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- Subject: Re: [CapeDX] Re: dual receiver SDRs for diversity reception / phasing
- From: Mark Connelly <markwa1ion@xxxxxxx>
- Date: Thu, 17 Jan 2019 04:02:43 +0000 (UTC)
- Delivered-to: irca@xxxxxxxxxxxxxxxx
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The consensus seems to be that nobody's yet doing after-the-fact phasing that works in an intuitive, relatively easy to use, non-geeky way.
We've seen great strides in SDR technology over the past ten years but, possibly due to declining interest in medium wave and shortwave, we might not see the will of manufacturers to advance things to the next level. Reliable after-the-fact phasing is certainly one of the "next big things" but I wonder if this is such a specialized / niche interest that the considerable amount of work needed to make it happen may never occur. Or things stay at the geek level with 10 different incompatible solutions all requiring C++/Java proficiency and none having more than a half dozen users.
Could some other aspect of the SDR use such as FM DX or VHF (and up) utilities be the thing that gets phasing in capture files off the launch pad? If the user bases in those parts of the hobby are larger and younger than the MW/SW contingent, maybe so.
Mark Connelly, WA1ION
South Yarmouth, MA
-----Original Message-----
From: daiche@xxxxxxxxx [CapeDX] <CapeDX@xxxxxxxxxxxxxxx>
To: CapeDX <CapeDX@xxxxxxxxxxxxxxx>
Sent: Wed, Jan 16, 2019 12:17 pm
Subject: [CapeDX] Re: dual receiver SDRs for diversity reception / phasing
 It is my understanding that Linrad can record the 2 inputs of an Afedri, or any two independent RF streams for that matter, into R/L channels of a recording for 'after-the-fact' nulling and playback. Done that way, the 2 streams are synchronized. I have not explored this at all, since quite frankly I find Linrad painfully complex to use. Regardless of Linrad's potential function, none of the existing digital phasing software is easy or 'fun' to use. I guess it will take more interest from DX'ers like us to create a strong enough need to do it right.
My interest has been more around curiosity at this point, although the Afedri 822X does work well to make 'fixed phase' captures of MW. It's span size will allow a capture of 530Khz to 1620Khz, for example. You set the nulling up ahead of time to do scheduled recordings later. And yes you are right, this only eliminates an external phaser box and some of the losses from analog phasing, done the way I am using it.
Dave Aichelman   N7NZH   Grants Pass, Oregon
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