Volker,
On 02/02/14 01:51, Volker Esper wrote:
Magnus,
I took an EBMPabst 624. Pabst has a good reputation.
Papst is known good brand. I have seen another brand fail miserably so
this is why I am asking.
The original fan is a Delta Electronics DFB0624 H, Dimensions are 60mm x
60mm x
On 02/02/14 03:43, Charles Steinmetz wrote:
Jarl wrote:
In my SR620 the fan is a Delta DBF0624H. It is a 60x60x25 mm fan, 24V
/0.11A.
Mine, too. Does anyone know the airflow rating of the Delta fan? It
does not appear to move as much air as it should (at least not if the
idea is to hold
Magnus wrote:
If the heat sources where well coupled to the air-flow, which they
are not, and the flow-path as low air-flow resistance, which it also
doesn't have, requires the fan to work at high rate to get any air
move, and to get the thermistor happy.
My point was, the thermistor is
On 02/02/14 18:47, Charles Steinmetz wrote:
Magnus wrote:
If the heat sources where well coupled to the air-flow, which they are
not, and the flow-path as low air-flow resistance, which it also
doesn't have, requires the fan to work at high rate to get any air
move, and to get the thermistor
Magnus wrote:
My point was, the thermistor is never happy. It always wants more
cooling. So it spins the fan up to full speed and is still too hot to
reach equlibrium.
Which only means that the thermistor setup is shifted and needs to
be adjusted to achieve the goal.
* * *
So,
Date: Sun, 2 Feb 2014 19:17:03 +0100
From: mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Subject: Re: [time-nuts] Replacement fan in SR620
On 02/02/14 18:47, Charles Steinmetz wrote:
Magnus wrote:
If the heat sources where well coupled to the air-flow, which
Magnus,
Yes, and the EBM-Papst 624 matches it well. The Papst seems to have
much lower noise from the datasheet.
There's yet another problem: the mechanical construction conducts the
fan noise to the case, so the noise is kind of amplified by the case. I
felt somewhat disappointed after
On 02/02/14 20:16, Charles Steinmetz wrote:
Magnus wrote:
My point was, the thermistor is never happy. It always wants more
cooling. So it spins the fan up to full speed and is still too hot to
reach equlibrium.
Which only means that the thermistor setup is shifted and needs to be
adjusted
On 02/02/14 20:28, Tom Knox wrote:
A little off topic but It seems many instruments (the SR620 and 53132A
included) would work best with an internal fan. (A closed system, not
exchanging outside air). Possibly with some sort of internal/external heat sink
if needed. Or in high power
On 02/02/14 20:13, Volker Esper wrote:
Magnus,
Yes, and the EBM-Papst 624 matches it well. The Papst seems to have
much lower noise from the datasheet.
There's yet another problem: the mechanical construction conducts the
fan noise to the case, so the noise is kind of amplified by the case.
Magnus wrote:
I agree. You need both, but just tossing in a stronger fan isn't
going to cut it either.
Very true. You need to attack all of the problems to fix it.
Best regards,
Charles
___
time-nuts mailing list -- time-nuts@febo.com
To
Magnus wrote:
These days I would assume that heat-pipes would be used to move heat
to a large external heat-sink. It's fairly cheap these days.
I have looked into heat pipes for several projects, and in the end
have never used them. The main problem is that almost every solution
is
Charles,
On 02/02/14 21:06, Charles Steinmetz wrote:
Magnus wrote:
I agree. You need both, but just tossing in a stronger fan isn't going
to cut it either.
Very true. You need to attack all of the problems to fix it.
Well, maybe not all of them, but there is several key areas that
Magnus wrote:
Also, the fan-noise did not change a lot by drying to damp the top
lid, so it seems the fan emits it mostly as a direct mode.
The older unit has a high hiss to its fan
That is what I have observed, as well. The noise is mostly fan blade
noise and some bearing noise coming
On 02/02/14 21:34, Charles Steinmetz wrote:
Magnus wrote:
These days I would assume that heat-pipes would be used to move heat
to a large external heat-sink. It's fairly cheap these days.
I have looked into heat pipes for several projects, and in the end have
never used them. The main
Charles,
On 02/02/14 21:58, Charles Steinmetz wrote:
Magnus wrote:
Also, the fan-noise did not change a lot by drying to damp the top
lid, so it seems the fan emits it mostly as a direct mode.
The older unit has a high hiss to its fan
That is what I have observed, as well. The noise is
on such an
otherwise exceptional produce. No offense meant to the Symmetricom engineers.
It is one of the few product I have purchased new.
Thomas Knox
Date: Sun, 2 Feb 2014 20:42:54 +0100
From: mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Subject: Re: [time-nuts] Replacement fan in SR620
Hi:
There are some radios where the internal power supply heat degrades performance. The fix is to remove the power supply
to an external box.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
___
Magnus I have a big collector of fans, mostly for Agilent equipment not that it
matters, let me know the dimensions I will see what I have that is quiet.
Cheers;
Thomas Knox
Date: Sat, 1 Feb 2014 18:56:48 +0100
From: mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Subject: [time-nuts]
Magnus,
I took an EBMPabst 624. Pabst has a good reputation.
The original fan is a Delta Electronics DFB0624 H, Dimensions are 60mm x
60mm x 25mm, DC24V 0.11A
Volker
Am 01.02.2014 18:56, schrieb Magnus Danielson:
Fellow time-nuts,
I heard the fan in one of my SR620s and it didn't really was
Jarl wrote:
In my SR620 the fan is a Delta DBF0624H. It is a 60x60x25 mm fan, 24V /0.11A.
Mine, too. Does anyone know the airflow rating of the Delta fan? It
does not appear to move as much air as it should (at least not if the
idea is to hold the interior at a fixed temperature) --
21 matches
Mail list logo
