Hi Chris.
In my original reply to your post I mentioned SDR-RADIO.com - it will have client-server architecture just like HRD. -Tom- From: [email protected] [mailto:[email protected]] On Behalf Of CHRIS Sent: Saturday, September 19, 2009 5:03 PM To: [email protected] Subject: [soft_radio] Re: Wish List for SDR software Hi Alberto, Many thanks to you - and others - who answered my post. First, I should make it clear I am not a programmer and am quite new to SDR. But longtime ham and enthusiast for digital modes, remote radio control etc. I first read about polyphase FFT on Alex VE3NEA website. http://www.dxatlas.com/Rocky/Advanced.asp It is most interesting. However, I may be confusing Polyphase FFT technique with the Rocky waterfall display which is attractively different to other SDR programs. Second, regarding frequency resolution. No, I am not referring to the excellent lower waterfall window of WinRad - rather to the ability to read/adjust the LO and TUNE frequency readouts with increased resolution - down to 0.1Hz. Winrad HD is already a step in the right direction with 1Hz resolution - as is Sigmira. Sigmira is also worth looking at as it allows modes AM, LSB, USB etc all drive the phase display, allowing the frequency readout to be closely synchronised with WWV or any other signal. So in a few seconds you can see the tue carrier frequency displayed to within 1 Hz. But even 1Hz resolution is not enough to bring the Sigmra phase display to a complete stop on my SDR-IQ. For that 0.1Hz control would be better. Plus the ability - like Sigmira - to make a semi-permanent correction to the inherent NCO error in the SDR-IQ - around 185Hz at 15MHZ in my unit. Maybe I don't understand how to compensate clock frequency in SDR14/IQ control panel? One other thing I omitted to mention in my original post is to ask if a future SDR program might be based on seperate server/client architecture? This would allow location of SDR at a remote site and control via internet? I think SpectraView 3 can do this but it is not as useful for ham radio applications as WinRad. A question - what broadband data rate would be needed to reliably operate a remote SDR-IQ for instance? Finally, I must emphasise that WinRad is a clear favourite for me in most respects over the other programs mentioned. So my suggestions are made with respect to making an already fine program even better! I will be following future discussion with grat interest! 73, Chris ZL1BOE --- In [email protected] <mailto:soft_radio%40yahoogroups.com> , "i2phd" <i2...@...> wrote: > > --- In [email protected] <mailto:soft_radio%40yahoogroups.com> , jan van katwijk <j.vankatwijk@> wrote: > > > > newbie question: what is polyphase-fft? > > A good tutorial, one of those which I used when coding that in Winrad, can be found here : > > http://archive.chipcenter.com/dsp/DSP000315F1.html > > > If you are talking about 1Hz resolution (or better), I assume you > > want some kind of zooming mechanism that, given an interesting > > subrange of a spectrum, you can enlarge that particular part.? > > This is exactly what the lower windows in Winrad is meant for... > > 73 Alberto I2PHD >
