I do not see what a stroll down memory lane has to do with DTV. One has
to think differently.
On 7/7/12 2:39 AM, Roger (K8RI) wrote:
> On 7/6/2012 10:17 PM, W2XJ wrote:
>> To a degree, yes. It is that the newer DTV tuner chips perform better
>> under multipath conditions where NTSC was very sensitive to ghosts and
>> required a very directional antenna. With DTV, scanning does not work
>> that well when there are stations in multiple directions. In such cases
>> an omni antenna is required. When the transmitters are in one general
>> direction but not exactly in the same location, a vertically stacked
>> bowtie is best. DTV requires re-thinking what we have accepted as VHF
>> and UHF propagation.
> My experience is an antenna is an antenna is an antenna is an antenna.
> It makes no difference in the antenna type, they do not care whether the
> signal is analog or digital.
>
> there is no such thing as a digital or analog antenna, nor is there one
> that works better on digital or analog Vs the other
> Nor have I ever noticed a difference in types versus modes.
>
> I use very long Yagi antennas I did have two, one to the SSE and one to
> the NW. http://www.rogerhalstead.com/ham_files/tower39.htm only shows
> the one pointed to the SSE.
>
> Although it specifically a UHF antenna it worked well across the entire
> UHF spectrum. With the antenna mounted preamps they worked equally well
> on VHF from CH 2 through 13 although not very directional, but reception
> was good out to around 60 miles or more. At 90 miles you couldn't tell
> the difference between that station and a local BTW although the gain
> fell off they did well up to 60 degrees off the main axis. On axis with
> the one to the NW I could receiver Traverse city which is over 110 miles.
>
> The bow tie has been popular for two reasons. It is very broad band and
> it is *cheap*! It is rare to do weak signal work on UHF because the
> horizon + 13% is so close the signal is either strong or not there.
> Even the Radio Shack long Yagis work just fine across the entire UHF
> spectrum. When both Yagis were up I could get over 22 stations like
> they wee local. I could get Kalamazoo and GrandRapids if I swung the
> antenna 45 degrees to the SW.
>
> I did at one time have a quadrature array of them up but concluded they
> were just not worth the effort and I'd much rather have a big ham
> antenna up there. http://www.rogerhalstead.com/ham_files/tower21.htm
>
> Noise is a fact of life with Analog regardless of frequency, it just
> isn't as strong in the UHF range. I used to get both Ch 2 and Ch 50
> analog out of Detroit. That is until that religious station on channel
> 49 one came on one week after I put up a winegard dish. 50 came in
> great. A week later I could not find it because 49 was in a direct line
> with 50. They told me, you can't get 50 up there. I told them that was
> true now, but it wasn't a week ago. It didn't matter as I was too far
> out on their maps.
>
> Antennas for low and high VHF were Broadband by design. They were
> really two antennas in one. In the early days they made a lot of
> monobanders...Ie for specific channels.
>
>
>>
>> On 7/6/12 10:09 PM, Eric Lowell wrote:
>>> I'm sure that you don't mean to imply that the operation of the antenna
>>> is dependent on the type of modulation?
>>>
>>> Do you?
>>>
>>> Best Regards, Eric
>>> On 7/6/2012 9:52 PM, W2XJ wrote:
>>>> That is not entirely correct. A 'digital' antenna is generally one that
>>>> is either omni or has a wide beamwidth. A bowtie is a 'digital' antenna.
>>>> Yagis and logs do not usually work so well. Unfortunately, a lot of this
>>>> depends on the skill set of the end user. With a typical consumer those
>>>> skills are nonexistent which mean a lot of confusion.
>>>>
>>>>
>>>> On 7/6/12 1:53 PM, Robert Morris wrote:
>>>>> On Jul 6, 2012, at 1:03 PM, Jim Brown wrote:
>>>>>
>>>>> On 7/6/2012 11:13 AM, Jerry Kaidor wrote:
>>>>>> Need a little advice here.
>>>>> I get excellent results from an old standby 4x2 bow-tie with reflector.
>>>>>
>>>>> And if you go to Radio Shack, the kid will tell you need a digital
>>>>> antenna, just like when you needed the special one for
>>>>> color RF.
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>
>
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