[Test-Equipment] RF spectrum analysis

[w3sz]

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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