AMP is inverted: 0 means with 14 dB gain, 1 means 0 dB gain

[alain00091]

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(Please try the latest nightly release before submitting this. You can find the latest nightly version here: https://github.com/eried/portapack-mayhem/releases)

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Describe the bug AMP is inverted

When AMP = 0 it should be 0 dB amplification in receive mode (no gain/amplification) When AMP = 1 it should be +14 dB amplification in receive mode

and now if it is 0 it is + 14dB ....

To Reproduce Steps to reproduce the behavior:

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2. Tap on '....'

audio with good freq, see the RSSI bargraph ...

Expected behavior A clear and concise description of what you expected to happen.

Affected versions Please write any difference related with the Expected behavior, on the following versions:

• Latest Stable release:
• Latest Nightly release:
• Previous working release:

try it with 231013 bin or 1.7.4

Additional If the bug is difficult to explain, additionally to the text please include images and videos.

[gullradriel]

???

[f1ghy]

Hi, maybe have a look here: https://github.com/eried/portapack-mayhem/wiki/preamplifier-ic-replacement#rx-problems

and come back to tell us, tnx.

[gullradriel]

Ho yeah. @f1ghy is right. You may have a fried amp somewhere.

[alain00091]

YES you are right !!!, it is a HARDWARE FAILURE/BUG I checked with very old release of portapack, and also with SDRSHARP

What is amazing is that it works , I see the gain increasing if amp = 0 and decreasing if amp= 1 So the only problem is that it is INVERTED !!! I will not desolder the RF Preamplifier u13 (MGA-81563) , it is too small for my eyes Thanks a lot for your support

[Brumi-2021]

Then @alain00091 , although you did not replace it , can we close that issue?

Thanks

[alain00091]

Yes you can close it and sorry

[Brumi-2021]

No problem at all . No need any sorry . Thanks to @f1ghy and to you , for your confirmation. We hope that you could find some close friend able to help you to repair it. Cheers