RE: [TenTec] Redesigning the filter section of the Orion IF

["Richard Detweiler" <rdetweil@hotmail.com>]

Hi Lee,

I think the reason for INRAD going with the 600 hz filter is that 600Hz is 
about as narrow as it can get with out the need for amplification.

Using the 600 Hz filter does reduce the signal by a small amount compared to 
the 1Khz filter,  the 500 Hz filter would do reduce it more than is 
acceptable.

That is the trade off with filters.

I  use the 600 Hz filter for general CW work and the 250Hz filter for 
contests.

The Orion does not seem to have that ringing from static crashes,  it's just 
a pop and over.  That is real good when trying to copy weak signals.

73's
rich
K5SF


> From: Lee A Crocker <lee_crocker@yahoo.com>
> Reply-To: tentec@contesting.com
> To: tentec@contesting.com
> Subject: [TenTec] Redesigning the filter section of the Orion IF
> Date: Wed, 14 Jul 2004 10:03:57 -0700 (PDT)
>
> Given the results of the INRAD 600hz filter replacing
> the 1khz filter in the Orion, has anyone looked at
> modifying the IF board to include all filter position
> in parallel?
>
> >From looking at the schematic, it looks to me you
> could cut a couple of traces, re-route the signal and
> add a nand gate and a couple of steering diodes to
> have all the roofing filters positions available ahead
> of the offending amplifier.  You would need the custom
> filters, but given the apparent ease of modification
> and ready reversibility, it looks like this could be
> done fairly easily.  I haven't measured anything yet,
> just brainstorming.  Has anyone considered this?
>
> 73 W9OY
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