Re: Predistortion with FDM-DUO? #fdm-duo #fdm-sw2 #duo-art

Paul Andrews

Any pre-distortion processing would need to happen in the FDBM-DUO.   The USB path latency between the FDM-DUO and FDM-SW2 would preclude using the host PC.   My guess is that pre-distortion processing needs to be not much faster than speech processing or noise blanking done in firmware,

It's cool to think about.  I am always impressed by my local HF stations running 5 KHz wide and PureSignal running.

73 - Paul - W2HRO

On Tue, Jul 13, 2021 at 1:55 PM Neil Smith G4DBN <neil@...> wrote:
I guess you'd also need a whole bunch of extra CPU/FPGA/memory resource.

Would be very nice though.

Neil G4DBN

On 13/07/2021 16:54, Paul Andrews wrote:
> Neil,
> I'm thinking a little more about this pre-distortion feature.   Since
> the FDM-DUO is a full duplex radio, it should be possible to to use
> the Ant2 port for a TX sample input and output the pre-distorted TX
> signal on the Ant1 port.   Adding predistortion becomes a software
> only upgrade.  Yes?
> 73 - Paul - W2HRO

Paul Andrews
SVP - Sales & Marketing
TelVue Corporation
1-800-885-8886 x102

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