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post #14071 of 14082 Old 05-07-2015, 03:55 PM - Thread Starter
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Quote:
Originally Posted by Trip in VA View Post
And WMDO-CD is now on channel 22...
I'm receiving it just east of College Park, Maryland with a chimney-mounted Winegard PR-9022. It is mapped to 47.1, branded UniMas, and 47.2 is LATV.

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post #14072 of 14082 Old 05-07-2015, 04:38 PM
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TSID is wrong on it too, so my scanner won't pick it up properly.

- Trip

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Comments are my own and not that of the FCC (my employer) or anyone else.

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post #14073 of 14082 Old 05-08-2015, 04:04 AM
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Quote:
Originally Posted by Trip in VA View Post
And WMDO-CD is now on channel 22. It looks like it signed on around 2:30 this afternoon.

- Trip
Wonder why WMDO even bothered switching to RF22? If anything, the coverage area is smaller. I guess a few more people can receive it with rabbit ears than when on 8.
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post #14074 of 14082 Old 05-08-2015, 04:18 AM
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The WMDO signal on channel 8 was being swamped by 50% interference. Remember that when it went on the air in 2008, WGAL had a permit for 7.5 kW, WJLA for 30 kW, and WUSA for 18 kW, and all three were operating as analogs. Now, WJLA and WUSA are both at 52 kW, WGAL is at 59 kW, and all are digitals. Even leaving aside the VHF problem, it was being swamped on all sides by signals much stronger than WMDO and, due to WGAL, WMDO had no ability to increase its own power to compensate.

The signal on channel 22 will be easier to receive on indoor antennas and has no adjacent-channel interference. The nearest signals on channel 22 are also much further away (WRIC Richmond, WNJS Camden).

And once the Incentive Auction is over, presumably WMDO will be able to increase power by up to 10 or 12 dB making its UHF signal much better than the VHF ever was.

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post #14075 of 14082 Old 05-08-2015, 04:31 AM
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I guess it will make sense if they increase power. Never noticed any issues receiving 8 around the immediate DC area with a decent antenna & FM trap.

ATSC tuners are very tolerant of all but the most extreme splatter.
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post #14076 of 14082 Old 05-08-2015, 04:54 AM
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A typical receiver can deal with a power differential of about 30-33 dB between adjacent channels, and the FCC protects stations at the more protective 26-28 dB. The difference between WJLA/WUSA at 52 kW and WMDO-LD at 0.198 kW is 24 dB, assuming line of sight to both. Given how much lower in height WMDO-LD is, terrain will start knocking the WMDO-LD signal down long before WUSA/WJLA get knocked down, meaning large parts of the area were probably in excess of 30 or 35 dB lower.

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post #14077 of 14082 Old 05-08-2015, 05:15 PM
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Originally Posted by doctorwizz View Post
Today I am unable to get channels 5.1, 9.1, 32.1 from DC. Signal show 32 with SNR 14. WTH? It was fine last night.
Ch 4 and 7 show my normal signal strength at 72
3 different tuners have same symptoms.
RCA mast attached preamp go bad?
Could this have been caused by condensation ingress at the coax connectors? The signals seemed to come back when the clouds went away and the sun started shining that morning.
I saw channel 5 signal get low this morning. It was foggy and cars had condensation.
When they installed the antenna, there were no weather boots installed on the connectors at the preamp or the antenna connector.
And I now know that that RCA preamp comes with boots. Aren't they needed?

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post #14078 of 14082 Old 05-08-2015, 06:19 PM
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Possible, if water got into the connections, but reception was screwy this morning anyway due to the tropical weather down south. My WTTG signal was way down this morning due to interference from WITF, I lost WMPT entirely due to WTXF, and I decoded WNJT Trenton, WGAL Lancaster, and WPHL/KYW/WPSG Philly.

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post #14079 of 14082 Old 05-08-2015, 06:23 PM
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Quote:
Originally Posted by Trip in VA View Post
Possible, if water got into the connections, but reception was screwy this morning anyway due to the tropical weather down south. My WTTG signal was way down this morning due to interference from WITF, I lost WMPT entirely due to WTXF, and I decoded WNJT Trenton, WGAL Lancaster, and WPHL/KYW/WPSG Philly.

- Trip
I was getting Some Philly and Landcaster PA stations this morning too in the fog.
I like to look for signals with HD Homerun scanner.


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post #14080 of 14082 Old 05-11-2015, 06:32 AM
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Found this site this morning

http://www.dxinfocentre.com/tropo.html

Is that site useful in signal analyis?

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post #14081 of 14082 Old 05-11-2015, 08:55 AM
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Yes, a useful site to reference when conditions are like we have been seeing the last few days.
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post #14082 of 14082 Unread Today, 06:45 PM
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They must have installed outdoor coax compression connectors to my preamp and antenna. That must be why the boots were not installed. I still wish they were.
I can't imagine they wouldn't use outdoor connectors.

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