[TenTec] ORION Hi/Lo Cut control

[Richard Detweiler]

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 at cytanet.com.cy>
>Reply-To: tentec at contesting.com
>To: tentec at 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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