We are having a problem with our over the air reception. During nighttime hours the reception is great, but poor during daylight hours. Is this normal?
Chuck B. wrote: > We are having a problem with our over the air reception. During > nighttime hours the reception is great, but poor during daylight > hours. Is this normal?
Does it get hot where you live? Are you using an old antenna/pre-amp, and/or old/cheap cable for your downlead?
> We are having a problem with our over the air reception. During > nighttime hours the reception is great, but poor during daylight > hours. Is this normal?
I get the same effect, sometime I must get up on the roof and put up a yagi with better, ie reduced rearward lobe/ higher forward lobe responses.
I can not say for sure but there is station that they must change direction of antennas from night to day or wise versa because of signal propagation which interfere with other networks FCC regulation sorry KA2AYS
> Chuck B. <Repl...@Thread.thx> wrote in message > news:g1c184hciccig65h5bup3osqvhjs41eiut@4ax.com... >> We are having a problem with our over the air reception. During >> nighttime hours the reception is great, but poor during daylight >> hours. Is this normal?
> I get the same effect, sometime I must get up on the roof and put up a > yagi > with better, ie reduced rearward lobe/ higher forward lobe responses.
> I cannot say for sure but there is station that they must > change direction of antennas from night to day or vice-versa > because of signal propagation which interfere with other networks
This is plausible (in principle), but at the frequencies at which digital TV operates, there isn't much difference between day and night propagation.
On Sat, 19 Jul 2008 13:56:43 +0000, New Jersey wrote: > I can not say for sure but there is station that they must > change direction of antennas from night to day or wise versa > because of signal propagation which interfere with other networks > FCC regulation sorry KA2AYS
That only applies to AM radio stations.
All TV stations (analog and digital) are licensed for the same technical facilities 24/7.
I wonder if the OP's problems stem from interference from some device that's only operated during the day? (say, neon lights at a nearby store? Or a factory with large motors?)
Does *analog* reception change from day to night - do you get snowy daytime reception, or funny patterns, etc., etc.?
<w...@invalid.nospam> wrote: >On Sat, 19 Jul 2008 13:56:43 +0000, New Jersey wrote: >> I can not say for sure but there is station that they must >> change direction of antennas from night to day or wise versa >> because of signal propagation which interfere with other networks >> FCC regulation sorry KA2AYS
>That only applies to AM radio stations.
>All TV stations (analog and digital) are licensed for the same technical >facilities 24/7.
>I wonder if the OP's problems stem from interference from some device >that's only operated during the day? (say, neon lights at a nearby store? > Or a factory with large motors?)
>Does *analog* reception change from day to night - do you get snowy >daytime reception, or funny patterns, etc., etc.?
I have only been receiving digital tv for a few days. It has been very hot and humid here, could that be causing the problem? As for analog reception, it works well day and night. I use the same Channel Master roof top UHF/VHF antenna and coax cable for analog and digital. FWIW the stations I am trying to receive are in Indianapolis and I am in Bloomington IN.
>I have only been receiving digital tv for a few days. It has been >very hot and humid here, could that be causing the problem?
Water infiltration into a coax cable can cause signal loss. I suppose it's possible you've gotten rainwater into the coax (due to inadequate sealing of the F connector on the end) and that high temperatures change how the moisture affects signal attenuation.
> As for >analog reception, it works well day and night.
Hmmm. That would see to rule out simple temperature change or signal strength, then.
> I use the same Channel >Master roof top UHF/VHF antenna and coax cable for analog and digital. >FWIW the stations I am trying to receive are in Indianapolis and I am >in Bloomington IN.
ATSC digital signals are relatively sensitive to multipath (the same phenomenon which generates "ghost" images on analog TV). Possibly there's more multipath being generated in your area during the day, as a result of (for example):
- More airplanes flying through the "field of view" between you and the transmitter
- More wind, causing tree branches and leaves to move around nearby
- More surface vehicles (trucks, ships) travelling nearby
The idea that there might also be a locally-generated source of interference which is more active during the day is also a good one. Are you seeing "sparkles" on the weaker analog channels (from impulse noise), or "herringbone", or something like that?
-- Dave Platt <dpl...@radagast.org> AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads!
On 7/19/08 7:50 AM, in article ds-dnT7KgPfzYhzVnZ2dnUVZ_sPin...@comcast.com,
"William Sommerwerck" <grizzledgee...@comcast.net> wrote: > "New Jersey" <t.se...@verizon.net> wrote in message > news:vomgk.87$oU.8@trnddc07... >> I cannot say for sure but there is station that they must >> change direction of antennas from night to day or vice-versa >> because of signal propagation which interfere with other networks
> This is plausible (in principle), but at the frequencies at which digital TV > operates, there isn't much difference between day and night propagation.
Ducting affects signals in the TV spectrum much more at night than at daytime.
> On Sat, 19 Jul 2008 13:56:43 +0000, New Jersey wrote: >> I can not say for sure but there is station that they must >> change direction of antennas from night to day or wise versa >> because of signal propagation which interfere with other networks >> FCC regulation sorry KA2AYS
> That only applies to AM radio stations.
Not change the direction of the antennas but go from 50,000 watts to 5 watts.
> All TV stations (analog and digital) are licensed for the same technical > facilities 24/7.
> I wonder if the OP's problems stem from interference from some device > that's only operated during the day? (say, neon lights at a nearby store? > Or a factory with large motors?)
> Does *analog* reception change from day to night - do you get snowy > daytime reception, or funny patterns, etc., etc.?
On Sat, 19 Jul 2008 13:06:21 -0400, Chuck B. wrote: > I have only been receiving digital tv for a few days. It has been > very hot and humid here, could that be causing the problem? As for > analog reception, it works well day and night. I use the same Channel > Master roof top UHF/VHF antenna and coax cable for analog and digital. > FWIW the stations I am trying to receive are in Indianapolis and I am > in Bloomington IN.
As Dave suggests, take a careful look at your analog reception. Especially the weaker stations - channel 29? channel 49? The appearance of any interference on analog reception is a clue to the nature of what might be affecting the digital.
Are *all* digital stations affected or only some of them? (channel 8's digital is on a very different frequency from the other Indianapolis stations)
Do you have a preamp on your antenna? Outside? Do neighbors have preamps? We once had an interference problem in a small town when someone's preamp malfunctioned & began acting as a small transmitter. It was thermally-related - would only malfunction when it was cold. (i.e., at night...)
