[MarioMania]

I hope this is the right place to post it


Is it possible for e-skipping in digital??


I been reading on the Wiki about it & watching youtube Vids on E-skips on Analog TV & Radio

 

[foxfan]

Yes it is possible but extremely rare, as only the low-VHF frequencies (physical channels 2-6 or 54-87Mhz) are susceptible to E-Skip.

 

[MarioMania]

Why is in Analog Ch 2-6 are susceptible to E-Skip?? but not others VHF 7-13 on even on UHF 14-69

 

[dr1394]



Quote:
Originally Posted by MarioMania /forum/post/16837280


Why is in Analog Ch 2-6 are susceptible to E-Skip?? but not others VHF 7-13 on even on UHF 14-69

It has to do with the free electron density in the sporadic E-layer. For the same amount of refraction (enough to bend the wave back to earth), the electron density must increase with increasing frequency.


Because of that, you need very intensely ionized E-skip clouds. This only happens a few days a year on channel 7 (174 - 180 MHz) and maybe one day a year on channel 13 (210 - 216 MHz).


The highest frequency of reported E-skip is the 222-225 MHz amateur radio band. There have never been any reports of E-skip on the next amateur radio band up at 420-450 MHz. Since UHF TV starts at 470 MHz, the chance of E-skip on channel 14-51 is pretty much zero.


Ron

 

[goldrich]

A few hours ago a number of DTV signals via Es were hitting my receivers. At 1316 EDT I briefly decoded KNOP-DT 2, North Platte, NE @ 770 miles. An hour later a brief decode on DT-3, which appeared it might be a PBS station, but no PSIP info, so I was unable to ID it.


Steve

 

[Trip in VA]



Quote:
Originally Posted by goldrich /forum/post/16842395


A few hours ago a number of DTV signals via Es were hitting my receivers. At 1316 EDT I briefly decoded KNOP-DT 2, North Platte, NE @ 770 miles. An hour later a brief decode on DT-3, which appeared it might be a PBS station, but no PSIP info, so I was unable to ID it.


Steve

A PBS on 3? I bet I know who that is ...


- Trip

 

[foxfan]

I once got WCCO-TV 4 Minneapolis MN, KPRY-TV 4 Pierre SD, and KCTA-TV 2 Minneapolis MN on one evening in June 2005.


Unfortunately I've taken down the big low-VHF antenna for a smaller cut-to-channel 13 one so I can't try DX-ing the low-band anymore.

 

[goldrich]



Quote:
Originally Posted by Trip in VA /forum/post/16842458


A PBS on 3? I bet I know who that is ...


- Trip

Trip, that's what I thought at first too, but everytime I turned the big low band VHF ant. toward Roanoke, I lost it. I'm 99% sure it was coming from the west and/or WNW. It appears that some station is not operating with its PSIP. A DXer in Topeka did catch WBRA-DT 3 a few hours ago.


Maybe it's one of the new LD stations from TX or MT. I've logged KXGN-DT 5,Glendive, MT twice this year and it operates with 1 kW.


Steve

 

[gjvrieze]



Quote:
Originally Posted by goldrich /forum/post/16842695


Trip, that's what I thought at first too, but everytime I turned the big low band VHF ant. toward Roanoke, I lost it. I'm 99% sure it was coming from the west and/or WNW. It appears that some station is not operating with its PSIP. A DXer in Topeka did catch WBRA-DT 3 a few hours ago.


Maybe it's one of the new LD stations from TX or MT. I've logged KXGN-DT 5,Glendive, MT twice this year and it operates with 1 kW.


Steve

Could also be a very duct that is stronger because of a reflection in the opposite direction.

 

[foxfan]

The skipped signal doesn't come from the horizon in the direction of where the signal originates (like normal reception). It comes from the sky high above you.


When I was getting stations thousands of miles west of me my antenna was pointing south-east.

 

[dr1394]



Quote:
Originally Posted by foxfan /forum/post/16843120


The skipped signal doesn't come from the horizon in the direction of where the signal originates (like normal reception). It comes from the sky high above you.


When I was getting stations thousands of miles west of me my antenna was pointing south-east.

The elevation angle at which sporadic E signals arrive is just simple geometry based on the height of the E-layer and the radius of the earth.

http://mysite.verizon.net/k9la/siteb...sporadic_e.pdf


For the 770 mile (1240 km) path that goldrich reported, the arrival angle would be around 7 degrees.


Ron

 

[MarioMania]

Thanks for the info...


Can Pocket TV's get e-skips or there to weak??

 

[arxaw]



Quote:
Originally Posted by MarioMania /forum/post/16848084


Thanks for the info...


Can Pocket TV's get e-skips or there to weak??

I once got e-skip of a Schenectady, NY station in Little Rock, Arkansas, on a B/W portable TV with only a monopole antenna.

 

[ChrisPC]

I just got Thunder Bay, Ontario a couple of days ago on analog 2. There was also another 2 with a US infomercial. I think that was a 1kW LPTV in Fargo, ND.

It was the only analog 2 showing infomercials at the time.


My DTT901 was getting weak signals on 2,3, and 4, but they didn't decode.

 

[Nitewatchman]

Have logged 4 U.S. DTV stations via Es here so far, decoding at least a few seconds of Clean Video from all 4 :


6/26/09 at 23:38 UTC - KBSD 6 - Ensign, KS (CBS) - 869 Miles (az 266)


7/7/09 at 23:46 UTC - WABW 6 - Pelham, GA (PBS) - 584 Miles (az 178)


7/16/09 at 16:00 UTC - KOTA 2 - Rapid City, SD (ABC) - 1015 Miles (az 294)


7/17/09 at 18:45 UTC - KCWX 5 - Fredricksburg, TX (CW) - 1033 Miles (az 235) ...


Screenshots via Zenith DTT900 of KCWX and WABW attached .... Don't know why the time/hour info from their STT is apparently wrong for WABW as I didn't get a chance to try to get them via TSreader and see what was in their STT. It worked right for KCWX even though I'm in different time zone , with Zenith DTT900 set for Eastern time (It's EDT currently here of course) ....

 

[ChrisPC]



Quote:
Originally Posted by Nitewatchman /forum/post/16852986


Have logged 4 U.S. DTV stations via Es here so far, decoding at least a few seconds of Clean Video from all 4 :

Nice. The digital transition has made DXing easier than ever.

FWIW, KOTA-DT was the first DTV station ever seen via Es. It seems to be the easiest to catch so far.

 

[MarioMania]

Is there a guied what channels in California that still on the low VHF band 2-6 in Digital??

 

[Desert Hawk]

There is a channel 3 in Eureka California. There is a Spanish language channel 5 in Fresno, but it is moving to channel 11 soon.

 

[MarioMania]

thanks


I got a question for DXers..what kind of antanna do I use to see about getting E-Skips??


I'm using a $20 Radio Sack UHF/VHF Antanna