Weaver's method

[Adrian Tuddenham]

Does anyone have any experience of designing an SSB modulator using
Weaver's Method (AKA The Third Method). I have some thoughts on it that
I would like to bounce off someone with a better knowlede of it than I
have.

--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

 

[Phil Hobbs]

On 2020-03-19 17:30, Adrian Tuddenham wrote:

Does anyone have any experience of designing an SSB modulator using
Weaver's Method (AKA The Third Method). I have some thoughts on it that
I would like to bounce off someone with a better knowlede of it than I
have.

The sideband folding thing? Never tried it--I'm not a ham and haven't
worked in RF voice communications in almost forty years (1981-83, good
times).

I did do a phasing-method SSB receiver long ago, using a LMF100
switched-cap filter as the low-frequency Hilbert transformer, which
worked great. It was for a laser inteferometer detector for aerosol
particles. Interferometers are amplitude-sensitive, so the required
dynamic range is the square root of what you'd need in an
intensity-sensitive system. That meant that a noisy SC filter was no
problem, and the SSB detection got me a 3-dB SNR improvement, equivalent
to doubling the laser power.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Clifford Heath]

On 20/3/20 8:30 am, Adrian Tuddenham wrote:

Does anyone have any experience of designing an SSB modulator using
Weaver's Method (AKA The Third Method). I have some thoughts on it that
I would like to bounce off someone with a better knowlede of it than I
have.

You should ask in detail here, but also in SDR forums.

It's normal for SDR systems to digitise I and Q and do the weaver thing
in software, so there are folk who know about that.

Clifford Heath

 

[Piglet]

On 20/03/2020 20:55, Adrian Tuddenham wrote:

Clifford Heath <no.spam@please.net> wrote:

On 20/3/20 8:30 am, Adrian Tuddenham wrote:
Does anyone have any experience of designing an SSB modulator using
Weaver's Method (AKA The Third Method). I have some thoughts on it that
I would like to bounce off someone with a better knowlede of it than I
have.

You should ask in detail here, but also in SDR forums.

It's normal for SDR systems to digitise I and Q and do the weaver thing
in software, so there are folk who know about that.

I was looking at analogue methods (sorry, I should have said that at the
outset).

You may have good luck searching amateur radio sites, forums and blogs.
From my limited knowledge a bugbear is the matching in amplitude and
phase response needed for the two pilot-tone filters. There is also that
weird notch in the passband around the pilot tone that speech doesn't
much notice but is hardly suitable for hi-fi!

piglet

 

[Adrian Tuddenham]

Clifford Heath <no.spam@please.net> wrote:

On 20/3/20 8:30 am, Adrian Tuddenham wrote:
Does anyone have any experience of designing an SSB modulator using
Weaver's Method (AKA The Third Method). I have some thoughts on it that
I would like to bounce off someone with a better knowlede of it than I
have.

You should ask in detail here, but also in SDR forums.

It's normal for SDR systems to digitise I and Q and do the weaver thing
in software, so there are folk who know about that.

I was looking at analogue methods (sorry, I should have said that at the
outset).


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

 

[Clifford Heath]

On 21/3/20 7:55 am, Adrian Tuddenham wrote:

Clifford Heath <no.spam@please.net> wrote:

On 20/3/20 8:30 am, Adrian Tuddenham wrote:
Does anyone have any experience of designing an SSB modulator using
Weaver's Method (AKA The Third Method). I have some thoughts on it that
I would like to bounce off someone with a better knowlede of it than I
have.

You should ask in detail here, but also in SDR forums.

It's normal for SDR systems to digitise I and Q and do the weaver thing
in software, so there are folk who know about that.

I was looking at analogue methods (sorry, I should have said that at the
outset).

Yes, but addition is addition whether it's analog or digital.

CH