[TenTec] WTB: Ten Tec Filters 217 and 219

[Bob Henderson]

Hi Rick

I think that seems like quite an adventure.

Bob, 5B4AGN

----- Original Message -----
From: "NJ0IP" <Rick at DJ0IP.de>
To: <tentec at contesting.com>
Sent: Monday, December 06, 2004 7:43 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 at contesting.com [mailto:tentec-bounces at contesting.com]
> On Behalf Of Tommy
> Sent: Sunday, December 05, 2004 8:59 PM
> To: tentec at 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 at woh.rr.com>
> To: <TenTec at 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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