Re: 80dB now but still needs improvement at 1KHz [OT]

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Sujet : Re: 80dB now but still needs improvement at 1KHz [OT]
De : cd (at) *nospam* notformail.com (Cursitor Doom)
Groupes : sci.electronics.design
Date : 08. Nov 2024, 18:44:41
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <pcjsijldrjcuirj4fe0pajtdf1evj2rkhb@4ax.com>
References : 1 2 3 4 5 6 7 8 9 10 11 12
User-Agent : ForteAgent/8.00.32.1272
On Fri, 8 Nov 2024 12:41:18 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

Jan Panteltje <alien@comet.invalid> wrote:
>
[...] >
https://panteltje.nl/pub/audio_90_degrees_phase_shifter_circuit_diagram_
IMG_6958.JPG
>
Thst is a 90 degrees phase shifter over the speech audio range for
generating I and Q signals for SSB modulation. design is not mine, used
trimpots to test it :-)
>
After reading through some back issues of 'Rad Com', I had been thinking
along similar lines for generating SSB.  I was also intrigued by the
Weaver method and wondered if modern multi-stage filters between the
inverted and non-inverted audio sidebands  could reduce the audio notch
effect and allow a wider frequency response.
>
I let my licence lapse many years ago and had been thinking about taking
it out again before the call-sign got issued to someone else.  The
problem is that they need to see my certificate to prove I passed the
Radio Amateurs' Exam and I don't know where to find it.

You'd ace it. It's been dumbed down so much over the years you'd have
to be some kind of imbecile not to pass. I'm not sure if they still
have it in two parts: technical and legal. However, the legal bit is
pretty Janet & John as well.

