[AMPS] Re: Re: Mission Impossible

[Tom Rauch]

> publication No. 50, ISBN 0 903 748 45 2. A 100dB SFDR requires at least a 
>   -134dBc/Hz phase noise performance to be useful. It also needs that in
> the transmitter, too!
> 
> 73
> 
> Peter G3RZP

It's even a problem on CW, where linearity doesn't matter.

There are a few FT-1000MP's on 160 meters that have synthesizer 
noise that extends out several kHz on CW. Some seem OK, some 
do not. W8LRL cured his problem by abandoning use of his MP. 
His phase noise dropped from S9 at my house (600 miles from 
Wal) to nothing at all when he changed rigs.

1000MP's also have a bit of a crackle extending out several kHz on 
SSB.

The only saving grace is it bothers the rig on receive just as much, 
if the incoming signal is strong.


73, Tom W8JI
w8ji@contesting.com

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