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Search: Posts Made By: thom
Forum: Enthusiast's Exchange 9-Feb-2013, 8:34 PM
Replies: 2
Views: 4,779
Posted By thom
4nec2

Thank you for the prompt response and links. I hadn't realized 4NEC2 was actually free. Looks like it's has enough capability to keep me busy for a long while, but will no doubt save many trips up...
Forum: Enthusiast's Exchange 9-Feb-2013, 5:39 PM
Replies: 2
Views: 4,779
Posted By thom
accounting for outer diameter

Hi All,

So I understand that the outer diameter of a dipole affects its bandwidth (more diameter, more bandwidth), but it also affects the resonant length of the dipole. Is there an equation for...
Forum: Antennas 20-Oct-2012, 5:31 AM
Replies: 0
Views: 2,375
Posted By thom
VHF dipole cross

Wondering if a VHF dipole cross is a viable design. To explain, a dipole has a front/back reception pattern with nulls at +/- 90 degrees from boresight. If you had two dipoles, one oriented 90...
Forum: Help With Reception 30-Sep-2012, 5:45 AM
Replies: 6
Views: 3,067
Posted By thom
bag of signal strength

Found an unconventional way to get my signal strength on the roof...

In the end, I decided (of my available options) the Tivo had the best signal metering, so I needed to get that up on the roof,...
Forum: Help With Reception 7-Sep-2012, 2:18 PM
Replies: 11
Views: 9,040
Posted By thom
I realize you're being mostly facetious, but...

I realize you're being mostly facetious, but apart from the cost, that would still require FCC clearance as well as clearance from the individual broadcasters and networks, right?

(they weren't...
Forum: Help With Reception 7-Sep-2012, 5:57 AM
Replies: 20
Views: 11,321
Posted By thom
Well, sure, its stated purpose is to divide the...

Well, sure, its stated purpose is to divide the signal, but there is no division without degradation. The first definition in Websters for degradation is 'to reduce'. In the context of the...
Forum: Help With Reception 7-Sep-2012, 5:21 AM
Replies: 10
Views: 2,278
Posted By thom
I'm not a fan of rotators, but I think your...

I'm not a fan of rotators, but I think your situation demands it. I'd suggest a Winegard 8200U, a CPA19 preamp, and a rotator. You could try the first two without the rotator and assess your...
Forum: Help With Reception 6-Sep-2012, 4:01 PM
Replies: 20
Views: 11,321
Posted By thom
Understand it's the splitter's job to degrade...

Understand it's the splitter's job to degrade your signal. It's going to cut the output signal in half (half goes to one output, half to the other). There's also inefficiency in the splitter...
Forum: Help With Reception 6-Sep-2012, 3:08 PM
Replies: 3
Views: 1,902
Posted By thom
how close is the fan to the antenna?

how close is the fan to the antenna?
Forum: Help With Reception 6-Sep-2012, 2:26 PM
Replies: 10
Views: 2,278
Posted By thom
"raised the house 50 inches?" If you look at...

"raised the house 50 inches?"

If you look at the terrain profile, you can see you might benefit more significantly from more antenna height....
Forum: Help With Reception 6-Sep-2012, 2:19 PM
Replies: 11
Views: 9,040
Posted By thom
Some 2Edges are worse than others. Take a look...

Some 2Edges are worse than others. Take a look at this
http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3de77953f4f76863%26t%3dALLTV%26n%3d16

You're in deep shadow, so things are not...
Forum: Help With Reception 5-Sep-2012, 5:27 AM
Replies: 20
Views: 11,321
Posted By thom
http://www.antennasdirect.com/cmss_files/attachmen...

http://www.antennasdirect.com/cmss_files/attachmentlibrary/DB4E-TDS.pdf

The DB4e is lightweight and comparatively small. It tends to act like a VHF antenna on the sides, but especially for the...
Forum: Help With Reception 3-Sep-2012, 1:30 AM
Replies: 5
Views: 2,694
Posted By thom
The reason I asked about the power supply...

