Bill,
Why not just go with the tentec 250 hertz filter? It is model 219.
Carl Moreschi N4PY
----- Original Message -----
From: "Bill Tippett" <btippett@alum.mit.edu>
To: <tentec@contesting.com>
Sent: Monday, May 05, 2003 11:08 AM
Subject: [TenTec] Hello Orion Users
> VE1BN:
> >Can anyone tell me what extra Ten-Tec filters are required
> for the stock Orion?
>
> Don, none are required, but the Ten-Tec 217, 218 and 219
> are options to the Orion:
>
> http://www.tentec.com/HFxcvrStore.htm
>
> Unless you are doing serious contesting, I tend to agree
> with N4PY that they may not be necessary. However, I'll
> probably order Inrad's 400 Hz filter, but not the 1800 or
> 250 Hz filters. Remember that Orion's standard roofing
> filters are 2400 Hz for SSB and 1000 Hz for CW compared to
> the usual 10-20 kHz filters in traditional designs (e.g.
> FT-1000MP uses a 12 kHz roofing filter at 70.4 MHZ). So
> the standard Orion will be head and shoulders above other
> radios, EVEN WITH NO OPTIONAL FILTERS. Here are close-in
> 5 kHz IMDDR3 comparisons (remember that these were made
> with Orion's STANDARD 1000 Hz roofing filter):
>
> Close In IMD Dynamic Range at 5 kHz Signal Spacing
> (ARRL Lab Results, Preamp off on 20M):
>
> Rig IMDDR3
>
> Ten-Tec Orion 101*
> Elecraft K2 88
> Ten-Tec Omni 6+ 86
> Yaesu FT-1000MP 83
> ICOM IC-756 Pro 80
> Yaesu FT-1000MP Mark V 78
> ICOM IC-775DSP 77
> ICOM IC-756 Pro II 76
> ICOM IC-706 MkII G 74
> Yaesu FT-1000MP Field 73
> Kenwood TS-570D 72
> Kenwood TS-2000 69
> ICOM IC-756 67
>
> *Ten-Tec spec not yet verified by ARRL.
>
> The reason I want a 400 Hz roofing filter is mainly
> for contests, when it is not unusual for an S9+40dB
> signal to be only 500 Hz away while I'm trying to hear
> an S3 guy answering me. The optional 400 Hz filter
> should make the above IMDDR3 measurements look similar
> for interfering signal spacings of only 500 Hz!
>
> http://www.qth.com/inrad/graphs/759.gif
>
> Orion should be able to hear signals 25 dB weaker than
> a radio with an IMDDR3 spec of 76 dB when a very strong
> interfering signal is within 5 kHz (and that difference
> will probably increase even more at closer signal
> spacings)...that's a VERY BIG DEAL for contests or in
> an unruly DX pileup on 160!
>
> 73, Bill W4ZV
>
>
>
>
>
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>
>
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