[TenTec] PLEASE, no more arguing about off-topic posts!!! Now a Tentec question!

[k8do]

Plastic hose filled with salt water?

Denny

----- Original Message -----
From: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@ames.net>
To: "Stuart Rohre" <rohre@arlut.utexas.edu>
Cc: <agtaylor@llnl.gov>; <tentec@contesting.com>
Sent: Wednesday, January 31, 2001 8:59 PM
Subject: Re: [TenTec] PLEASE, no more arguing about off-topic posts!!! Now a
Tentec question!


>
> The power output of a solid state final drops quite a bit when the
> supply drops from 13.8 to 12 volts. Typically Vsat on the PA transistor
> is a couple volts, so the swing is limited to supply - 2 volts. The
> output load line is fixed by the output network so power output is
> proportional to the square of the voltage swing. 13.8 -2 is 11.8 volts
> peak swing. 12-2 is 10 volts. The ratio of their squares shows that a PA
> can only put out 71.8% at 12 volts than it put out at 13.8 volts. At 10
> volts that same PA can only put out 46% of the power it did at 13.8
> volts.
>
> Some Scouts seem to have problems with voltage drop in the leads and
> power connector to lead to voltage regulation problems when the voltage
> drops below the required input voltage for regulation. The best of
> voltage regulators require less than half a volt drop to maintain
> regulation, while the more common 7800 series require more like 2.5
> volts drop for regulation.
>
> The voltage regulator on the control board in the Corsair II puts out
> 8.2 volts. Looks like the absolute minimum supply has to be more than 3
> silicon junctions higher, probably more so at least 10 volts to remain
> regulated. The manual specifies power required 12 - 14 volts. 850 ma
> receive 18.5 amps transmit.
>
> Now I have a question. How is it possible to communicate with any Tentec
> radio without antenna and feed line?
>
> 73, Jerry, K0CQ
>
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>


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