[CCF] FW: [CQ-Contest] TenTec Orion questions regarding SO2R suitability

[jukka.klemola at nokia.com]

Kannattaa huomata erityisesti ongelma #2 vastaus jossa kerrotaan
DSP radioiden ominaisuudesta.
Jos on kunnon DSP ja kunnon välitaajuusfiltterit samassa paketissa,
homma toimii mutta leveä ja huonohko (keraaminen & >10kHz) 
välitaajuusfiltteri, sitä ei oikein nykyisillä DSP:llä saa
parannettua.

73,
jukka

> -----Original Message-----
> From: ext Bill Tippett [mailto:btippett at alum.mit.edu]
> Sent: 08 May, 2003 19:46
> To: cq-contest at contesting.com; eric at k3na.org
> Subject: [CQ-Contest] TenTec Orion questions regarding SO2R 
> suitability
> 
> 
> Hi Eric!
> 
>          I'm not an Orion user but soon will be (June?).
> 
> K3NA wrote:
> 
>  >POTENTIAL PROBLEM #1:
>  >
>  >Can an Orion user clarify if any receiver continues to 
> operate while 
> transmitting?
> 
>          Orion is not SO2R in a box...neither is any other 
> radio.  Yes, 
> both receivers are muted while transmitting.
> 
>  >POTENTIAL PROBLEM #2:
>  >
>  >Does anyone have better specs for the sub-receiver?
> 
>          The sub-receiver is probably closest to Ten Tec's Jupiter,
> but unfortunately ARRL's test in June 2001 was the month before
> they started doing 5 kHz measurements.  Performance is most 
> likely similar 
> to other DSP radios using wide (12-15 kHz) roofing filters.
> 
> http://www2.arrl.org/members-only/prodrev/pdf/pr0106.pdf
> 
> Close In IMD Dynamic Range at 5 kHz Signal Spacing
> (ARRL Lab Results, Preamp off on 20M, 500 Hz BW)
> 
> Radio                         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.
> 
>          In comparing prices, keep in mind that Orion at $3300
> may need only one optional filter (500 Hz).  Orion's standard
> roofing filters (6000, 2400 and 1000) in combination with
> 3rd IF DSP probably yield better performance than other radios
> (using typical 12-15 kHz roofing filters) which have a FULL
> complement of dual-cascaded filters.  The only reason I'm
> ordering Inrad's 400 Hz filter is to hopefully get IMDDR3
> performance close to the above at signal spacings UNDER 1
> kHz (for 160 mainly).
> 
>          I believe you missed the objective thinking it was SO2R.
> That objective would have had an extremely limited market and
> was never the goal.  From Doug Smith's site, the goal was:
> 
> "certain innovations and a level of performance previously 
> unattained by 
> any HF Amateur Radio transceiver, bar none."
> 
> http://www.doug-smith.net/orion.htm
> 
> I'm sure we'll all know more after ARRL does their tests!
> 
>                                                  73,  Bill  W4ZV
> 
> 
> 
> 
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