I agree, Paul, and the issue is almost academic since most finals are
operated at very nearly 1:1 SWR loads. What I am questioning is the broad
claim that the Orion can deliver 100 watts to ANY SWR and not melt, without
saying something about the quality of the signal.
I don't doubt that the final devices can dissipate 100 watts - with that
optional fan only?? - but if Joe Ham decides to operate with a 10:1 SWR on
40 SSB (using his 10-meter dipole) what will he sound like? After all, the
specs say that he can operate into any SWR . . .
I agree, Lee, that unless TT has done an exceptional design, unlike other
12-volt finals, the overall performance must be similar. However, there
must be limits to the load mismatch for the distortion products to remain
within limits.
I have measured just about everything under the Sun on my Icom 756 PRO but
I haven't looked at output distortion vs load mismatch. Guess that will be
the next project . . .
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
WA3FIY wrote:
>
> I suspect George is referring to the third and fifth order IM
> products of the final amplifier of the Orion, not the IP3 and IP
> 5 intercept points of receiver.
>
> As far as what the IM products will be in the case of load
> mismatch, I see no reason they would be much different than
> other 100 watt 12 volt final amplifiers. Interesting question
> though.
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