The DX-440/ATS-803 are dual conversion. Also, the Sony 2010 is
dual conversion. All exhibit the 455 kHz birdie syndrome though!
It can be a definite PITA!
--- In ultralightdx@..., "d4g7johnson" wrote:
> I thought it was common for <$1000 radios to use 455KHZ
> I.F. (even if they are dual conversion and have another
> higher I.F. frequency). Then if there is I.F. leakage
> back into the RF input stage you will get oscillation
> at about 455KHZ. The Radio Shack DX-440 is an prime
> example of this, made worse by being single-conversion.
> I don't have a PL-600 to compare, but it sounds like the
> exact same problem.
> --- In ultralightdx@..., "Lasse No" wrote:
> > I just got a PL-600 and while tuning it on the LW band I came across a severe birdie between 450-460 kHz. Is this what to expect from a cheap chineze radio? I'm not too happy with my radio, so I wonder if it could be one of those that QC missed...
> > I have a video that shows this: http://www.youtube.com/watch?v=q_23b2oyujE&feature=plcp
> > Regards
> > Lasse