Bob,
I listen regularly to signals below 500 khz, including many airport beacons
as low as 200 khz. I made a low pass filter for 500 khz and it completely
removed all the broadcast band signals. Direct conversion receivers will
receive signals quite well at all the multiples of the tuned frequency. If
you are tuned to 300 khz, you will receive 600 khz, 900 khz, 1200 khz, and
so on quite well. The fix is to install a low pass filter that cuts off at
something less than the times 2 frequency. The F5K has built in low pass
filters for each ham band to solve this for the ham bands. The receive loop
built into the F5K is the perfect place to install this filter.
This is the link for the filter I built.
http://www.qrp.pops.net/ndb.asp
Carl Moreschi N4PY
121 Little Bell Drive
Hays, NC 28635
www.n4py.com
----- Original Message -----
From: "Robert delaney" <ka9...@hotmail.com>
To: "FLEXRADIO" <flexradio@flex-radio.biz>
Sent: Sunday, March 14, 2010 8:15 PM
Subject: [Flexradio] Flex 5000a RX below 550 Khz
I want to thank everyone who replied to my question about the Flex 5000
reception below the broadcast band.
Unfortunatley there seems to be a pretty big difference in opinions about
this so I am going to try and build or purchase a filter to see for myself
if this radio can RX there or not.
I just planned to do some casual listening down there and I am not
expecting SUPER performance in that part of the spectrum. I am however
expecting equal performance to my TS2000X down there.
Thanks again to All who Flex their muscle here to help out us newbies.
73, Bob
KA9UVY
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