[Elecraft] P3 vs SDR-IQ

Fri Jul 31 09:34:43 EDT 2015

Joe

That is exactly the problem I have with the PX3 - I like my receive filter to be centred, so
I can always see whats going on up the band and down the band. For that to happen on
my PX3, I need to be in tracking mode. But the moment you swing the VFO, the display
loses its averaging, and goes wild. When this happens you can no longer see where
the station is that you were wanting to tune up to. So I end up spinning the VFO….
waiting for averaging to resume so I can find the station I want to tune to…and then 
spin the VFO again. I can only operate with averaging on all the time.
The “fixed mode” sort of/kind of fixes this, but the receive filter no longer stays centred 
in the middle of the display in this mode. And also, in Fixed mode, when it reaches the 
end of the display, it jumps back to the middle, and refreshes the waterfall - so any waterfall
history that you had, is lost :(
I have never used a Flex 6000 series radio, but I have been using, and still have the 5000A,
3000 and 1500. The system they use works just the way I want it - the RX filter remains centred
in the display, and when you tune, the averaging remains on at all times.

73
John, ZS5J

On 31 Jul 2015, at 3:08 PM, Joe Word <n9vx.joe at gmail.com> wrote:

Thanks to all that replied to my post.

1. I am using Tracking mode and have Averaging set at 14. I want to see the
SSB pattern smoothly and not like an O'scope. I always slow the pattern
down to see clearly the transmitted bandwidth and treble/bass balance.

2. I do not use Fixed mode, If I am tuning up the band I want to see whats
ahead, in Fixed mode you can not.  But the scope pattern stays '"clean" in
Fixed mode, I wish it stayed "clean" in Tracking mode. When I say "clean" I
mean Averaging does not revert back to 0 while tuning.

John, ZS5J please note, on the Flex 6500 (and all 6000 series) that used
SmartSDR software, the panadapter is in Fixed Mode (to use a Elecraft term)
and can not be changed. This is the reason I no longer own a Flex 6000
series radio.

I have tried the various Auto Adjust parameters in Fixed Mode, but they do
not resolve my concern.

Joe  N9VX

-------------------------------------------------------
Hi Joe - Do you have signal averaging turned on to reduce the noise floor?
If you do, it has to stop averaging when the freq is being changed while
tuning, temporarily raising the noise floor slightly. It then re-starts
multi-pass averaging once you stop tuning. This is normal for signal
averaging. I run with averaging set =2 or 3 passes. When I tune I barely
notice a small increase in the noise floor. If you have a lot of local
pulse noise, you might want to turn on the P3s NB function to help. If
Averaging is turned off, I can't think of a normal scenario where the
noise floor
would go up when tuning the band. It certainly does not here.

Anyone else have any ideas?

73,

Eric
/elecraft.com/

On 7/30/2015 5:43 PM, Joe Word wrote:

I have been using a P3 with my K3 for the last two weeks and not happy with it's
 operation. I set the parameters to what I like, the patterns look
good, but when
I tune the screen fills with noise and you can not see the signals up
and down the band.
I am told the SVGA option does the same thing. Have owned radios from
Apache Labs and Flex
and used the SDR-IQ/SpectraVue and LP-Pan panadapters and all of them
do not have
this problem. On SDR-IQ/SpectraVue the pattern smears some when
tuning, but no noise.

Joe  N9VX

------------------------------------------------------------------
Has anyone compared the SDR-IQ as a panadapter with the P3?

I am using the SDR-IQ now but would like to be able to use my entire
computer screen for other displays during contests.

Dave N1IX
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