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Re: [IRCA] New Grayland SDR WAV Files

Ken -


I'm not Guy, but I hope for a promotion some day.


As I hear it, there's only 1 mod for the HF+ and it is for improved LW sensitivity. It doesn't affect MW.


Chuck


________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of ken brookner <kenb@xxxxxxxxxxxx>
Sent: Sunday, September 2, 2018 6:46 PM
To: Mailing list for the International Radio Club of America
Subject: Re: [IRCA] New Grayland SDR WAV Files

Hi Guy,

Was that an unmodified HF+?

Thanks for posting your comparison!

73,

Ken
Lummi Island, WA

Guy Atkins wrote on 9/2/2018 5:46 PM:
>
> *I went to Ocean City State Park for a few hours, specifically to test the
> RSPduo, FDM-S2, and HF+ receivers on weak daytime medium wave signals. The
> antenna used was the Wellbrook ALA1530LN Pro, and all radios were operated
> with SDR-Console V3 fed from a single 4-way antenna splitter. All coax from
> the splitter to receivers was identical lengths of the same type of cable..
> This way the only variables were the SDRs themselves...all modes,
> bandwidths, etc. were the same.*
>
> *My key takeaways, specifically related to MW weak signal performance:*
>
>
> *The FDM-S2 gives excellent reception, that in my past experience equals or
> out-performs a Perseus SDR *except* in strong signal areas (Perseus has
> more built-in band pass filters to help protect the front end). Some others
> have noticed the S2's "edge" over Perseus at times, too. *
>
> *AirSpy HF+: I knew these are over achieving SDRs for the price, but
> Friday's careful comparisons proved their outstanding performance! My HF+
> receivers always equalled the FDM-S2. That's really saying something! NO
> attenuator or gain adjustments on the HF+ are needed; it handles large
> signals extremely well. If you dive far enough into settings you  *can*
> make adjustments but it's not needed.*
>
>
> *The RSPduo trails the pack significantly, with generally noisy reception
> and "fiddly", complicated to adjust gain/attenuation settings for best
> reception. I think the radio is great for the hobbyist with interests on
> different bands, but except for the potential of eventual phased (coherent)
> tuners in future versions of the software, there are better choices for the
> MW DXer. That said, the RSPduo is the best performing SDRplay product yet..
> Caveat: I may not have adjusted gain settings optimally on the RSPduo
> before recording with it at Ocean City. However, at Grayland with this
> radio and a 160 ft. DKAZ antenna I did little adjustment and found that I
> was hearing the same DX the other fellas were hauling in. The radio didn't
> seem noisy in that situation, either. My gut feeling though is that the
> RSPduo is not a top tier SDR like the others. It's very good for the price
> (plus the two tuners inside) but not up to the DX ability of the Elad or
> AirSpy.*
>
> *(Interestingly, with ALL FOUR receivers recording WAVs, the total CPU
> usage was just 6.7% and the GPU usage (nVidia CUDA graphics card) was 75%..
> Wow, 6.7% CPU with all radios recording full-bore?! I'm very pleased with
> the horsepower of this "new" Dell workstation laptop.*
>
> So Chuck, I've taken a lot more words to summarize what you stated so well.
> The RSPduo is not a top contender but worth considering if a DXer wants to
> cover a lot of other bands too.
>
> 73, Guy
>
>

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