I haven't noticed this either, but I may check for it a little more closely
now....I'd like more info if there is any available as
well...73...Jordan....
----- Original Message -----
From: "David Beumer W0DHB" <d...@w0dhb.net>
To: "Ian Wade G3NRW" <g3...@yahoo.co.uk>
Cc: <flexradio@flex-radio.biz>
Sent: Tuesday, October 20, 2009 12:25 PM
Subject: Re: [Flexradio] Flex 5000 transmit spur -- any validity to this
Tim, Dudley
I have not observed this -- what's the scoop ?
Dave
W0DHB
Ian Wade G3NRW wrote:
I just came across this contribution from Joel, W5ZN, in the top band
contesting list, and was surprised to read the second paragraph ("Also,
be aware ...").
As a prospective Flex 3000 purchaser, should I be concerned?
------- Forwarded message follows -------
Subject: Topband: noise floor
Newsgroups: !topband
To: 'Pete Parisetti' <hb9...@gmail.com>, topb...@contesting.com
From: Joel Harrison <w...@arrl.org>
Reply-To: w...@arrl.org
Date: Sun, 18 Oct 2009 21:35:06 -0500
Message-ID: <80c27fa30e524e5796108d76c2458...@wgint.net>
Pete - one other thing I need to mention if you haven't noticed
already....The noise floor will be different with each of the three
sampling
rates (48, 96, 192). This doesn't change the signal to noise ratio will
change the display. The lower the sampling rate the lower the noise
floor.
Also, be aware that the Flex 5000 has a transmit spur approximately 2.4
KHz
down from the fundamental freq. If you are calling a station up 2 KHz or
so
and are running an amplifier you will most definitely put out a signal,
thanks to the spur, that people can hear. Flex is very aware of this but
they have NOT, repeat NOT fixed this. One of their software gurus did
write
a MANUAL software routine in PowerSDR to address this hardware issue and
it
does reduce the spur significantly but the procedure is a manual
procedure
and is only effective on one band at a time. If you change bands, you
have
to run the manual routine again. It is cumbersome.
After being "busted" twice on two different bands because of this I no
longer run my Flex 5000 on HF for transmitting. It has a very good
receiver
and the calibrated dBm scale is great to use for signal comparison and
love
it for that, but just be aware of the xmit spur.
I can give you more specific details if desire.
73 Joel W5ZN
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