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 typ
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 a
Yes.
-Tim
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mark Mumaw
Sent: Sunday, March 04, 2007 4:15 PM
To: FlexRadio reflector
Subject: Re: [Flexradio] Preamp issue - Results
I get about -130dBm when I use this method. Is this what was is
expected
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 anten
Tom Thompson wrote:
> 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
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
When we calibrated with the XG1 both radios (SDR-1000s) showed the
received signal at S9 after calibration. The 10 dBm difference was
on a signal we tuned to on the air. I think it was on 20m. I have
not yet had a chance to get the radio back on the air at my home to
compare to the Yaesu
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 reason
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 sa
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 y
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 Joe
V8A <[EMAIL 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
)hetnet.nl <mailto:[EMAIL PROTECTED]> ; pa0pvn(a)hetnet.nl
<mailto:[EMAIL PROTECTED]> ;
pa0pvn(a)gmail.com ; pa0pvn(a)amsat.org .
Van: [EMAIL PROTECTED] namens N1OFZ
Verzonden: do 1-3-2007 19:35
Aan: flexradio@flex-radio.biz
Onderwerp: Re: [Flexr
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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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 see
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. Unfo
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 compa
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 FT-
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?
__
--
From: [EMAIL 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
(>
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
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 s
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