I just picked up a 1st IF 400Hz InRad Filter. Checked my OMNI VI manual and it says follow the instructions included with the filter. That helps a lot if you have those instructions. HI HI. When I pu
For your 400hz filter, follow the instructions for the TT 217 filter installation: the jumper should be in the "HI" gain position, shorting the left and center pins. 73, Barry N1EU __________________
Don, Did you get the install instructions for the INRAD roofing kit? There are a couple different ways you can install it, one of which is to use N1 or N2 soft switches to activate it. The other way,
Neal, My OMNI VI with OPT 3, it is not a VI+. I have been monkeying around with the DIP switch on the INRAD roofing filter cca and the jumper next to the "narrow filter". It seems as though the OEM n
Don, Do you have the instruction sheet? It can be wired to work off of either N1, N2, or full-time. If it was not using one of the narrow switches you would certainly notice it on SSB. I'm still tryi
After looking at a 564 schematic it does appear that Y2 (standard 2.4kHz) could be replaced with a 9 MHz 1.8kHz or 500Hz filter for the roofing filter and N1 and N2 (Y3 and Y4) can be 9MHz CW filters
Neal - That is the set-up I am running, three INRAD filters in a row. An INRAD CW roofing filter and INRAD 250Hz filters in both IFs. It works really well in contesting. For casual operating I run th
John, How cool! That's where I'd like to get for sure, but I'd try things out with the 2.4khz roofing filter first (since that's what I have). I was remarking to a friend of mine the other day how bo
Actually they're not in a row because there are FOUR filters active - there's a Ten-Tec #220 filter after your roofing filter. Received signals are passing through 29 poles of quartz filtering in you
I love it - "the filters ate my audio" ;-) (it's probably true) 73, Barry N1EU _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/ma
John, I think this is the problem I am having with my 6 (opt 3). I have TT 250Hz Filter in the 2nd IF and it's center freq does not line up with the 1st IF new INRAD 400Hz CW Filter. In addition I ne
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 25 Jan 2011 18:05:51 -0600
Lining up the two filter passbands is a front panel control. Called PBT, paragraph 3.5-12 in the manual. Its anticipates that the first filter would always be SSB bandwidth, so the bandpass tuning wi
Don - When I was discussing the passband of the two filters, what I was really getting at was the passband ripple of the two filters. I don't think that they have very good shaping compared to the IN
John 'CQ and John 'RE, Good points guys. I do have the TT 250Hz CW Filter in the 2nd IF. Which pretty much matches what John has described. I do notice that things are reasonable using the INRAD Roof
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 Jan 2011 23:25:10 -0600
I use an external speaker passive low pass filter to tone down high frequency howling in my receiver audios when needed. I have a couple circuits, but one that I published is on line at: http://www.g
Please forgive my novice inquiry, I'm only part way through the ARRL Understanding Basic Electronics book....and I hate mathematics, so it is slow going. Trying to understand the schematic in your ar
Do you have "LP" engaged (you should)? Have you ever aligned the receiver? From your description, it doesn't sound like it's up to snuff. That receiver should be tough to beat. 73, Barry N1EU _______
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 11:30:54 -0600
Ah, but describing the circuit with math allows easy analysis and creation without having to assemble a million combinations of parts and measuring to see the results. This filter is a low pass with
Very nice job Jerry. 73, Don Jones KO7i Arlington, WA I use an external speaker passive low pass filter to tone down high frequency howling in my receiver audios when needed. I have a couple circuits
Yep, Even with the LP is set to 600Hz the receiver still howls. And, no I have not done an alignment. Yes, the VI "should be tough to beat" especially with a full load of filters AND the INRAD roofin