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
Respectfully I disagree. I have totally shorted out numerous oscillator’s fuses
with no problems. The design of those thermal fuses makes them vulnerable to
opening just due to years of use without problem, in any of the electronics. My
shorted out oscillators still work. Ideally, if handy, it
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