years (dating back to
> > May 1989 to November 2000) some excellent articles on the old radios.  It is
> > well worth the investment.  A index has been created by N900 for Electric Radio
> > and is found at:
> > http://www.qsl.net/n900
> > Continue to look at Electric radio for I'm sure hopeful there will be an
> > upcoming article on audio modifications to the DX-100/100B...as an aside.
> >
> > Also the AM Press exchange, on-line internet, has some excellent articles on
> > modifcations to the old gear for AM usage; there are some references to the
> > Apache and DX-100/100B.  Their address is:
> > http://www.bigcountry.com/w5ami/ampx/ampx.htm
> >
> > The TX-1 and DX-100/100B are excellent heavy old boatanchors and still sound
> > very good today.
> >
> > Hope this helps......Larry, KC8JX, St. Joseph, Mi
> >
> > --- Fern Rivard <crc at cyberlink.bc.ca> wrote:
> > > I have two friends who have the DX-100B and Apache transmitters and they
> > > would like to know of any mods done to improve the performance of both rigs.
> > > Was there also some upgrades on the SB-10 sideband adapter? Best of 73's
> > > from Fern
> >
> > =====
> > May your days be full of sunshine and good thoughts fill your head.
> > From: Larry Knapp, KC8JX, St. Joseph, Mi  49085
> >   Best 73's
> >
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