actually the majority of SSB generators ARE reasonably phase coherent
over a relatively moderate passband with respect to their total
passband. The group delay 'ears' are on the edges of the filter. staying
between 600 and 2200 Hz should be OK for a 2400 Hz wide traditional
lattice sideband filter that os placed with the lower passband edge at
300 Hz.
Of course, new radios are all like a piece of wire.
On 22/06/2020 8:58 am, Al Beard wrote:
Hi Glen and all,
There's something I don't understand here:
In the SM1000 we have control of all the amplitudes AND
phases of all the audio carriers. Thus we may be able to do something
to reduce the peak levels that an IDEAL SSB generator will produce.
This is where I have a problem, the majority of SSB transceivers do
not have an ideal SSB generator. In particular, we loose the phase
consistancy.
Am I correct?
Alan VK2ZIW
On Mon, 22 Jun 2020 08:33:18 +1000, glen english wrote
Alan
it already goes through an SSB generator, and is already bandwidth
constrained. The bandwidth expansion because of an excess PAPR
event occurs where the signal cannot be faithfully reproduced- that
is stages beyond the sideband modulator- mostly the power amplifier,
but in reality all the way up the driver chain
On 22/06/2020 8:15 am, Al Beard wrote:
Hi David and Glen,
Just how is this going to be effective when the audio signal
is passed through an SSB generator?
You will also have to, in the maths, factor this in.
Am I wrong here?
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
---------------------------------------------------
Alan Beard
OpenWebMail 2.53
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
--
Glen English
RF Communications and Electronics Engineer
CORTEX RF
&
Pacific Media Technologies Pty Ltd
ABN 40 075 532 008
PO Box 5231 Lyneham ACT 2602, Australia.
au mobile : +61 (0)418 975077
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
