Yes...I am thinking that its some kind of ground loop
or something. I just noticed that my LDVS version
started to act weird when I put the laptop on the plug
versus the battery
Mike WA3O
--- ehydra <[EMAIL PROTECTED]> wrote:
> Mike, do you carefully checked your OE polarity pin
> and the ordered VCC
> voltage spec?
>
> - Henry
>
>
> MIke mustang schrieb:
> > Guys,
> > I just spent 2 days trying to trouble shoot a
> weird
> > problem that I can not figure out. It started when
> I
> > modified an Xtall for computer control via the
> printer
> > port. All I did was make up the cable using the
> > BS170's and pulled the PIC and plugged the wires
> into
> > the socket in pins 8 for ground and pins 2 and 3.
> The
> > Xtall worked perfect with PowerSDR and si570.exe.
> The
> > only problem was the SI570 in the Xtall was the
> LDVS
> > version and I knew it would not drive the Softrock
> > directly so I ordered a CMOS version. I removed
> the
> > LDVS (was not fun) and CAREFULLY soldered in the
> CMOS
> > version. The CMOS version worked with the PIC so I
> > removed the PIC and plugged in the printer port
> > interface wires and it did not work at all. I
> tried
> > changing the pull ups to 10 k and adding the OE
> > (output enable) wired to 3 v still nothing. Then
> in
> > total desperation I removed the CMOS (not fun
> again)
> > and soldered in the LDVS version and everything is
> > working once again...am I missing something?
> >
> > thanks for your help
> >
> > Mike WA3O
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
> --
> www.ehydra.dyndns.info
>
