Bry,
As several have already said, the INRAD filter is only necessary if you are
heavily into CW contesting.
Otherwise you will never know the difference whether it is in or out.
Here is how you get the info:
.. Go to the Inrad home page: http://www.inrad.net/home.php
.. Click on "Products by radio" in the top left (Categories)
.. Click on Ten-Tec
.. Click on Omni V, Vi& VI+
.. THIS is the OMNI VI page
Shortcut: http://www.inrad.net/home.php?cat=90
IT IS EASY TO GET CONFUSED ON THIS PAGE.
Across the top you will see 7 different filters (they differ by bandwidth).
IMPORTANT: THESE ARE *NOT* THE ROOFING FILTERS; THESE ARE JUST NORMAL
FILTERS WHICH MAY BE SUBSTITUTED FOR THE STOCK TEN-TEC FILTERS!
Now in the box outlined in light blue, you can find links to descriptions of
all of the filters, including the roofing filters.
BEFORE YOU START, CLICK ON "Omni VI Roofing Filter Mod" AND READ THIS PAGE.
DOWNLOAD THE PDF AND STUDY IT.
MAKE SURE YOU ARE COMFORTABLE PERFORMING THIS MOD.
***THIS IS NOT A PLUG-N-PLAY MOD***
This mod consists of the little printed circuit board AND your choice of
Roofing Filter.
On this page they offer the choice between 3 roofing filters:
.. #764 2.4 kHz SSB filter
.. #763 600 Hz CW filter (normal pitch, centered on 750 Hz)
.. #765 500 Hz CW filter (centered on either 9000.5 or 9000.6 kHz)
NOTE THAT THESE "ROOFING FILTERS" are only 4-pole filters.
THIS IS ENOUGH AND YOU DO NOT WANT MORE POLES;
otherwise you will have too much insertion loss.
I cannot choose a roofing filter for you.
That will depend on how you like to copy CW.
I suggest you read all of the info on that page including "A few words about
Roofing Filters" download.
I have not personally installed this mod.
There are several people in the group who have.
AFTER you have studied the stuff, you will probably have some specific
questions which one of the others will have to answer.
Hope this helps.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Brian
Carling
Sent: Thursday, February 27, 2014 1:32 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] In praise of older technology AM
transmitwithTenTecrigs
Which model number INRAD filter do I want for 600 HZ roofing in my Omni VI
Plus please ?
Sorry for my ignorance but they list so many, and I want to be sure...
Of course, I could also put the money toward saving up for a nice OMNI VII !
Best regards - Bry Carling AF4K
On Feb 26, 2014, at 4:22 PM, "Rick - DJ0IP / NJ0IP"<Rick@DJ0IP.de> wrote:
Let me put some meat behind my previous post:
Filter:.....TenTec....INRAD....INRAD
Filter:.....Stock.....600Hz....2400Hz
-------------------------------------
- 2 kHz.....79dB......94dB.....85.5dB
- 5 kHz.....82.5dB....97dB.....95.5dB
-10 kHz.....86.5dB....98dB.....96.5dB
-20 kHz.....95dB......97.5dB...97.5dB
As you see, at 2kHz spacing, the BDR3 improves by 15dB with the 600 Hz
INRAD roofing filter.
There is nothing you can do to an OM7 or IC7800 (within reason) to
come anywhere near this level of performance.
NOTHING!
The fundamental difference here is the technical difference between
upward conversion and downward conversion.
AT THIS POINT Rob always jumps in and points out that it is not
impossible with upward conversion.
Indeed the PT-8000 achieves it, but at a $17K price tag.
That's why I added the modifier, "within reason".
For those of us who work for a living, $17K is beyond reason!
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Rick
- DJ0IP / NJ0IP
Sent: Wednesday, February 26, 2014 6:38 PM
To: n4py3@earthlink.net; 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] In praise of older technology AM
transmitwithTenTecrigs
The Omni VI with the INRAD roofing filter is about 15 dB better than the
OM7
or 7800. Really no comparison.
There most certainly is a difference but you will probably only notice
it in a side-by-side comparison during a BIG contest; not in every day
life.
I don't recall Rob ever testing the VI with INRAD.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
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