QST: Blog Of K3RRR

Signal-to-Noise Ratio

Definition of the signal to noise ratio (SNR) and simple computations with it. More instructional engineering videos can be found at http://www.engineeringvi…
Video Rating: 4 / 5

November 21, 2014/22 Comments/by

22 replies

Grozdana Erjavec says:
November 22, 2014 at 1:55 AM

Thank you for the video! It’s very useful!
Reply
jagruti purohit says:
November 22, 2014 at 1:25 AM

just out of interest have you heard of the word “enthusiasm”?
Reply
saleh handhal says:
November 22, 2014 at 1:10 AM

it is rather systematic
Reply
radagasp says:
November 22, 2014 at 12:12 AM

Darryl, this was really great- thank you.
Reply
Bill Hall says:
November 21, 2014 at 11:12 PM

great stuff and very very helpful in studying for my PE!
Reply
Smiler Liverpool says:
November 21, 2014 at 10:36 PM

Many thx 😀
Reply
Darryl Morrell says:
November 21, 2014 at 9:37 PM

This is my enthusiastic mode. You might find it helpful to play the videos
back at 1.5 or 2 times actual speed.
Reply
Ivan A says:
November 21, 2014 at 8:57 PM

Thanks.
Reply
Smiler Liverpool says:
November 21, 2014 at 8:22 PM

No i prefer the speed your going at!!
Reply
irfaanfr4 says:
November 21, 2014 at 7:44 PM

Thnks!
Reply
Enrique Romero says:
November 21, 2014 at 6:51 PM

I’m gonna have to say play it back at 20 log 10(zzzzzzzz)!
Reply
EzzAldeen says:
November 21, 2014 at 6:31 PM

Thank you for the video
Reply
MaxPower1366 says:
November 21, 2014 at 6:14 PM

Thanks for the helpful video!
Reply
AlbertBjakocs says:
November 21, 2014 at 5:34 PM

tackar ödmjukast
Reply
Mygaffer says:
November 21, 2014 at 5:03 PM

Great info, thanks for uploading the video. I dropped out of college when
some personal problems came up but I love to learn new things. Thanks for
teaching me something new.
Reply
Alfredo1987a says:
November 21, 2014 at 4:11 PM

I fell asleep
Reply
Amirul Afiq says:
November 21, 2014 at 4:07 PM

Such a great lullaby to fell asleep
Reply
Brent Ellison says:
November 21, 2014 at 3:33 PM

Thanks for posting this…very interesting info and to the point of how it
is calculated or used.
Reply
ANKIT TRIPATHI says:
November 21, 2014 at 3:24 PM

Very Slow and trivial matter by the way.
Reply
Justin Bowker says:
November 21, 2014 at 3:06 PM

Thanks
Reply
Puneet Srivastava says:
November 21, 2014 at 2:25 PM

excellent explanation
Reply
Agustin Cesar says:
November 21, 2014 at 2:14 PM

Newbie question, how do I know, by using the SNR that my cablemodem shows
on the modem webpage, if I have too much noise or little noise? for
instance, I see that it says something about 36dBm in the SNR marker, does
that mean that I am getting more signal than noise? By using google I have
learned that there is a SNR for the signal on the coaxial cable, that can
be affected by cable quality, splitters, installation, bla bla bla. What I
want is to know if my installation is affecting the cable modem ability to
get good signal and therefore good speeds.
Reply

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Name, QTH, Grid:

My name is Robert and I currently live in Killeen Texas about 40 miles north of Austin in EM11db.

Grid Map shows my location and the other 26 hams in my sub grid. Click for bigger photo.

