[ICOM] PBT versus Slope tune

[Anders Janis SM4RNA]

The impression I've got is that slope tuning is a variable hi-pass and a 
variable low pass filter. PBT is two identical bandpassfilters with variable 
center freq.

For the PBT it would mean that when the two passband filters have the same 
center freq, the filter skirts wold be 3dB steper than when they are och 
different freq. It is therefore one buy cascaded narrow filters instead of 
just adjusting the PBT to the desired bandwith.

How the Kenwood work I do not  know.

There are a bunch of people on here on the reflektor that do know, but as 
you not have gotton any awnsers so far, there is reason to belive some are 
on vacation.

de Anders SM4RNA




----- Original Message ----- 
From: "John Geiger" <johngeig at yahoo.com>
To: <kenwood at mailman.qth.net>; <icom at mailman.qth.net>
Sent: Saturday, July 22, 2006 7:28 PM
Subject: [ICOM] PBT versus Slope tune


> Is there any real difference between the slope tuning
> found in some Kenwood rigs (TS930, 940, 950, 850) and
> the twin passband tuning found in Icom rigs (746,
> 756)?  On the surface it appears that they do the same
> thing, at least for the twin pass band tuning.  I know
> in the earlier Icom rigs (737, 736 and so) the PBT
> narrowed both sides at the same time, but the twin PBT
> will only do 1 side at a time.
>
> And for those who have used both, does one method
> (slope vs PBT) work better than the other?
>
> 73s John W5TD
>
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