Welcome to the FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
The latest SmartSDR Software:
SmartSDR v4.2.18 | SmartSDR v4.2.18 Release Notes
SmartSDR v3.10.15 | SmartSDR v3.10.15 Release Notes

The latest 4O3A Genius Product Software:
The latest 4O3A Genius Product Software and Firmware
How to Receive Technical Support::
If you are needing assistance with FlexRadio products, please refer to the product documentation or check the Help Center for known solutions. Need technical support from FlexRadio? It's as simple as creating a HelpDesk ticket.

PRE AMP CRAZY FLEX3000

FranciscoT
FranciscoT Member
edited May 2019 in FLEX Series (Legacy) Radios
I'm using flex3000 in amerintron als500 CW and my PRE2 dont receive good.... attn-98 off-107 pre1-119 pre2 -127 im confuseimageimage

Comments

  • Jay Nation
    Jay Nation Member ✭✭
    edited May 2019
    Francisco

    It's working as it should.

    Your measuring noise floor readings. Your highest noise floor reading was with the attenuator enabled 98dBm, your lowest reading was with preamp 2, -127dBm.
    Your noise level dropped 29dBm.
    Any actual signal would/should have remained constant.

    When Off is selected, a -102dBm signal would be 5dBm out of the noise.

    With the attenuator enabled the same signal would be buried 4dBm in the noise, you might have trouble hearing that signal at all.

    With preamp 1 enabled it would be  17dBm above the noise floor, and easier to copy.

    With preamp 2 enabled the signal would be 25dBm above the noise and even louder.

    Increased preamp gain will raise signals out of the noise, and lower the noise floor.

    Signals will appear to be taller, standing on the noise floor in the panadapter with more preamp gain.

    73, Jay - NO5J

Leave a Comment

Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.

Comment As ...

Categories