My alpha 87a was purchased as a refurbished unit in 2012. It has an external
fan on the rear of the chassis, and the floating blower inside the chassis. I
had not until today realized that the fan on the back is the external fan
recommended for RTTY use - it came that way and I don’t recall pa
Bob please give us the model number of your acoustic level meter, Thanks.
Mel, K6KBE
From: "Stefan von Baltz, DL1IAO"
To: "elecraft@mailman.qth.net"
Sent: Monday, June 4, 2018 1:44 AM
Subject: Re: [Elecraft] KPA-1500 Fan Noise - measured (sort of)
Hello
FWIW - My test using the Alpha 89, was with only the built-in fan on,
not the add-on one in back (which I've never really had to use).
73,
Chris, W2PA
On 6/4/2018 4:43 AM, Stefan von Baltz, DL1IAO wrote:
Hello Bob,
Thanks for the measurements! Was this with the Alpha’s auxiliary fan on or off
Hello Bob,
Thanks for the measurements! Was this with the Alpha’s auxiliary fan on or off?
You will find this fan and its belonging switch on the amplifiers back on the
right side where the power supply transformer sits.
73,
Stefan DL1IAO, SA3CWW/SM9A
--
Stefan v. Baltz
dl1...@contesting.co
My measurements were taken with a microphone about 2 feet from the front panels
of the components. I wondered if W2PA’s alpha 89 was as quiet as he reported,
so I thought I’d report on what I found -
Ham shack in a finished (insulated drywall) room in a metal shed with equipment
and HVAC
Those numbers are pretty impressive for quiet.
Certainly quieter than a quiet dishwasher unless you really pushing it.
Mike va3mw
On Sat, Jun 2, 2018 at 11:09 PM, Bob McGraw K4TAX
wrote:
> Using a Sound Level Meter with A weighted scale, measure the noise at 1
> meter in at least 4 different
Using a Sound Level Meter with A weighted scale, measure the noise at 1
meter in at least 4 different directions. Preferably done in a "free
field" such that any acoustic reflections are at least 6 meters
distant. I know it is difficult to make measurement outside on a
piece of equipment s
2018 4:14 PM
Subject: [Elecraft] KPA-1500 Fan Noise - measured (sort of)
In an attempt to quantify this, I installed OSHA's free NIOSH app, which
measures noise, onto my iPhone 7 and tried it out. It's not a
measurement instrument, mind you, so the absolute numbers are highly
qu
In an attempt to quantify this, I installed OSHA's free NIOSH app, which
measures noise, onto my iPhone 7 and tried it out. It's not a
measurement instrument, mind you, so the absolute numbers are highly
questionable. But the relative numbers are interesting. I held the
phone at eye level be
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