Ten Tec Omni VII
I have been looking over receiver specifications here. I am really interested in the layout of the Ten Tec Omni VII.
It is a 3 IF stage receiver. The main roofing filter is 20kHz. Then, apparently, they put in a 6 and 2.5kHz filter in the second IF stage and have provisions for optional 500hz and 300hz filters.
I found this to be very interesting - Ten Tec calls this set up their "distributed roofing filter architecture" (second sentence in the second paragraph).
If filtering is taking place in the second stage, how can that be called roofing? That would be like calling the top floor of a 2 story house the "roof", would it not?
My take on roofing is that it applies to the FIRST stage - it is the main line of defense for the rest of the circuitry in the rig.
I am sure the second stage filtering works. It would surely smoke the filtering on my TS-2000. I wonder how well it really works in real-world use, though.
It is a 3 IF stage receiver. The main roofing filter is 20kHz. Then, apparently, they put in a 6 and 2.5kHz filter in the second IF stage and have provisions for optional 500hz and 300hz filters.
I found this to be very interesting - Ten Tec calls this set up their "distributed roofing filter architecture" (second sentence in the second paragraph).
If filtering is taking place in the second stage, how can that be called roofing? That would be like calling the top floor of a 2 story house the "roof", would it not?
My take on roofing is that it applies to the FIRST stage - it is the main line of defense for the rest of the circuitry in the rig.
I am sure the second stage filtering works. It would surely smoke the filtering on my TS-2000. I wonder how well it really works in real-world use, though.
posted by Steve at
12:29 PM
3 Comments:
According to the reviews on eham and
the many hams I have worked that use
the rig, the filtering is great and
the receiver sensitive. Hams have
told me they are able to work stations
they could not hear before using the
new Omni. The cw note is super, the
rig sounds great. All of this is to
be expected from this fine company with
perhaps the best service dept in amateur
radio. Personally, I'm planning on
buying a Omni VII.
I am now the proud owner of a Omni VII. Having been a ham for 25 years I can truthfully say it is the finest receiver I have ever used. It is quiet beyond belief yet can hear a pin drop. On direct comparison with my Ten Tec Pegasus, it hears stations the Pegasus cannot and continues to hear stations
in qsb when the Pegasus long ago lost it in the noise. The filtration has enabled me to work weak cw stations 200Hz away from a s9 signal. The Omni shrugs off ignition noise and static crashes. It simply makes it possible to hear stations I once could not. It is terribly easy to use too, the manual is hardly needed.
So I would not concern myself with where this fine company put the filters, in the first stage or the second, they know
what they are doing. What's important
is that Ten Tec built a fine rig here
by looking at things differently and
concentrating on performance. It's what
the do again and again
73
I recently acquired an Omni VII, the more I use it, the more I like it. I have a unique circumstance here that I don't think any other amateur in the world can top it on a daily basis. That is, I have a local ham in the neighborhood who strickly operates 75M AM. He has a beautiful Bauer 707 AM transmitter mated to a Collins 75A4 receiver. He is only 5 houses up the street from me. Needless to say, whenever he keys up, my entire 75M band is pretty much wipes out. I cannot copy anything anymore. The receiver just becomes "numb". I have had the Flex 5000A, the FDTX-9000, FT-2000D, TS-950SDX, Orion II, etc... just to name a few. None of them can tolerate his AM carrier no matter how far away I am on 75M with the exception of the Orion II. With the Orion II, I can be about 100KC away from him and able to copy the signal of the station whom I'm in QSO with. On the Omni VII, I can be as close to him as 25KC and able to copy the station in QSO me. This is the ONLY radio so far that I've found with such tight and discrete receiver.
That and for that alone makes the Omni VII stand out above the croud.
Beyond that, I find that the receiver is also very quiet, the transmit audio is fabulous, the menus are easy to understand and configure. The only thing I don't like is the feel of the knobs -- they are a bit "lightweight".
73,
Duke - NA1A
http://na1a.us
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