Re: Latest Sherwood table
Posted by
Jan Erik Holm on
Jan 04, 2011; 5:54am
URL: http://elecraft.85.s1.nabble.com/Re-Latest-Sherwood-table-tp5882563p5887716.html
Yes I know all of this about the FT-1000, this was
NOT the question.
I have never heard that the NB in the 2000 is problematic.
Maybe it is maybe it isn´t, I just like to find out.
It seems you just assume it´s problematic since it uses
as you say the same circuit as in the 1000. Since you
did bring it up, is this the case or do you know something
else?
/Jim
--------------
On 2011-01-03 21:09, Joe Subich, W4TV wrote:
>
> It has been a known (documented by W8JI with fix) issue since the
> FT-1000D. The noise blanker contains a dual gate MOSFET connected
> to the IF that runs all the time. Instead of disabling the MOSFET,
> the second gate is simply biased into an "off" state when the NB
> is turned off. Unfortunately this allows the first gate to be
> overdriven by strong signals which creates IMD that is coupled
> directly back into the IF.
>
> The FT-2000 uses the same noise blanker circuit as the FT-1000,
> FT-1000D, FT-1000MP, etc.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 1/3/2011 2:31 PM, Jan Erik Holm wrote:
>> Is this a known issue with the FT-2000?
>> /SM2EKM
>> ------------
>> On 2010-12-31 23:31, Joe Subich, W4TV wrote:
>>>
>>> or issues of IMD generated in the noise blanker (even when the NB
>>> is off).
>>>
>>> 73,
>>>
>>> ... Joe, W4TV
>>>
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