Sorry, I disagree, as the ability of the Orion
platform to switch in the 1.8 verses ~3.0 of
the FT5K, would ADD value to the overall chain.
The narrower 1.8 would reduce even more of the
other non-desired strong signals off frequency
that the 3.0 of the FT5K could do nothing about.
That is/was Wayne's key question below, and is
not an option offered by the FT5K, agree?
73 de Billy, AA4NU
-----Original Message-----
>From: Bob McGraw - K4TAX <RMcGraw@Blomand.net>
>Sent: Jan 31, 2013 10:48 PM
>To: Billy Cox <aa4nu@ix.netcom.com>, Discussion of Ten-Tec Equipment
><tentec@contesting.com>
>Subject: Re: [TenTec] Yaesu comparison
>
>The operative description was "SSB selectivity". The roofing filter has
>little to do with that aspect in as much as it only protects the IF portion
>which is outside of the DSP BW value. Therefore the roofing filter
>bandwidth value is always equal to or greater than the DSP BW value.
>
>Yes the roofing filter does keep strong signals which are outside of the DSP
>BW from captureing the AGC and thus reducing the gain within the DSP BW but
>I don't view the roofing filter as having direct impact on SSB selectivity.
>
>73
>Bob, K4TAX
>
>
>----- Original Message -----
>From: "Billy Cox" <aa4nu@ix.netcom.com>
>To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>Sent: Wednesday, January 30, 2013 11:49 AM
>Subject: Re: [TenTec] Yaesu comparison
>
>
>> Bob,
>>
>> I believe you are discounting how well the "roofing
>> filter" really protects the actual "IF" chain?
>>
>> Given today's platforms, the line is rather blurred
>> as many would consider the "roofing filter" as being
>> part of the IF chain too.
>>
>> Not nearly as easy to define as in years past as to
>> either the DSP or the "roofing filters".
>>
>> Not so long ago, DSP was still primarily audio, not IF.
>>
>> The DSP systems we have today are excellent, but tend
>> to still need an additional filter placed ahead in the
>> system to prevent overload and other challenges.
>>
>> Rather interesting to see how Yaesu copied the K3,
>> which followed the Orion platform, after the failure
>> of their FT2000 platform with it's RX weaknesses.
>>
>> Of course Rob Sherwood needs to be remembered for his
>> work with the Drake platforms that started all of this!
>>
>> 73 de Billy, AA4NU
>>
>>
>> -----Original Message-----
>>>From: Bob McGraw - K4TAX <RMcGraw@Blomand.net>
>>>Sent: Jan 29, 2013 12:06 PM
>>>To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
>>>Subject: Re: [TenTec] Yaesu comparison
>>>
>>>First I'd say that a roofing filter has little to do with actual receiver
>>>IF
>>>selectivity. In other words, the roofing filter is pre the DSP
>>>selectivity
>>>which would typically be less than the BW of the roofing filter. Today's
>>>receivers develop their selectivity in the DSP system.
>>>
>>>In the referenced video, I could not discern the DSP selectivity of the K3
>>>or the FT-5000. The Orion II BW is 520 Hz.
>>>
>>>
>>>73
>>>Bob, K4TAX
>>>
>>>
>>>DISCLOSURE:
>>>This is to inform all persons, I am a Tentec Ambassador and I receive
>>>compensation according to the Tentec Ambassador program. In addition, I
>>>serve as a volunteer beta test person to Tentec for the Omni VII, Eagle
>>>and
>>>Argonaut VI radios. I hold no employment relationship, no financial
>>>interests nor do I conduct any commercial business, direct or indirect,
>>>with
>>>Tentec.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>----- Original Message -----
>>>From: "Dan Thompson" <w4uh@bellsouth.net>
>>>To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
>>>Sent: Monday, January 28, 2013 3:05 PM
>>>Subject: Re: [TenTec] Yaesu comparison
>>>
>>>
>>>> Here is a You Tube comparing the K3, Orion II, & FT5000.
>>>> http://www.youtube.com/watch?v=8SqVBkA535o
>>>>
>>>> 73, Dan W4UH
>>>>
>>>> -----Original Message-----
>>>> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
>>>> k4elo@fastmail.fm
>>>> Sent: Sunday, January 27, 2013 6:47 PM
>>>> To: tentec@contesting.com
>>>> Subject: [TenTec] Yaesu comparison
>>>>
>>>> Has anyone on the list had the chance to do an A/B comparison between
>>>> the Orion II and the Yaesu FTdx5000? Particularly in terms of ssb
>>>> selectivity.
>>>>
>>>> I used to have an Orion II and sold it (bad move!), but now much later,
>>>> have a Yaesu FTdx5000, but I am not satisfied with it's selectivity,
>>>> maybe due to only a 3 kHz roofing filter. So I am seriously thinking of
>>>> going back to the Orion with a 1.8 roofing filter.
>>>>
>>>> Any comments?
>>>>
>>>> Thanks and 73
>>>> Wayne
>>>> K4ELO
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>>
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>>>
>>>
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