Thanks for the input Larry, that puts it into perspective; which helps
Dennis, k0eoo
- Original Message -
From: "Larry Savage"
To: "Flex List"
Sent: Saturday, June 27, 2009 10:50 AM
Subject: [Flexradio] Why a 6Meter Preamp Is Needed
The Flex 5000A currently has a noise figure of approx. 16 to 20dB at an
MDS of approx. -126dBm..Addition of a low noise figure preamp (<$100)
can substantially improve the receiver noise figure but is not mandatory
for normal operation. My reference rig is the Icom Pro III which has a
6 meter MDS of approx. -142dBm with a noise figure of approx. 5 to
8dB...With an appropriate preamp the Flex can reach this level of
performance with a better dynamic range to boot..Other brand rigs have
the same problem as the Flex 5000A (ex K3 sells a 6M preamp) when it comes
to sensitivity and noise figure.The preamp is only needed if you wish
to do weak signal work..In general one should consider the total
system noise figure of the stationOne of the best performance
improvements can be had by reducing the feedline losses.Losses in the
receiver front end directly reduce the receiver noise figure and feedline
affects both TX and RX performance.There
are many other metrics one should consider in rig performanceI own
several of the top-end rigs and have found the Flex 5000A beats them hands
down in overall receiver performanceThe receiver dynamic range
(weakest to strongest signal) for the Flex is phenominal..The receiver
noise reduction along with the filtering is additionally on par with >
$10K rigs.
In the words of an old timer.spend all your money on the antenna and
feedline if you have any money left over buy a rig..
73s WA4CAX...
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