FM Crystal Radio

[Bob Masta]

On Sun, 23 Dec 2007 20:31:05 -0500, Mike <nomtrxspam@comcast.net>
wrote:

"The scientist is possessed by the sense of universal
causation...His religious feeling takes the form of
rapturous amazement at the harmony of natural law,
which reveals the intelligence of such superiority
that, compared with it, systematic thinking and acting
of human beings is an utterly insignificant reflection."
Albert Einstein (theoretical physicist)

Lest anyone be mislead into thinking that the above
edited quote indicates that Einstein was a believer,
check out:

http://www.celebatheists.com/?title=Albert_Einstein

The full passage containing the quote is at:

http://religion.beloblog.com/archives/2007/04/religion_sneak_peek_einstein_a.html


Best regards,




Bob Masta

DAQARTA v3.50
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, FREE Signal Generator
Science with your sound card!

 

[Alice]

On Dec 22, 6:56 pm, "Dave.H" <the19...@googlemail.com> wrote:

I'm about to build an FM crystal radio, but the schematic calls for a
50 pF variable capacitor, would a 2 section 233/86 pF capacitor work,
if I only use the 86 pF section?

Radio page:http://solomonsmusic.net/FM_CrystalRadio.html

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[Rich Grise]

On Sat, 22 Dec 2007 07:52:13 -0800, Dave.H wrote:

Maybe I should just stick with AM crystal radios.

Actually, you already have one with the slope detector -
the thing is, FM broadcast is 88-108 MHz, and AM broadcast
is 530-1650 Khz, so you'd have to change your tuned circuit
to change from AM to FM, just so there'll be signals to
receive.

But go ahead and build it anyway - that's a terrific way
to learn about this kind of stuff.

Have Fun!
Rich

 

[Michael Black]

Rich Grise (rich@example.net) writes:

On Sat, 22 Dec 2007 07:52:13 -0800, Dave.H wrote:

Maybe I should just stick with AM crystal radios.

Actually, you already have one with the slope detector -
the thing is, FM broadcast is 88-108 MHz, and AM broadcast
is 530-1650 Khz, so you'd have to change your tuned circuit
to change from AM to FM, just so there'll be signals to
receive.

But go ahead and build it anyway - that's a terrific way
to learn about this kind of stuff.

Of course, there was a wave when "crystal radios" were common

for VHF. But they were specific to the aircraft band, 108 to 136MHz,
since of course that band uses AM. I remember one in Elementary Electronics
in 1971 or 72 where it built on flexible circuit board, so you could
wear it without anyone noticing. I thought that was novel, but I've
seen similar circuits in older magazines.

Michael

 

[Jonathan Kirwan]

On Mon, 24 Dec 2007 13:38:04 GMT, NoSpam@daqarta.com (Bob Masta)
wrote:

On Sun, 23 Dec 2007 20:31:05 -0500, Mike <nomtrxspam@comcast.net
wrote:

"The scientist is possessed by the sense of universal
causation...His religious feeling takes the form of
rapturous amazement at the harmony of natural law,
which reveals the intelligence of such superiority
that, compared with it, systematic thinking and acting
of human beings is an utterly insignificant reflection."
Albert Einstein (theoretical physicist)

Lest anyone be mislead into thinking that the above
edited quote indicates that Einstein was a believer,
check out:

http://www.celebatheists.com/?title=Albert_Einstein

The full passage containing the quote is at:

http://religion.beloblog.com/archives/2007/04/religion_sneak_peek_einstein_a.html

Thanks, Bob. I read the page. It gets the idea across pretty well
and accurately enough, though it is shy on quotes. Einstein had a
personal meaning for 'religious,' quite different from the use most
carry for it.

I do imagine that Einstein may have felt that the shared positive
aspects of science and of religion might be a: "free and responsible
development of the individual, so that he may place his powers freely
and gladly in the service of all mankind." And perhaps on that point
Eintein placed his hopes.

Probably the best part of one of his monologues on science and
religion is this one. I'll quote it more fully because it covers this
idea of a personal god and provides enough context to get the main
idea he was trying to discuss.

