George,
I don't see anything to tell me that the transmit occupied bandwidth
of the Orion will be any larger than other transceivers. Where do
you see this? All I see is the transmit bandwidth will be user
adjustable over a wide range. Normally, 2400 hertz bandwidth would
be selected.
Carl Moreschi N4PY
----- Original Message -----
From: "George, W5YR" <w5yr@att.net>
To: <khopper@uchicago.edu>
Cc: "tentec" <tentec@contesting.com>
Sent: Tuesday, August 13, 2002 2:56 PM
Subject: Re: [TenTec] re: No 6M on the Orion (WTB: Ten-Tec 526 6N2)
>
> > ==========================================
> > Quoting from Ken Bourne Mon, 8 Apr 2002 11:28:27
> >
> > http://www.n9vv.com/w6hk.html
> >
> > "Regarding RF power, the ORION's output will be a ROBUST 100 watts, 100%
duty
> > cycle, into ANY SWR! A higher output is not possible, due to the 13.8
Vdc
> > power supply and choice of output device for optimum HF operation.
Regarding
> > HF-only operation (no 6 meters), that decision was based on the type of
> > transmitter output stage for optimum HF operation (a different output
device
> > would be more costly, and would compromise the overall HF performance) .
. . "
>
> While the quoted material above stresses that the finals can deliver 100
> watts, 100% duty cycle into ANY SWR, I wonder what the IP3 and IP5 numbers
> are for 100 watts into nothing more extraordinary than a 2:1 SWR, i.e., a
> 100 ohm load instead of a 50 ohm load.
>
> It is good that the finals will not be damaged by such operation, but what
> happens to the quality of the signal under those conditions? How do the
> intermodulation product magnitudes compare with those under normal load
> conditions? The same? Worse?
>
> The wording of the quotation states that 100 watts will be output into any
> SWR. "Any SWR" presumably includes such extreme operating conditions as
> short or open circuit loads. Does the spec mean that the finals will
> deliver 100 watts into a short circuit? Or simply that the finals will
> survive being connected to a short-circuit load? Surely only the latter .
.
> .
>
> I don't believe that I have seen any intermodulation distortion product
> data in the Orion specs that have been published thus far . . . while
these
> numbers do not provide a complete definition of the transmit audio quality
> of a transmitter, their values do offer a strong clue, especially when
> measured under a variety of realistic load conditions.
> Since the transmit occupied bandwidth of the Orion will be quite large
> compared to other transceivers, it would seem to be a requirement that the
> finals provide very low IP3 and IP5 numbers if it is to be the basis for a
> "hi-fi" SSB station.
>
> 73/72/oo, George W5YR - the Yellow Rose of Texas
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> Amateur Radio W5YR, in the 56th year and it just keeps getting better!
> QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
> Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom IC-765 #02437
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
|