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Re: LF: Weaver Modulator with Spectrum Lab

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Weaver Modulator with Spectrum Lab
From: Andy Talbot <[email protected]>
Date: Thu, 14 Apr 2016 18:54:24 +0100
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That seems a very convoluted (!!) way of doing what is actually quite a simple process.
Input low-pass filter,  I/Q mix with a centre tone, low pass filter the output- and there's the baseband signal you need for upconversion to any band you want from LF to microwaves.

It ought to be possible to do everything in a single DSPIC

It would be great to do the first part of this http://www.g4jnt.com/ThirdMethodUpconverter.pdf in a single chip.

Andy  G4JNT


On 14 April 2016 at 18:27, Wolfgang Büscher <[email protected]> wrote:
Hi Warren,

It's not strictly the Weaver method but there is an SSB 'up-converter' with I and Q outputs in SL.
It actually uses a forward and inverse FFT, and cos^2 windowing (with 50 percent overlap) :

http://www.qsl.net/dl4yhf/speclab/filters.htm#filter_as_iq_modulator

All the best,
  Wolf DL4YHF .


Am 14.04.2016 um 18:47 schrieb Warren Ziegler:
Hello the list...

   Has anyone attempted to do a Weaver modulator to generate a baseband
ssb signal in Spectrum Laboratory?
  Looks like it should be possible...




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