Why no cheap 2-3 ghz sdrs?

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jasontaylor7
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Why no cheap 2-3 ghz sdrs?

Post by jasontaylor7 » Wed May 28, 2014 5:39 pm

I am new to sdr. I need to make some measurements of a microwave oven, which operates at 2.4 ghz. I see I need to get a cheap sdr that goes to 1.7ghz and buy an expensive downconverter.

However, seems I could also preorder a bladeRF https://www.kickstarter.com/projects/10 ... adio/posts that can tune from 300MHz to 3.8GHz without the need for extra boards, or a hackrf http://greatscottgadgets.com/hackrf/ that can do 10 MHz to 6 GHz. I don't need to transmit and don't have a usb 3.0 machine. And why are these so expensive? Do they require more expensive software to model the rf losses above 2 ghz? What are the main reasons that I can't purchase something as cheap as the e4000 or r820t to do the job?

Jason
http://jasontaylor.us
Last edited by jasontaylor7 on Thu May 29, 2014 2:18 am, edited 1 time in total.

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Re: Why no cheap 2-3 ghz sdrs?

Post by rtlsdrblog » Thu May 29, 2014 12:49 am

Main reason is that the RTL-SDR (e4000, r820t) is an SDR by accident. They're cheaply mass produced in China for a massive world market for watching DVB-T Digital TV. Some clever third parties hacked the dongle and found it had an SDR mode that could be enabled in software and here we are.

HackRF and BladeRF are designed and built as high quality SDR's from scratch. SDR is a niche market so demand is much lower and prices are higher. Also HackRF and BladeRF are designed much more carefully to give much better performance.

BTW, the downconverters aren't *that* expensive, you can find them for around $10-$20 + $10 shipping on aliexpress, search for MMDS downconverter.

Also bladeRF is already available for purchase on their site.

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jasontaylor7
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Re: Why no cheap 2-3 ghz sdrs?

Post by jasontaylor7 » Fri May 30, 2014 4:12 pm

Thanks for your reply, but, IMO, your explanation would not explain a 4,000% difference in price. It would explain a 200% difference, perhaps.
rtlsdrblog wrote:BTW, the downconverters aren't *that* expensive, you can find them for around $10-$20 + $10 shipping on aliexpress, search for MMDS downconverter.
Thanks for this info, but I am confused, since there are no hits:
Image

Thanks again for your reply.
Sincerely,
Jason

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Re: Why no cheap 2-3 ghz sdrs?

Post by rtlsdrblog » Sat May 31, 2014 12:01 am

Not sure why you're not seeing results, I get 136 results. Here is one example http://www.aliexpress.com/item/brand-ne ... 33899.html.

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