Hi Bill...so good to hear from you...I have the highest respect for
your comments...I did not know that INRAD had built the filters...I
knew they offered the xtals a few years ago...I am looking at trying
to get a little tighter response on 20m and 40m than waht they
offer...but my origional question is where in the rcvr path one would
instal/modify the Orion to get access to a rcv in and out line...the
FT100MP has such on the back of it...labeles RCV IN and OUT...I am
thinking it will require digging into the Orion anmd locating the
ideal place to tap into the rcv line.....possibly to use two of the
existing plugs on the back of the radio that I dont use might make
sense too....thanks for your comments.
de Rick
On Tue, Feb 28, 2012 at 8:20 AM, Bill Tippett <btippett@alum.mit.edu> wrote:
> NQ4I:
> > so to implement what I need
> will require a modification to the Orions in my station to allow the
> insertion of a xtal filter in the rcvr path.
>
> The filter does not need to be inside Orion to be
> in the signal path. It can simply be ahead of Orion
> externally. Inrad already makes such filters here:
>
> http://www.inrad.net/home.php?cat=146
>
> However note that they have wider bandwidths for the higher
> bands (e.g. 50 kHz on 10m vs 5 kHz on 160m). This is because
> it's VERY difficult to make narrow bandwidth filters at higher
> frequencies, although Network Sciences did make a 3 kHz filter
> for the FT2000 at 70 MHz.
>
> If you wanted to cover 10m with a series of 5 kHz filters, I'd
> guess you're looking in the neighborhood of 20 filters (20 * 5 kHz
> = 100 kHz) at a cost >$300 each for a special order.
>
> 73, Bill W4ZV
>
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