>
>>>........ I guess I can run a
>>>test with voice but it just seems so subjective and would
>> be hard to show
>>>the results to anyone at the Icom factory in case I decide to send the
>>>exciter in for a tune up.
>>>
>>IMD products are pretty much fixed if the RF output unit has the
>>specified idling current.
>>>
>>cheers, Dave
>>
>>- Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
>I've come to the conclusion that ALC problems or poor design
>account for a lot of the speech related splatter that
>doesn't show up with 2 tone tests.
often true
>The TS830 seems good
>(until the driver fades) while my FT990 is horrible. As soon
>as the ALC comes into play, there is a leading edge spike of
>typically double the set power for a few ms before the level
>settles to nominal.
- which indicates that the mic. gain is set too high. On a solid state
radio, ALC indicates that overshoot is taking place. Less ALC is better
than more ALC. I run my ts440 where the ALC barely flickers. I know
that a midrange ALC indication means more feculence. If folks monitored
peak RF output voltage with an oscilloscope they would be better off.
When using an amplifier that does not use a regulated anode supply, more
mic. gain always means less PEP.
>You certainly know all about it for +/-
>20kHz when listening on a monitor rx while talking.
The only thing that matters is: how far down is the splatter?.
cheers, Steve
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|