Sure that is logical. OK this is good information, TNX Seems they never learn.
If you would have put it like this in the first place I wouldn´t have said anything. 73 Jim ------- On 2011-01-04 07:16, Joe Subich, W4TV wrote: > > > 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? > > It has been 18 months since I have had a FT-2000 on my bench. > When I did, I did not perform IMD testing but I did study the > schematic (Service Manual) to determine that the noise blanker > amplifier had the same unswitched design as the FT-1000 and > FT-1000MP (and MK V). > > It is insanity to assume that identical circuits that operate > one way in two (three) different models of Yaesu transceiver > will suddenly operate differently in a fourth model. > > 73, > > ... Joe, W4TV > > > On 1/4/2011 12:54 AM, Jan Erik Holm wrote: >> 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 >>>>> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
