[1000mp] Questions About FT-1000MP MkV

Thu, 28 Feb 2002 12:04:32 -0500

Hello Yaesu Fans.....

Much has been posted here regarding the use of  Inrad filters....I certainly
agree that for optimum QRM rejection under tough band conditions, the 1.8's
are the way to go...I had originally purchased the Yaesu 2.0's, and found
them largely ineffective, and just further degrading to the signal to noise
ratio, with poorer audio quality recovery....not very helpful in crowded
situations....

I would suggest that no matter what filters you finally settle on, that for
optimum reception, under any conditions, that the analog product detector be
employed...this demodulator produces the best signal to noise ratio, and
appears to avoid audio distortion, as opposed to the digital product
detector.....

On the Mark V, this selection is not so obvious, as it is menu selected
only.....You must select, under menu 7-7, SSb-r, only the OFF choice, not
the 100-3100, or the 300-2800, which will both engage the digital product
detector....

I find that both the IF Shift and the Width controls work more smoothly, and
more easily, and the IDBT, (digital filter tracking), seems to add some
additional selectivity, using only the OFF selection....

Further, as it has been discussed previously here,  a negative Carrier Point
Offset is also extremely helpful in improving the signal to noise
ratio....and the smoothness of the IF Shift and Width  control.....Menu 8-9
on r-UsbCar,  for example, can be set to approximately negative .160 to
accomplish this.....recovered audio will be less distorted also on stronger
signals...

During use of the narrow 1.8 filter selection, it will be found helpful to
slightly rotate the IF Shift control, towards lower audio frequency
recovery, meaning, on USB reception, turning the control slightly
counterclockwise......

With the Mark V setup in this way, you will begin to discover the advantages
of the direct mixer input, meaning engagement of the IPO, Intercept Point
Optimization (bypassing the preamplifiers), and manipulation of both the RF
and AF gain controls, to further improve signal to noise ratio, to best
recover audio from very weak stations....I also enjoy the use of the
preselector more, the VRF tuning control, with these settings......On the
minus side, you may see some need for an improved AGC circuit, when
operating in this way....I can deal with this for now.....

Finally, on 20 meters and higher, where I do most of my DXing, I utilize the
TUNED position for the preamplifiers, rather than the FLAT position.....I
have made some measurements on 10 meters only, and find that my S meter
calibration at 50 microvolts, is exact only when the Mark V is in the FLAT
position however....it reads about 5 db higher in the TUNED position, or S 9
plus 5 db, for the Collins Standard at 50 microvolts....at least with my old
Motorola test set....

The Mark V is not an appliance operator's radio, and requires some degree of
sophistication in it's use....It has taken  quite a while to learn the
techniques which work best for me,  a steep learning curve so to speak, and
the manual certainly wasn't much help in understanding all of the techniques
of weak signal recovery....

As I have been asked frequently for this information, I am pleased to share
it here.....I would welcome your input after your experimentation with these
settings.....

Happy DXing

Mike Schatzberg
WB2AJI
http://www.qsl.net/vu2wap/wb2aji/
----- Original Message -----
From: "Hans Remeeus" <[email protected]>
To: <[email protected]>
Sent: Thursday, February 28, 2002 10:49 AM
Subject: Re:[1000mp] Questions About FT-1000MP MkV

Dear Randy,

It depends on your favorite usage on the ham bands. Contesting on crowdy
bands?; then you may choose the 1,8 kHz filters from Inrad. If you like easy
talks about all kinds of things and you prefer optimal fidility, then choose
the 2,1 kHz.

In my Mark V I replaced the 2,4 Collins by the 2,8 Inrad.
I installed two 2,1 filters, three 400 Hz filters and one 250 Hz filter, all
Inrad. In the sub receiver I use a 250 Hz filter. I am very happy with this
choice! Other filtering, if necessary, is made by the DSP or my ears.

Good luck and enjoy your rig and the filters in it.

73, Hans PA1HR.

---------------------------------------
From: "WX5L" <[email protected]>
Subject: [1000mp] Questions About FT-1000MP MkV
Date: 28-02-2002 09:36:12
---------------------------------------
Hello,

I was looking for some opinions about the filtering on the Mark V.

I am unsure which SSB INRAD filter to purchase for the 455khz and 8.2 mhz
IF? Are there any out there that uses the 1.8 khz? How does that compare
with the 2.1?

On another isssue, once the filters are installed in each IF is there any
detectable loss of signal through the filtering stage.(leakage).

Thanks,
Randy
[email protected]
New Orleans, Louisiana

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