Rigs / Antennas / Etc.:

Here’s a list of my very modest station at Kilo Three Triple R with links to pages with more information about many of the items (coming soon!):

Home Station: Icom 9700 for Satellites and D-Star and VHF/UHF. Icom 7300 for all things HF including mostly FT8! Icom 705 for HF, DSTAR, portable and mobile operations.
Antennas on HF: 135′ EFHW antenna – 80m through 10m at 40′. 65′ EFHW antenna – 40m through 10m at 35′. 6m dipole at 17’made from leftover BuddiPole parts
VHF / UHF / Beyond: Diamond D-130 Discone antenna with 25-1300 MHz coverage at 20′.
Satellite Antenna Array: AMSAT LEO Pack 16 element 436 MHz 436CP16 and 8 element 144 MHz 2MCP8A with AZ / EL Yaesu G-5500 computerized rotator with Fox Delta ST-2 controller.
Antenna for Portable Satellite: Handheld Elk 2M/440L5 Dual-band Log Periodic antenna (used with ICOM 705, Kenwood TH-D74a or BaoFeng UV-5R.)
Mobile Station: For HF, my Icom 705 has shared custody between my Subaru Forster SUV and my home shack. This gives me all mode / all bands 160m – 70cm mobile rig as needed that includes D-STAR, touch screen and waterfall. HF antenna is a 40-10m Wolf River Coils Silver Bullet Mini with a Diamond dual-band antenna for VHF/UHF. I also use my Kenwood TH-D74a which does surprising well as a mobile radio using the same Diamond dual band antenna – with the added benefit of also having DSTAR and APRS. Likewise, I use my Anytone 878 UV Plus DMR radio. The mobile setup also includes a dedicated mobile openSPOT3 hotspot for DMR that allows transcoded operations for any of the three radios – I am usually on the AMSAT, WW 91 or Nationwide talkgroups on DMR and for D-STAR where I usually hang out on 30C or 1C.
HT: Kenwood TH-D74a added to the shack for 144, 220 and 440 amateur bands D-Star, broadband receive, etc. / Anytone 878 UV Plus radio and a BaoFeng UV-5R (3 of them with 2 in the Faraday Cage.) 136-174/400-480 MHz Dual-Band – BaoFeng is mostly for monitoring and throwaway high-risk operations.
Other: Dual LDG Z-11 Pro II Autotuner for both home QTH EFHWs – And Elecraft T-1 for portable operations with my ICOM 705. I am also the happy owner of the amazing Joplin Amateur Radio Club Antenna Launcher.
SDRs: SDRplay RSP2 and Three NooElec RTL2832U USB Sticks – used with the wideband Diamond discone antenna.
Computers: Main Computer: Homebrew Eight Core, 16 Thread i9-11900 @ 5.3GHz / 64 GB RAM — Ham Radio Computer: Six Core, 12 Thread i7-8700 @ 3.7GHz / 48 GB RAM— Triple monitors: Main 65″ LG 4K HDTV with dual 43″ 4K Sceptre HDTV – Apple iPad Pro.
Software: Windows 10 x64 / PstRotator for Sat Tracking, Rotator control and rig control / Ham Radio Deluxe / Digital Master 780 / HRD Logbook / WSJT-X for FT8 with JTAlert / UZ7HO Soundmodem Software Packet-Radio TNC, etc. / UISS for ISS and APRS contacts / etc. etc. etc.

Interests:

Everything! Including my Wonderful Wife Jan (absolutely my #1 favorite way to spend my time), digital photography, mountain hiking, sailing, biking, scuba diving, computers, writing, helping startup companies start and stay started and, of course, for fifty-nine years, ham radio!

Previous Calls:

WN4LEJ – Novice
WA4YFH – General
WB5KFI – Advanced
KD5SB – Advanced
AA5FR – Extra

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Seen Any Bad Links, Missing Photos, Typos, Etc.?

I'm in the process of migrating my old AA5FR.com site to this new site to reflect my new K3RRR.com call sign. As I go through the process, I am also developing several new pages that describe my current antennas and other things of interest such as EMP threats.

If you see any problems with bad links, bad grammar, missing photos, typos, any stupid errors, etc., I would greatly appreciate your reporting those to me so I can fix them ASAP.

Also, any other thoughts, ideas, etc. are also always appreciated!

Just click on my eyeballs below!

73 de Robert

Signal-to-Noise Ratio

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