[TenTec] In praise of older technology AM transmitwithTenTecrigs

Thu Feb 27 09:29:29 EST 2014

I think the extra BDR3 for the inrad filter is best suited for 160 meter 
CW DXing where the DX station is only 2 khz away from the callers.  The 
callers 2 khz away on 160 can easily be S9+30 and the DX station may be 
only S3 or so.  That's 6X9= 54 plus 30 = 84 db right there.  But 80 db 
BDR at 2 khz is all you need 99.9% of the time.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 2/27/2014 8:52 AM, Rick - DJ0IP / NJ0IP wrote:
> 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 at 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 at 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 at contesting.com] On Behalf Of Rick
>> - DJ0IP / NJ0IP
>> Sent: Wednesday, February 26, 2014 6:38 PM
>> To: n4py3 at 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)
>>
>> man/listinfo/tentec
>>
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