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

Thu, 29 Jan 2004 17:42:14 -0600

Too bad the FT-1000D was not included in the tests.
Also, amazing how the original 1000MP is much better than
the newer MK V or Field models.

73, Larry AJ2W

----- Original Message ----- 
From: "Bill Tippett (by way of [email protected])" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 29, 2004 5:32 PM
Subject: [1000mp] ARRL data - 1 kHz IMD and BDR performance

>          For my own curiosity I decided to look at 1 kHz IMD and BDR
> performance using the swept graphs in ARRL's Expanded Test Reports.
> I confirmed with KC1SX who does ARRL's tests that the closest signal
> spacing was at 1 kHz in the swept IMD and BDR graphs (typically
> found around page 20 of the ETR reports).  Why 1 kHz?  Because in a
> typical contest, it is not unusual for strong interfering signals to be
> spaced at 1 kHz or even closer.  Also, it is not simply two strong
> interfering signals...many weaker ones can contribute to the problem.
>
> "Always remember actual overload is the result of the vector sum of
> signals in the passband of the system at that point. One way to look
> at it is that overload is an accumulated power problem, not an
> absolute level problem with one signal. This means a great number of
> weaker signals can cause the same problem as a few strong ones."
> http://www.w8ji.com/how_to_check_signals.htm
>
> The only exception to 1 kHz measurements below is for the
> original MP, done in 1996 before KC1SX took over ARRL's testing.
>
> Listed in order of 1 kHz IMDDR3 results:
>
> Radio                      IMDDR3                BDR
>
> TT Orion                84 dB           119 dB
> FT-1000MP*              78*                    108*
> IC-756PRO              75              104
> IC-775DSP               73              103
> TT Omni VI+                71              85
> IC-746PRO               70              92
> IC-746                         70              88
> IC-756PRO2             69              92
> FT-1000MkV              69              100
> Elecraft K2                  66              115
> TS-870                        63              87
> FT-1000Field               60              88
> JRC NRD-535              50              86
> IC-756                         50              85
>
> *FT-1000MP IMD @ 2 kHz and BDR @ ~500 Hz
>
> Source: http://www.arrl.org/members-only/prodrev/reports.html
>
>                                          73,  Bill  W4ZV
>
>
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