[TenTec] TenTec Digest, Vol 156, Issue 4

[Barry N1EU]

Here are some numbers for the ANAN-100D:

CW Receive Latency

512 buffers 58msec
1024 buffers 87msec
2048 buffers 133msec


Latency was measured by recording the external keyer sidetone audio and
measuring the delay till SDR recovered signal audio.

And actually, the filter shape is quite acceptable with 1024 buffers.  See
filter plots I made at http://anan-100d.wikidot.com/100d-buffer


73, Barry N1EU

On Mon, Dec 7, 2015 at 7:49 AM, Barry N1EU <barry.n1eu at gmail.com> wrote:

> Ha, I love a good tussle  ;-)
>
> I measured it on an ANAN-100D about a year ago.  I've seen numbers for the
> Flex 6K that are similar.  Latency of about 100-150msec for cw receive and
> ssb receive and transmit.  CW transmit latency in the ANAN and Flex is very
> low (on the order of tens of msec) because they both optimize it in the
> FPGA.
>
> 73, Barry N1EU
>
> On Mon, Dec 7, 2015 at 5:45 AM, rick at dj0ip.de <Rick at dj0ip.de> wrote:
>
>> Yes, it used to be much worse.
>> It is now 350 mS unless there has been some VERY recent change.
>>
>> Barry, if you say it's better, please specify who measured it and
>> approximately when.
>> Otherwise I strongly disagree.
>>
>> I am quoting recent measurements by Rob Sherwood.
>> Somewhere buried in 10,000 emails I have a recent email from Rob
>> confirming
>> this.
>> It was while running one of the big contests earlier this year.
>>
>> I'm not talking about old 5000 rigs, I mean the new flagship line, 6xxx.
>>
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt, Germany)
>>
>>
>>
>> -----Original Message-----
>> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Barry
>> N1EU
>> Sent: Monday, December 07, 2015 11:29 AM
>> To: Discussion of Ten-Tec Equipment
>> Subject: Re: [TenTec] TenTec Digest, Vol 156, Issue 4
>>
>> Rick, the latency on the latest SDR offerings has come WAY down,
>> especially
>> on the Flex 6000 series.  They ARE contest capable.
>>
>> I agree on the knobs.  I applaud the Flex Maestro interface panel - I
>> think
>> it's a harbinger of products to come in the future, where many vendors can
>> offer various front panels that can be interfaced to many different SDR
>> types.  Or someone could write the code to use an Orion front panel to
>> control an SDR, etc.
>>
>> For me, the draw of the direct sampling SDR radios (ANAN, Flex 6K) is that
>> their receivers simply sound better than the best superhet/dsp i.f.
>> radios.
>>
>> With the introduction of the not-overly-impressive IC-7300, perhaps we'll
>> be
>> seeing several direct sampling (DDC/DUC) bundled in a fully knobbed
>> self-contained box in the next 1-3 years.
>>
>> 73, Barry N1EU
>>
>> On Mon, Dec 7, 2015 at 7:24 AM, rick at dj0ip.de <Rick at dj0ip.de> wrote:
>>
>> > EXCEPT . . .  for latency and lack of affordable knobs.
>> >
>> > Last reviews I saw still had turnaround latency between TX and RX at
>> > 350 mS.
>> > If both ops are running SDR, and trying to run full QSK, that's 0.7
>> > seconds.
>> > It's gonna sound like "Chop Phooey" on the air!
>> >
>> > The set of knobs (Maestro) for the lowest cost $2000 Flex Radio (in
>> > the class that interests most of us) is $1200 or so.  OR...the big
>> > single knob from Flex will set you back $200 if you are willing to
>> > wait long enough to get one.
>> >
>> > A decent 3rd party set of knobs, such as the Wood Box Radio T-MATE-2
>> > probably has enough knobs for most of us, but it will set you back
>> > $300 AND Flex software won't support it.  You need a 3rd party
>> > software (i.e. N4PY Radio Control Software) to use it with your Flex.
>> > Get it all set up and working with your WIN7 computer, then upgrade to
>> WIN10 and watch the "real"
>> > fun begin.
>> >
>> > Other than that, there's not much wrong with the current crop of SDR
>> > radios...
>> >
>> > 73 - Rick, DJ0IP
>> > (Nr. Frankfurt, Germany)
>> >
>> >
>> > -----Original Message-----
>> > From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Kim
>> > Elmore
>> > Sent: Monday, December 07, 2015 2:40 AM
>> >
>> > There's absolutely nothing wrong with SDR; I don't fully understand
>> > why so many people complain about it
>> >
>> >
>> > -------
>> >
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