On 4 feb, 15:49, "Chris" <anonym...@noserver.com> wrote:
Yes, but my hf receiver can find no signal there. The nearest is 1.09 MHz
It is probably domestic equipment next door (Mid Terraced house), I moved
to
another room the signal vanished came back when I moved back.
Everything in the room is off.
--
Chrishttp://www.myphilosophy.eu"Wimpie" <wim...@tetech.nl> wrote in
message
news:52c242da-4c88-4581-833a-8e1118919f24@v67g2000hse.googlegroups.com...
On 2 feb, 23:11, "Chris" <anonym...@noserver.com> wrote:
I have an air core with two coils wound on it, one is 11 turns the
other
250
turns. The 11 turned coil is connected to a 1000 pF capacitor and the
250
turns connected to a 10 meg scope.
Former 3 cm square 4 cm long
There is a signal of 8 mV appearing at the terminals at 588KHz.
It is there with all electrical stuff in the house turned off.
Any one any idea what it is?
--
Chrishttp://www.myphilosophy.eu
Hello,
Can you recognize some modulation on it? Does it look like a sine
wave, also when you see about 30 periods on the display? It is
probably a local AM broadcast transmitter.
See what happens when you change the orientation of the coils. Check
the frequency with a AM receiver. Also keep in mind that when using a
digital storage scope, you may see an alias (so actual frequency is
different from what you see on the DSO).
Best regards,
Wim
PA3DJS
www.tetech.nl
Hello
When you can see it on the oscilloscope, you should hear it on a
receiver, unless your scope is lying (aliasing with digital
oscilloscope) or you don't have an antenna connected. .
With your scope, it should be possible to find more properties of the
signal. Note that when the Q factor of your coil is very high, it is
not easy to find out whether the signal is narrow band or wide band.
If possible go to your neighbours. Maybe the signal is stronger and
you can trace the source. Some months ago I had a similar problem.
The source was some circuit inside the scope itself (GWinstek GDS2200
series).
Good luck,
Wim
PA3DJS
www.tetech.nl (Dutch).
