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5G support

5G support submitted by /u/promach
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New monitor, unwanted side effect.

https://imgur.com/a/710ilJP

right in the centre of the marine band and business radio.

upgraded from an old dual dvi monitor to a gaming one (Asus MG278Q) on displayport.

submitted by /u/starvaldD
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GOES 16 woes continue…

GOES 16 woes continue...

Second attempt at receiving images from GOES 16 here, using raspberry pi running goestools. After my last attempt was foiled by an issue with the bias tee of my SDR that resulted in the LNA not being powered, I was hopeful that I would get an image this time. Firing up goestools, my viterbi error rate never went below 2000, indicating no signal. However when I connected the SDR to my laptop and ran CubicSDR, the waterfall showed a clear (perhaps weak) signal at the 1.68 GHz range when pointed at the satellite's approximate location:

Definetely something

https://i.redd.it/r6udbey8whb21.png

Which dissapeared when not pointed at GOES, ruling out interference

Despite not changing antenna positioning at all between running goestools and the waterfall, the latter clearly (I believe) showed some reception from GOES. My question is how is it possible to then not be getting a single packet or drop in vit rate? I don't see where there could be a fault in the hardware (in case it was my Pi I tried running goestools on a linux machine, no luck), and I find it hard to believe it's the software. Or was the signal just too weak? Thanks in advance for any ideas/help, this project is fascinating and frustrating at the same time!

submitted by /u/drwhoxenon
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Automating Goestools on Pi?

I've been trying all night to get goesrecv and goesproc to run on my pi via crontab so i dont need to login via ssh and start it every time.....

no success so far...

has anyone setup their Pi to run goestools without having to execute the commands via ssh?

banging my head against a wall here ;)

i've tried this

@reboot /usr/bin/goesrecv -v -i 1 -c /home/pi/goesrecv.conf > /home/pi/goesrecvlog.txt

@reboot /usr/bin/goesproc -c ~/goesproc-goesr.conf -m packet --subscribe tcp://127.0.0.1:5004 > /home/pi/goesproclog.txt

and I can see goesproc in the running processes after rebooting, but goesrecv isnt there (a problem, obviously) and there's no output in either of the files.

can anyone point me in the right direction?

or does anyone automate goestools a different way?

submitted by /u/quartapound
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troubleshooting goesrecv

hi, I built a setup according to this. After the first few seconds, my packet drops are consistently at 10-13. I've adjusted the antenna back and forth, up and down, and my vit doesn't get much better than what shows below. I've tweaked the gain and sample rate without any luck. Any advice? Thanks in advance!

Jan 19 23:52:18 raspberrypi goesrecv[1913]: Found Elonics E4000 tuner

Jan 19 23:52:19 raspberrypi goesrecv[1913]: Disabled direct sampling mode

Jan 19 23:52:19 raspberrypi goesrecv[1913]: [E4K] PLL not locked for 0 Hz!

Jan 19 23:52:19 raspberrypi goesrecv[1913]: Exact sample rate is: 2000000.052982 Hz

Jan 19 23:52:19 raspberrypi goesrecv[1913]: Allocating 15 zero-copy buffers

Jan 19 23:52:20 raspberrypi goesrecv[1913]: 2019-01-19T23:52:20Z [monitor] gain: 6.73, freq: -333.8, omega: 2.157, vit(avg): 944, rs(sum): 111, packets: 16, drops: 15

Jan 19 23:52:21 raspberrypi goesrecv[1913]: 2019-01-19T23:52:21Z [monitor] gain: 4.44, freq: -619.0, omega: 2.157, vit(avg): 868, rs(sum): 317, packets: 29, drops: 12

Jan 19 23:52:22 raspberrypi goesrecv[1913]: 2019-01-19T23:52:22Z [monitor] gain: 2.94, freq: -665.3, omega: 2.157, vit(avg): 237, rs(sum): 217, packets: 44, drops: 0

Jan 19 23:52:23 raspberrypi goesrecv[1913]: 2019-01-19T23:52:23Z [monitor] gain: 2.94, freq: -621.2, omega: 2.157, vit(avg): 241, rs(sum): 206, packets: 44, drops: 0

Jan 19 23:52:24 raspberrypi goesrecv[1913]: 2019-01-19T23:52:24Z [monitor] gain: 2.94, freq: -644.7, omega: 2.157, vit(avg): 239, rs(sum): 189, packets: 42, drops: 0

Jan 19 23:52:25 raspberrypi goesrecv[1913]: 2019-01-19T23:52:25Z [monitor] gain: 2.94, freq: -605.1, omega: 2.157, vit(avg): 236, rs(sum): 210, packets: 44, drops: 0

Jan 19 23:52:26 raspberrypi goesrecv[1913]: 2019-01-19T23:52:26Z [monitor] gain: 2.94, freq: -559.4, omega: 2.157, vit(avg): 328, rs(sum): 204, packets: 40, drops: 2

Jan 19 23:52:27 raspberrypi goesrecv[1913]: 2019-01-19T23:52:27Z [monitor] gain: 2.94, freq: -723.6, omega: 2.157, vit(avg): 347, rs(sum): 108, packets: 20, drops: 12

Jan 19 23:52:28 raspberrypi goesrecv[1913]: 2019-01-19T23:52:28Z [monitor] gain: 2.94, freq: -624.2, omega: 2.157, vit(avg): 497, rs(sum): 116, packets: 22, drops: 12

