To: | tentec@contesting.com |
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Subject: | Re: [TenTec] INRAD Omni VI roofing filter kit - success |
From: | Charles Greene <w1cg@qsl.net> |
Reply-to: | tentec@contesting.com |
Date: | Fri, 14 Jan 2005 14:26:03 -0500 |
List-post: | <mailto:tentec@contesting.com> |
Rick, That answers one question I had. Now another. Why couldn't you install both roofing filters, the 2400 Hz in series with the 600 Hz filter, and only switch the 600 Hz filter with the N-1 switch. That way you would have two filters in tandom when the N-1 filter was switched in. Otherwise, you would have a 2400 roofing filter for SSB. Not that I plan to do this, but I was curious. Another question: Can you replace the stock 2400 Hz 9 MHz filter (Y2 on the 9 MHz Mixer / IF Board) with an Inrad 754, 2800 Hz 9 Mhz filter? At my age I have problems understanding SSB on the OMNI-VI because of its limited audio bandwidth and the LPF in my ears. If you had a 2800 Hz filter in the 9 MHz position, you could use the PBT to offset the bandpass of the 6.3 MHz IF up in frequency 300 Hz, so that the 9 MHz filter would receive 300 to 2800 Hz and the 6.3 MHz 2400 standard filter would receive 600 to 2800 Hz. Loss of below 600 Hz hardly affects intelligibility. On transmit, you would have 300 to 2800 Hz audio vice 300 to 2400 Hz audio. Question 3. Anyone know when the OMNI-VI roofing filters will hit the market? They are listed on the Inrad web site as sometime in the future. Tnx, Chas, W1CG At 11:19 AM 1/14/2005, you wrote: Ken I think that you may have misunderstood where the roofing filter is in the "food chain". The "stock" Omni V and VI have 2-pole filters at the very front end of the 9 MHz IF board. These filters are 12 to 15 kHz (yes that's kHz) wide and hard wired. Their purpose is a first line of defence for nearby signals.
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