Архив за 27.02.2019

Off-Topic • Re: SDR Heat Management

Typhoon_MkII wrote:
Wed Feb 27, 2019 8:31 pm
Okay, now I'm in a pinch, but in the other way around.
The fact is that I was planning to buy this house... in Greece.
And because of that, I now have a SDR heat management issue as well, but about overheating this time. What can I do to protect my hardware from the merciless sun of the Mediterranean? I know it's supposed to work "well above" 25 degrees Celsius, but what does that mean? 28? 35? 50 degrees?
In very hot environments, air flow over the metal enclosure is really all you need. And ideally keeping it out of the direct sun.

Statistics: Posted by rtlsdrblog — Wed Feb 27, 2019 10:19 pm


RTL-SDR Discussion • Re: V3 dongle from Amazon

We have a small batch where we've reduced noise on the HF bands, and one of the changes is that jumper. All subsequent batches have the jumper embedded onto the PCB..

But where did you buy that one from? The jumper on that one looks strange

Statistics: Posted by rtlsdrblog — Wed Feb 27, 2019 10:17 pm


Добрый день. Помогите разобраться в причине отсутствия каких-либо сигналов…





2934.97 руб. |Лучшие RTL SDR приемник USB SDR Заглушка с Realtek RTL2832u SDR и Рафаэль micro R820t2
Добрый день. Помогите разобраться в причине отсутствия каких-либо сигналов на КВ. На скриншотах видно, что прием в FM идет отличный, а на КВ полная глухомань! Прием вел на антенну которая шла в комплекте, но пробовал и на рамочную антенну - ситуация никак не изменилась(( Может что-то со стороны настройки данной программы? Помогите пожалуйста!
P.S. SDR-аппарат по ссылке

Off-Topic • Re: SDR Heat Management

Okay, now I'm in a pinch, but in the other way around.
The fact is that I was planning to buy this house... in Greece.
And because of that, I now have a SDR heat management issue as well, but about overheating this time. What can I do to protect my hardware from the merciless sun of the Mediterranean? I know it's supposed to work "well above" 25 degrees Celsius, but what does that mean? 28? 35? 50 degrees?

Statistics: Posted by Typhoon_MkII — Wed Feb 27, 2019 8:31 pm


RTL-SDR Discussion • Re: V3 dongle from Amazon

Sorry, but your two last pics are super blurry, and it's difficult to actually understand what's going on there; do you have other pictures, or is it all what you have since you shipped the item back to Amazon?

Nice user by the way, cool to see fellow warbirds :P

Statistics: Posted by Typhoon_MkII — Wed Feb 27, 2019 7:45 pm


Slow Scan Digital TV(SSDV) activated on the JY1Sat cubesat! You can now receive images with the dashboard software.

Slow Scan Digital TV(SSDV) activated on the JY1Sat cubesat! You can now receive images with the dashboard software. submitted by /u/hipy500
[link] [comments]

Off-Topic • Re: LNA protection from weather

I remember that on one of my first installations, I did the waterproofing in the good ol' gipsy custom way, with a plastic bag held by electrical tape :lol: of course, you shouldn't do that, it's better to do it professionally with appropriate kit as described by rtlsdrblog.

Statistics: Posted by Typhoon_MkII — Wed Feb 27, 2019 6:55 pm


LNA is not helping on a long coax run. Am I doing something wrong?

Here's my setup:
Discone>6ft coax (50ohm)>RTL-SDR.com Wideband LNA>50 ft coax (75ohm)>box outside to inside coax> some amount of coax run in the walls to get it to my office>Airspy R2

HF and VHF comes in great, but as expected, losses got greater as the frequency increased, so I added the LNA. Thing is, it seems to have no effect whether or not I enable the LNA via the Bias-tee in the Airspy or not. The signals seem to not change at all.

I've checked the voltage at the SMA connector that would screw into the LNA and was getting 4.51v, so exactly where it should be. I did use that LNA inside connected to a much smaller antenna before I got an external enclosure for it, and the LNA worked well.

So, am I missing something? I expected there to be loss on the coax, and a tiny bit of loss going from 50 to 75ohm, but everything I've read seems to indicate that an LNA will make things much better. Instead I'm seeing basically no difference at all, or at least none that I can really see. I expect putting a RaspPi in the box with the LNA and using SpyServer is the real solution, but not all of the programs I'm using support the SpyServer, most notably SDRTrunk.

Anyone have a suggestion?

submitted by /u/Fazaman
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Что за чудо сигнал ? Кто знает…


Что за чудо сигнал ? Кто знает

Help with NOAA satellite (using prebuilt V-Dipole)

I'm not recieving any data or signal and I've tried many a times. I can recieve other stuff like radio and ADS-B (with different antenna configurations), but when following the procedure (54cm leg length, 120° between them and open end south) I can't receive any signal. It's just static noise in audio and waterfall is filled with static, yellow/orange in color, like it does on frequencies where nothing is being broadcasted.

I tried twice on my "balcony" (I live on top floor of an apartment, and by balcony I mean the surrounding empty space), which is covered by walls on south, approx 10-15° and other walls on other sides which cover 5°.

Any idea why I'm not recieving any signal?

submitted by /u/OneRandomGhost
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