This is just my personal preference, but I think a 600hz roofing
filter for CW is ideal. And with the switch point changes, with the
600hz roofing filter switched in, you have DSP bandwidth of 290hz to
1050hz available. I also have not noticed any rcvr degradation when
switching in the 250hz filter, in strong signal enviroments. So for
me, Bill's suggestion still works very well.
If you went looking for hardware design problems, the only one I
know of is the addition of the single stage amplifiers included for
the 250 and 500hz roofing filter positions, however that was done
with good intentions by Ten Tec.Other than that, I believe the
hardware design is pretty solid. Then let's just not talk about
firmware. Ten Tec's record to date with the firmware shows little,
if any, desire to obtain the resources necessary to get the Orion's
firmware code working correct.
Tom - W4BQF
----- Original Message -----
From: "NJ0IP" <Rick@DJ0IP.de>
To: <tentec@contesting.com>
Sent: Monday, December 06, 2004 2:43 AM
Subject: RE: [TenTec] WTB: Ten Tec Filters 217 and 219
Hey guys with Inrad filters,
Bill's suggestion was good before Ten-Tec changed the switching
points for
the roofing filters. Now that they switch at the frequency of
their
bandwidth, perhaps another configuration is required.
I currently have 600 in the 1000, 1000 in the 1800, and 500 empty.
The 1800
filter is currently in the junkbox.
Now I think I would like to get out the soldering iron and jumper
(bypass)
the amp to the 500 and 250 slots. Then I will place the 600 in
the 500
position. This will make the 250 unusable for weak signal work,
but I
almost always only use it on 40m where there is typically enough
signal
strength to cope with the additional loss. What we then need is a
4-pole 250
Hz filter and we'll be in business. Surely someone will come up
with an
idea of how to modify our current 250 Hz by removing some
crystals.
What do you guys think?
73
Rick
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]
On Behalf Of Tommy
Sent: Sunday, December 05, 2004 8:59 PM
To: tentec@contesting.com
Subject: Re: [TenTec] WTB: Ten Tec Filters 217 and 219
Tim,
Having tried what you want to try, if your a CW operator, let me
suggest you follow a suggestion by Bill, W4ZV. Get the Inrad 600Hz
roofing filter. As I don't operate SSB very often, I removed the
2.4kc roofing filter, moved the 1.8kc filter into the 2.4kc slot,
moved the 1kc filter into the 1.8kc slot, and installed the 600 Hz
roofing filter in the 1kc position. Even though I disabled my 500
Hz
TT filter, I kept the 250Hz filter enabled. The 600 Hz 4-pole
roofing filter is just excellent for CW operation. With the 500Hz
filter disabled, my 250 hz filter kicks in/out with a DSP setting
of
around 290 hz. That gives me a 600hz bandwidth roofing filter with
DSP bandwidth from 290 hz all the way up to about 1010 hz DSP
bandwidth. Really does work good.
The 'problem' with what TT tried to do for us who already had TT 6
and 8-pole filters was because of the additional insertion loss of
the 6 and 8-pole filters, they added a single stage amplifier in
the
250 and 500 hz roofing filter position. This amplifier causes
pretty
serious rcvr degradation when encountering strong signals close to
your operating frequency. The Irad (or any 4-pole filter) really
works very good in the 1kc roofing filter position.
73,
Tom - W4BQF
----- Original Message -----
From: "NZ8J" <nz8j@woh.rr.com>
To: <TenTec@contesting.com>
Sent: Saturday, December 04, 2004 10:10 PM
Subject: [TenTec] WTB: Ten Tec Filters 217 and 219
Want to try them as roofing filters in my Orion
If you have either or both for sale please send price shipped to
zip 45324
Thanks
Tim
NZ8J
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