"Tio Pedro" wrote in message
...

"Richard Knoppow" wrote in
message
m...
As far as selectable sideband in an SSB adaptor
AFAIK all worked by means of either shifting the signal
to the filter frequency or having two filters. I don't
see how phasing would work in a receiving adaptor. There
were numerous phasing type SSB generator for
transmitting, for instance the one made by Barker and
Williamson who also made 90degree audio phase shifting
networks for use in home made ones. I still have the B&W
adaptor I used in the 1960s. It worked pretty well but
had to be adjusted for any large frequency change. Stable
high performance filters or reasonable cost pretty much
ended the use of phasing type exciters.

In any case, a good performing receiving adaptor
which would work on older receivers, especially tube
receivers, would be welcome. The old Hammarlund and TMC
units are pretty hard to come by and, I suspect,
something modern would outperform them.


--
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Richard Knoppow
Los Angeles, CA, USA

WB6KBL


The Central Electronic Sideband Slicer used phasing for
SSB reception.

On the other hand, the B&W 370 used the filter method.

Pete
I found the handbook for the CE box on BAMA and will have
a look at what they are doing.


--
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Richard Knoppow
Los Angeles, CA, USA

Richard Knoppow wrote:
I found the handbook for the CE box on BAMA and will have
a look at what they are doing.


Hi,

The Central Electronics Slicer was based on the GE Signal Slicer,
which appeared in GE Ham News, July-Aug 1951.

BANA has the issue, under the category gehamnews, filename ge0604.pdf

The GE article shows how to build it, including the the 90 degree
audio phase shift network. It's pretty slick -
a selectable sideband adapter based on a phase shifting circuit,
for any 450kc to 500kc i.f. receiver.

73,
Ed Knobloch

The reason I said either slicer or ssb adapter is as follows:

A slicer allows one to copy and select the sideband
on an older receiver such as the Hammarlund 129X.
The most prominent slicer was amde by Central Electronics there were two
versions, one just a slicer and another with a Q Multiplier which was
usually missing from older receivers. There were several other slicers on
the market. I had one called a VR
made in New England. RME made one to match the 4300/4350 receivers. This
was the only one that did not match 455 kcs IF's.

The best example of the ssb adapter was the Hammarlund HC-10 which added
another IF plus a slot and pass band filter. The SPC-10 was exactly the
same except sold to the DOD for six times as much as the HC-10. Frank
Lester (SK) designed these and helped incorporate them into several of the
Hammarlund receivers. TMC and several others made ssb adapters, too.

Both the slicer and SSB adapters made copying CW better too.

Dave K4JRB and still looking!

"David Thompson" wrote in message
...
The reason I said either slicer or ssb adapter is as follows:

A slicer allows one to copy and select the sideband
on an older receiver such as the Hammarlund 129X.
The most prominent slicer was amde by Central Electronics there were two
versions, one just a slicer and another with a Q Multiplier which was
usually missing from older receivers. There were several other slicers on
the market. I had one called a VR
made in New England. RME made one to match the 4300/4350 receivers. This
was the only one that did not match 455 kcs IF's.

The best example of the ssb adapter was the Hammarlund HC-10 which added
another IF plus a slot and pass band filter. The SPC-10 was exactly the
same except sold to the DOD for six times as much as the HC-10. Frank
Lester (SK) designed these and helped incorporate them into several of the
Hammarlund receivers. TMC and several others made ssb adapters, too.

Both the slicer and SSB adapters made copying CW better too.

Dave K4JRB and still looking!



The B&W 370 includes a SSB crystal filter.

My RME 4350 has a 455 kc if. Never owned the 4301, but expect it would have
taken the output after the 455 kc conversion.

73, Colin K7FM

"Edward Knobloch" wrote in message
news:KmoYj.505$ju1.354@trndny06...
Richard Knoppow wrote:
I found the handbook for the CE box on BAMA and will
have a look at what they are doing.


Hi,

The Central Electronics Slicer was based on the GE Signal
Slicer,
which appeared in GE Ham News, July-Aug 1951.

BANA has the issue, under the category gehamnews,
filename ge0604.pdf

The GE article shows how to build it, including the the 90
degree
audio phase shift network. It's pretty slick -
a selectable sideband adapter based on a phase shifting
circuit,
for any 450kc to 500kc i.f. receiver.

73,
Ed Knobloch


I have the full set of GE Ham News from the web so I'll
look for it. One of the patents is from R.B.Dome and was one
of those for the Dome stereo system for FM.


--
---
Richard Knoppow
Los Angeles, CA, USA

"Edward Knobloch" wrote in message
news:KmoYj.505$ju1.354@trndny06...
Richard Knoppow wrote:
I found the handbook for the CE box on BAMA and will
have a look at what they are doing.


Hi,

The Central Electronics Slicer was based on the GE Signal
Slicer,
which appeared in GE Ham News, July-Aug 1951.

BANA has the issue, under the category gehamnews,
filename ge0604.pdf

The GE article shows how to build it, including the the 90
degree
audio phase shift network. It's pretty slick -
a selectable sideband adapter based on a phase shifting
circuit,
for any 450kc to 500kc i.f. receiver.

73,
Ed Knobloch

I printed this out. The GE treatment is much more
informative than the CE handbook and the schematic is drawn
in a less confusing way.
This issue of GE Ham News does not have details of the
90degree network, it refers to an earlier edition which has
an artical on building a phasing type transmitting SSB
generator. That one does not appear to be on-line, at least
not on the BAMA site.
Its interesting to me that General Electric was hep to
SSB for ham use in about 1950 when it was still quite a
novelty. Of course SSB goes back into the 1930's for
commercial purposes, maybe even earlier. I don't remember
when AT&T began to use it for their transoceanic telephone
service.


--
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Richard Knoppow
Los Angeles, CA, USA