Tim, Willi,
I have had a lot of problems with a fancontroler oscilating wildly,
covering the FMbroadcast, Airband and the lower TV channels
with a collectormotor like noise. Swapping the contoler solved
the problem.
73 peter pa0pvn
-----Oorspronkelijk bericht-----
Van: [EMAIL PROTECTED] namens Tim Ellison
Verzonden: do 25-5-2006 19:21
Aan: Willi Reppel; Bill Nagle; FlexRadio@flex-radio.biz
CC:
Onderwerp: Re: [Flexradio] noisy fan
Oh. I see. I will check to see if the fan controller I am using
provides any noise electronic filtering
-Tim
---
Integrated Technical Services
"Whoa-oh, Smokestack Lightning, shining just like gold.
Why can't you hear me crying.
Whoa-oh, stop your train, let a hobo ride.
Why can't you hear me crying. "
--Howling Wolf
-----Original Message-----
From: Willi Reppel [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 25, 2006 11:47 AM
To: Tim Ellison; Bill Nagle; FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] noisy fan
Tim,
Thanks again for your suggestion which I carried out a long time ago.
It remains to do something about the electrical noise of the fan. I see
20 dBm of noise spred out over the lower sideband in the 15 m band which
disappears when disconnecting the fan. While the purist argue about 1/f
noise and freezing of the SDR-1000 to 0 K to reduce thermic noise, I am
looking for a engi-neering change order (ECO) to get rid of the more
substantial electric fan noise.
Best 73
Willi
----- Original Message -----
From: "Tim Ellison" <[EMAIL PROTECTED]>
To: "Willi Reppel" <[EMAIL PROTECTED]>; "Bill Nagle" <[EMAIL
PROTECTED]>;
<FlexRadio@flex-radio.biz>
Sent: Tuesday, May 23, 2006 8:50 PM
Subject: RE: [Flexradio] noisy fan
Yep, That was me who reported it. There is a little too much back
pressure generated between the fan and the vents. You can trace a nice
octagon around the air intake holes by drawing tangents on the existing
holes.
5 minutes with a Dremel tool and a cutting wheel and you are in
business.
-Tim
---
Integrated Technical Services
"Whoa-oh, Smokestack Lightning, shining just like gold.
Why can't you hear me crying.
Whoa-oh, stop your train, let a hobo ride.
Why can't you hear me crying. "
--Howling Wolf
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Willi Reppel
Sent: Tuesday, May 23, 2006 2:34 PM
To: Bill Nagle; FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] noisy fan
Bill,
Many months ago somebody suggested on the forum to make a large opening
in the cabinet wall behind the fan instead of letting the cooling air
pass through many small holes. The OM reported a sub-stantial noise
reduction and mentioned that the small holes in the cabinet together
with the adjacent fanwheel create a whining sound like a siren .
Willi
----- Original Message -----
From: "Bill Nagle" <[EMAIL PROTECTED]>
To: <FlexRadio@flex-radio.biz>
Sent: Tuesday, May 23, 2006 6:14 PM
Subject: [Flexradio] noisy fan
> Does anyone have a suggestion as to quiet the fan noise on the
sdr1000?
> Perhaps slowing it down a bit with a series resistor?
>
>
> Bill Nagle
>
>
>
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>
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