[TechAssist] Re: Hypothetical: When NTSC goes,will we have onestandard ?

  • From: Larry <schntv@xxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Mon, 27 Jun 2005 09:48:28 -0400

As I recall from training many years ago, which may have been
changed by now.
everything is compared to a half wave dipole antenna.
Any gain antenna is getting the gain from restricting the
radiation in some direction and directing it in another.
some antennas restrict the radiation going vertically and
force it to stay near the earth.
if they say it has a 3 DB gain, the signal at a given distance
would be twice as strong as from a dipole antenna.
73
Larry


Damon wrote:
> Yeah, I really don't know why the term is "gain" when you're not really
> gaining additional power from the "ethers".
> 
> All I do understand is that the "Effective Antenna Power"  is affected by
> the "Effective(??) Gain" of the antenna.........
> Our teacher in Antenna/Microwave Cavity training used the term "Effective"
> consistently when talking about Antennas, and termed it as what the antenna
> "looks like" in relations to the Earth, Atmosphere, and recieving
> equipment......
> 
> Remember the old Startup/Shutdown public message broadcast from TV and radio
> stations? They always noted the Channel and Effective Power of that station.
> I remember WOWO transmitting that "50,000" Watts message every hour, but the
> Local TV stations mostly stated their power at the end of the transmission
> day.
> 
> Damon B
> Telrad Electronics
> Fort Wayne IN
> ----- Original Message -----
> From: "J Silverman" <greentron@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, June 25, 2005 12:53 PM
> Subject: [TechAssist] Re: Hypothetical: When NTSC goes,will we have
> onestandard ?
> 
> 
> 
>>Antennas dont really have "gain". There are only so many microwatts that
>>strike the antenna elements and they cant "suck in" any microwatts from
> 
> the
> 
>>space around them. The antenna design determines how many of those
>>microwatts at a given wavelength gets converted into microvolts, and
>>determines the rejection of unwanted signals or noise at other wavelengths
>>and coming from other directions. So with digital signals, the antenna and
>>its installation will be the critical component.
>>Jerry Silverman
>>Greentron Inc
>>4 Newland Ave
>>Greenville SC 29609
>>Fax/Phone 864 232 3889
>>mail to: greentron@xxxxxxx
>>----- Original Message -----
>>From: "Damon" <DamonEB@xxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Saturday, June 25, 2005 7:52 AM
>>Subject: [TechAssist] Re: Hypothetical: When NTSC goes,will we have
>>onestandard ?
>>
>>
>>
>>>Yes, you're correct....digital signals avoid ghosting/multipath
> 
> problems,
> 
>>>and in areas where an analog signal was snowy/grainy they will now
> 
> recieve
> 
>>a
>>
>>>perfectly clear picture, and weaker signal areas will recieve broken up
>>>signal information, or none at all.....
>>>
>>>The rated "Antenna Power" will determine how far the signal is recieved.
>>>The "Tranmitter Power" only determines how much power the the
> 
> transmitter
> 
>>>sends to the antenna......an example is that a 500kW transmitter can
> 
> send
> 
>>>it's signal to a 6-Bay antenna and that 6-Bay antenna will have an
>>>"effective Antenna Power of (6 x 500kW) or 3MW.
>>>That's what I was informed by the NBC affiliate's engineer (Gene) back
> 
> in
> 
>>>the late '80's
>>>
>>>There are other things that affect Antenna power.....antenna gain,
>>
>>effective
>>
>>>height of the antenna, number of antennas......
>>>Still a 440V 3 phase transmitter would require a 100 Amp service to
> 
> drive
> 
>>a
>>
>>>setup like that.
>>>And that 500kw tranmitter at 10 cents a kilowatt/hour would cost $36,000
> 
> a
> 
>>>month.
>>>
>>>Damon B
>>>Telrad Electronics
>>>Fort Wayne IN
>>>----- Original Message -----
