# Is there an easy way yo measure frequencies?

B

#### beast

Jan 1, 1970
0
Tesla didn't have an oscilloscope, so how did he figure out
frequencies?

I'm trying to make a tank circuit, but I don't have an oscilloscope.

M

#### Marko

Jan 1, 1970
0
Depending on the expected frequency, you could connect your oscillator
to an audio amplifier and listen. If you're expecting a frequency in
the range of the AM or FM band, you might be able to tune it in and
hear it when it starts up.

Back in the old days, people used a Vacumn Tube Volt Meter (VTVM)
connected to the grid of the oscillator tube. When the grid voltage
went negative (with respect to the cathode), it meant that the circuit
was oscillating. There was also something called a Grid Dip Meter
that was used for just this purpose.

Marko

On 8 Feb 2005 12:54:09 -0600,
Tesla didn't have an oscilloscope, so how did he figure out
frequencies?

I'm trying to make a tank circuit, but I don't have an oscilloscope.
*---------------------------------*
Posted at: http://www.GroupSrv.com
*---------------------------------*

J

#### Jim Douglas

Jan 1, 1970
0
My meter will measure freq from 2kHz--> 15Mhz, not very high, but maybe
there are others that go into the range you are looking for, actually my
scope only goes to 25MHZ!'

beast said:
Tesla didn't have an oscilloscope, so how did he figure out
frequencies?

I'm trying to make a tank circuit, but I don't have an oscilloscope.

C

#### ctyguy

Jan 1, 1970
0
Best and cheapest is to work with the bacic formulas using Resonancefrom ,
Resistance, inductance/inductive reactance, capacitance/capacitive
reactance.

I'm afraid to list any, since I have not used them for years, but they're
accurate (or at least as accurate as pi <g>) As in 2(pi)fl

beast said:
Tesla didn't have an oscilloscope, so how did he figure out
frequencies?

I'm trying to make a tank circuit, but I don't have an oscilloscope.

B

#### beast

Jan 1, 1970
0
How about if I use a cheap am/fm radio to tune a circuit to one
frequency, and use another cheap am/fm radio that I tune to the same
frequency, and feed the tuned signal into the antenna circuit of the
other, that would give me a cascade wouldn't it? I'm just worried
that the amplifier circuit of the other will act to dampen the
output, so I'm thinking of just using the tuning loop by itself, and
have it excited by the output of the first LCR tuning loop.

Antenna, then LCR1 output to the antenna2. I think that should work.

R

#### Robert Baer

Jan 1, 1970
0
beast said:
How about if I use a cheap am/fm radio to tune a circuit to one
frequency, and use another cheap am/fm radio that I tune to the same
frequency, and feed the tuned signal into the antenna circuit of the
other, that would give me a cascade wouldn't it? I'm just worried
that the amplifier circuit of the other will act to dampen the
output, so I'm thinking of just using the tuning loop by itself, and
have it excited by the output of the first LCR tuning loop.

Antenna, then LCR1 output to the antenna2. I think that should work.

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What makes you think that Tesla
(b) had a need or reason to measure frequencies?
(c) had anything like the FCC breathing down his back?
************
One might make use of a radio to get an approximate indication of the
frequency of an RF signal in the band(s) it can receive.
For lower frequencies, one might use a non-linear device to create
multiples of that frequency and use such a radio to derive the initial
frequency.
************
The description of that "scheme" of using two radios shows that (a)
you do not know how a radio works, and (b) you know little about
electronics, if anything.

B

#### beast

Jan 1, 1970
0
Well, thanks for the help. The two radios only provide me with already
made tank circuits. I can always separate the coil/cap from the rest
of the cicuit, and use the parts can't I?

R

#### Robert Baer

Jan 1, 1970
0
beast said:
Well, thanks for the help. The two radios only provide me with already
made tank circuits. I can always separate the coil/cap from the rest
of the cicuit, and use the parts can't I?

B

#### beast

Jan 1, 1970
0
Robert Baerwrote:
What makes you think that Tesla
(b) had a need or reason to measure frequencies?
(c) had anything like the FCC breathing down his back?
************
One might make use of a radio to get an approximate indication of the
frequency of an RF signal in the band(s) it can receive.
For lower frequencies, one might use a non-linear device to create
multiples of that frequency and use such a radio to derive the initial
frequency.
************
The description of that "scheme" of using two radios shows that (a)
you do not know how a radio works, and (b) you know little about
electronics, if anything.

....and, pray tell, *then* what?

.....?

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