[TenTec] TCXO Omni VI

[Dukes HiFi]

The TCXO is not really a benefit for the Omni 5.

The Omni 5 uses a free-running crystal oscillator for the LO mixing with the digital 5.0 to 5.5 MHz VFO to produce the first mixer premix. As such, the operating frequency of the Omni 5 can, and often does,  differ by a few KHz from the displayed frequency, and that difference is generally band-dependent.

The Omni 6 uses a simple PLL to lock the crystal oscillators to the precision reference so that, at least in theory, the transmitted and received frequency is exactly correct as shown on the display. This feature required that the reference oscillator be dead on so thus the interest in a TCXO to replace the original oven stabilized reference in early Omni 6 radios. Those early oven stabilized oscillators were only “dead on” after the ovens warmed  up and stabilized. When the ovens inevitably failed, the reference was always off.

The reference oscillator in the Omni 5 is only used by the 5.0 to 5.5 MHz VFO and by the CPU. Thus the crystal oscillators will not be corrected by addition of the TCXO.

Gary

PS: Now you know why I am not on Twitter. 140 characters is NOT sufficient for me!



> On Nov 16, 2017, at 1:26 PM, wes Bolin <k5apl41 at gmail.com> wrote:
> 
> Hi  Gary
> I have an Omni V.  Would the TCXO work with it?  Is it necessary for the Omni V?
> Thanks
> Wes