On Sunday, February 2, 2003, at 11:38 PM, Ken Brown wrote:
Hi Clark,
Thanks for the information. This makes better sense than another reply
I had received. So if I understand you correctly, the later version has
two buttons for the 9 MHz filter selection that allow the following
three 9 Mhz filter combinations:
1) The 2.4 kHz wide standard 9 MHz filter only
2) The 2.4 kHz standard filter cascaded with number 1 optional narrow
9 MHz filter
3) The 2.4 kHz standard filter cascaded with number 2 optional narrow 9
MHz filter
When neither the N1 or N2 button is lighted, you are using mode 1,
above.
Exactly. So you will have 8 poles (standard filter) engaged all the
time, but when optional filters are engaged, you get one of them
cascaded in that 9 MHz IF (16 poles normally).
And in the 6.3 MHz IF only three buttons are used to select between the
following four options:
1) The 2.4 kHz wide 6.3 MHz IF filter
2) The 1.8 kHz wide 6.3 MHz IF filter
3) The 0.5 kHz wide 6.3 MHz IF filter
4) The 0.25 kHz wide 6.3 MHz filter
The 6.3 MHz IF filters are never cascaded (not with other 6.3 MHz IF
filters, though there is always one of the three 9 MHz filter
combinations listed above being used) and when none of the 1.8, .50,
.25 buttons is lighted you are then using the 2.4 kHz 6.3 MHz IF filter.
Yes.
Of course all of the above assumes that all the optional filter slots
are filled, and the filters (excepting the 2.4 kHz 9 MHz IF standard
filter) could be different bandwidths than stated above.
Yes. Now, I have replaced the stock Ten Tec 2.4 filters with INRAD
2.8's, but that is not a real difference. You can get INRAD 10 pole 2.4
filters in there, too, or even 2.1's, but the scheme stays the same
(different filter characteristics for sure, though.)
73
Clark
WA3JPG
Do I understand correctly?
Thanks again,
Ken
Clark Savage Turner wrote:
On Sunday, February 2, 2003, at 06:08 PM, Ken Brown wrote:
and consequently a similar lack in the responses, I still do not know
whether the most available spaces is two total, or two optional
filters for a total of three (counting the standard 2.4 kHz filter),
not counting the 15 kHz two pole filter. If a total of three is
available on a more recent 9 MHz mixer/IF board, how does the
selection and indication of which filter is in use work? Push the
button three times to scroll through all three possibilities and back
to the beginning? How do you know which one of the narrow filter
options is in use (other than by how it sounds, or remembering how
many times you pushed the button) a two color LED perhaps?
The later version, option 3 upgrade to the OMNI VI, and the OMNI VI
plus, provides for a total of 3 filter possibilities, one stock
standard for SSB and two options (not including the FM roofing
filter). Your OMNI VI is an older version, then, if you only have two
slots, one for the stock filter and one option (NAR button) in the 9
MHz IF. The later board provides two options, and a button is added
to the front panel, N1 and N2 for that 9 MHz IF. Then the 6.3 filter
positions still include a 1.8, 500 and 250 buttons for those slots.
Pushing the button toggles on and off, so if you have the 1.8 pushed
(LED on) and you want to go back to 2.4 (or whatever filter you have
in that stock position), you merely push the button again.
Its a fine radio.
Clark
WA3JPG
Ken N6KB
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