[K3] dBV display

[Julian, G4ILO]

I don't use the dBV display very often, but since I last did many firmware updates ago it seems to have developed a problem. Very often, the reading is stuck on +99.9dBV. Sometimes, rotating the VFO B knob to select a different reading, then back to dBV, gets it working. I'm in data mode with the AGC off, though I'm not sure that is always the case when this happens. Can anyone reproduce this? Perhaps it just needs a squirt of virtual WD40.

[KK7P]

Hello Julian!

> I don't use the dBV display very often...

First, you need to select AFV. Once that is stable, go to dBV and you
will then read dB relative to the AFV level.  If you go directly to dBV,
it is referenced to 0 so you get an over range.

Enjoy!

73,

Lyle KK7P

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[Julian, G4ILO]

Lyle Johnson wrote

Hello Julian!

> I don't use the dBV display very often...

First, you need to select AFV. Once that is stable, go to dBV and you
will then read dB relative to the AFV level.  If you go directly to dBV,
it is referenced to 0 so you get an over range.

Crikey, you're quick off the mark tonight Lyle! I must have been going to AFV accidentally, which was getting it going. The problem must occur when it is left in the dBV setting from the previous time the radio was used. I didn't know you had to do that. It always seemed to just work before. Thanks for the info!

[Don Wilhelm-4]

Julian,

You moved too quickly through the AFV display.
The way dBV works  - it provides the delta from the last stable AFV value.
Go to AFV and wait until the value settles down, then move to dBV and
you should see a value very close to zero if the audio is close to what
it was when you were on AFV.
Now rotate your antenna, or change antennas, or or switch between
whatever you are comparing, and you should see the variation in dB.

To be meaningful, dBV should be used with a steady signal source (unless
you want to indicated the varaition between two signals).

73,
Don W3FPR


Julian, G4ILO wrote:

> I don't use the dBV display very often, but since I last did many firmware
> updates ago it seems to have developed a problem. Very often, the reading is
> stuck on +99.9dBV. Sometimes, rotating the VFO B knob to select a different
> reading, then back to dBV, gets it working. I'm in data mode with the AGC
> off, though I'm not sure that is always the case when this happens. Can
> anyone reproduce this? Perhaps it just needs a squirt of virtual WD40.
>
> -----
> Julian, G4ILO. K2 #392  K3 #222.
> * G4ILO's Shack - http://www.g4ilo.com
> * KComm - http://www.g4ilo.com/kcomm.html
> * KTune - http://www.g4ilo.com/ktune.html
>  
>

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