[TenTec] WTB: Ten Tec Filters 217 and 219

[Tommy]

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 at DJ0IP.de>
To: <tentec at 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 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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