Now to the negative part , noise floor from around 21MHz to well over 500MHz
raised to a signal strength 5 to 6 across mid to upper HF / lower VHF to
upper UHF with them switched on, otherwise my noise floor is Zero.
Lower VHF to UHF SSB/FM low level signal work is now not possible when
Your mention of bridges Chris reminds me that the British Post Office developed
quartz oscillators in the early 1940s that used filament lamps for amplitude
stabilisation in a bridge circuit. Stabilities of ±1 part in 10 to the 8th were
achieved.
John H.
On 12 Oct 2011, at 06:00, Chris
A friend of mine runs a compliance lab locally, many LED products in the flow
these days.
He has tested some random samples purchased at walmart and such, and his
comment was No way in HELL would these pass.
Might be time for some consumer action.
I now have my house converted over completely to LED bulbs... over 300 of them
(mostly PAR16/PAR20/PAR30/PAR38 bulbs)! At retail the cost would have been
over $15,000 dollars!!! Totally insane... I have a large closet totally
dedicated to light bulbs.When incandecents/halogens are no
Incandescent light bulbs are very useful.
They are a high dissipation resistor with a lot of uses.
I have one in series with a bathroom ceiling fan, just kept plugging
smaller watt values in
until the fan was quiet enough but still fully functional.
I have one in series with a micro drill
On Tue, Oct 11, 2011 at 3:23 PM, Neville Michie namic...@gmail.com wrote:
Incandescent light bulbs are very useful...
...It will be a pity to see them turn to unobtainium.
There is no plan for them to go away (at least in California), halogen
bulbs meet the new energy standards.
--
Chris
My Lava Lamps will be ok, if I can still get resistors. :)
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This thread is wonderful, nostalgic, technical, futuristic, and
appropriate for someone's list. But not time-nuts. Please stop
it now. Don't reply.
/tvb
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Incandescent lamps also have the property of a cold resistance very much lower
than that at design voltage. Used in series with drills and bathroom fans this
gives a useful current surge at switch-on.
And the [time-nuts] connection? I use a torch bulb in series with the drive to
a dry cell
Mmmm but halogens dont have a lot of life run at below the rated spec !
Alan G3NYK
- Original Message -
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, October 11, 2011 11:29 PM
Subject: Re:
There is one angle that was not covered, but which is relevant (at least to
those of us using any LF or HF time receivers).
Over the weekend I bought my first LED bulb. It was on sale and I wanted to see
how it worked. On the package it gave a warning that it could interfere with HF
Sorry Tom, (again!),
Just as significant is the radiation from compact fluorescent lamps, many
radiate strongly in the 50-60KHz region from their SMPSs. This has been the
reason for failure of several clocks I am aware of that are tuned to radiocode
transmissions on 60KHz.
John H.
On 12 Oct
Another connection from Time Nuts to incandescent light bulbs is the early
HP Wien bridge oscillators. They used the light bulb for amplitude
stabilization. This light bulb stabilized oscillator is what put the HP
company on the map.
There was a time when these oscillators where the best
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