Bill and List,
FYI
Before you take advantage of the filter sale from Inrad for use in an
ORION I would check on the insertion loss of the Inrad filters to make
sure they are similar to the Ten Tec filters. The filter positions in
the ORION are equalized for 'Ten Tec' filters and there is no adjustment
available.
Also, if you put in a 400 hz filter into the 500 hz filter position you
will loose the ability to adjust BW between 400 and 500 hz as the 500 hz
position is enabled when the DSP BW is 500 hz.
73,
Bill - K6WLM
Bill Tippett wrote:
>
> 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
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
|
