[TenTec] Omni VI+ S meter troubleshooting
phil.erickson at gmail.com
Sat Nov 17 06:15:43 EST 2018
Good suggestion - I'll try measuring the coil resistance. I think I
might also set up a potentiometer and a battery and try feeding some
current in to check needle deflection. (The meter doesn't seem to have a
full scale marking, alas, and Ten-Tec didn't label that on its circuit.)
Will let you know how it turns out.
On Sat, Nov 17, 2018 at 2:42 AM John Hodge <john at hodge.uk.com> wrote:
> 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.
> John G8CCD
> Sent from TypeApp
> on Lenovo Yoga Tab 3
> On 17 Nov 2018, 04:41, at 04:41, Phil Erickson <phil.erickson at gmail.com>
> >Hi all,
> >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
> >(a 2
> >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
> >needle moves?
> > 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 W1PJE
> >Phil Erickson
> >phil.erickson at gmail.com
> >TenTec mailing list
> >TenTec at contesting.com
> TenTec mailing list
> TenTec at contesting.com
phil.erickson at gmail.com
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