That's useful info for comparison, Alan.
To satisfy my curiosity and answer the original question, I just ran a
similar test with my LP-PAN, with and w/o the upcoming preamp mod kit.
First, I should mention a couple differences in PowerSDR/IF and the P3. With
PowerSDR/IF the sampling rate is
I do not have a P3, so my comments are based on my experience using
the SDR-IQ on 144-MHz using a 144/28 converter to receive 2m-eme signals.
The sensitivity of the display is tied to the sampling rate (FFT/BLK
size on the control panel of the SDR-IQ). With maximum sampling of
262,144 I get a
Also, the waterfall (or Panafall) display should be used to
take advantage of the averaging, which reduces random noise.
That's a point I forgot to mention. If you turn on averaging in the
waterfall you can see farther down into the noise. It works best on
steady carriers. With CW signals
On Sep 15, 2010, at 10:15 AM, Alan Bloom wrote:
If you turn on averaging in the waterfall you can see farther down into the
noise. It works best on steady carriers. With CW signals you have to keep
the averaging time less than a dit.
I have found that per-bin averaging of the power
Sorry, but the only way of handling this well is proper interleaved style.
Edward R. Cole wrote:
The sensitivity of the display is tied to the sampling rate (FFT/BLK
size on the control panel of the SDR-IQ). With maximum sampling of
262,144 I get a bin size of 0.42 Hz. This also referred
Don,
I'm using a Softrock IF kit (plus Z1B buffer amp) as a panadapter with a
~£275 Samsung NC10 netbook. Initially I was surprised but it works well with
the internal Realtek HD soundcard.
It runs LP Bridge, PowerSDR/IF and N1MM or Logger23 smoothly; with an extra
LCD monitor this gives
Hi,
I have been using LP-PAN for a couple of years. In spite of not owning a P3
I think I know enough about its capabilities to comment about the
comparison. The P3 definitely has better sensitivity. LP-PAN is currently
quite poor in that respect, but Larry is working (feverishly I hope) to
Bill,
I can tell you that just last night, on 160 meters, I copied 2 very weak
stations perfectly Q5 that did not show on the P3 waterfall. Now, Its
entirely possible its my adjustment skills but I dont think so. Yes..the K3
IF Mod was factory installed. This has happened more than
are fine, even after 61
yrs of ham radio...ok for weak sig detection...73 Steve, W6HPK
- Original Message -
From: Larry K1UO k...@uninet.net
To: elecraft@mailman.qth.net
Sent: Tue, 14 Sep 2010 13:03:01 - (UTC)
Subject: Re: [Elecraft] LP Pan versus P3 Panadapters
Bill,
I can tell
Corrections: beacons at 14100 Mhz, not 14000 Mhz,,,Steve W6HPK
- Original Message -
From: shwha...@comcast.net
To: Larry K1UO k...@uninet.net
Cc: elecraft@mailman.qth.net
Sent: Tue, 14 Sep 2010 16:22:46 - (UTC)
Subject: Re: [Elecraft] LP Pan versus P3 Panadapters
Hi Larry all; I
Hello all -- K0AWU here
I am reading this thread with great interest. I apologize to those that have
seen similar messages from me on this subject in the past. I had SO HOPED that
with such a large number of P3s now in the field I would have seen reports on
weak sig detection from some of
Hi Larry,
It depends on the span. Unlike some other panadapters, the P3
automatically reduces the sample rate as you narrow the span, which
improves the sensitivity.
For example, I have my HP8656B signal generator set to 3640 kHz with the
amplitude as low as it will go (-127 dBm). The K3 has
for analysis of the IF information, rather than say a P3.
KJ4VPI
From: Alan Bloom n...@cds1.net
To: Larry K1UO k...@uninet.net
Cc: elecraft@mailman.qth.net
Sent: Tue, September 14, 2010 1:00:30 PM
Subject: Re: [Elecraft] LP Pan versus P3 Panadapters
Hi Larry
For some reason that goes against what I think many are looking for in the
P3, if one has to narrow the span to 2khz, then I see no use for the P3
at all, I need
to see what is on the band at -127DBm at 30 to 50khz or more span. If
the signal is
only seen at 2KHZ, I can hear that by ear and
No I didn't have to narrow the span to 2 kHz to see the -127 dBm signal.
Anything less than about 30 kHz was sufficient.
Also, remember I had the K3 preamp off and the attenuator on. With the
attenuator off, the -127 dBm signal is visible all the way up to 200 kHz
span.
With the K3 preamp
Hi Alan,
Ill admit I didnt try a narrower span and I normally use the +-15Khz
setting (30Khz span) on the 160 meter cw band. Ill try narrowing it up and
see if it picks up the very weak signals but I dont want to operate on a too
narrow span or, as they say, it becomes much less useful to
Alan, thanks for the explanation, sounds like there is some other
problem then
if people are not seeing the weak signals that they can hear.
Will hook up the P3 here shortly and see what mine does. If you can see
-127DBm
at 30 KHZ it sounds fine to me.
73 Merv K9FD / KH7C
No I didn't
To All,
Can you please provide comments on the LP Pan versus the P3 Panadapter on the
K3.
The LP Pan seems to have a lot more features compared to the P3 and the cost is
so much less.
I understand that the LP Pan requires a PC but you get a bigger screen when
using a PC.
What makes the
I don't yet have a P3, but I do use an SDR-IQ as a panadapter. I used an
LP-Pan for a little bit before this.
If I had to state one advantage for either of these compared to the LP-Pan it
would be this: Neither of them uses PowerSDR.
Wes N7WS
--- On Mon, 9/13/10, Paul Maruna
Paul,
I don't see you getting a lot of comments, so I'll throw in a few cents
worth, hi. I bought the P3 for several reasons, but the main one is NOT for
what it is right now, but what I think it will be over time. It will have
VGA output at some time and allow the big screen, and I feel we,
detection with the P3
after many requests to the initial testers of the P3. ANYONE out there looking
for weak weak sigs with a P3??
73 Bill K0AWU EN37ed
---
From: pmar...@yahoo.com
To: elecraft@mailman.qth.net
Date: Mon, 13 Sep 2010 20:00:52 -0400
Subject: [Elecraft] LP Pan
Bill,
I cannot say anything about the comparison of weak signals on the
waterfall between the two,
but one great advantage of the P3 is the ability to adjust the span -
you can go from observing a 200 kHz chunk of the band (-100 kHz to +100
kHz) to a width that will allow you to examine a
Bill,
All I can tell you is if I can hear it I can see it!
Rick
K6LE
On 9/13/2010, at 9:01 , Bill Davis Jr wrote:
I too would like to see details of the improvement over LPan etc. I am a
long time user of SDR/computer panadapters for use in detecting very weak
signals at
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