[TenTec] Paragon II Failure to Transmit

[Bob McGraw - K4TAX]

While in full and total agreement, I do admire and highly respect and more 
so do appreciate the efforts of Rob Sherwood.  His data on receivers is 
basically "unchallenged" in today's receiver performance market.  At the 
same time, I would point out that there are other significant factors 
relating to receiver performance other than the 2 KHz dynamic range.  He 
presents this information based on this single factor.  I suggest one 
download the data to an Excel Spreadsheet thus allowing one to sort on 
different parameters.  It's enlightening to say the least.

I do recall a comment and I hope I paraphrase Rob correctly; a dynamic range 
of 80 dB or greater is likely not to be noticed by most hams in most 
applications and operating instances.  Only the most intense contest 
operation with multiple stations on the air simultaneously would likely 
benefit noticeably from the added performance.

His presentations to the various radio clubs and the Dayton Hamvention are 
very informative and equally easy to understand.

73
Bob, K4TAX




----- Original Message ----- 
From: "GARY HUBER" <glhuber at msn.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Sunday, January 20, 2013 5:00 PM
Subject: Re: [TenTec] Paragon II Failure to Transmit


> Rob Sherwood explains in 
> http://www.sherweng.com/audio/Sherwood_CU_2008_final_b.wmv  What dynamic 
> range is possible and needed for CW? 80 dB or better @ 2 kHz including the 
> 2007 Ten-Tec Omni-VII: 80 dB
>
> Pete, I do not want to offend you, but I suggest you review the Rob 
> Sherwood presentation. I think you may have missed something regarding the 
> 70 MHz IF 20 kHz filter's role and that of the 500 Hz filter in the 2nd 
> IF.  The graphics and audio by an engineer are much better than any 
> attempt by me.
>
>
> 73 ES DX,
> Gary -- AB9M
>
> -----Original Message----- 
> From: Peter Bertini
> Sent: Saturday, January 19, 2013 6:37 PM
> To: TenTec at contesting.com
> Subject: Re: [TenTec] Paragon II Failure to Transmit
>
> I may be missing something, but I don't see how the 455kHz mechanical
> filters can do much to improve the 2nd mixer in band IMD performance for
> the Omni VII. The limiting factor is the 70 MHz 1st IF filter which has a
> wide 20 kHz BW. It looks to me the same problem when comparing in close CW
> performance between my Omni VI and Paragon II. The Paragon has the same 70
> MHz 1st IF problem and lack of early protection for the second mixer.
> (Besides the phase noise issues).
>
> Pete k1zjh
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