John, I wouldn't know (last time I looked, Inrad didn't make filters for
the O II (O II filters are not the same as those for the 565), but that might
have changed). In any case, the problem is not the T-T filter itself, but
simply that if you set the DSP BW to something higher than 2.4 kHz (but
less than 6.0), the 6 kHz roofing filter is selected. So, in a heavy QRM
situation like Jack's, the DSP BW should be set to 2.4 kHz or less, even 1.8
if necessary.
73 Ray W2RS
In a message dated 11/22/2010 6:33:15 P.M. GMT Standard Time,
cdistflatfoot@gmail.com writes:
should I look to INRAD ? John kb2huk
On 11/22/2010 1:10 PM, Rsoifer@aol.com wrote:
> Jack,
>
> I'm not sure these are the best settings either, but here's what I do.
To
> me, AGC Slope works best at 1:10 so I leave it there. On SSB, my front
> panel AGC button is set to Prog, which translates to Hang 0, Decay 10
dB/s
> and Threshold 1.00 uV. On the Filtr menu, all of the optional roofing
> filters (I have them all too) are enabled and Xtal filter is set to
Auto. With
> the DSP filter set to 2750, that would auto-select the 6 kHz roofing
filter,
> which may be your problem. If you set the DSP filter to 2400, that
should
> auto-select the 2.4 kHz roofing filter instead.
>
> I generally use the 6 kHz roofing filter for 160-meter CW (tnx, Bob
K8IA,
> for that tip) but 2.4 kHz for SSB.
>
> Hope this helps.
>
> 73 Ray
>
>
> In a message dated 11/22/2010 5:52:19 P.M. GMT Standard Time,
> Thomas.Emerson.Jr@morganstanleysmithbarney.com writes:
>
>
>
> Hey Ray,
> Not sure how well this is going to work. I'm at work now, just checking
> for replies via the archives on this work station.
> OK, here's your answers. I have all the filters installed. It does not
do
> it on cw. It mostly occurs on 75m, at night, when lots of strong
signals
> and QRM are around. And it's not like it's happening constantly, just
> occasional popping in the audio, if very strong signals are on frequency
or nearby.
> I usually keep the filter on ssb set at 2750 hz. I'm thinking maybe I
need
> to cut it below 2400, and let that roofing filter kick in. Will try it
> tonight.
> And the hardware nb is off. Using nr helps, and moving the agc slope
from
> flat to one of the other 2 settings eliminates it. But I prefer to keep
> agc slope at the flat setting, so I'm hoping someone else has
experienced
> this and found a solution other than the agc slope adjustment.
> I would think that adjusting the agc menu settings (decay, hang,
> threshold) would do it, but I haven't found the right combo yet.
> Jack W4TJE
>
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