SV: [sdiy] Re: SV: Re: Saw phase shifter used in frequence shifting.

[karl dalen]

--- Magnus Danielson <cfmd at bredband.net> skrev:

> > I was talking about the SSB DSB shifters, dont they use just a simple
> > LPF filter between each multiplyer! Maybe the allpass type sound better 
> > then the SSB? I have no idea since i have never built a Frequency shifter
> unit!
> 
> Sorry, I don't have all the frequency shifter layouts in clear memory, so you
> can't expect me to have all the details, pros and cons directly available,
> now
> can you?

No not at all, offcourse i havent requested you to know everything,
just interpreted  what you said as if using "allpass stage type " of shifter.

> What is a common problem however, is the 90-degree angle of the oscillators,
> since that will affect the mirror-cancelation which makes it become more than
> a  expensive form of a ringmodulator.

> I have Mike Gingells PhD report online at
> http://rubidium.dyndns.org/~magnus/synths/friends/gingell/
> and in there you also find a review of different SSB techniques and their
> pros
> and cons. Highly recommened.

Will have a peek at that!

KD