https://www.febo.com/pipermail/time-nuts/2017-Jun/date.html
We finally got in the Panasonic thermal fuses for the HP10811 and have
a few extra. They will either plug in or solder. Contact me if you
need one.
πθ°μΩω±√·Γλ
WB0KVV
-- Forwarded message --
From: Van Horn, David
pped. But for the
> grace of G-d, the house would have burnt down. A thermal fuse in the
> transformer would have prevented several thousand dollars of damage.
> That would have paid for over a thousand thermal fuses.
>
> πθ°μΩω±√·Γλ
> WB0KVV
>
> ---- Forwarded message -
There's an excellent article out there on the web called "Low Voltage, the
incompetent ignition source" I highly recommend a read.
I dealt with a case like this a couple years ago. Failed fet in an H bridge
caused a fault which the brick SMPS picked up as a short, and went into
"hiccup" mode
Forwarded message --
From: David G. McGaw <david.g.mc...@dartmouth.edu>
Date: Wed, May 10, 2017 at 8:20 PM
Subject: Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
I too have had a fuse
11:20 PM (GMT-05:00) To:
Discussion of precise time and frequency measurement <time-nuts@febo.com>
Subject: Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
I too have had a fuse open up due to a failed thermistor in a HP10811.
David N1HAC
On 5/10/17 7:43 PM, Dan Rae wrote:
> As
I too have had a fuse open up due to a failed thermistor in a HP10811.
David N1HAC
On 5/10/17 7:43 PM, Dan Rae wrote:
As I reported the last time this subject came up, or maybe the time
before, the only time I had an open thermal fuse was in a 10811 that
had an open thermistor. I was able
kb...@n1k.org said:
> The is related to safety (full time power on). As it worked out, the fuse
> did not help them in that respect. The Fedâs still ruled the gear had to be
> shut off at night.
Could you please say more...
Does that mean unplugging gear with always-on OCXOs? Or dumping
The view from inside HP when I worked with the people
who designed and built the 10811 some 35-40 years ago
was that:
1. 10811 ovens rarely fail.
2. When they do fail, it is rarely because the oven
runs away. I know I have never encountered a runaway.
No one at HP had a "trophy" on their
As I reported the last time this subject came up, or maybe the time
before, the only time I had an open thermal fuse was in a 10811 that had
an open thermistor. I was able to replace that and get the OCXO
working, but if the fuse had been replaced with a wire link I'm sure the
entire oven
t or eBay which
> have a higher proportion of nuisance blows.
>
> πθ°μΩω±√·Γλ
> WB0KVV
>
> From: Mike Feher <mfe...@eozinc.com>
> Date: Tue, May 9, 2017 at 9:10 PM
> Subject: Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
> To: Discussion of precise time and freq
of nuisance blows.
πθ°μΩω±√·Γλ
WB0KVV
From: Mike Feher <mfe...@eozinc.com>
Date: Tue, May 9, 2017 at 9:10 PM
Subject: Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Respectfully I disagree. I have totally
-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Donald E. Pauly
Sent: Tuesday, May 09, 2017 9:49 PM
To: time-nuts; Donald E. Pauly
Subject: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
<https://www.febo.com/pipermail/time-nuts/2017-May/date.html>
https://www.fe
https://www.febo.com/pipermail/time-nuts/2017-May/date.html
I disagree about permanently jumpering the thermal fuse. The
oscillator is rated down to -55° C and the oven can maintain 82° C at
that temperature. This is a 137° C rise. It is likely capable of
more heat than that. At 25° C, it
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