Elecraft

Re: Elecraft Digest, Vol 129, Issue 33

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Cortland Richmond-2

Re: Elecraft Digest, Vol 129, Issue 33

On 1/25/2015 6:11 PM, [hidden email] wrote:
> This is not only dangerous, it is potentially lethal.
> If there is a "UL" label on it, no doubt it is counterfeit. II have
> been using real Variacs and its competing US-brand devices for decades
> and have never run across something as egregious as that.
>
> Were I in your shoes I would cut off the cord and throw the device in
> the metal recycle bin. You have no idea what other dangerous things
> were incorporated by accident or by intention.

More, t*his needs to be reported to the CPSC* at
http://www.saferproducts.gov/Default.aspx
Importers and resellers will have to recall the item and refund what was
paid for it (if there are records, they're still around, etc etc. ).

Cortland Richmond
KA5S
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NK7Z

Re: Elecraft Digest, Vol 129, Issue 33

I wish the original post had not been trimmed... I missed it.
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

On Mon, 2015-01-26 at 09:01 -0500, CR wrote:

> On 1/25/2015 6:11 PM, [hidden email] wrote:
> > This is not only dangerous, it is potentially lethal.
> > If there is a "UL" label on it, no doubt it is counterfeit. II have
> > been using real Variacs and its competing US-brand devices for decades
> > and have never run across something as egregious as that.
> >
> > Were I in your shoes I would cut off the cord and throw the device in
> > the metal recycle bin. You have no idea what other dangerous things
> > were incorporated by accident or by intention.
>
> More, t*his needs to be reported to the CPSC* at
> http://www.saferproducts.gov/Default.aspx
> Importers and resellers will have to recall the item and refund what was
> paid for it (if there are records, they're still around, etc etc. ).
>
> Cortland Richmond
> KA5S
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> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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Cortland Richmond-2

Re: Elecraft Digest, Vol 129, Issue 33

In reply to this post by Cortland Richmond-2

On 25 Jan 2015 at 09:48 Jim Brown wrote:
> There are (at least) three reasons why an array of microphones is a
> really bad idea. First, really good sounding mics to work with our
> radios are widely available cheap. Second, a microphone is an
> electroacoustic device -- it collects sound at a point in space and
> converts it to voltage. A microphone at a different point in space
> collects different sound -- there is a difference in time

We've a more familiar radio analog; think of collinear antennas. If the
difference in path length between any two and the source is 1/2
wavelength (*sound* travels 1100m/sec at sea level pressure) that pair
will have a null at frequencies whose phase on arrival differs by 180
degrees. And that's only one thing we watch out for.

Interesting discussion, if a bit OT.

Cortland Richmond KA5S
KX3 1475
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gdaught6

Re: Elecraft Digest, Vol 129, Issue 33

It was recently written...

< snip >

> (*sound* travels 1100m/sec at sea level pressure)

Can't let that one get by. It's about 1100 feet per second, not meters per second.

73,

George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 3-4, 2015

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Phil Hystad-3

Re: Elecraft Digest, Vol 129, Issue 33

Or, 340 m/s.

Or, 761 mph

Or, 0.00000135 times the speed of light.

> On Jan 26, 2015, at 9:55 AM, [hidden email] wrote:
>
> It was recently written...
>
> < snip >
>
>> (*sound* travels 1100m/sec at sea level pressure)
>
> Can't let that one get by. It's about 1100 feet per second, not meters per second.
>
> 73,
>
> George T Daughters, K6GT
> CU in the California QSO Party (CQP)
> October 3-4, 2015
>
>
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Harlan Sherriff

Re: Elecraft Digest, Vol 129, Issue 33

In reply to this post by Cortland Richmond-2

Well... actually it depends on a couple of factors. Temperature, humidity, and medium it is traveling through.
343.2 m/sec in dry air at 20C.
1484 m/sec in water
5120 m/sec in iron

Crap.....that is more than I need to know

Harlan
NC3C
Sent from my Verizon Wireless 4G LTE smartphone
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David Christ

Re: Elecraft Digest, Vol 129, Issue 33

In reply to this post by Phil Hystad-3

Hey, back in horse and buggy days it traveled at 2,045,568 furlongs per fortnight.

Lets not ask what it would be in Smoots per semester.

David K0LUM

On Jan 26, 2015, at 1:50 PM, Phil Hystad <[hidden email]> wrote:

> Or, 340 m/s.
>
> Or, 761 mph
>
> Or, 0.00000135 times the speed of light.
>

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