[1000mp] ARRL data - 1 kHz IMD and BDR performance

Fri, 30 Jan 2004 14:24:20 +0100

Hi Bill,

I can only assume this from the following quoted statesments in QST reviews:

"Blocking dynamic range, 500-Hz IF filters at 8.2 MHz and 455 kHz:" - QST,
April 1966, FT-1000MP review Table 1.

"Blocking dynamic range, 500 Hz filter:" - QST November 2000, Mark-V
FT-1000MP review Table1.

 "Blocking dynamic range, 500 Hz filter:" - QST August 2002, Mark-V Field
FT-1000MP review Table1.

By the way, we have learned also to read between strokes here (hi).

Best regards,

73! Peter, SP5CFD

----- Original Message ----- 
From: "Bill Tippett" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Friday, January 30, 2004 13:29
Subject: Re: [1000mp] ARRL data - 1 kHz IMD and BDR performance

> SP5CFD wrote:
>  >Notice the FT-1000MP receiver has been measured by ARRL with two
cascaded
> 500Hz filters. Mark-V and Mark-V Field have been measured with only one
500
> Hz filter. It can make some difference in measurements with close spacing
> high level signals.
>
>          Peter, I just did a quick scan and it was not clear to me that
> only one 500 Hz was used in the Mark-V / Field tests.  I thought
> ARRL always bought all 500 Hz filters available for their test units.
> The following is from their test procedure document, and note the
> phrase "IF filters":
>
> "The test is conducted with the receiver in the CW mode using the
> 500 Hz, or closest available, IF filters (or audio filters where IF
filters
> are not available . For DUTs that have appropriate IF filters, all audio
> filtering is disabled.)"
>
> http://www.arrl.org/members-only/prodrev/testproc.pdf (page 38)
>
>          If you are correct, this could indeed account for some of the
> differences between the original MP and subsequent Mark V / Field
> measurements.  I'm copying KC1SX at ARRL on this note so hopefully
> Mike will clarify this issue for us.
>
>                                  73,  Bill  W4ZV
>
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