[TenTec] OMNI-VI question

[Robert]

I've said it before and been criticized but one needs a counter to resolve the required frequencies to 1Hz or better.  Confirming SSB USB & LSB frequency requires measurement, not listening. 


Bob, K4TAX


Sent from my iPhone

> On Oct 19, 2014, at 1:30 PM, wt4t at reagan.com wrote:
> 
> Hi Mike
> The radio is off across all modes. Think maybe its time to send it home for a checkup. I just don't have a bench thats tight enough to align what needs to be done ,as explained by some of the guys ,so far. I guess the days of Heathkit test gear except for boat anchors is over. still looking for a rebuild board for the swan supply, I found they no longer exist.
> thanks
> 73
> dale wt4t
> 
> -----Original Message-----
> From: "Mike Bryce" <prosolar at sssnet.com>
> Sent: Sunday, October 19, 2014 12:35pm
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Subject: Re: [TenTec] OMNI-VI question
> 
> DALE,
> 
> is it off on one mode or all of them?
> 
> 
> Mike, WB8VGE
> SunLight Energy Systems
> The Heathkit Shop
> http://www.theheathkitshop.com/
> J e e p
> o|||||||o 
> 
> A man with one clock knows what time it is. A man with two clocks is never sure. 
> 
> 
> 
>> On Oct 19, 2014, at 1:27 PM, Ken Brown <ken.d.brown at hawaiiantel.net> wrote:
>> 
>> Whether you can fix it yourself depends on your access to accurate instruments and your skill at using them.
>> 
>> The frequency accuracy of the Omni VI depends on the accuracy of the reference oscillator which determines the accuracy of the VFO PLL AND the BFO accuracy. The BFO in the Omni VI IS NOT LOCKED TO THE 10 MHz reference oscillator. The BFO has several adjustments for the different frequencies used for USB, LSB, CW and FSK. Those adjustment interact, so it is necessary to do them in the correct order, and them do them again.
>> 
>> You will need a way to accurately measure and adjust the 10 MHz reference and the BFO frequencies. A frequency counter with a known accurate reference would be the easiest way to go.
>> 
>> You mention having a signal generator. If that has an accurate reference you could use it and a general coverage receiver to listen to the beat between your sig gen and whichever oscillator you are adjusting. You will have to play around with methods of getting a sample of the oscillator and your signal generator at the right amplitudes to hear the beat nicely on the receiver.
>> 
>> DE N6KB
> 
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