The reason I asked about the power supply (amplifier) is this: http://www.amazon.com/review/R19573DIBLCDH4/ref=cm_cr_dp_title?ie=UTF8&ASIN=B001VYTCDK&nodeID=172282&store=electronics
(last paragraph)...
Forum: Help With Reception 3-Sep-2012, 12:12 AM
Replies: 5
Views: 2,694
Posted By thom
11 and 13 are significantly weaker and on a...

11 and 13 are significantly weaker and on a different heading) than the other VHF channels you do get. I don't think the antenna will pull VHF as well as it does UHF.

The report also shows your...
Forum: Help With Reception 2-Sep-2012, 3:59 PM
Replies: 17
Views: 4,307
Posted By thom
if you have a cooperative partner, the simplest...

if you have a cooperative partner, the simplest thing to do is to have them watch the signal strengths (and shout them up to the attic) for KTVT and KXAS as you make small changes to the antenna...
Forum: Help With Reception 2-Sep-2012, 6:37 AM
Replies: 17
Views: 4,307
Posted By thom
What's your roof made out of? How many...

What's your roof made out of?

How many stations are you getting altogether?

How long are the cable runs from the splitters?
Forum: Antennas 1-Sep-2012, 6:34 PM
Replies: 18
Views: 29,141
Posted By thom
Thanks, makes sense. So I should be able to...

Thanks, makes sense.

So I should be able to measure the impedance on the notional DB8e with multimeter contacts on the points where the balun/transformer would attach?

(and likewise with a...
Forum: Help With Reception 1-Sep-2012, 4:46 PM
Replies: 6
Views: 3,666
Posted By thom
"indoor long-range antenna" is an oxymoron. ...

"indoor long-range antenna" is an oxymoron.

However, you are in fine circumstances. You have many powerful stations close by on one heading.

If you want something simple and don't want to mess...
Forum: Antennas 1-Sep-2012, 3:17 PM
Replies: 18
Views: 29,141
Posted By thom
No kidding, a TV-2900 would do the job? By...

No kidding, a TV-2900 would do the job?

By 'matching impedances' do you mean between the two antennas? How does one go about that?
Forum: Help With Reception 1-Sep-2012, 1:12 PM
Replies: 11
Views: 6,039
Posted By thom
There are. Channels 9 and 11.

There are. Channels 9 and 11.
Forum: Help With Reception 1-Sep-2012, 5:32 AM
Replies: 11
Views: 6,039
Posted By thom
KDKA is doable if you want it badly enough. ...

KDKA is doable if you want it badly enough. You're going to need an UHF antenna with about 13db of gain, though. If you want 11 and 9 as well, you'll need a VHF combo. You'll want to point the...
Forum: Antennas 1-Sep-2012, 1:25 AM
Replies: 18
Views: 29,141
Posted By thom
So if I read you right, to get a bona fide DB8e,...

So if I read you right, to get a bona fide DB8e, I need to pull off the baluns, put the DB4e's side by side and tie them together with lateral transmissions lines of equal length, and put a balun in...
Forum: Help With Reception 31-Aug-2012, 9:17 PM
Replies: 6
Views: 1,565
Posted By thom
lol, you're in what TV heaven looks like. ...

lol, you're in what TV heaven looks like.

Can you explain what you mean by "Limited on placement of an antenna on roof"?

Would you prefer a smaller, lighter antenna (i.e. simplified mounting),...
Forum: Help With Reception 31-Aug-2012, 8:03 PM
Replies: 6
Views: 1,565
Posted By thom
bad url. try it again

bad url. try it again
Forum: Help With Reception 31-Aug-2012, 3:14 PM
Replies: 12
Views: 25,042
Posted By thom
if you can't unscrew it from the antenna, you can...

if you can't unscrew it from the antenna, you can get another length of cable and a F/F connector like this one to tie them together:
http://www.amazon.com/F-Pin-Coupler-Female/dp/B000I991LM
...
Showing results 1 to 25 of 67

 

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