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I do DX listening and every one in a while
I will actually take a portable receiver and
place it out in the back yard under a bucket.
I (Italics are stuck on again, sorry – this
computer keyboard willis messed up and I
don’t have time to try and fix this -maybe
it won’t come through on the final copy
that is submitted to the thread)
– – -So I will leave the receiver on one channel
and either attach some kind of recorder to it
for playback later or I will transmit the signal
back into the house with a Part 15 FM transmitter.
This way the receiver is away from all RFI noise in
the house. but I recently tried to use a solid state
recorder and it sends RFI from it’s microprocessor
which gets into the receiver and then is recorded
by the recorder. I put the recorder a few feet a
It way
from the receiver on the end of a long cable. This
helps a great deal but there is still some noise.
Can I use chokes, caps, whatever, to get rid of the
remaining noise?
It seems like there must be some way to do this.
That way – I could listen to an entire night of DX
the whole next day. (If I wanted to. Do I have the
time, well, not really.)
?Anyway, what to you guys think?
Brooce
Total posts : 45366Does it happen when on battery power?
A really crappy switching power supply will cause this more than a display will.
Total posts : 45366Mark I’ll try your approach.
Those are good ideas.
And Darsen the Third everything
is running on batteries.
I could be wrong but I do think a bit
of the interference is coming down the
audio cable. When I start to plug the cable
coming from the recorder into the radio audio
out, as soon as the center tip of the audio plug
hits the inside for the jack, there is suddenly
more interference.
Maybe I’ve got some chokes sitting around here
somewhere that I can put in the line.
Very best wishes to you guys.
Brooce
Total posts : 45366Cousin Broocie,
What kind of solid-state recorder are you using, and what socket are you plugged into?
Some models — like some consumer camcorders and many laptops — run +5VDC from the socket in order to power an external electret microphone, such as a gaming mic. That causes all kinds of havoc when incompatible gear is hung on it.
Only way to know for sure is to jam a plug in there that’s not connected to anything, then measure for DCV between each contact.
Total posts : 45366Thought that you were recording from the radio not direct but through the air using the mic on the recorder.
If interference happens with direct cable connection this is different….try a ferrite clamp on the audio line and wrap the cable around once. this may work..or…may not. Also keep the recorder to the side of the radio.
Mark
Total posts : 45366I am experimenting with recording
arrangements based on your suggestions.
I will let you know what happens.
Thanks again
Brooce
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