Date Sujet#  Auteur
4 Nov 24 * 80dB now but still needs improvement at 1KHz64Edward Rawde
4 Nov 24 +* Re: 80dB now but still needs improvement at 1KHz62Jan Panteltje
4 Nov 24 i+* Re: 80dB now but still needs improvement at 1KHz23Bill Sloman
4 Nov 24 ii`* Re: 80dB now but still needs improvement at 1KHz22Edward Rawde
5 Nov 24 ii `* Re: 80dB now but still needs improvement at 1KHz21Bill Sloman
6 Nov 24 ii  `* Re: 80dB now but still needs improvement at 1KHz20Edward Rawde
6 Nov 24 ii   +* Re: 80dB now but still needs improvement at 1KHz8Jeroen Belleman
6 Nov 24 ii   i+- Re: 80dB now but still needs improvement at 1KHz1Jan Panteltje
6 Nov 24 ii   i+- Re: 80dB now but still needs improvement at 1KHz1Edward Rawde
6 Nov 24 ii   i`* Re: 80dB now but still needs improvement at 1KHz5john larkin
6 Nov 24 ii   i `* Re: 80dB now but still needs improvement at 1KHz4Jeroen Belleman
6 Nov 24 ii   i  `* Re: 80dB now but still needs improvement at 1KHz3john larkin
7 Nov 24 ii   i   `* Re: 80dB now but still needs improvement at 1KHz2Jeroen Belleman
7 Nov 24 ii   i    `- Re: 80dB now but still needs improvement at 1KHz1john larkin
18 Nov 24 ii   `* Re: 80dB now but still needs improvement at 1KHz11Liz Tuddenham
19 Nov 24 ii    `* Re: 80dB now but still needs improvement at 1KHz10Edward Rawde
19 Nov 24 ii     `* Re: 80dB now but still needs improvement at 1KHz9Liz Tuddenham
19 Nov 24 ii      `* Re: 80dB now but still needs improvement at 1KHz8Edward Rawde
19 Nov 24 ii       `* Re: 80dB now but still needs improvement at 1KHz7Jeroen Belleman
19 Nov 24 ii        +- Re: 80dB now but still needs improvement at 1KHz1Edward Rawde
19 Nov 24 ii        `* Re: 80dB now but still needs improvement at 1KHz5Joe Gwinn
19 Nov 24 ii         `* Re: 80dB now but still needs improvement at 1KHz4john larkin
19 Nov 24 ii          `* Re: 80dB now but still needs improvement at 1KHz3Joe Gwinn
20 Nov 24 ii           `* Re: 80dB now but still needs improvement at 1KHz2Jan Panteltje
20 Nov 24 ii            `- Re: 80dB now but still needs improvement at 1KHz1Joe Gwinn
4 Nov 24 i`* Re: 80dB now but still needs improvement at 1KHz38Edward Rawde
5 Nov 24 i `* Re: 80dB now but still needs improvement at 1KHz37Jan Panteltje
5 Nov 24 i  `* Re: 80dB now but still needs improvement at 1KHz36Edward Rawde
6 Nov 24 i   +- Re: 80dB now but still needs improvement at 1KHz1Bill Sloman
6 Nov 24 i   `* Re: 80dB now but still needs improvement at 1KHz34Jan Panteltje
6 Nov 24 i    +* Re: 80dB now but still needs improvement at 1KHz20Bill Sloman
6 Nov 24 i    i`* Re: 80dB now but still needs improvement at 1KHz19Jan Panteltje
6 Nov 24 i    i +* Re: 80dB now but still needs improvement at 1KHz2Liz Tuddenham
6 Nov 24 i    i i`- Re: 80dB now but still needs improvement at 1KHz1Jan Panteltje
6 Nov 24 i    i `* Re: 80dB now but still needs improvement at 1KHz16Bill Sloman
6 Nov 24 i    i  `* Re: 80dB now but still needs improvement at 1KHz15Liz Tuddenham
6 Nov 24 i    i   +* Re: 80dB now but still needs improvement at 1KHz13Bill Sloman
6 Nov 24 i    i   i`* Re: 80dB now but still needs improvement at 1KHz12Liz Tuddenham
7 Nov 24 i    i   i `* Re: 80dB now but still needs improvement at 1KHz11Jan Panteltje
7 Nov 24 i    i   i  `* Re: 80dB now but still needs improvement at 1KHz10Liz Tuddenham
7 Nov 24 i    i   i   `* Re: 80dB now but still needs improvement at 1KHz9Jan Panteltje
8 Nov 24 i    i   i    `* Re: 80dB now but still needs improvement at 1KHz [OT]8Liz Tuddenham
8 Nov 24 i    i   i     +- Re: 80dB now but still needs improvement at 1KHz [OT]1Jan Panteltje
8 Nov 24 i    i   i     +* Re: 80dB now but still needs improvement at 1KHz [OT]2Cursitor Doom
8 Nov 24 i    i   i     i`- Re: 80dB now but still needs improvement at 1KHz [OT]1Liz Tuddenham
8 Nov 24 i    i   i     `* Re: 80dB now but still needs improvement at 1KHz [OT]4ehsjr
9 Nov 24 i    i   i      `* Re: 80dB now but still needs improvement at 1KHz [OT]3Liz Tuddenham
9 Nov 24 i    i   i       `* Re: 80dB now but still needs improvement at 1KHz [OT]2Jan Panteltje
9 Nov 24 i    i   i        `- Re: 80dB now but still needs improvement at 1KHz [OT]1Liz Tuddenham
6 Nov 24 i    i   `- Re: 80dB now but still needs improvement at 1KHz1john larkin
6 Nov 24 i    `* Re: 80dB now but still needs improvement at 1KHz13Edward Rawde
6 Nov 24 i     +* Re: 80dB now but still needs improvement at 1KHz8john larkin
7 Nov 24 i     i`* Re: 80dB now but still needs improvement at 1KHz7Liz Tuddenham
7 Nov 24 i     i +* Re: 80dB now but still needs improvement at 1KHz3Jeroen Belleman
7 Nov 24 i     i i`* Re: 80dB now but still needs improvement at 1KHz2Liz Tuddenham
7 Nov 24 i     i i `- Re: 80dB now but still needs improvement at 1KHz1Jeroen Belleman
7 Nov 24 i     i `* Re: 80dB now but still needs improvement at 1KHz3john larkin
7 Nov 24 i     i  +- Re: 80dB now but still needs improvement at 1KHz1Bill Sloman
7 Nov 24 i     i  `- Re: 80dB now but still needs improvement at 1KHz1john larkin
7 Nov 24 i     `* Re: 80dB now but still needs improvement at 1KHz4Jan Panteltje
7 Nov 24 i      +- Re: 80dB now but still needs improvement at 1KHz1Edward Rawde
7 Nov 24 i      `* Re: 80dB now but still needs improvement at 1KHz2john larkin
7 Nov 24 i       `- Re: 80dB now but still needs improvement at 1KHz1Jan Panteltje
21 Nov 24 `- Re: 80dB now but still needs improvement at 1KHz1Klaus Vestergaard Kragelund

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