[TenTec] frequency adj.

[wt4t at reagan.com]

Bob
 thanks for your info. your right , I guess if it really is not broke , don't fix it. 
dale
-----Original Message-----
From: "Bob McGraw K4TAX" <rmcgraw at blomand.net>
Sent: Wednesday, October 23, 2019 4:56pm
To: "dale via TenTec" <tentec at contesting.com>
Subject: Re: [TenTec] frequency adj.



Dale:

The spec as I recall is +/- 50 Hz.  Looks as though you are well within 
that spec.  Oh by the way,   .22 Hz is ~1/4 of one Hertz. I think you 
mean 22 Hz.

You should check all bands and determine the error on each one. Each one 
has a crystal oscillator operating in a Phase Lock Loop based on the 
reference frequency.   Earlier radios had a crystal oven which required 
time to reach operating temperature.  It was not at uncommon for that 
oven to fail and there was no temperature control.   Also, if you turn 
off the DC power to the radio, you should wait about 1 hr for the oven 
to heat and stabilize.  Later radios had a TCXO which had a trimmer 
accessed through a small hole in the top of the device.  They are about 
the size of a postage stamp located on the Logic Board.   Also you will 
find that the BFO oscillators are not temperature stabilized.  Any error 
or drift due to temperature change will cause an error in absolute 
frequency.   For these reasons, the spec is +/- 50Hz.

Yes, you can correct the read-out but what frequency is the radio on?   
Remember the digital read-out is just that, and is not a frequency 
measurement.

My advice, don't tamper with it.  You'll like come away frustrated and 
maybe worse off than 22 Hz.

73

Bob, K4TAX

On 10/23/2019 3:13 PM, dale via TenTec wrote:
> Have a OMNI VI+ ,started to set up a position for the rig today and noticed the frequency readout was off about .22 hz. I remember my old omni V had a simple adjustment point to tweek the readout. Same on the + ? if so what board and location would I find it?
> The older I get the more I for get. 73
> dale wt4t
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