[TenTec] Omni VI Freq calibration

[Robert]

Boards are basically non-existant for this 20 year old model.   As to being "up to spec", my recall is +/- 50 Hz.  

73
Bob K4TAX


Sent from my iPhone

> On Aug 29, 2014, at 10:40 AM, Brandon Brinkley <bbrinkley at gmail.com> wrote:
> 
> Ok. I suppose if the warm up isn't an issue or if I leave the power supply on then the OCXO vs TCXO isn't a big deal. 
> 
> As for the xtal osc board, would that be a cost prohibitive fix or should I just find a replacement board provided that's the problem?
> 
> Service at TT said I should keep this for parts at a min for the VI+ since parts are scarce. 
> 
> I'll prob end up giving this to a new ham. Someone did that for me when I was young and had no funds. I just want it to be up to spec. 
> 
> I think an Omni VII is on the horizon once I get my Eagle. 
> 
> 73,
> 
> Brandon AC4OU
> 
>> On Aug 29, 2014, at 10:13 AM, "Bob McGraw - K4TAX" <RMcGraw at Blomand.net> wrote:
>> 
>> 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
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>> 
>> 
>> 
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>