The Omni VI first IF filter (9 mhz) is fixed. The second IF (6.3 mhz) is
there specifically for PBT. It shifts while the first IF does not, thereby
creating PBT.
The 7800 roofing filter is fixed no matter where the PBT is set.
I don't know anything about the FT-1000MP.
Carl Moreschi N4PY
Franklinton, NC
----- Original Message -----
From: "Bill Tippett" <btippett@alum.mit.edu>
To: <tentec@contesting.com>
Sent: Thursday, August 12, 2004 2:18 AM
Subject: [TenTec] INRAD 600Hz Orion filter arrived
> Are there any Omni VI, FT-1000MP or IC-7800
> experts out there? I am very curious to know whether
> these radios shift their roofing filter (1st IF) with PBT or
> shift only their lower IF's. From my recollection of my
> MP, "SHIFT" affects the 2nd and 3rd IF's but not the 1st.
> Omni VI may shift the 1st but I suspect not and I have
> no idea about the IC-7800. Anyone know for sure about
> these rigs?
>
> 73, Bill W4ZV
>
> P.S. The only remaining documentation I have of my MP
> is the data sheet which says "IF shift range +/- 1.12 kHz"
> and there is no block diagram.
>
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