[1000mp] Re: New INRAD roofing filter Kit for FT1000MP

[4x1ad]

You cannot make a comparison between results from 50kHz close-in spacing to
results at 3 or 5 kHz spacing. You need the DR results for an unmodified
1000MP.
By the way, the DR figures offered by George were take using the ARRL
method - using S-5 as reference level instead Noise floor.
George W2VJN, tested also the kit on a MP Field using Noise floor reference
(as NC0B of Sherwood Engineering).

George results:
@2 kHz  DR=87dB
@5 kHz  DR=97dB

George didn't send me the DR figures for MP Field before modification.
Anyway, NC0B DR figure for a MP Field @2kHz spacing is 60dB .
I suppose that is the DR without Noise Blanker W8JI mod which improve the
basic DR figure.
It's not correct to make a comparison between different radios with unknown
test setup. We need a complete table of results including all the data about
the radio configuration and mods and test method.
Anyway, the roofing filter should improve the dynamic range. How much ? I
don't know but I believe that at least one of this 3 gentleman (George, Bob
or Tom) will put the new figures on internet in the near future. Even only
few dBs improvement in DR will be more than welcome.

73
Morel
4X1AD


----- Original Message ----- 
From: "k3gv" <k3gv at netzero.net>
To: <1000mp at mailman.qth.net>
Sent: Thursday, July 01, 2004 3:26 PM
Subject: [1000mp] Re: New INRAD roofing filter Kit for FT1000MP


> The dynamic range listed in the specifications for my FT-1000MP indicate a
> dynamic range of
> 108 dB (@50 kHz, 500 Hz BW, RF amp off)
>
> If George is claiming a dramatic improvement  of the Dynamic Range: 97.5dB
> @3kHz spacing and 100.5dB @standard 5kHz spacing.
>
> How can I make a fair comparison when the same standards are not employed?
> 73,
>
> George K3GV
>
> DX: Long may it live !
>
> If it isn't LOGic, then it isn't LOGging
>
>
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