[TenTec] Omni VI+ S meter troubleshooting
john at hodge.uk.com
Sat Nov 17 02:42:30 EST 2018
I have an Omni VI+. You could put an analogue test meter across the S meter coil. This would do 2 things: check the meter coil resistance and cause the needle to deflect.
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On 17 Nov 2018, 04:41, at 04:41, Phil Erickson <phil.erickson at gmail.com> wrote:
>I've just acquired an Omni VI+ with all the filters including the Inrad
>roofing filters. It is very sensitive as far as RF goes on all bands
>a HP 8640B signal generator as a calibrated source. However, the S
>does not work at all when AGC is enabled (or for that matter, when it
>isn't, although of course AGC should be on to generate a reading).
>I pulled the covers off and examined the IF/AF board. According to the
>manual section 4-7, the voltage driving the S meter is at connector 58
>pin one). I pulled the connector off and, using a multimeter, was able
>verify that a correct voltage was there on the pins in the ~200 to 800
>range. I was able to make that voltage go up and down as expected by
>manipulating the RF gain, and also by changing the signal generator's
>amplitude. The R25 and R29 trimmers also made the voltage move up and
>as expected ("full scale" and "offset').
>So I think the S meter driving circuitry is working fine in RX mode
>the IF/AF board..
>However, the manual is not clear on how the meter is multiplexed with
>TX section, which I haven't tried yet as I'd like to get the receiver
>first. I tried moving the meter selector knob to a few positions, but
>course all of those are for when the TX is engaged (FWD, SWR, Ic, PROC)
>it did not help.
> Does anyone have suggestions?
>1) Maybe the meter movement has failed? If so, does anyone have any
>to isolate the meter and drive it with an appropriate voltage to see if
> 2) Is there any other check to see if the meter is somehow not paying
>attention on RX because it's stuck on one of the TX meter settings?
> 3) Are there any other connectors to reseat?
>Thanks in advance -
>phil.erickson at gmail.com
>TenTec mailing list
>TenTec at contesting.com
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