Jan 19 23:52:29 raspberrypi goesrecv[1913]: 2019-01-19T23:52:29Z [monitor] gain: 2.94, freq: -563.3, omega: 2.157, vit(avg): 402, rs(sum): 100, packets: 22, drops: 11

Jan 19 23:52:30 raspberrypi goesrecv[1913]: 2019-01-19T23:52:30Z [monitor] gain: 2.94, freq: -653.3, omega: 2.157, vit(avg): 430, rs(sum): 103, packets: 21, drops: 12

Jan 19 23:52:31 raspberrypi goesrecv[1913]: 2019-01-19T23:52:31Z [monitor] gain: 2.94, freq: -635.4, omega: 2.157, vit(avg): 406, rs(sum): 129, packets: 22, drops: 11

Jan 19 23:52:32 raspberrypi goesrecv[1913]: 2019-01-19T23:52:32Z [monitor] gain: 2.94, freq: -594.9, omega: 2.157, vit(avg): 387, rs(sum): 108, packets: 21, drops: 13

Jan 19 23:52:33 raspberrypi goesrecv[1913]: 2019-01-19T23:52:33Z [monitor] gain: 2.94, freq: -593.5, omega: 2.157, vit(avg): 366, rs(sum): 97, packets: 20, drops: 12

Jan 19 23:52:34 raspberrypi goesrecv[1913]: 2019-01-19T23:52:34Z [monitor] gain: 2.94, freq: -614.0, omega: 2.157, vit(avg): 427, rs(sum): 107, packets: 23, drops: 11

submitted by /u/JoshWithaQ
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Powering Devices with Bias Tee power

Hi! Using a bias tee as a power injector seems straight forward. However, I can't seem to find an answer as to how to remove the injected power to operate a device.

For example: I am injecting power into a cable using a bias tee which feeds into this LNA. There are three ports on the LNA: RF in, RF out, and DC in. How do I get the injected power to the DC in port of the LNA?

Does it require using another bias tee connected in reverse??? Thank you!

submitted by /u/prototagonist
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Question about GOES CIRA Geocolor…. Am I ever going to get realtime nighttime city lights?

So, I recently got my GOES 16 rig working.

Most of my inspiration came from THIS post from a few months ago, which showed a composite made from day/night shots that included city lights... I thought the night time city lights were awesome (twice as much viewing -- you can see interesting stuff at night, besides the IR channels).

I was disappointed when I didn't find that imagery among the captured channels.

I went back to the post, and read in the comments that he used CIRA geocolor to generate the images.

I found THIS page describing it...

here's a quote from the site:

The main caveat users must always be aware of when using this product is that the backgrounds (ie, the Blue Marble and NGDC nighttime city lights) in the current GeoColor product are static. As such, almost all dynamics pertaining to the background will not be captured in this product. Unless some aspect of the change is captured in the real-time GOES visible/infrared observations, it will not be represented. For example, seasonal changes in vegetation, power outages, river plumes, variation of nighttime land brightness with lunar phase, etc, or impacts from a natural disaster, may not be represented in real-time imagery produced from this method. Examples of backgrounds that will be detected are snow cover and sea ice during the daytime, which will manifest as bright targets in the current GOES imagery. Although technically part of the 'background' since they are not atmospheric features, they will be revealed in the GeoColor imagery due to their high reflectance in the GOES daytime visible channel imagery. For an example of poor performance due to static backgrounds, the city lights of New Orleans appeared to shine brightly the night after Hurricane Katrina’s passage over the city.

When this product is available in the actual GOES-R era, the backgrounds will be available more often because of the instruments on the NPOESS satellites. Specifically, the backgrounds will be produced more often and at higher fidelity by the Visible/Infrared Imager/Radiometer Suite (VIIRS) sensors (which include the Day/Night Band for nighttime lights). More frequent updates will enable the capture of some of the dynamic background components that were mentioned previously—improving its representation of all components of the scene. As for the nighttime side of GeoColor, the GOES-R ABI provides 'low light' sensitivity, but the light levels in this case refer to twilight conditions as opposed to natural/artificial terrestrial light emissions and lunar reflection light levels several orders of magnitude fainter.

so.... unfortunately there is no nighttime citylights right now... or ever, coming from GOES.... and those images are coming from NPOESS satellites and the image is overlaid.... and static.

So.... I'll never get (near) real-time nighttime lights?

:( disappointing... THIS beautiful image posted a few months ago is inspiring, but somewhat misleading. (not that OP hid anything)

submitted by /u/quartapound
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So I got my v-dipole just about working… apart from this damn repeating interference

So I got my v-dipole just about working... apart from this damn repeating interference submitted by /u/deadawakeuk
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HS HD hdb

submitted by /u/daanwessels1
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Rtlsdr basics

Hi all

I recently accquired an rtlsdr.

Ive been able to pick up AM and FM radio stations, but am stuck as to where to go next.

I need a bit of guidance as to how I can pick up UHF frequencies to listen to truckers talk or how I can listen to the fire/police/ambo frequencies available.

I'm in Sydney Australia.

Does anyone have a guide or good references I can refer to? I seem to be finding a bit of it over my head.

Appreciate any advice or direction :)

submitted by /u/dimsim86s
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