[1000mp] FT1000MP Flat or Tuned?

Sat, 9 Nov 2002 10:54:54 -0500

My conclusion has been the same as yours. I use FLAT on all bands other than
10.

gary W2CS

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Ronald Walters
> Sent: Saturday, November 09, 2002 10:46 AM
> To: Yaseu Users Group; [email protected]
> Subject: [1000mp] FT1000MP Flat or Tuned?
>
>
> For several years I have read comments regarding the selection of
> the "FLAT"
> and "TUNED" preamps in the FT1000MP.  I have read were some users report
> that the tuned preamp really helped pull out the weak ones on 10 meters
> while others liked the flat for the lower bands.
>
> I've looked over the section in the manual which describes that in the
> "Tuned" mode, (page 30 of the manual) the radio will
> automatically select a
> one of three preamps in the RF section, one setup for the 24-30
> Mhz and one
> for the 1.8 to 7 Mhz with a third for the remaining frequencies.  Tuned
> would seem to indicate to this writer that a preamplifier would
> provide gain
> over a non-tuned preamplifier, however I find somewhat the opposite, that
> is:
>
> The "Tuned" amp definitely has gain in the 24-30 Mhz range, were
> the preamp
> for 1.8-7 Mhz appears to have less gain than the "Flat" preamp.  I assume
> this is a specific design feature where they are trying to improve the
> signal to noise ratio and IMD on the lower bands 160-40.  What I
> experience
> on this end is that the FLAT seems to pull the weak signals out
> of the noise
> floor especially when using the EDSP function than does the TUNED
> preamp on
> the lower bands.  The Tuned preamp appears to pull the signal out of the
> noise better on the higher bands, especially on ten meters.  I can see
> especially on ten meters a 3 to 4 S unit improvement with a 2 S
> unit gain in
> the noise floor while on the lower bands it appears around a 10
> DB decrease
> in signal strength and noise.  I  expected the opposite, that is gain
> provided by specific preamps.  My observations appear to be inline with
> various comments from other users,
>
> I am lucky that I live in an area that were I do not experience a
> high noise
> and or close stations that would cause intermod interference.
> Therefore my
> preference is using the flat preamp for all bands except the
> 24-30 Mhz range
> where I would like to use the tuned, problem, how do I set up the rig to
> accomplish this or do I need to manually select the preamp via menu 8-4
> every time I change bands?  Do I have a problem with the preamp
> on the lower
> frequencies or is what I am experiencing typical and by design?
> Any way to
> select tuned for just the higher bands?
>
> I also have the INRAD IF Amp mod installed and have made adjustments to
> setting 9-1 based on the selection of the flat preamplifier and
> assume that
> is the preferred amp to use for adjustments and utilizing the higher bands
> to compare the before and after setting.  Have it set for 10
> using the flat
> amplifier mode.  Does anyone recommend a specific preamp
> selection for this
> adjustments?
>
> Thanks for your thoughts?
>
> Ron - W4LDE
>
>
> _______________________________________________
> List Moderator: Richard Lubash N1VXW
> 1000mp mailing list
> [email protected]
> To Change Options or Unsubscribe:
> http://mailman.qth.net/mailman/listinfo/1000mp
>