Jerry
???? the brain isn't functioning fully today,I guess. Iam confused about the
use of the? BPF/FADE control. This control....or controls.... take a full? flat
audio signal and makes? it able to cut the audio pass band from flat to 220 to
1700 by a combination of the 2 pots? If this curcuit was not working like it
should would this not result maybe in the tinny audio Iam getting? the fade
does cause some action to the audio,? past mid scale with the fade knob,
results in 0 audio in usb,never used it in lsb. the BPF seems to have NO effect
on the audio signal.
dale
-----Original Message-----
From: Dr. Gerald N. Johnson <geraldj@storm.weather.net>
To: tentec@contesting.com
Sent: Sat, 28 Mar 2009 2:27 pm
Subject: Re: [TenTec] poor harsh audio on OMNI-V
On Sat, 2009-03-28 at 15:06 -0400, yash@aol.com wrote:
> Jerry
> ?the bpt seems to work as it should,varies the signal as it should ,except
> the
signal STARTS off as the poor audio signal. I did notice the BPF and the fade
controls do next to nothing for the audio the fade is ok ,but the BFP does
nothing.... I noticed the BFP does cut the audio width from 200 to 1700 while
it
is in use, per the manual.? possible the circuit is not dropping out somehow?
this seems to me the 200 to 1700? would have the no bass, tinny sound I am
hearing. Ive never had a rig with a BFP before ,maybe my understanding of its
use is not correct?
> dale wt4t
>
>
>
>
>
The effect of the bandpass tuning depends on what filters are in use at
9 and 6.3 MHz. If the filters are of comparable bandwidths, moving band
pass tuning off of zero narrows the receiver bandwidth. One filter sets
the high side, the other filter sets the low side. Practice on a carrier
to see the effects, tuning past the carrier as a manual spectrum
analyzer (though a computer sound card based audio spectrum analyzer
works with noise a the signal source just fine, even a PSK-31 waterfall
works for that).
If the 6.3 filter is narrower than the 9 MHz filter then it will set the
receiver bandpass and one that is moved over the spectrum passed by the
9 MHz filter until it gets to the edges. Then depending on the direction
of offset one filter sets the high side and the other sets the low side.
Again a manual sweep past a carrier or a computer audio spectrum
analyzer can be very handy tools towards visualization of the results.
73, Jerry, K0CQ
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