[Test-Equipment] Off subject

Mon Jan 20 15:26:08 EST 2014

Hi Roger:

The reason that I mentioned the $150.00 ecg instrument is because I wore a 
portable monitor several times including at Mayo, for up to a week at a 
time.  In each case I had the symptom which I will call Flutter, they called 
it noise.  You could feel it by placing your hand on the chest.  While I was 
wearing the portable monitor it occurred hundreds of times and I depressed 
the marker button.  The diagnosis came back as noise!!!!!  It was vibrating 
at 300BPM and at times the only way to stop it was to run around the house 
to get the rate up and stable.  The real essence of the story is a doctor is 
only as good as his diagnostic equipment.  The portable ECG instruments that 
are worn today are obviously far inferior to the Asian version and I believe 
dangerous to use.  Seems nobody knows how to read the data.  I have three 
photos of the strips that I captured.  One normal, one the transition from 
normal to  arrhythmia, and one in full flutter, all of which took 10 minutes 
of my time.  They are available to display what that silly little instrument 
can do for you.

Kindest regards Jim

-----Original Message----- 
From: w3sz
Sent: Monday, January 20, 2014 1:53 PM
To: test-equipment at mailman.qth.net
Subject: Re: [Test-Equipment] RF spectrum analysis

Just to add to the off-topic but very interesting comment ;)

There is a nice iPhone add-on that I have several of my afib patients
using so they can tell if/when they are in afib.
http://www.alivecor.com/home

For the smart ones [i.e. the ones I trust to read an EKG after some
quick training] this can make a big difference in their therapy.  Not
suitable for everyone, but there seems to be a rather strong positive
correlation between iPhone ownership and IQ, so most people to whom this
would apply can be trained for the task  ;)

73,

Roger Rehr
W3SZ

73, Roger Rehr W3SZ http://www.nitehawk.com/w3sz
On 1/20/2014 12:42 PM, james.liles at comcast.net wrote:
> Hi David:
>
> Very interesting instrument!  Would like to see its range down to 100 or 
> 200
> cycles especially for audio like the guitar man.  Will have to tear the
> romance sheet apart to see if it will wind up in the shop.
>
> There is a notion that the Asian test gear is somehow inferior or
> unreliable.  I have one Asian instrument that I use to do temperature
> compensation measurements and calculations for analog VFO work. It is a
> capacity meter that will measure down to .001pf and not drift for hours.
> Just don't walk within 6 feet of the test setup because it will see you. 
> We
> use it to measure class 1 temperature compensating capacitors because they
> have a +-30ppm range.  Even an NPO or COG cap has a +-30ppm range.
>
> Show me a western instrument that is that precise ---- Yep for under
> $400.00.
>
> Speaking of Asian test gear.  This is off subject but the old timers may 
> be
> interested.
>
> For 15 years I've had a problem working at the bench.  Could go out and 
> run
> six eight minute miles.  Sit around for long and heart rhythm went
> squirrely.  Wore ECG monitors for weeks and days at a time, docs even at
> Mayo said nothing wrong.
>
> Went to ebay and bought a $150.00 ASIAN hand held ECG instrument, waited 
> for
> rhythm reoccurrence, snapped a strip and Voila case almost closed.  Fed it
> to the software which painted the the pattern before, during, and after 
> the
> malfunction.  Took it to the Bwana and he said wide eyed, it was very
> unusual for a patient to bring a diagnosis to the doc.
>
> Those Asian teen age kids sitting in a coffee shop reading comic books,
> playing kill the dragon, and designing instruments seem to be doing a 
> pretty
> good job of out performing us I would say.
>
> Kindest regards Jim
>
> -----Original Message----- From: David DiGiacomo
> Sent: Monday, January 20, 2014 10:31 AM
> To: Discussion of Electronic Test Equipment
> Subject: Re: [Test-Equipment] RF spectrum analysis
>
> On Sun, Jan 19, 2014 at 5:00 PM, Brian Burns
> <brian at lessonsinlutherie.com> wrote:
>> ~ I think you would be very happy with a Rigol DSA815-TG spectrum 
>> Analyzer
>> (brand new at $1,495).
>>
>> My favorite joke about being a guitar-maker:
>>
>> "The way to get a guitar-maker off of your front porch is to pay him for
>> the
>> pizza."
>
> Just sell one extra guitar for $4000, and you can afford a $1500
> spectrum analyzer.
>
> Anyway, Santa Rosa probably has more spectrum analyzers per capita
> than any other city.  Go to a ham club meeting there and someone will
> help you out.
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