Re: [IRCA] phasing units, then and now

[Guy Atkins <dx@xxxxxxxxxxxxx>]

Hi Mark,

That was an excellent overview of DX hobbyist use of phasers! You covered
the early history which I wasn't aware of, as I was mostly DXing on the
tropical bands when Gordon Nelson and others did their pioneering work.

There is one more phase (LoL) developing now--software based methods using
coherent dual tuners (or channels).â I'm sure you're aware of Afedri's AFE822x
SDR-Net device
<http://www.afedri-sdr.com/index.php/new-afe822x-sdr-net-dual-channel>. It
was introduced a couple of years ago, but unfortunately software has not
appeared to easily take advantage of phasing. If you jump through a lot of
hoops and complexities with LINRAD, you can catch a glimpse of the future
of software phasing, but it's nothing practical for a DXer's use in my
opinion.

Much more recently, SDRplay's RSPduo <https://www.sdrplay.com/rspduo/> was
introduced with its dual tuners. I have one myself, mainly for its future
possibilities. I'm hoping that the 14-bit structure and additional front
end filters will provide better basic performance than earlier RSP models
I've owned.I expect it to be neck-and-neck with the AirSpy HF+ SDRs in a
quiet DXpedition setting...maybe not so much in my suburban RF jungle.

SDRplay looks to be the most active of all the SDR software developers, and
they say they fully intend to offer phasing features in a future release of
SDRuno software. Their activity, enthusiasm, and customer support make me
think they are the group most likely to take software phasing out of the
laboratory and into the DXer's shack. If he has the time and inclination,
Simon Brown of SDR-Console software could implement RSPduo phasing too, but
he's *not* dropped any hints about this.

73,

Guy Atkins
Puyallup, WA
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