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@gmail.com>
To: <tentec@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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