I believe Paul, W9AC, has an ADAT-200A...and a K-3
73, Brian K3USC
On May 30, 2013, at 12:07 PM, William Hein <bill.aa7xt@gmail.com> wrote:
> I am collecting info on tx phase noise on current rigs and am not sure I am
> interpreting the data correctly. I am also collecting techniques to mitigate
> same.
>
> The Swiss company that makes the ADAT-200A advertises ", the transmit signal
> is processed by adaptive predistortion, a technique that is used for the
> first time in amateur radio. This technology stands out due to high
> efficiency and a remarkably clean transmit spectrum, combined with an
> exceptionally clear modulation." But does anyone actually have a ADAT-200A?
>
> Will GPS clock syncing the LO reduce tx phase noise?
>
> Will operating a tx in Class A reduce tx phase noise? I believe the
> FTdx5000MP will operate in Class A, not sure about other rigs. (Not sure
> Class A applies to CW mode operation.)
>
> Seems like a good idea to leave ALC switched off, true?
>
> The Flex 6000 series, according to a recent newsletter:
> "the preliminary specifications provided in the FLEX-6000 Signature Series
> brochure projected an industry leading phase noise of -147 dBc/Hz at a 10 kHz
> offset and -152 dBc/Hz at a 100 kHz offset. After detailed phase noise
> measurements in the lab, lets just say we have a great big smile on our face!"
>
> By way of comparison, here is some info on the K3 vs. other rigs reported by
> Elecraft's WA6HHQ which I found via Google:
>
> "Here are transmit composite phase noise numbers from the Lab for the K3.
> Needless to say, we are pleased with the results. :-) I've also included
> some numbers from the ARRL reviews for several late model rigs.
>
> Rig 1kHz 2 10 20 50 100 1M
> K3 -110 -119 -136 -140 -143 -144 -150
> IC7800 -103 -112 -130 -138 -140 -140 -140
> FT2000 -102 -105 -128 -129 -128 -128 -128
> ORION 2 -121 -129 -126 -125 -118 -128 -138
> OMNI 7 -102 -103 -120 -123 -127 -129 -126"
>
> How to compare apples to apples here? How does -147 dBc/Hz at 10 kHz offset
> measure up with the -136 dB @ 10 kHz figure reported for K3 above? Even
> thought "dB" appears in both measurements not sure they are using the same
> reference point or are indeed the same metric at all.
>
> 73
> Bill
>
> William Hein, AA7XT
> ex-AA4XT, NT1Y, AA6TT, KC6EDP
>
> Blog AA7XT.com
>
> ARRL, CSVHF & AMSAT Life Member
> UKSMG & QCWA Member
> 1st licensed 1969 - WN6NDC
>
> 1st W to OH0 6m QSO
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>
> Tel +1 (970) 628-5120
> Email Bill.AA7XT@Gmail.com
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>
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