FLEX-1500 SDR Datasheet: Are there any filters to eliminate images below 490 KHz?

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  • Updated 3 years ago
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RE: FLEX-1500 SDR Datasheet: page 2, General Specifications, Rx Frequency Range: "490 kHz - 54 MHz (operating below 490 kHz requires external, customer provided filters to eliminate images) 160 - 6 m (specified performance in Amateur bands only)"  Are there any such filters available at retail? Or is it strictly limited to the home brew market? If so, who has them?
Photo of Don Hamrick

Don Hamrick

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Posted 3 years ago

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Photo of Andrew Russell

Andrew Russell

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Don,

I have home brewed simple low pass filters and band pass filters for the 1500 for 660M and 2200M.

http://www.wa4dsy.net/filter/filterdesign.html

http://www.george-smart.co.uk/w/images/thumb/3/3c/472KHz_LPF_Schematic.png/500px-472KHz_LPF_Schemati...

http://www.spirat.com.au/vk5zvs/pic55.htm  

Even 2 stages works well and is easily adjusted with miniature 455kHz transformers.

http://www.qsl.net/aa3sj/Pages/Preselector.html

Commercial options

http://www.kiwa.com/LPF.html

,http://www.herostechnology.co.uk/pages/RF_Filters/filters.html#MiniLPF.

Andrew de VK5CV.
(Edited)