[Yaesu] FT1000D AGC -off behaviour

Mon, 25 Nov 2002 07:15:09 -0500

Thanks all, for enlightening me.  Dennis' explanation says it all.  I had
just opened up my 1000D to replace a transistor on the AF board and was
afraid I'd caused another problem.  Guess not!  Thanks again.
73, Darrell W4CX

| -----Original Message-----
| From: [email protected] [mailto:[email protected]]On
| Behalf Of Dennis
| Sent: Sunday, November 24, 2002 7:15 PM
| To: [email protected]
| Cc: !Yaesu
| Subject: Re: [Yaesu] FT1000D AGC -off behaviour
|
|
| Darrell..
|    Your FT-1000 is doing exactly what ANY good receiver with the AGC
| turned off will do!   A fully modulated AM signal produces power levels
| about 4 times stronger than the carrier on voice peaks.  When the
| amplitude of these peaks reaches the saturation level in the receiver
| they can go no higher and the waveform "flat tops" causing distortion.
| If the carrier itself is strong enough to saturate the receiver then the
| higher signal levels contained in modulation will produce NO further in
| increase in signal for the detector to read.  Therefore you'll hear
| almost no modulation other than the crackling caused by the carrier's
| occasional dips to sub-saturation levels during high modulation..  I can
| induce the same effect in any one of the many receivers I have here..
| 73
| Dennis,
| N�SP
|
|
| Moderator: Ray Brown, KB�STN
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