Hi Tom,
>
>The fact of the matter, however, is I actually measured the internal
>performance stage by stage in my FT-1000.
I misunderstood your first post on it. Upon reading your second post
(after mine), I realized you were talking problems specific to the
FT-1000 not problems in general.
By the way, which model? Plain, D, or MP?
>
> Finally, my point got lost in reflector IMD. I never said mixers in
>theory were non-problems. My point was simply that mixers (or
>other cycle by cycle non-linear devices) are not always the weak
>link nor do they often set the IMD limits in our equipment. There
>are countless examples where they are not problems, especially in
>amateur equipment.
>
OK, I think we agree!
By the way, I know that Yaesu has some IM fixes that were implemented
into the original FT1000/FT1000D radios. I know this for a fact cause
when I bought mine used last summer, I sent it in to Yaesu to have these
upgrades performed (which they did for free). I am tremendously
impressed with the quality of the receiver in my FT-1000D and I fail to
see what people complain about. Maybe it's because I haven't heard a
"better" RX. I did upgrade from an FT-840 which would have IM generated
when someone sneezed on a frequency several KCs away. So perhaps I don't
have a lot to compare to. But from what I can tell, it sure works well.
>> It doesn't. And also if mixers can't be over-driven easily (as Tom
>> suggests) then why do they include additional fron end attenuation levels
>> on rigs like the FT-1000D?
>The fact the receiver has an attenuator that replaces the preamp
>means nothing, except what we assume it to mean in our own
>minds. None of use were privy to the decision why an attenuator
>was included, and it certainly would or could reduce overload of any
>stage from the preamp to the audio output, be there for
>convenience, marketing, or any other reason or reasons. It could
>be there simply because Kenwood has one. We have no idea.
Agreed, we end up guessing as to the real reason, but suffice to say that
it helps a lot, particularly in strong signal environments. In contests
while trying to copy a station and getting killed, by some other strong
ones, I've been able to crank up the attenuation. The overload stops and
while the station's signal isn't as big on the S-meter, I can hear them a
lot better w/o all the other craps. So my belief is that there is a
legitimate and useful purpose to the attenuator.
Interested in feedback on which FT1000 you have and any comments on
Yaesu's mods.
73,
Jon
KE9NA
--------------------------------------------------------------------------
The Second Amendment is NOT about duck hunting!
Jon Ogden
jono@enteract.com
www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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