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> On 13 Jul 2022, at 02:34, Bob kb8tq via time-nuts
> wrote:
>
> Hi
>
> The “typical” Symmetricom cone shaped GPS antennas are targeted at
> cell phone tower applications. Being mounted on the same structure
> as multiple cell transmitters puts them in a significant RF
On 7/13/22 5:24 AM, Dan Kemppainen via time-nuts wrote:
Erik,
Just a thought. The 7805 in your schematic appears to be a big part of
the signal chain. I've run into issues with 78xx series regulators
being noisy. Spent a few weeks chasing down noise issues in some
equipment and the 78xx
Erik,
Just a thought. The 7805 in your schematic appears to be a big part of
the signal chain. I've run into issues with 78xx series regulators being
noisy. Spent a few weeks chasing down noise issues in some equipment and
the 78xx regulator was a part of the problem. Replaced it with LT3042
Ed,
Thanks for the many good advice.
I've tried to incorporate as much as possible, updated schematic can be
found here: http://athome.kaashoek.com/time-nuts/PNA/SSPNA.JPG
For audio into the PC I'm using a professional balanced microphone to
USB input with a noise level of -130dBc/Hz and no
Am 2022-07-13 4:10, schrieb glenlist via time-nuts:
Oh and now LED lights overhead your bench which are driven at 5-50kHz
are are next new coupling of noise into your open bench circuits !!!
The LED ringlight on my microscope creates 57KHz noise peaks when I have
an unshielded low noise