"The main source of the present-day conflicts between the
spheres of religion and of science lies in this concept
of a personal God. It is the aim of science to establish
general rules which determine the reciprocal connection
of objects and events in time and space. For these rules,
or laws of nature, absolutely general validity is required
-- not proven. It is mainly a program, and faith in the
possibility of its accomplishment in principle is only
founded on partial successes. But hardly anyone could be
found who would deny these partial successes and ascribe
them to human self-deception. The fact that on the basis
of such laws we are able to predict the temporal behavior
of phenomena in certain domains with great precision and
certainty is deeply embedded in the consciousness of the
modern man, even though he may have grasped very little
of the contents of those laws. He need only consider that
planetary courses within the solar system may be calculated
in advance with great exactitude on the basis of a limited
number of simple laws. In a similar way, though not with the
same precision, it is possible to calculate in advance the
mode of operation of an electric motor, a transmission system,
or of a wireless apparatus, even when dealing with a novel
development.

"To be sure, when the number of factors coming into play in a
phenomenological complex is too large the scientific method
in most cases fails us. One need only think of the weather,
in which case prediction even for a few days ahead is
impossible. Nevertheless no one doubts that we are confronted
with a causal connection whose causal components are in the
main known to us. Occurrences in this domain are beyond the
reach of exact prediction because of the variety of factors
in operation, not because of any lack of order in nature.

"We have penetrated far less deeply in the regularities
obtaining within the realm of living things, but deeply
enough nevertheless to sense at least the rule of fixed
necessity. One need only think of the systematic order in
heredity, and in the effect of poisons, as for instance
alcohol, on the behavior of organic beings. What is still
lacking here is a grasp of connections of profound
generality, but not a knowledge of order in itself.

"The more a man is imbued with the ordered regularity of
all events the firmer becomes his conviction that there is
no room left by the side of this ordered regularity for
causes of a different nature. For him neither the rule of
human nor the rule of divine will exist as an independent
cause of natural events. To be sure, the doctrine of a
personal God interfering with natural events could never
be refuted, in the real sense, by science, for this doctrine
can always take refuge in those domains in which scientific
knowledge has not yet been able to set foot.

"But I am persuaded that such behavior on the part of
representatives of religion would not only be unworthy but
also fatal. For a doctrine which is able to maintain itself
not in the clear light but only in the dark, will of
necessity lose its effect on mankind, with incalculable harm
to human progress. In their struggle for the ethical good,
teachers of religion must have the stature to give up the
doctrine of a personal God, that is, give up that source of
fear and hope which in the past placed such vase power in the
hands of priests. In their labors they will have to avail
themselves of those forces which are capable of cultivating
the Good, the True, and the Beautiful in humanity itself.
This is, to be sure, a more difficult but an incomparably
more worth task. After religious teachers accomplish the
refining process indicated they will surely recognize with
joy that true religion has been ennobled and made more
profound by scientific knowledge."

But to be clear, Einstein also pointed out the anthropomorphic
derivations of religious ritual and response to mystery, as well as
the overriding role science plays in improving the quality of it, in a
single sentence: ".. so it seems to me that science not only purifies
the religious impulse of the dross of its anthropomorphism but also
contributes to a religious spiritualization of our understanding of
life."

Most folks, using the word 'religion' do not often mean it the way
Einstein did -- neither by way of his earlier nor later writings. To
understand his responses and his evolution, one must actually
carefully read what he wrote and not just my quotes or anyone else's.
He writes enough, though, that most of us reading all of them will
arrive at a similar understanding. Certainly, those with much science
training, anyway. I'm an atheist, didn't read Einstein on this
subject until my own mid-life, and I find his comments completely
congruent with my own long-developed views. That doesn't make him an
atheist, but he certainly isn't 'religious' in the usual meaning.

Jon

 

[Alice]

On Dec 24, 11:42 pm, Alice <longtimetrad...@hotmail.com> wrote:

On Dec 22, 6:56 pm, "Dave.H" <the19...@googlemail.com> wrote:

I'm about to build an FM crystal radio, but the schematic calls for a
50 pF variable capacitor, would a 2 section 233/86 pF capacitor work,
if I only use the 86 pF section?

Radio page:http://solomonsmusic.net/FM_CrystalRadio.html

We can supply many name brand product in different popular designs,
sizes and colors.if you need something pleace visit our website find
it out or contact us.everything is cheap.

website:http://www.longtimetrade.com
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