Архив за 10.12.2017

Comment on SDRplay Release the RSP1A: A $99 14-bit 1 kHz to 2 GHz Revision of the RSP1 by marketing

> (-12 dBM) but still 80 dB over the noise

That’s actually very poor. This means normal signals nearby at -100 dBm are wiped away?
Did I say infinite supply of idiots? HAHA!

@radiolielectronica Обработка сигнала SSTV c МКС/ISS програмой Robot 36…

Обработка сигнала SSTV c МКС/ISS програмой  Robot 36

Обработка сигнала SSTV c МКС/ISS програмой Robot 36 (00:02:03)

#радиосвязь@radiolielectronica
Обработка сигнала SSTV c МКС/ISS програмой Robot 36

Comment on SDRplay Release the RSP1A: A $99 14-bit 1 kHz to 2 GHz Revision of the RSP1 by Tech Guy

> The tuner with integrated tuneable filter does not exist either.

I see you still didn’t do your homework. There’s at least 15 years between the release of Mirics and these other tuners. In these 15 years of RF innovation, things like N-Path filters were invented and integrated in virtually everything that has a radio receiver, from bluetooth, cell-phones, wifi to portable radios… but not in the Mirics tuners – which is unfortunate for the hobbyists.

PS: I was serious about the homework thing.

Comment on dopplerscript: Getting Doppler Updates from GPredict into GNU Radio by Tomatos666

It dosn´t work.I recieve no Pic´s.
I use a RTL Stick what work on the Noaa Satelites.

Comment on SDRplay Release the RSP1A: A $99 14-bit 1 kHz to 2 GHz Revision of the RSP1 by oldjackbob

And here’s a shot of BCAM feeding straight thru from my 80/40 dipole to the RSP1A, no attenuation at all (normally I go thru my legal limit tuner set for 80 meters which attenuates MW somewhere between 20-30 dB)):

https://drive.google.com/open?id=1Y6uTghDkdUIA1hEnc2CZpwUjA1FapnNr

The signal at 820 AM is extremely strong (-12 dBM) but still 80 dB over the noise. And notice the RF (MW/FM) Notch filter (top of screen) is “Off” so there’s no filtering either, just hell-for-stout signal feeding straight into the tuner front end.

And the RSP1A is handling it just fine. Just look at that screen. Beautiful. Not a hint of overload anywhere.

To say I’m pleased with my RSP1A would be an understatement.

Gonna go ride my mountain bike now (I do all my own stunts, look out!).

Comment on SDRplay Release the RSP1A: A $99 14-bit 1 kHz to 2 GHz Revision of the RSP1 by marketing

You don’t seem to have a clue. Are you, by any chance, confusing in-band and out-of-band DR? FYI. Any low cost radio will survive a single 80 dB signal, including RTL-SDR’s. Plug a real antenna with a lot of strong signals and you will see all your dreams fall apart, like it still happens with all the RSP based radios.

Of course, if you are happy with your toy, you should keep using it – just don’t make a fool of yourself by exposing your ignorance.

SDRPlay definitely succeeded in building a community of clueless idiots. But how bad can it be? There’s an infinite supply of them in the Internet.

Comment on Instructions for Building a Portable Double Cross Antenna: Great for NOAA/Meteor Weather Satellites by Steve Ziegler

Could this design be adapted for the 1676 MHz freq range to monitor weather balloons from the National Weather Service?

Comment on SDRplay Release the RSP1A: A $99 14-bit 1 kHz to 2 GHz Revision of the RSP1 by oldjackbob

My question wasn’t really what can the HF+ do that the RSP1A can’t, but rather why I should regret my purchase, because there’s nothing I need an HF SDR receiver to do that my RSP1A can’t do as well as any other receiver.

I’ve put the challenge out for anyone to post a screenshot of an 80 dB-over-noise signal, but crickets were all that abound. Well, here’s a screenshot of multiple 80+ dB BCAM signals in the same bandslice (a much bigger slice than an HF+ can grab, btw), and my RSP1A handles that just fine:

https://drive.google.com/open?id=1PDamb7jVGhPobnUdkjZa8BYVq54u4P6q

For the record, I waited patiently for a long time to capture that snapshot.

But wait, there’s more. Here’s a signal at a solid 85+ dB-over-noise:

https://drive.google.com/open?id=1Nr0j5gcYqjNlWJiQceW_T0xeHj1I0oKV

I’m not even gonna tell you how much time I wasted looking for that one. 🙂

So this is my statement to all the trolls attacking the RSP1A: The radio does a damn fine job of MW/HF reception, as good a job as anything else that anyone else can offer. What good is an advertised 110+ dB of dynamic range when there’s no real life signal out there that even comes close to that level? Any SDR receiver that brags about that much DR as its main selling point (especially at the expense of receive bandwidth and spectrum coverage) is simply taking advantage of the ignorance of the buyer.

Comment on XTRX: Soon to be crowdfunding Mini PCIe based TX/RX SDR by Alexander Chemeris

I’m not sure those antennas will be optimal for 300-900 MHz band as most of the cellular bands are >850 MHz (for GSM) or >700 MHz (for LTE). That said, while not optimal I think you should be able to receive. You’ll have to experiment, though.

Comment on SDRplay Release the RSP1A: A $99 14-bit 1 kHz to 2 GHz Revision of the RSP1 by Juanro

For Tech Guy: Oh yes, all the tuners mentioned are so modern (including the RSP1A) that they still need filters at the entrance to avoid intermodulation. What you say does not exist yet. The tuner with integrated tuneable filter does not exist either.

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