[TenTec] Omni 6 sensitivity

[denton]

Wonder how an Omni VI compares to a Corasir II in similar circumstances? 
thanks de Denton WB7TDG
----- Original Message ----- 
From: "WF2U" <wf2u at starband.net>
To: <tentec at contesting.com>
Sent: Sunday, December 19, 2004 6:37 AM
Subject: RE: [TenTec] Omni 6 sensitivity


>I recently got rid of an Icom 756 in favor of the Omni VI Opt.3.
> Side-by-side comparison showed that the Omni VI has a definite edge in
> weak-signal reception. The difference may be attributable to lower phase
> noise in the Omni VI. The 756 DSP wasn't up to snuff clarifying mushy, 
> noisy
> signals. The Omni VI DSP seems to work better. The IC-756 could never hear
> weak signals in the "holes" in between strong stations, where the Omni VI
> picks up some nice activity.
>
> The PBT is different - in the Omni VI you can lose the station if you 
> don't
> retune the frequency when the station gets out of the passband. In the 
> Icom
> radios (I also had an Icom 740) passband tuning doesn't shift the center
> frequency.
>
> In fact, my Omni-C beats the IC-756 in weak-signal work, except the lack 
> of
> PBT makes it harder to dig out weak signals in between strong stations.
>
> 73, Meir WF2U
> Landrum, SC
>
>
>> -----Original Message-----
>> From: tentec-bounces at contesting.com
>> [mailto:tentec-bounces at contesting.com]On Behalf Of DennisKT5D at aol.com
>> Sent: Sunday, December 19, 2004 5:19 AM
>> To: tentec at contesting.com
>> Subject: Re: [TenTec] Omni 6 sensitivity
>>
>>
>>    I had an Icom-765 for awhile which sported a very good
>> receiver comlete
>> with all the filters for cw work. It had the PBT and IF shift
>> mods done as well.
>> I sat it down beside the Omni 6+ and did some testing. Ambient
>> noise level on
>> both was almost identical with perhaps the edge to the 765. At
>> the time the
>> 765 was matching up with some plans I had for reconfiguring the
>> shack so I was
>> about to decide to sell the Omni 6+. Then the CQ WW CW DX contest
>> came along.
>> After A/B comparison during the contest, I abruptly changed my mind about
>> reconfiguring the shack and selling the Omni.
>>    What I discovered was this. I could tune between two strong US
>> stations a
>> couple of kHz's apart with the Omni and copy a weak DX station, 3 to 4
>> s-units, easily.  Switching to the 765, I absolutely could not
>> hear the weak DX
>> station. All I heard was an elevated noise floor due to the close
>> in strong US
>> stations. Clearly, to my ears the Omni is the superior contest
>> rig of the two. The
>> 765 could hear as well as the Omni in non-contest conditions so
>> sensitivity
>> was not an issue. Both radios exhibited the high pitched hiss on
>> white noise
>> but again, the 765 wasn't quite as bad as the Omni. The
>> selectivity was what
>> really separated the two radios in contest performance.
>>    If your radio doesn't seem to be as sensitivity as it should
>> be perhaps
>> there is a problem with it. The Omni's reputation is well earned
>> here and the
>> 765 is gone.
>>
>>
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>
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