[R-1051] R-1051 Speakers

[paul swed]

Hey Jim because R1051s were great HF mux receivers using the UCC1.
But we strayed just a bit off the direct 1051 discussion.
Regards
Paul

On Thu, Dec 12, 2019 at 2:15 PM Jim Haynes <jhhaynes at earthlink.net> wrote:

> On Thu, 12 Dec 2019, David I. Emery wrote:
>
> > On Thu, Nov 21, 2019 at 10:17:52AM -0500, paul swed wrote:
> >
> >       FWIW it is also notable that - internally in telco plant -
> > similar carrier telegraph circuits on voice grade channels were used as
> > long ago as the 1930s though some of these were AM (OOK) rather than
> > FSK.  And before that WU and other telegraph companies used various
> > similar audio FDM multiplexing as well as the more common TDM on
> > various telegraph lines.
>
> I recall reading that one of the problems WU had in going to FDM was
> that so many of their open wire lines were ground-return telegraph
> circuits, so it was hard to find a pair of wires that could be used
> for a voice-grade circuit.  Also that Postal Telegraph had originally
> built their lines to be voice grade because they expected to use the
> early FDM "harmonic telegraph" that Elisha Gray and A.G.Bell were
> experimenting with in the early days.
>
> I forget what this has to do with R-1051s.
>
> Jim W6JVE
> ______________________________________________________________
> R-1051 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-1051
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-1051 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>