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Which upconverter to buy???

Posted: Sat Apr 22, 2017 2:22 pm
by rzrbax
I have V3 RTL-SDR dongle and would like to get HF. Can someone definitively compare the
various upconverters that I see on Amazon and Ebay? The Ham it Up seems to show up more often
in discussions, but I have reservations about the QC of that product. What about the Hungarian ones?

Many thanks in advance,

Bill

Re: Which upconverter to buy???

Posted: Sat Apr 22, 2017 6:04 pm
by joe36
There are several reviews of up converters here on RTL/SDR.COM.
I personally like the Ham It Up converter. I have had one for a couple years now and could not be happier. The QC was excellent but for me the on board noise source was the determining factor.
If you stay in the hobby any length of time. You will appreciate the noise source.
Joe KA9UCN

Re: Which upconverter to buy???

Posted: Sat Apr 22, 2017 10:57 pm
by AD5NL
Just to be sure -- have you tried Q-branch direct sampling in SDRSharp?

I find that the v3 RTL-SDR.com dongle does a fine job of HF reception on its own, although I'd agree that if you were doing real "work" (ham contesting, receiving WEFAX professionally, etc) an upconverter would be a good idea.

Re: Which upconverter to buy???

Posted: Mon Apr 24, 2017 12:28 am
by rtlsdrblog
The V3 can already receive HF in direct sampling mode.

But if you want an upconverter i'd probably recommend the SpyVerter. The SV can also be powered directly from the bias tee on the V3. Review here http://www.rtl-sdr.com/review-of-the-sp ... pconverter.

Re: Which upconverter to buy???

Posted: Wed Apr 26, 2017 12:49 am
by snn47
Do you want to built the converter yourself or a prebuilt converter. For both you can find information checking the HAM radio publications.

In the SW bands especially around 7 MHz you will most likely have problems due to the large density of strong signals which can produce desensitization, blocking, intermodulation and ...

It depends mainly on what signals and which band you want to receive,
the man made noise at your location,
the antenna type and cable you use (you may need also an antenna turner) and
if you will want to add soon the necessary filter and/or preselector for selectivity, (possibly an attenuator,) by yourself or have it as part of the converter.

The above list of things have to be consired for the use of up converter since the converter itself can be affected by strong signals and large density of signals, and to a lesser degree due to lower sensitivity direct sampling to.

Have fun experimenting
Vy 73

Re: Which upconverter to buy???

Posted: Mon Jun 19, 2017 5:48 pm
by ab1jx
Watch out for the oscillator frequency. I think there's one out there designed such that the output is right in the FM broadcast band. That might work sometimes but it would be a nuisance. I built the one that was in QST. I think the oscillator's 130 MHz, haven't used it in a while.

Re: Which upconverter to buy???

Posted: Thu Jul 06, 2017 7:27 pm
by chuckinnc
Yep, I bought one off ebxx from a seller janilab in Hungary, very well made but 100mhz osc puts 160,80,60,40meter band in the FM radio band 102-107mhz, maybe in Europe this is ok but in USA it's trouble unless you add a expensive FM filter. The best upconverter is by SV1AFN on the xbay, his has the best performance from DC to 50mhz, if your not into elf,lf or mf and only want HF (2mhz) & up then any of the others are ok. I use the upverts with a Ameco II preamp, it amplifies and preselects
1-54 mhz so local oscillator frequency and out of band interference isn't a problem.