Hi Bill....$60 ?/
de Rick
On Mon, May 21, 2012 at 1:56 PM, Bill Tippett <btippett@alum.mit.edu> wrote:
> Cleaning my shack and I found my prototype 600 Hz roofing filter for the
> original Orion. This was the first prototype of what later became the
> Inrad #762 and eventually led Ten-Tec to redesign the front-end for Orion
> II. This is a hand made unit with exposed crystals like original Orion
> 4-pole filters (photo in link below). It also has the distinction of being
> the actual filter used by Rob Sherwood in his comments below, which were a
> vast improvement over ARRL's initial results using the optional 500 Hz
> filter (comparison below is to the stock 1 kHz 4-pole):
>
> * >*
> * > At 5, 10 and 20 kHz, there is no significant difference between the*
> * > stock 1.0 kHz Ten-Tec filter and the Inrad filter.*
> * > At 2 kHz spacing, the improvement is on the order of 6 to 7 dB.*
> * > At 1 kHz spacing the improvement is closer to 10 dB.*
> * > There is some strange hysteresis of a couple dB, as you change the
> level*
> * > around. The IMD does not act exactly as one would expect.*
> * > I am guessing the digital AGC is doing strange things, causing the*
> * > hysteresis.*
> * >*
> * > The insertion loss of filters #2 and #3 are identical to the Ten-Tec
> 1.0*
> * > kHz filter.*
> * >
>
> *http://users.vnet.net/btippett/inrad_.htm (photo and more background)
>
> Please reply direct...best offer over $50 ships Saturday by Priority Mail.
>
> 73, Bill W4ZV*
> *
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>
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