[TenTec] Airpax circuit breaker for Orion

[Denton]

I am running both a Paragon II and Omni 6 plus. Wonder what is the most 
likely source of parasitic ocillations in these rigs?
----- Original Message ----- 
From: "Carl Moreschi" <>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, December 03, 2005 5:38 AM
Subject: Re: [TenTec] Airpax circuit breaker for Orion


> The Orion, Jupiter, Omni VI, Omni V, and Paragons also have a current
> sensing device that will reduce drive power if the collector current is
> above 22 amps.  This covers all the situations except parasitic 
> oscillation.
> Parasitic oscillation is the only reason for using a breaker in these 
> radios
> because the collector current can go very high without any drive.
>
> Carl Moreschi N4PY
> Franklinton, NC
> ----- Original Message ----- 
> From: "Robert & Linda McGraw K4TAX" <RMcGraw at Blomand.Net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Friday, December 02, 2005 11:23 PM
> Subject: Re: [TenTec] Airpax circuit breaker for Orion
>
>
>> Quoted from the Omni VI Plus manual.
>>
>> "NOTE:  When operating the transmitter into an SWR higher than 2:1, 
>> adjust
>> the RF "PWR" control to a collector (Ic) current not to exceed 20 amps as
>> indicated on the front panel meter."
>>
>> Now with that said, in looking at my Omni VI Plus operation into various
>> load conditions, I find that a 1:1 SWR and 90 watts output, the Ic 
>> current
>> is ~14 amps.  With a 100 ohm load, thus a 2:1 SWR the Ic is ~12 amps and
>> power output is 90 watts.  With a 25 ohm load, thus a 2:1 SWR the Ic is ~
> 18
>> amps and power output is still 90 watts.  The point being a 2:1 SWR does
> not
>> tell you if you have a 100 ohm load or a 25 ohm load.  In my case, if the
>> load gets down to 12 ohms the Ic is 20+ amps and power output is still 90
>> watts  On the other side of the slope with a 200 ohm load, the SWR is 4:1
>> and power output is still 90 watts bit Ic is now only 10 amps.
>>
>> Thus using a supply with unlimited current above 20 amps can be dangerous
>> unless you know your load Z and can control the power to such extent as
> not
>> to exceed 20 amps Ic.  It must be done either manually or automatically 
>> by
>> the power supply or some other fast acting current interrupt device.
>> Failure to do this will cause excessive investment in output transistors.
>>
>> 73
>> Bob, K4TAX
>>
>>
>> ----- Original Message ----- 
>> From: "Vic Klein" <vhklein at ptd.net>
>> To: <tentec at contesting.com>
>> Sent: Friday, December 02, 2005 9:48 PM
>> Subject: Re: [TenTec] Airpax circuit breaker for Orion
>>
>>
>> > Ten Tec design philosophy for radio finals is to run them full power
> into
>> > any load, rather than folding back the power as SWR increases. The only
>> > potential for damage then is if the finals draw too much current, so
> their
>> > power supplies feature a current limit that protects the transistors.
> When
>> > using another brand of supply, then, it is just a safety measure to
>> > include
>> > a fast acting breaker to do what TT supplies provide internally.
>> >
>> > =Vic=
>> > WA4THR
>>
>> --------------------------------------------------------------------------
> --
>> > ---------------------
>> > To:  "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
>> > Subject:  Re: [TenTec] Airpax circuit breaker for Orion
>> > From:  "ROBERT CARROLL" <w2wg at comcast.net>
>> > Reply-to:  Discussion of Ten-Tec Equipment <tentec at contesting.com>
>> > Date:  Fri, 2 Dec 2005 13:03:00 -0500
>> > List-post:  <mailto:tentec at contesting.com>
>> >
>> > I missed some of the earlier messages on the Orion Airpax issue.  Is 
>> > the
>> > Orion or Ten Tec rigs in general more susceptible to whatever fault
> causes
>> > the problem?  I suppose ignorance may be temporary bliss, but being in
>> > that
>> > state I have been running all my rigs from various Astron 
>> > supplies--with
>> > appropriate caution about the Astron grounds.
>> >
>> > What causes the Orion to inhale current, what specific Airpax is
>> > appropriate, and about how much do they go for?
>> >
>> > Bob W2WG
>> >
>> >
>> >
>> >
>> > _______________________________________________
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>> > TenTec at contesting.com
>> > http://lists.contesting.com/mailman/listinfo/tentec
>> >
>>
>>
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