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
___
tim
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] Replac
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 mos
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 proble
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 dir
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
togeth
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 customiz
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
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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. I
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 situation
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
adjuste
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 repla
> 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
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,
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 ha
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 neve
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 th
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 25mm,
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) -- every
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 w
bject: [time-nuts] Replacement fan in SR620
>
> Fellow time-nuts,
>
> I heard the fan in one of my SR620s and it didn't really was a nice
> sound. Has someone found a good replacement fan? Quieter would be nice.
>
> Considering performance checks and calibrati
Fellow time-nuts,
I heard the fan in one of my SR620s and it didn't really was a nice
sound. Has someone found a good replacement fan? Quieter would be nice.
Considering performance checks and calibration this evening.
Cheers,
Magnus
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