[TenTec] Omni 7 shuts down on overcurrent on 10-12 meters only

[Robert Mcgraw]

Band pass filter selection is done by relays in the Omni VII.  The diodes
are serve spike or counter EMF suppressors across the relay coils.

73
Bob, K4TAX



> I would guess that if your radio is designed even close to the way my old
> Paragon is set up. You have one or more bad Diodes on the Band Pass
> Board.
> The Band Pass Board selects various values of Inductance and Capacitance
> that keep the Output of the Transmitter from outputting various harmonic
> signals. This also has a lot to do with Matching the Final Stage to your
> 50
> Ohm Load. If these various Coils and Capacitors are being Wrongly
> Selected,
> then you are looking at Massive SWR and a really bad match ( maybe even a
> short electronically ) to the Final Output Devices. Every time you change
> bands, the Microprocessor will output a certain combination of voltages
> to
> the Band Pass Board. If One or more of these diodes are shorted or open
> ..... Your radio will see a Massive Mismatch at the Finals. I would use
> the
> Diode Check function or the R times one setting on an Analog meter to
> check
> these diodes.
>                                                                          73
> and May God Bless de Wade/KJ4WS
>
> On Tue, Sep 25, 2012 at 4:00 PM, denton <denton at oregontrail.net> wrote:
>
>> I have an Omni 7 that shuts down due to over current into a flat
>> load...regardless of power output setting on 12 and 10 meters only. All
>> other bands behave themselves.
>> If I even tap the mic it will shut down...
>> Called TT about it over a year ago and they think it is either a diode
>> or
>> relay...hate to sent it in.
>> Anyone else experience the same?
>> Talked to another ham at the Spokane hamfest this last Saturday and he
>> said he had the same problem, sent it to TT for fixing but can't recall
>> just what they did.
>> ------------------------------**--------------------
>> From: "shristov" <shristov at ptt.rs>
>> Sent: Tuesday, September 25, 2012 10:44 AM
>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>> Subject: Re: [TenTec] Balancing Orion 565 VFO knobs
>>
>>
>>> Michael Cheponis <Michael at Cheponis.Com> wrote:
>>>
>>>  I have a 566, and the knobs are perfectly balanced.
>>>>
>>>
>>>
>>> It's great to know that knobs on 566 do not drift by themselves.
>>>
>>> I managed today to balance both of my 565 VFO knobs.
>>> It was easier than expected, took me 15 minutes per knob.
>>>
>>> Using an 8 mm slot drill, I cut out a ~2 mm deep hole,
>>> on the bottom of the cast balancing hole,
>>> just opposite of the fastening screw.
>>>
>>> Quantity of material removed was very similar on both knobs:
>>> approximately 100 mm^3, which is ~0.27 g of aluminium.
>>>
>>> For the record:
>>>  the knob itself is ~165 g
>>>  skirt (made of metalized plastics) is ~8 g
>>>  spring is ~1 g
>>>  rubber is ~10 g
>>>
>>> I completely ignored the skirt and the rubber
>>> as being much lighter than the main knob part.
>>>
>>> Now I can use a much lighter drag, similar to FT1000,
>>> and VFO knobs are much more pleasant to use.
>>>
>>>
>>> 73,
>>>
>>> Sinisa YT1NT, VE3EA
>>> ______________________________**_________________
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>>> TenTec at contesting.com
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>>>
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