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Re: [TenTec] Question regarding Omni VI+ on SSB

To: "tentec@contesting.com" <tentec@contesting.com>
Subject: Re: [TenTec] Question regarding Omni VI+ on SSB
From: "Jim Brown" <jim@audiosystemsgroup.com>
Reply-to: Jim Brown <jim@audiosystemsgroup.com>,tentec@contesting.com
Date: Wed, 24 Nov 2004 21:40:17 -0600
List-post: <mailto:tentec@contesting.com>
On Wed, 24 Nov 2004 18:27:11 -0500, Jeff Frank wrote:

>ll you guys who report about the great audio reports you receive on ssb
>with the Omni 6 series please tell me what microphones or microphone 
>ups you are using. 

Ah -- you bring up a very interesting defect in the design of the Ten Tec rigs. 
You can't use a "flat" mic with them, you need to use one that has a "hyped" 
high end. That's what the Heil mics do. A good mic sounds really dull and 
bassy on a Ten Tec radio. 

I use an RE-27, which is a pretty flat mic (and a damn good one) with mine. 
But to make it sound good, I had to stick a rather small cap in series with it 
to drastically roll off the low end (-3 dB at roughly 2 kHz). It is absurd that 
should be necessary to do that, but it is. This is a "band-aid," but it works. 
even have an audio file that NY9H recorded off the air several months ago 
on 20 meters from Chicago, when I was operating this rig at W6BX, a 2,000 
mile path. It's this mic, the cap, and the Omni V. I could email the file if 
anyone cares. 

The Shure 444 and mics like it have the hyped high end that sounds pretty 
good with the Omni family of radios. I bought one for that reason. BTW -- 
there's no good reason to spend money on a Heil mic to get that sound -- a 
used 444, $30 on EBay, will sound at least as good as a Heil. For that 
matter, I bought three Plantronics earsets for $5 each at a hamfest last year. 
They get MUCH better reports on my 746 than a Heil does on my K2.  You 
can buy the Plantronics earsets (earphone plus mic) for $25 - $40 brand 
new at computer stores. 

Now, you say, why in the world would you use an RE-27 on a ham rig?  
Simple. I'm in the pro audio biz and own a lot of very good mics, but very few 
dynamic mics. Also, most dynamic mics have proximity effect, which boosts 
the low end (makes them muddy) when you close-talk them).  I didn't have a 
dedicated ham mic, needed one to use with the Omni V I had just bought, 
and the RE-27 came the closest to what should work well. It is a dynamic (I 
only have three types) it  has no proximity effect because it is a variable-D 
cardioid, and it has a lot of output.  Isn't it serious overkill?  If I had to 
buy it, 
yes. But if I have several laying around, no. 

Jim Brown  K9YC

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