Re: [nfc-l] noise with OB21c microphone + solid state recording using AC power

[Brian Wilson]

I am guessing you are using a power supply from your junk box, not one that
came with the recorder, and that is a switcher (most of them are now) and
it's a cheap (noisy) one. Ham radio people address by either finding a
better switcher or by using a linear supply.

Batteries don't care about harmonics so if your power supply came with a
battery charger that might be the reason it's so noisy.

In your shoes, I would see if the power supply you have says Marantz on it.
If not I would call customer service and find out if they have a reasonable
cost replacement. While on the phone I'd ask what the recorder wants to see
(voltage and if it's regulated) Then if they want too much $ I would try
about a dozen other adapters looking for one with a brand name I recognize
and the voltage and current numbers I expect.

If the support person says unregulated is fine, and gives a range for input
instead of a single value (like 11.6 - 14.4 VDC for example) I'd try a
linear supply, I always have one on my bench. Sometimes linear supplies are
regulated somtimes not, you really can't tell without scoping the output.
It used to be the answer was to find a good cheap regulated linear power
supply but those are very rare now.

All this works for me because I've known the problem exists and have
squirreled away good power supplies for when it crops up.

BTW I know almost nothing about migratory birds. :-) But I love monitoring
the list.

Good luck, Brian

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Re: [nfc-l] noise with OB21c microphone + solid state recording using AC power

[Brian Wilson]

I am guessing you are using a power supply from your junk box, not one that
came with the recorder, and that is a switcher (most of them are now) and
it's a cheap (noisy) one. Ham radio people address by either finding a
better switcher or by using a linear supply.

Batteries don't care about harmonics so if your power supply came with a
battery charger that might be the reason it's so noisy.

In your shoes, I would see if the power supply you have says Marantz on it.
If not I would call customer service and find out if they have a reasonable
cost replacement. While on the phone I'd ask what the recorder wants to see
(voltage and if it's regulated) Then if they want too much $ I would try
about a dozen other adapters looking for one with a brand name I recognize
and the voltage and current numbers I expect.

If the support person says unregulated is fine, and gives a range for input
instead of a single value (like 11.6 - 14.4 VDC for example) I'd try a
linear supply, I always have one on my bench. Sometimes linear supplies are
regulated somtimes not, you really can't tell without scoping the output.
It used to be the answer was to find a good cheap regulated linear power
supply but those are very rare now.

All this works for me because I've known the problem exists and have
squirreled away good power supplies for when it crops up.

BTW I know almost nothing about migratory birds. :-) But I love monitoring
the list.

Good luck, Brian

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Re: [nfc-l] noise with OB21c microphone + solid state recording using AC power

[Christopher T. Tessaglia-Hymes]

Is the Marantz powered with a two prong AC to DC power supply, or is it also 
grounded? It might be worth trying to ground the Marantz recorder housing to 
house ground. I had a similar problem with a home stereo system and the 21c 
OldBird flowerpot mic. Grounded the stereo to house ground and the 60Hz noise 
vanished. Just a thought and worth a try...

Good luck!!

Sincerely,
Chris T-H

Sent from my iPhone



On Sep 19, 2018, at 19:14, Wim van Dam 
mailto:wim.van@gmail.com>> wrote:

[I'm not sure if this newsgroup is still alive, but here goes.]

This week I finally installed my OldBird 21c microphone and I'm having some 
noise issues. In my setting I use a Marantz solid state recorder for my 
recordings. When I power this recorder with its standard AA batteries, things 
are fine but it does not allow me to record for more than a few hours. When I 
use AC power for the recorder instead, a lot of noise shows up at 1500Hz, 
1620Hz, 1740Hz, 1860Hz, etc. Likely this has to do with the fact that the 
recorder and the OB21c microphone use the same AC outlet.

What is the best solution to this problem?

Thanks
Wim van Dam
Solvang, CA, USA
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Re: [nfc-l] noise with OB21c microphone + solid state recording using AC power

[Christopher T. Tessaglia-Hymes]

Is the Marantz powered with a two prong AC to DC power supply, or is it also 
grounded? It might be worth trying to ground the Marantz recorder housing to 
house ground. I had a similar problem with a home stereo system and the 21c 
OldBird flowerpot mic. Grounded the stereo to house ground and the 60Hz noise 
vanished. Just a thought and worth a try...

Good luck!!

Sincerely,
Chris T-H

Sent from my iPhone



On Sep 19, 2018, at 19:14, Wim van Dam 
mailto:wim.van@gmail.com>> wrote:

[I'm not sure if this newsgroup is still alive, but here goes.]

This week I finally installed my OldBird 21c microphone and I'm having some 
noise issues. In my setting I use a Marantz solid state recorder for my 
recordings. When I power this recorder with its standard AA batteries, things 
are fine but it does not allow me to record for more than a few hours. When I 
use AC power for the recorder instead, a lot of noise shows up at 1500Hz, 
1620Hz, 1740Hz, 1860Hz, etc. Likely this has to do with the fact that the 
recorder and the OB21c microphone use the same AC outlet.

What is the best solution to this problem?

Thanks
Wim van Dam
Solvang, CA, USA
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[nfc-l] noise with OB21c microphone + solid state recording using AC power

[Wim van Dam]

[I'm not sure if this newsgroup is still alive, but here goes.]

This week I finally installed my OldBird 21c microphone and I'm having some
noise issues. In my setting I use a Marantz solid state recorder for my
recordings. When I power this recorder with its standard AA batteries,
things are fine but it does not allow me to record for more than a few
hours. When I use AC power for the recorder instead, a lot of noise shows
up at 1500Hz, 1620Hz, 1740Hz, 1860Hz, etc. Likely this has to do with the
fact that the recorder and the OB21c microphone use the same AC outlet.

What is the best solution to this problem?

Thanks
Wim van Dam
Solvang, CA, USA

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[nfc-l] noise with OB21c microphone + solid state recording using AC power

[Wim van Dam]

[I'm not sure if this newsgroup is still alive, but here goes.]

This week I finally installed my OldBird 21c microphone and I'm having some
noise issues. In my setting I use a Marantz solid state recorder for my
recordings. When I power this recorder with its standard AA batteries,
things are fine but it does not allow me to record for more than a few
hours. When I use AC power for the recorder instead, a lot of noise shows
up at 1500Hz, 1620Hz, 1740Hz, 1860Hz, etc. Likely this has to do with the
fact that the recorder and the OB21c microphone use the same AC outlet.

What is the best solution to this problem?

Thanks
Wim van Dam
Solvang, CA, USA

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