[TenTec] frequency adj.

[Gary Follett]

I suspect you MEAN off by 0.22 KHz not 0.22 Hz? 

Is it off by the same amount on all bands?

Frequency calibration of the crystal board on an Omni VI is quite different due to the PLL used for the crystal oscillator board compared with the open loop operation of the Omni V. Alignment of frequency of this board simply involves adjustment of the reference oscillator on the logic board. It should be 20 MHz dead on.

If it’s off by the same amount on all bands, it could also be the BFO. However, this error in frequency should depend upon mode.  LSB and USB should show different errors and CW yet another. Alignment of the BFO is in the TX Audio section for the manual. There are separate trim capacitors for each mode.

It is quite common for the trimmer caps in the BFO to become “dirty” just like a potentiometer or switch can get “dirty”. Cleaning is a simple matter of lightly spraying with non-residue contact cleaner, rotate full range several times, let dry overnight at least, then calibrate the BFO trimmers.

Sometimes you can get lucky and clean the trimmers by dry operating through full range several times without the cleaner. Then you can calibrate immediately since there would be no trapped solvent to evaporate out of crannies.


Gary

W0DVN


> On Oct 23, 2019, at 3:13 PM, dale via TenTec <tentec at contesting.com> wrote:
> 
> 
> Have a OMNI VI+ ,started to set up a position for the rig today and noticed the frequency  readout was off about .22 hz. I remember my old  omni V  had a simple adjustment point to tweek the readout. Same on the + ? if so what board and location would I find it?
> The older I get  the more I for get. 73
> dale wt4t
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