Hi group, has anybody made bad experiences with any spurious singals,
spikes etc. during reception of broadcast or amateur radio stations on HF
with SDR???
Only the computer normally produces a lot of disturbing signals from its
main osciallator and all the divider stages for all the various
--- In soft_radio@yahoogroups.com, Helmuth Jim Meyer [EMAIL PROTECTED]
wrote:
Hi group, has anybody made bad experiences with any spurious singals,
spikes etc. during reception of broadcast or amateur radio stations on
HF with SDR???
Only the computer normally produces a lot of disturbing
At 08:53 AM 8/25/2007, you wrote:
Another source of spurs is the local oscillator of the SDR, if
implemented with a DDS. Only the very recent DDS like the AD9912 start
to be acceptable under this point of view.
Products like the AD9954 (much valued by some because it has I and
Q outputs) are
Hello Fred, Alberto and all,
I'm investing an interesting time in the SdR theory. One particular message of
this group makes me problem.
The problematic sentence is the following:
1° Mix the time domain Q I signal with a NCO to make a near to zero
signal(this before the FFT)
It seems that
Programs like soft rock would be better with a crystal front end it
seems to me. The computer does the actual tuning. Beside the spur
problem a crystal has less phase noise.
k5nwa wrote:
At 08:53 AM 8/25/2007, you wrote:
Another source of spurs is the local oscillator of the SDR, if
Another source of spurious signals is the PC CRT Monitor, I do not
know the effects of flat screens. The vertical and horizontal sweep
frequencies along with noisy circuits in the monitor produce allot of
spurs.
You can move the location of the spurs around frequency wise by
changing the
- Original Message -
From: Patrick Lindecker
To: soft_radio@yahoogroups.com
Sent: Saturday, August 25, 2007 7:21 PM
Subject: [soft_radio] Mix the time domain Q I signal with a NCO to make a
near to zero signal
Hello Fred, Alberto and all,
I'm investing an interesting
Cool group with allot of PIC and USB DDS Circuits and controller
softwares.
You can find it at:
http://groups.yahoo.com/group/dds_controller/
Look at the David Brainerd (WB6DHW) DDS/QSD board.
Dan
Actually that is not true with something like a Softrock. You would need
one crystal for each ham band which is not that big of a problem. For a
full coverage receiver a well behaved PLL that went in 50 khz steps
would work.
Johan H. Bodin wrote:
Hi,
yes, a pure and simple XTAL LO would
--- In soft_radio@yahoogroups.com, [EMAIL PROTECTED] wrote:
I think you are confusing the AD9954 with the AD9854. The 9854 has
I and Q outputs with a 12 Bit A/D. The AD9954 has a single output
(lots of options for memory, ramping, etc) and
has a 14 Bit A/D. Less spurs than the 9854, but
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