Re: [IRCA] Elad FDM-S2 initial testing

[Neil Kazaross <neilkaz58@xxxxxxxxx>]

I never bought an Elad due to concerns about strong signal handling. A
local Ham who has 5 acres full of antennas agrees and much prefers his
Excaliber SDR to the Elad.  73 KAZ

On Thu, Mar 9, 2017 at 1:14 AM, Chuck Hutton <charlesh3@xxxxxxx> wrote:

> Guy -
>
>
> It really doesn't take much of a flash drive or SD card to keep up with
> SDR (Perseus) recordings. Perseus needs 64 mb/s (megabits) or 8 MB/s when
> recording 1.6 MHZ worth of signals. Almost any SD or flash can do that.
> Even the slowest flash drive in the link you sent handles 400 mb/s.
>
>
> In the real world, I've not had a problem with using garden variety SD
> cards. Units that support SDXC (over 32 G) are common and I put a 128 GB SD
> in my T100TAF.
>
> To me, the problem with the 1 USB port tablets is that with most, you
> can't connect a Perseus and charge the unit at the same time. Of my
> tablets, only my Dell Venue 8 Pro lets me do both via an adaptor. I'd love
> to hear about other devices that support this. It's part of the USB
> charging specs to allow this, so maybe more manufacturers will hop on the
> bandwagon.
>
> Chuck
> ________________________________
> From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Guy Atkins <
> dx@xxxxxxxxxxxxx>
> Sent: Wednesday, March 8, 2017 10:04 PM
> To: Mailing list for the International Radio Club of America
> Subject: Re: [IRCA] Elad FDM-S2 initial testing
>
> Hi Mark,
>
> I can second what Chuck has said-- modern Atom processors can handle SDRs
> with CPU cycles to spare as long as you don't go crazy and try to run too
> many programs at once.
>
> I have a Asus T100TA Transformer tablet/keyboard combination that has the
> Bay Trail-T Z3740 processor and runs my FDM-S2 well, including MW recording
> to an external SSD. I haven't used this combo since last fall and don't
> recall the CPU percentage when recording or playing back files.
>
> Here's a YouTube video I made of an older HP Stream 7 tablet (Atom Z3735)
> running the Elad SDR, at around 13% CPU:
> https://www.youtube.com/watch?v=6FAwxwI95Zg
> [https://www.bing.com/th?id=OVP.Ve14a0d986e342656a887607498df015b&pid=Api
> ]<https://www.youtube.com/watch?v=6FAwxwI95Zg>
>
> HP Stream 7 - Elad FDM-S2 SDR Demo<https://www.youtube.com/
> watch?v=6FAwxwI95Zg>
> www.youtube.com
> This short video demonstrates that the Elad FDM-S2 software defined radio
> runs well on the $99 HP Stream 7 Windows 8.1 tablet. In the demo the entire
> medium ...
>
>
>
>
> It's worth noting that the other external bits and pieces needed to run a
> WAV file recording, Atom tablet or laptop powered SDR setup can be fiddly,
> with OTG adapters, possibly powered USB hubs, and external drives and
> cables. However, I've found that the faster MicroSD cards or USB flash
> drives like this Sandisk Extreme model
> <http://thewirecutter.com/reviews/the-best-usb-3-0-thumb-drive/> can
> [http://thewirecutter5.wpengine.netdna-cdn.com/wp-
> content/uploads/2016/02/02-usb-thumb-drives-sandisk-extreme-cz80.jpg]<
> http://thewirecutter.com/reviews/the-best-usb-3-0-thumb-drive/>
>
> The Best USB 3.0 Flash Drive | The Wirecutter<http://
> thewirecutter.com/reviews/the-best-usb-3-0-thumb-drive/>
> thewirecutter.com
> SanDisk has released a new flash drive featuring the new USB Type-C
> standard. SanDisk claims that the Ultra USB Type-C drive offers sequential
> read speeds up to 150 ...
>
>
>
> substitute for an SSD drive for a few hours of MW recording depending on
> size (Gb). I have also used the tiny Sandisk Ultra Fit flash drive
> successfully.
>
> 73,
>
> Guy Atkins
> Puyallup, WA
>
> >
>
> >
>
> >
> > ---------- Forwarded message ----------
> > From: Mark Connelly <markwa1ion@xxxxxxx>
> > To: nhp@xxxxxxxx, irca@xxxxxxxxxxxxxxxx
> > Cc:
> > Bcc:
> > Date: Wed, 8 Mar 2017 12:05:12 -0500
> > Subject: Re: [IRCA] Elad FDM-S2 initial testing
> > With the Perseus I had a similar experience.  Atom-based netbook (MSI
> > Wind) gave me OK record / playback up to 800 kHz bandwidth but it
> couldn't
> > cut the mustard for 1600 kHz wide captures.  Core i3 or higher: no
> problem.
> >
> > Are DXers using any netbook form-factor PC's (screen 10 to 13 inch range)
> > that have i3 or better CPU's?  Seems like that's what you'd really want
> for
> > backpacking.  Battery life in excess of 4 hours (including the receiver's
> > loading) would be a plus.
> >
> > Of course you still have to deal with getting an antenna out there,
> > hopefully a directional one.  Roll of skinny wire to stretch on the
> ground
> > + a matching / isolation transformer might work but grounding still has
> to
> > come into play.  Directivity would be sketchy at best.  A wire loop is
> > likely better (whether cardioid or figure-of-8 pick-up).  The support
> > structure for that (when trees are lacking) is going to be a bigger
> > impediment to backpacking than the laptop + SDR combo.  Tuned loops, of
> > course, can be quite compact but then you're essentially limited to one
> > frequency at a time (live) DXing instead of wideband capture for later
> > analysis.  Active whips are also compact but they can be "noise getters"
> if
> > placed within 20 ft. or so of the laptop.  No directivity with those
> > either, although a shore site produces directivity independent of the
> > antenna.  Single stick pattern of my 1240 local demonstrates that:
> > http://radio-locator.com/cgi-bin/patg?id=WBAS-AM&h=D
> >
> > (That map shows why Florida, Cuba, Puerto Rico, Venezuela, etc. bomb in
> > here ... Midwest not so much.)
> >
> > I would always take a competent ultralight portable in the backpack as
> > well, just in case something with the PC + SDR goes "kerflooey."  No
> sense
> > to go out there and come back with nothing, especially if considerable
> > flying, driving, biking, or hiking was involved.
> >
> > Mark Connelly, WA1ION
> > South Yarmouth, MA
> >
> >
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