>>>From: "Kevin's TV Repair" <kevintv@xxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Saturday, June 25, 2005 1:16 AM
>>>Subject: [TechAssist] Re: Hypothetical: When NTSC goes,will we have
>>>onestandard ?
>>>
>>>
>>>
>>>>So do you need a stronger digital signal than analog signal to give a
>>>>good picture?  I realize that there is a minimum signal required to
> 
> give
> 
>>>>a picture with digital, but I always thought that one of the
> 
> advantages
> 
>>>>of digital was that even a weak signal would give a perfect picture;
>>>>whereas a similar weak analog signal would give a grainy B/W picture.
>>>>
>>>>Just like the hundredth generation copy of a digital VHS tape will
> 
> give
> 
>>>>a perfect picture, but after only the second generation copy an analog
>>>>VHS tape will look terrible.  Does this analogy not apply to the
>>>>broadcast of digital vs. analog signals?
>>>>
>>>>Kevin Wilks
>>>>Kevin's TV Repair
>>>>Penticton BC Canada
>>>>kevintv@xxxxxxx
>>>>
>>>>
>>>>-----Original Message-----
>>>>From: techassist-bounce@xxxxxxxxxxxxx
>>>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jerome Silverman
>>>>Sent: Friday, June 24, 2005 8:25 PM
>>>>To: techassist@xxxxxxxxxxxxx
>>>>Subject: [TechAssist] Re: Hypothetical: When NTSC goes,will we have
>>>>onestandard ?
>>>>
>>>>I cant think of any reason why it should, but with digital you need a
>>>>really
>>>>good signal or you get no picture at all, no snow, no ghosts, no
>>>>grainyness - just no picture!
>>>>Jerry Silverman
>>>>Greentron Inc
>>>>4 Newland Ave Greenville SC 29609
>>>>Fax/Phone 864 232 3889
>>>>greentron@xxxxxxx
>>>>
>>>>----- Original Message -----
>>>>From: "Kevin's TV Repair" <kevintv@xxxxxxx>
>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>Sent: Friday, June 24, 2005 6:10 PM
>>>>Subject: [TechAssist] Re: Hypothetical: When NTSC goes,will we have
>>>>onestandard ?
>>>>
>>>>
>>>>
>>>>>Doesn't digital take a lot less power to transmit?  Their costs may
> 
> be
> 
>>>>>higher, but not much higher (unless they are in California).
>>>>>
>>>>>Kevin Wilks
>>>>>Kevin's TV Repair
>>>>>Penticton BC Canada
>>>>>kevintv@xxxxxxx
>>>>>
>>>>>
>>>>>-----Original Message-----
>>>>>From: techassist-bounce@xxxxxxxxxxxxx
>>>>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Wayne Vanaman
>>>>>Sent: Friday, June 24, 2005 4:51 AM
>>>>>To: techassist@xxxxxxxxxxxxx
>>>>>Subject: [TechAssist] Re: Hypothetical: When NTSC goes,will we have
>>>>>onestandard ?
>>>>>
>>>>>Did they mandate which side of the road we had to drive on?
>>>>>
>>>>>A conversion like this can not be drawn out.  One of the things that
>>>>>surprises me is the lack of support from the TV stations.  While
> 
> they
> 
>>>>>are broadcasting digital and analog their power bills have to be a
> 
> lot
> 
>>>>>higher.  I would think they would want to turn off one of the
>>>>>transmitters.
>>>>>
>>>>>
>>>>>Wayne Vanaman
>>>>>Omega Electronics
>>>>>6904 W Fairfield Dr
>>>>>Pensacola, Fl.  32506-3310
>>>>>
>>>>>Wayne@xxxxxxxxxxxxxxxxxxxxx
>>>>>WWW.PensacolaTVRepair.Com
>>>>>
>>>>>850-456-5995 voice
>>>>>850-458-6369 fax
>>>>>
>>>>>
>>>>>Hoyt's TV wrote:
>>>>>
>>>>>>I have no doubt it looks better and I'm all for it.
>>>>>>I just don't believe it should be shoved down our throats with a
>>>>>
>>>>>deadline.
>>>>>
>>>>>>Did they mandate vinyl had to go away at a predetermined date to
>>>>>
>>>>>facilitate
>>>>>
>>>>>>the change to CDs?
>>>>>>I feel the market should be allowed to work by itself.
>>>>>>
>>>>>>Russ Hoyt
>>>>>>Hoyt's TV
>>>>>>Exeter, NH
>>>>>>
>>>>>
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-- 
Schneider TV & Electronic Inc.
5415 N. Wooster ave.
Dover, Ohio 44622       www.geocities.com/schntv2000/
330-343-0768         FCC. first class & Extra class K8WLY

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