For Me,
When the BW and PBT are both set to NOT track both SubRX & Main RX, the
controls seem to act based without adjsuting the center of the pass band.
Thus the BW is reduced with the action of the Cut control.
Using my audio spectrum analyser ( from the PC ) I can adust the cut 'L' and
the low side of the audio spectrum starts to move, the high side stays put.
I then adjust the BW control and the high side of the audio spectrum starts
to move, the low side stays put. For me this is desirable behavior as I
have a low and high adjustment on two different controls.
There are other observations I have, some good and some not so good, It
seems that these controls act differently when they are set to 'track'.
If there was something from TT that gave extensive graphic examples of how
these should work, that might reduce much of the confusion.
73's
Rich
K5SF
From: Bob Henderson <bob@cytanet.com.cy>
Reply-To: tentec@contesting.com
To: tentec@contesting.com
Subject: [TenTec] ORION Hi/Lo Cut control
Date: Thu, 17 Jun 2004 16:11:06 +0000
I realise this topic has been aired previously but I am not sure it was
satisfactorily concluded and I am not one who will readily let sleeping
dogs lie!
For the most part I use the BW/PBT controls on my Orion. They operate both
logically and correctly, so far as I can tell. On the other hand, I find
operation of the Hi/Lo cut controls to be neither logical nor correct.
I have the following obsevations concerning operation of hi/lo cut and will
be interested to learn the views of other users..
1. Hi and Lo cut on the Orion refer to absolute frequency, which I suppose
is technically correct but this has the effect of interchanging the audible
effect of the controls when changing from USB to LSB. I feel operation
might be more logical or at least more intuitively correct if the terms
referred instead to recovered AF frequencies. In this way application of
Hi cut would always reduce the HF part of the recovered bandwidth and
likewise Lo cut would reduce the bass frequencies..
I made the following obsevations with the rig on USB. As Hi and Lo
currently relate to absolute frequency the senses would be reversed on LSB.
2. The graphical representation of Hi cut appears correct. The skirt
furthest from the carrier is adjusted whilst the skirt nearest the carrier
remains anchored. However, adjustment of Hi cut does not adjust actual i/f
b/w, until the Hi/Lo cut control is pressed and held for a second or so.
This makes no sense. Actual b/w adjustment should be immediate while
pressing and holding the control should reasonably restore the
pre-adjustment b/w.
3. The graphical representation of Lo cut is incorrect. What should be
seen, is movement of the filter skirt closest to the carrier while the
skirt away from the carrier remains anchored. The graphic shows both
skirts being adjusted but at different rates. This is not correct. The
numerical indication shows PBT shifting at twice the rate of b/w change.
This makes no sense. What should reasonably happen would be for PBT to
display a figure equal to the delta in b/w. The adjustment of the Lo cut
control does however, adjust actual b/w immediately, unlike Hi cut and
pressing and holding the control does restore the pre-adjustment b/w.
Incidentally, I have two Orions and my obsevations hold good for both of
them. They have also held good over a number of firmware releases, so this
is not a new problem.
Whatsay?
73 de Bob, 5B4AGN
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