E4000 vs. R820T ?!

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Your_account

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Elonics E4000 52 - 2200 MHz with a gap from 1100 MHz to 1250 MHz (varies)
Rafael Micro R820T 24 - 1766 MHz
Fitipower FC0013 22 - 1100 MHz
Left E4000 Rite R820T:


The same Antenna. So what happend which the R820T?
That look total crazy to me. The Same frequency and time.
Does i use the wrong driver?

And i both 10 Dongle white the FC0013 and i cant receive anything white RTL1090.
 

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br0adband

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All I can say is this: if you own an Elonics E4000 based device, consider yourself lucky and don't let it go because they're quite rare these days, and when they do exist they're quite expensive by comparison.

As for why the massive difference there, I have no idea. If I had to guess it looks like the R820T stick has the Tuner AGC enabled for maximum sensitivity which I rarely if ever use myself, I typically leave the RTL AGC enabled and keep the RF Gain between 20.7 and 28 which works best for me in most any reception (save for extremely overloaded ones which I experience with several 460 MHz repeaters only a few blocks away from me for casino-hotel comms).
 

Boatanchor

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In my experience, the 820T devices are very 'gain sensitive'. If the gain control is set too high, you will get a response like that with lots of noise and few if any receivable signals.

Try turning the gain down and see if the noise disappears.

The RTL devices are pretty crude really. I have both of those dongles and a FunCubeDongle pro+. The RTL devices don't come anywhere near close to the performance of the FCDP+.
The only reason I retain the RTL devices is that the FCDP+ is limited to a received bandwidth of only 196Khz, so no good for ADSB etc.
 

tylerwatt12

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100% gain slider is equal to 37dB gain on the R820t's. They have a lot more room to work, but the problem is it gets overloaded easily.
 

fourthhorseman

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All I can say is this: if you own an Elonics E4000 based device, consider yourself lucky and don't let it go because they're quite rare these days, and when they do exist they're quite expensive by comparison.
Do you know why they are up in cost?..iI got mine for 10$ shipped..about a year ago..now I see them for 40..WOW...
 

Your_account

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Does anybody want an E4000 dongel?
I can get ~25 for 17€/ each.
 

br0adband

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Do you know why they are up in cost?..iI got mine for 10$ shipped..about a year ago..now I see them for 40..WOW...
Elonics is no longer in business, that's pretty much the reason - there will be no more E4000-based tuners made so, the supply that exists right now (and for the past 6 months or so) is all that's left hence the rather dramatic price increases for those specific devices.

I'm happy with my "lowly" R820T devices so far: predictable performance, noise floor is consistent, once warmed up and tuned they work just fine for me. I can't see any reason I'd care for the increased frequency coverage of the E4000-based devices myself: I don't monitor SWL or HF content, never cared for it, and there's nothing I care about in the upper ranges above 1 GHz that I care about either. Was looking into 1090 MHz coverage with my current devices and mucking around with ADS-B stuff but, then I realized FlightRadar24.com exists and I can get the same basic info from there so... ;)

Your_account: Wow, if you can manage to get so many at such a (relatively) cheap price, you might as well grab 'em yourself and resell 'em for some profit. As long as they're actual E4000-based products you should have no issues reselling them at all.
 

nermel

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I purchased an E4000 in August on eBay for ~$22 , was rather happy. A few weeks ago, I purchased an R820T from NooElec.for about the same price (Didn't feel like paying ~$50 for an E4000). I have had some time to compare the two. The E4000 is better for VHF, 460MHz and broadcast FM reception. I use the two dongles mostly for 850MHz trunking (EDACS ProVoice). There, both seem to behave fairly equally. Except, the R820T seems to work a little bit better when passing the audio to DSD. For 950MHz STL reception, the R820T performed better. As far as ADS-B reception, the R820T blows away my E4000. One downside, the antenna for the R820T is *very* flimsy and the connector it uses isn't too common.

Unless you have a very specific need for what the E4000 can receive, the R820T is by far the better value.
 
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