[TenTec] Omni VI+

[Ken Brown]

Hi Don,

You said:

 Omni VI+, This rig has the model 220 filter (2.4kc) filter in one of the 
optional 9 mc slots.  What is the advantage of this filter over the 
"standard" one?

The "standard" 9 MHz filter in the Omni VI+ is a model 220, although it 
may not be labeled 220, it is a 8 pole 2.4 kHz BW filter, stock number 
48058. Apparently Ten-Tec's filters only get a model number if they are 
intended to be sold as an accessory. If they are standard equipment, 
sold installed in the rig, they have just a stock number, and not a 
model number. Putting another model 220 filter in one of the optional 
narrow filter slots should provide even greater rejection of signals 
outside the filter band pass, while not narrowing the effective 
bandpass. So you have 16 poles of filtering in the 9 MHz IF when you 
select that filter and 8 poles with neither of the narrow filters 
selected. (not counting the 2 pole 15 kHz BW filter at the beginning of 
the 9 MHz IF system) That can be helpful when there strong adjacent 
"channel" (I hate using that term with ham radio) signals, and you don't 
want to give up any fidelity.

With room for only two narrow option filters in the 9 MHz IF, and being 
more interested in operating CW than SSB, I would not do that. I chose 
two filters of narrower bandwidth. I use a 218 and a 221. If I were a 
SSB enthusiast, I think I'd use an Inrad filter with a 2.1 kHz BW, and a 
218.

I'd really like to have more 9 MHz IF narrow filter slots than just two. 
(Yes I know about the Inrad roofing filter add on mod)

DE N6KB