Hi Folks,
To get complete BC band reception I had Clifton Labs build a custom 800 KHz
low pass filter which I switch in when I tune below 800 KHz. Here is a link
to his web page with a BC band reject filter. I believe he still does
special filters. BTW, I bought the BC band reject filter and it cleans up
my Flex 5000A on 160M.
http://www.cliftonlaboratories.com/z10020_am_medium_wave_band_reject_filter.htm
For below the BC band I use this:
http://www.herostechnology.co.uk/pages/VLF_LF_Converter.html
When I run the 800 KHz low pass filter and the BC band reject filter in
series, the 5000A work very well down to about 350 KHz. Then the images
start showing up. Either switch in the LF converter or buy a couple more
low pass filters, depending on how low you want to receive.
Chuck K1KW
----- Original Message -----
From: <ke...@3950.net>
To: "FlexRadio@flex-radio.biz" <flexradio@flex-radio.biz>
Sent: Wednesday, November 19, 2014 8:35 PM
Subject: [Flexradio] Better broadcast band and longwave reception
Both the SDR-1000 and the Flex 5000 suffer from poor AM broadcast and
longwave reception, with images of BC stations breaking through in many
inappropriate places, especially below 1 MHz.
I have been wondering what others have done to remedy this.
I have considered 1) a preselector/antenna tuner to greatly narrow the
spectrum bandwidth seen by the front end, using my existing inverted L
antenna; 2) a tunable narrow loop antenna; or 3) an upconverter to tune
longwave and AM broadcast at, say, 4 MHz.
I wonder if anyone on the reflector has any wisdom to impart on this
subject.
Thanks,
Kevin.
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