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Re: Noise with MKU24



Hi,

I built a homebrew converter and it does exactly what you mentioned. I have
verified that it is NOT oscillationg. I think it is caused by not having the
correct load at the input. When there is nothing connected at the input, the
noise is low. As soon as I connect a connector or a cable the noise goes up
to normal levels. It almost seems like leaving the input totally open does
not leave any noise resistance to generate noise at the input. This should
be normal behavior. I wonder is someone has a better explanation.

Pieter
N4IP



----- Original Message -----
From: "Reinhard Richter" <dj1km@dj1km.de>
To: <gediminas@ameritech.ne>
Cc: <amsat-bb@AMSAT.Org>
Sent: Tuesday, December 11, 2001 6:32 AM
Subject: [amsat-bb] Noise with MKU24


>
> ===8<==============Original message text===============
> Hi,
>
> I need  help from somebody who has the same converter.
> Are other converters doing the same thing ??????
>
> I have a MKU24 downconverter.
> I set the gain when there is no antenna attached to show S1
> noise level on the S meter.
>
> When I attach the unwired N type connector (new) to the converter's input
> I'm reading an S4 noise level.
>
> Noise increases approximately by 3 S units just by attaching the bare N
type
> connector.
>
> Of course it works, I can hear stations , but I suspect I may be loosing a
> few S units because of some kind of parasitic oscilation....
>
> I'm getting the same noise increase when I connect G3RUH patch feed to the
> converter,
> this I may be able to explain....the area is noisy, but I don't understand
> why
> I'm getting such a big noise increase just by attaching a bare N type
> connector to the converter's input. And why is the noise increase the same
> in both cases?
>
> Thanks,
> Gedas (kc8ium)
> -------------------------------------------------------
> Hi Gedas,
> I've read your inquiry and have asked Michael, DB6NT if something
> is wrong with your converter. He replied that nothing is wrong. As long as
> the insput does not see a correct load it will create that noise. It's
juts
> an incorrect impedance match. So don't worry.
> 73
> Reinhard (aka René)
> DJ1KM
>
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>
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