At 01:15 PM 3/4/2007, Mark Mumaw wrote:
I get about -130dBm when I use this method. Is this what was is
expected???
Converting that to an receiver noise figure: 500 Hz = 27 dBHz so
-130-27 = -157 dBm/Hz, compared to a kTB thermal noise floor of -174
dBm/Hz, about 17 dB NF, which is pretty
I get about -130dBm when I use this method. Is this what was is
expected???
Mark NU6X
This is just not possible with the way we do calibration. Something
else is amiss. After calibration against a known source, BOTH of
your
radios should read -90 dBm if you present -90 dBm at the antenna
Mark Mumaw wrote:
I get about -130dBm when I use this method. Is this what was is
expected???
Exactly what mine gets.
Mark NU6X
Bob
N4HY
--
AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
Taking fun as
Dana,
it looks to me that you may have a problem with the filter switches
either on the BPF or the RFE boards. Due to bit errors and/or
unreliable connections wrong filter(s) get selected. That has happened
to me.
73, Ahti OH2RZ
On 03/03/07, N1OFZ [EMAIL PROTECTED] wrote:
When we calibrated
Hi all,
I spent some time last night pouring over the ECO's and determining
which ones were done to my radio. I did end up taking off the BPF
board to get a better look at the RFE. Also during this process I
reviewed the block diagrams that Peter sent (thanks!).
Today with the help of
Dana,
The question of sensitivity still remains as far as I can tell. Can you
borrow an attenuator and bring the XG1 down to the noise floor on both
yours and Joe's radio. The 10 dbm difference may be a calibration
issue rather than a sensitivity issue unless you can still hear signals
on
Hi Dana,
Are you saying that, with the same signal input (from
a test generator, for example), your radio, after
calibration, shows roughly a 10 dB difference in its
s-meter reading compared to the other radio?
My experience with several Flex radios is that, if
they're both calibrated with the
are both s-meters calibrated to the same point?
for example
50uv for s9?
I had to adjust my Kenwood to the same S9 50uv I believe and they read almost
the same all the time.
I didnt see that mentioned anywhere, but if I missed it sorry
I am missing some emails for some
Hi all,
I've been happily using my SDR-1000 as an IF rig for transverters for
a month now. It seemed to be performing fine. This weekend I put up
dipoles on 10 and 20m and decided to see how it worked on HF and I
was disappointed. I hooked the same antenna to my FT-847 and was
hearing
Hi Dana,
You did not mention the setting of your RF
control. Have you tried that at a high
( 100) setting?
On earlier versions of PowerSDR,
under the AGC pull-down
choose Custom,
then on the Set Up menu option,
DSP,
AGC/ALC,
under the AGC column you can increase the
Max Gain to as sensitive as
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Naruta
Sent: Thursday, March 01, 2007 11:19 AM
To: N1OFZ
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Preamp issue?
Hi Dana,
You did not mention the setting of your RF
control. Have you tried that at a high
( 100) setting?
On earlier
It was set at 100. I've increased it (all the way) to 120 and there
is no difference audible or on the meter.
On Mar 1, 2007, at 11:13 AM, Mike wrote:
You did not mention the setting of your RF
control. Have you tried that at a high
( 100) setting?
But Dan's not just comparing S-meter readings. He's talking about being
able to hear signals on the FT-847 that he can't hear on the SDR-1000.
I have no ax to grind in this, as I have neither rig.
73
Alan NV8A
On 03/01/07 12:00 pm Tim Ellison wrote:
Also, don't trust the S meter on the
On 3/1/07, Tim Ellison [EMAIL PROTECTED] wrote:
Also, don't trust the S meter on the FT-847. If you have calibrated
using a signal of known strength, the SDR-1000 is much more accurate.
If you have an accurate 1uV signal generator, you can test the
absolute sensitivty of the rx and compare
Tim,
I don't, but when I have an S3 signal on the FT-847 that I hear
clearly and I tune the same freq on the SDR and I hear nothing but
static it leads me to believe that the 847 is not too far off. A S5
signal on the 847 is clear as a bell and on the SDR it will be barely
copyable.
Thanks everyone for the suggestions.
A local SDR owner has offered to give me a hand. Hopefully I'll be
able to determine quickly if it's a software or hardware issue. I'll
report back my finding.
I have to say that the SDR community has been the most helpful and
supportive group I've
I'm running an SDR 1000 with the FA-66. My back-up rigs are a 950SDX and a Pro
3. The SDR blows them both away on transmit and receive.
Scotty
N6EDV
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Van: [EMAIL PROTECTED] namens N1OFZ
Verzonden: do 1-3-2007 19:35
Aan: flexradio@flex-radio.biz
Onderwerp: Re: [Flexradio] Preamp issue
PROTECTED]
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Preamp issue?
Date: Thu, 01 Mar 2007 12:33:44 -0500
But Dan's not just comparing S-meter readings. He's talking about being
able to hear signals on the FT-847 that he can't hear on the SDR-1000.
I have no ax to grind in this, as I have
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