On Feb 25, 2005, at 10:32 AM, Joe Subich, K4IK wrote:
>
> Rich writes:
>
>>
>> On Feb 24, 2005, at 12:14 PM, Dennis Sokol wrote:
>>
>>> Gary,
>>>
>>> I have a TS850 and get 120 watts out. You can adjust the power out
>>> with a simple tweak of a variable resistor. Don't know exactly which
>>> one but Burghardt set mine up that way originally and I get it on
>>> all bands.
>>
>> For turning up the power level on an 850 - or most other solid-state
>> radios, it is best to turn up the DC PS to the rated max of
>> 16 volts,.
>> (the transistors are rated at 18v) I have been running my 850 at 16v
>> for over a year and so far, so good.
>>
>
> Before turning up the output power on ANY solid state radio, please
> look up the manufacturer's specs for the PA device.
Joe -- 12 - 16v-rated radios like the TS-850 and TS-440 typically use
18v devices.
> For example,
> there are those who recommend running the FT-1000 Field at 150 Watts.
> However, the Field uses a pair of 2SC2879. The manufacturer's data
> shows a significant increase in IMD at output power > 80 watts per
> transistor (before LPF losses) ... the "sweet spot" (lowest) IMD is
> 60 watts per device which correlates very closely with 100 watts
> out of the radio. Even at rated output the Field is only good for
> about -35 dB IMD that drops to less than -30 dB when the Field is
> pushed to 150 Watts.
>
> 73,
>
> ... Joe, K4IK
>
>
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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