[Yaesu] More 1000D 250 Hz filter questions

[k3ky@erols.com]

Hi, Jay-
I can't fully answer your question so far as whether you should or
should not be able to still hear the marker signal, from what you
describe- but that sounds a little suspect. In my FT-1000D, with
a 250Hz Yaesu filter in the 2nd IF and a 500Hz Yaesu in the
3rd, the rolloff is extremely sharp and the marker is completely
inaudible a few hundred Hz beyond the shoulders of the filter
passband.
If your radio is 'stock' and you have no 250Hz filter in the 3rd IF,
then your signal is passed through the minimal 2.4KHz filter.
There is indeed a simple mod to select the 500Hz filter in the
3rd IF in cascade with the 250Hz in the 2nd IF. You can do this
for about 5 cents, the cost of a single 1N914-type signal diode.
See this web page and click on the 2 items regarding the KD5VC
mod. (Important- read both before attempting the mod- the 
original description was a little confusing!)
http://www.angelfire.com/md/k3ky/page64.html
Good luck, 73, David K3KY

On 23 Nov 2001, at 2:20, Jay Kesterson wrote:

>   Installed the 250 Hz INRAD 2nd IF filter I didn't really need :-).
>   Noted 
> on both the INRAD and Yaesu 250 Hz filter that when it rolls off out
> of the passband there is still some signal detectable for 1 kHz plus
> past the filter skirt. If I turn the marker on I still hear it well
> after the filter has rolled off. Is this typical?? I don't notice this
> with the pair of 500 Hz filters so perhaps the 455 kHz filter is
> needed to take the signal all the way out??
> 
>   Seems to me there was a discussion once about the 1000 using the 3rd
>   IF 
> SSB filter when the radio has the 250 Hz position selected with no 250
> Hz 3rd IF filter installed?? And there was an easy mod to make it use
> the 500 Hz 3rd IF filter instead?? Been a long time, any details??
> 
> Thanks,
> 
> 73,  Jay  K0GU
> 
> 
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