Robert, I see the same thing on my SDR-1000 without any filtering. I
insert my two filters and 99% of the images disappear like magic, and
there are the beacons.
BTW, PowerSDR NB and NB2 do a wonderful job of getting rid of all the
buzzing down in the LF region.
Oh and for others reading this...I notice that in the Setup menu under
General -> Options there is a check box for "Enable 300khz Filter". Did
Flex at one time or another offer an on board LF filter for the
SDR-1000? I notice that when I check the box the radio goes very deaf
below 300 KHz..
Thanks,
Jerry Sharp, KD0GS
Robert delaney wrote:
Jerry, Thank you for the information about the Flex 1000 and it's
performance when a filter is added.
I am a bit concerned though with the Flex 5000. When tuning this area
of spectrum you will see all of thebroadcast images and then when you
pass a certain frequency the whole panadapter suddenly almost magically
changes to a new set of images.
I can not hear any beacons under the QRM at all just spike after spike
of AM stations that aren't really there.
73, Bob
KA9UVY
----- Original Message ----- From: "Jerry Sharp" <gerf...@mesanetworks.net>
To: "FlexRadio" <FlexRadio@flex-radio.biz>
Sent: Saturday, March 13, 2010 11:29 PM
Subject: Re: [Flexradio] Flex 5000a RX below 550 Khz
Bob, like Dudley mentions, you'll need a low pass filter that cuts off
at 400-500 KHz. In fact, I run two in series to keep all the broadcast
junk out.
Every radio I've even owned that tuned below 500 KHz worked the
same...all kinds of BCB "junk" unless you add a filter, including my
Drake R8, Drake TR7, and Yaesu FT-847.
Right now I'm running a short 36" active antenna for LF into my
SDR-1000 (with of course the low pass filters in line). From Colorado
in the winter I have copied non-directional beacons from South and
Central America, Greenland, and the South Pacific. I've also copied
several 1 watt Lowfer experimental stations in the 170-190 KHz range
from across the USA.
The panadapter is ABSOLUTELY WONDERFUL for spotting extremely weak LF
and VLF CW signals! And my SDR with low pass filters is by far the
finest receiver I've ever owned for LF and VLF!
73,
Jerry Sharp, KD0GS
Dudley Hurry wrote:
Bob,
You will need a low pass filter of the range you are planning to use.
Many have report good results with a 500 khz cutoff low pass or you
can build your own..
73,
Dudley
WA5QPZ
Robert delaney wrote:
I seem to have nothing but images of the AM broadcast band on my
5000A when looking for non directional airport beacons between 150
and 500 Khz.
Has anyone else noticed this image issue? I understand that the
radios specs are for the ham band but I thought it would at least RX
down there.
Thanks, 73
Bob
KA9UVY
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