[TenTec] Omni VI Freq calibration

[Bob McGraw - K4TAX]

The OCXO is the reference for all bands.  As to individual bands, there's a 
crystal {10 of them total} being one for each band.  The crystal oscillator 
is supposed to be locked to the precision reference by a PLL.  It may be 
that the PLL and varactor diode is not able to pull the crystal on 
frequency.  All of this is on the Xtal Osc. - L.O Mixer Board.

I have noted the absolute frequency will vary from band to band by a few Hz. 
And unless the BFO frequencies are not absolutely correct, you may find a 
slight frequency discrepancy from mode to mode.

73
Bob, K4TAX






----- Original Message ----- 
From: "Brandon Brinkley" <bbrinkley at gmail.com>
To: <tentec at contesting.com>
Sent: Friday, August 29, 2014 8:48 AM
Subject: [TenTec] Omni VI Freq calibration


> My Omni VI+ is spot on. I also have an Omni VI stock no Option upgrades. 
> I've noticed on 40 meters that I have to adjust 40 Hz high to be on freq. 
> I've verified that with other radios. On 10.000 I have to be on 10.000.40 
> to get the side tone to match up. On 20 meters it seems either spot on or 
> maybe 10Hz off. I've let the radio warm up 30 mins or more, so the OCXO 
> should be sufficiently warm.
>
> Any easy fix or should I look into a TCXO?
>
> 73
>
> Brandon AC4OU
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