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post #14071 of 14089 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 14089 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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post #14073 of 14089 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 14089 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 14089 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 14089 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 14089 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 14089 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 14089 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 14089 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 14089 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 14089 Old 05-13-2015, 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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post #14083 of 14089 Unread Today, 06:53 AM
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I have a friend who lives in a condo high rise at 4500 South Four Mile Run Drive in Arlington, VA. She's on the 11th floor, so height is not an issue, but she's on the south side of the building and obviously most of the DC transmitter are due north of her. With an indoor antenna for her HDTV, she can pick up most of the DC stations, but stability is a problem with 7 and 9. Oddly, we tried a UHF only antenna and it performed a bit better than a rabbit ears UHF loop antenna. I'm guessing that because she's on the side of the building away from the towers she has to pick up her signal from reflection mostly. In fact, probably because it's on the UHF band, she gets better signal strength on 2 out of Baltimore (40 miles further away) than on 7.

Can anyone recommend an indoor antenna that might give us some more stability on 7 and 9?
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post #14084 of 14089 Unread Today, 07:08 AM - Thread Starter
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Originally Posted by carltonrice View Post
I have a friend who lives in a condo high rise at 4500 South Four Mile Run Drive in Arlington, VA. She's on the 11th floor, so height is not an issue, but she's on the south side of the building and obviously most of the DC transmitter are due north of her.
The Brittany? I last serviced their master antenna system back in 1995. The manager's first name was Vera. I thought it was an apartment complex back then. When did it "go condo"?

There is no magic bullet for VHF on the back side of a building, but if their distribution wiring has remained intact, I could make them a nice deal restoring it. As I recall, they had good Baltimore reception as well using cut to channel antennas and ChannelMaster "Jointennas" so if I pump that rooftop signal into their old wiring, all the cable TV subscribing residents would benefit from having all the Baltimore stations available, which are not on their cable system. Hint, hint.

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post #14085 of 14089 Unread Today, 07:22 AM
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Originally Posted by carltonrice View Post
Can anyone recommend an indoor antenna that might give us some more stability on 7 and 9?
Antennas are a buy and try product. I get good reception with both amped and non amped Winegard FlatWave models:

http://www.bestbuy.com/site/winegard...&skuId=2938685

I've not tried the Mohu Leaf:

http://www.bestbuy.com/site/mohu-lea...&skuId=3488006

I recommend placement in a window and always re-scan channels after moving.

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post #14086 of 14089 Unread Today, 08:01 AM
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Reportedly the Winegard Flatwave is better designed for High VHF than the Mohu Leaf. But it is all trial and error, and based upon location. And sometimes an amp helps, sometimes it does more harm than good. You could also try a Terk HDTVa which has basic rabbit ears and a UHF element.
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post #14087 of 14089 Unread Today, 10:28 AM
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Quote:
Originally Posted by AntAltMike View Post
The Brittany? I last serviced their master antenna system back in 1995. The manager's first name was Vera. I thought it was an apartment complex back then. When did it "go condo"?

There is no magic bullet for VHF on the back side of a building, but if their distribution wiring has remained intact, I could make them a nice deal restoring it. As I recall, they had good Baltimore reception as well using cut to channel antennas and ChannelMaster "Jointennas" so if I pump that rooftop signal into their old wiring, all the cable TV subscribing residents would benefit from having all the Baltimore stations available, which are not on their cable system. Hint, hint.
The Brittany is the other building in the complex; she's in the Carlton. I asked her if the building had any antennae on the roof that were being distributed through the building coax and she didn't know, but it may be that the building is using that coax now for cable instead. One day when I'm over there, I'll have to see if there's anything coming out of those coax wall sockets.
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post #14088 of 14089 Unread Today, 10:55 AM
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Most of those high rise apartments in Northern Virginia used to have master antenna systems on the roof that received both DC and Baltimore channels available free of charge to all residents. But that was during the analog days. Don't know how it is now with digital. Or they could have changed to cable or satellite.
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post #14089 of 14089 Unread Today, 11:34 AM - Thread Starter
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Originally Posted by tylerSC View Post
Most of those high rise apartments in Northern Virginia used to have master antenna systems on the roof that received both DC and Baltimore channels available free of charge to all residents. But that was during the analog days. Don't know how it is now with digital. Or they could have changed to cable or satellite.
Most of those were not updated to support the current channel assignments, so even if their headend components are stil working, they will ordinarily get just Washington, DC channels 7 and 9, and possibly Baltimore channels 11 and 13 "natively" and if someone is real lucky, the digital 26.1, which is now on UHF 27 and 50.1, which is still on UHF 50, MIGHT survive the beating they would take in old fashioned analog frequency converters and be tunable.
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